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Detailed Guidance on How to Properly Disassembly Components
1) Disassembly Of Fuel Lines For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Fuel lines are a critical part of the engine, and improper handling can lead to fuel spills, potential fire hazards, or injury from high-pressure fuel spray. Disassembling fuel lines requires extra caution and proper technique to avoid damaging sensitive components.
2) Disassembly Of Exhaust Manifold For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The exhaust manifold is responsible for collecting exhaust gases from the engine’s cylinders and directing them into the exhaust system. During disassembly, care must be taken to prevent damage to the manifold or cylinder head, as well as to avoid exposure to heat and harmful fumes.
3) Disassembly Turbocharger (If Equipped) For Detroit Diesel 71 Series Inline Engines (471, 671)
The turbocharger is a high-performance component that boosts engine power by increasing the amount of air entering the combustion chamber. Turbochargers are delicate and can be damaged easily during disassembly if not handled properly. The removal process must be carried out with care to avoid damage to the impeller, bearings, or housing, which are critical to the turbo’s performance.
4) Disassembly Of Throttle Controls For Detroit Diesel 71 Series Inline Engine (271, 371, 471, 671)
The throttle controls are an essential part of the engine’s operation, regulating the amount of fuel and air that enters the combustion chamber. Disassembling the throttle controls must be done carefully to avoid damage to sensitive linkages, springs, and cables. Proper removal is necessary during engine overhauls or when servicing the throttle components.
5) Disassembling The Starting Motor, Battery-Charging Generator, and Electrical Equipment For Series 71 Inline Engines (271, 371, 471, 671)
The starting motor, battery-charging generator (alternator), and electrical equipment are essential components that require careful disassembly to avoid damage and ensure safe handling of electrical systems. Here’s a detailed guide for safely removing and inspecting these components from the Detroit Diesel Series 71 engine.
The air compressor on the Detroit Diesel Series 71 engine is commonly used to supply compressed air for pneumatic systems such as air brakes or other accessories. Proper disassembly is critical to prevent damage to the compressor and ensure safety, especially when dealing with pressurized systems.
7) Disassembly Of Radiator and Fan Guard or Heat Exchanger For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The radiator, fan guard, and heat exchanger play crucial roles in maintaining the engine’s cooling system. These components must be removed carefully during maintenance or engine disassembly to prevent damage to the cooling system and ensure proper reassembly later. The radiator dissipates heat from the coolant, while the heat exchanger performs a similar role, particularly in marine applications.
9)Disassembly Of Air Box Covers For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The air box covers on the Detroit Diesel Series 71 engine are essential for managing airflow into the engine and keeping debris out of the air box passages. Removing these covers is necessary when performing deeper maintenance on the engine’s air system, blower, or cylinders. Proper disassembly ensures the air box passages remain clean and free from contaminants.
10) Disassembly Of Cylinder Head and Valves For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The cylinder head is one of the most critical components in the engine. It houses the valves and, in some cases, the injectors, and is responsible for controlling air intake, exhaust gases, and combustion pressure. Proper disassembly of the cylinder head and valves is essential for routine maintenance, repairs, or a full overhaul. This procedure must be done carefully to avoid damaging the head, valves, or block.
11) Disassembly Of Governor Control Assembly For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The governor control assembly regulates engine speed by managing the throttle and fuel delivery to maintain consistent RPMs. Proper disassembly of this component is essential for maintenance, troubleshooting, or overhaul of the engine’s governor system. Careful handling of the governor and its linkages is critical to avoid misalignment or damage to the assembly.
12) Disassembly Of The Water Pump and Coolant System Components (Freshwater and Raw Water Pumps) For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
In the Detroit Diesel Series 71 engine, the coolant system consists of two main types of pumps in marine applications: the freshwater pump and the raw water pump. The freshwater pump circulates coolant through the engine block, while the raw water pump brings seawater or external water to cool the engine’s heat exchanger or intercooler. Proper disassembly and maintenance of both pumps are crucial to ensure efficient engine cooling, especially in marine environments.
13) Disassembly Of The Blower For Detroit Diesel 71 Series Inline Engine (271, 371, 471, 671)
The blower plays a key role in the two-stroke cycle of the Detroit Diesel Series 71 engine by supplying air for combustion. Proper disassembly of the blower is essential for maintenance, repairs, or overhaul. Care must be taken to avoid damaging the blower housing, rotors, or drive system, which are critical for efficient engine operation.
The blower drive gear and support assembly are responsible for driving the blower, ensuring that the proper amount of air is delivered to the engine for combustion. The drive gear and support must be carefully disassembled and inspected to maintain the efficiency and reliability of the engine’s air system. Disassembling this component involves working with precision gears, so care must be taken to prevent damage to the gear teeth and the support structure.
15) Disassembly Of The Camshaft and Balance Shaft For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The camshaft and balance shaft are essential components for the proper timing and smooth operation of the Detroit Diesel Series 71 engine. The camshaft controls the opening and closing of the valves, while the balance shaft helps reduce engine vibrations. Proper disassembly of these components is crucial during maintenance, overhaul, or replacement. Careful handling of the camshaft and balance shaft is necessary to prevent damage to the lobes, bearings, or timing mechanism.
16) Disassembly Of Flywheel and Flywheel Housing For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The flywheel and flywheel housing are critical for the smooth operation of the Detroit Diesel Series 71 engine. The flywheel stores rotational energy and provides inertia to help maintain engine momentum, while the flywheel housing encloses and protects the flywheel assembly. Proper disassembly of these components is important during engine overhauls, clutch replacements, or other major maintenance procedures.
17) Disassembly Of The Oil System Components For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The oil system in the Detroit Diesel Series 71 engine plays a critical role in lubricating, cooling, and cleaning the engine’s moving parts. The key components of the oil system include the oil pump, oil cooler, oil filter housing, and various lines and fittings. Proper disassembly of these components is essential for maintenance, overhaul, or troubleshooting oil system issues such as leaks or low oil pressure.
18)Disassembly Of Cylinder Block End Plates For Detroit Diesel 71 Series Inline Engine (271, 371, 471, 671)
The cylinder block end plates are important components that seal the ends of the cylinder block, ensuring the integrity of the engine’s cooling and lubrication systems. Proper removal, inspection, and reinstallation of these plates are essential during engine overhauls or when addressing coolant or oil leaks. The end plates are often subjected to heat and pressure, making them susceptible to wear, warping, or corrosion over time.
19) Disassembly Of Air Box Drains For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The air box drains in the Detroit Diesel Series 71 engine serve the critical function of draining excess oil, fuel, and moisture from the air box area to prevent these fluids from entering the combustion chambers. Maintaining and cleaning the air box drains is essential to ensure efficient engine operation, prevent engine damage, and improve overall performance. Regular inspection and maintenance of these components help avoid contamination of the air system.
20) Disassembly Of Engine Lifter Brackets For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The engine lifter brackets are used to safely lift and support the Detroit Diesel Series 71 engine during removal, installation, or maintenance operations. These brackets are designed to provide secure mounting points for lifting equipment, such as hoists or cranes. Regular inspection and proper use of these brackets are essential to ensure the safety and stability of the engine during lifting.
21) Removing The Valve Rocker Cover On A Detroit Diesel 71 Series Inline Engine
The valve rocker cover protects the valve train components, including the rocker arms, pushrods, and valves, from external contaminants while also containing the oil that lubricates these moving parts. Proper removal, inspection, and reinstallation of the valve rocker cover are essential to prevent oil leaks and ensure the smooth operation of the engine’s valve train. Routine maintenance of this component is important, especially if there are signs of oil leaks or other engine performance issues.
To Find Rocker Covers & Reinstallation Parts For Your 71 Series Inline Engine Use The Links Below:
-
- Detroit Diesel 271 Cylinder Head & Components Including Valve Cover & Installation Kit
- Detroit Diesel 371 Cylinder Head & Components Including Valve Cover & Installation Kit – Non Turbo (2-Valve)
- Detroit Diesel 371 Cylinder Head & Components Including Valve Cover & Installation Kit – Non Turbo (4-Valve)
- Detroit Diesel 471 Cylinder Head & Components Including Valve Cover & Kit – Non Turbo (2-Valve)
- Detroit Diesel 471 Cylinder Head & Components Including Valve Cover & Installation Kit -Non Turbo (4-Valve)
- Detroit Diesel 471 Cylinder Head & Components Including Valve Cover & Installation Kit – Turbo
- Detroit Diesel 671 Cylinder Head & Components Including Valve Cover & Kit – Non Turbo (2-Valve)
- Detroit Diesel 671 Cylinder Head & Components Including Valve Cover & Kit -Non Turbo (4-Valve)
- Detroit Diesel 671 Cylinder Head & Components Including Valve Cover & Kit – Turbo
22) Disassembly Of Turbochargers For Detroit Diesel 71 Series Inline Engines – ( 471, 671)
The turbocharger is a critical component in boosting engine performance by forcing more air into the engine’s combustion chambers, increasing power output. Proper disassembly, inspection, and reassembly of the turbocharger are essential to maintain optimal engine performance and prevent damage to this high-performance part. Turbochargers are sensitive components, and improper handling can lead to damage of the impeller, bearings, or seals.
23) Air Cleaner Disassembly For 71 Series Inline Engines (271, 371, 471, 671)
The air cleaner is an essential component of the engine’s air intake system, designed to filter out dirt, dust, and other contaminants from the air before it enters the engine. Proper maintenance of the air cleaner is crucial to prevent debris from entering the combustion chamber, which can cause damage and reduce engine performance. Regular inspection, cleaning, or replacement of the air cleaner ensures that the engine receives clean air, improving fuel efficiency and extending engine life.
24) Air Shutdown Housing Disassembly For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The air shutdown system is a critical safety feature on diesel engines that allows for an emergency shutdown by cutting off the air supply to the engine. This system is often used in situations where fuel shutoff alone is not enough to stop the engine, such as in runaway conditions. The air shutdown housing encloses the components of this system, and its proper maintenance ensures that the shutdown function works reliably when needed.
Detailed Guidance on How to Properly Reassemble Components For Series 71 Inline Engines (271, 371, 471, 671)
Proper reassembly is critical to ensuring the long-term performance and reliability of the Detroit Diesel Series 71 engine. Each component must be handled with care, thoroughly cleaned, inspected, and assembled according to manufacturer specifications to avoid issues such as leaks, improper seating, or part failure.
1. Cleanliness and Preparation
- Ensure a Clean Work Area
- Thoroughly Clean All Parts
- Use Lint-Free Cloths
- Organize Parts
2. Component Inspection
Before reassembling, inspect every component carefully:
- Inspect Sealing Surfaces
- Check for Wear or Damage
- Test Moving Parts
- Replace Old Gaskets and Seals
3. Reassembling Fuel Lines
- Ensure Fuel System Cleanliness
- Align Fuel Lines Properly
- Tighten the Fittings Securely
- Test for Leaks
4. Reinstalling the Exhaust Manifold
-
- Clean the Exhaust Ports
- Install New Gaskets
- Tighten the Bolts Evenly
- Check for Exhaust Leaks
5. Reassembling the Cylinder Head
- Clean and Inspect the Cylinder Head
- Install New Head Gasket
- Reinstall the Cylinder Head
- Adjust Valve Clearance
- Check for Coolant and Oil Leaks
Torque Specs For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
The Importance of Following Torque Specifications
Adhering to the correct torque specifications is crucial when reassembling the Detroit Diesel 71 Series engines. Overtightening or undertightening fasteners can lead to mechanical failure, engine damage, or leakage. Every fastener used in these engines must be tightened to the manufacturer’s recommended values to ensure a safe and efficient assembly.
Use a Torque Wrench
Follow Manufacturer’s Guidelines
Tighten in Stages
Comprehensive Torque Specifications:
Detroit Diesel 2-71 Torque Specifications |
|||
|
Thread Size (in.)
|
Description
|
Torque Specifications | |
| lb-ft | N-m | ||
| 1/4-20 | Standard Torque Specification | 7-9 | 9-12 |
|
1/4-28
|
Standard Torque Specification | 8-10 | 11-14 |
| Screw-Injector Rack Control Lever | 2-3 | 3-4 | |
| 5/16-18 | Standard Torque Specification | 13-17 | 18-23 |
|
5/16-24
|
Standard Torque Specification | 15-19 | 20-26 |
| Nut-Lock-Push Rod | 15-19 | 20-26 | |
|
3/8-16
|
Standard Torque Specification | 30-35 | 41-47 |
| Bolt-Air Inlet Housing to Blower | 30-35 | 41-47 | |
| Bolt-Air Box Cover | 10-12 | 14-16 | |
| Bolt-Oil Pan | 10-12 | 14-16 | |
| Bolt-Injector Clamp | 20-25 | 27-34 | |
|
3/8-24
|
Standard Torque Specification | 35-39 | 47-53 |
| Nut-Fuel Jumper Line | 12-16 | 16-22 | |
| Nut-Exhaust Outlet Manifold Flange (Brass) | 20-25 | 27-34 | |
| Nut-Injector Clamp | 20-25 | 27-34 | |
|
7/16-14
|
Standard Torque Specification | 46-50 | 62-68 |
| Bolt-Blower to Block | 55-60 | 75-81 | |
|
7/16-20
|
Standard Torque Specification | 57-61 | 77-83 |
| Bolt-Oil Strainer Shell to Adaptor | 30-35 | 41-47 | |
| Bolt-Connecting Rod to Pin | 55-60 | 75-81 | |
| Nut-Connecting Rod | 60-75 | 81-102 | |
| Nut-Connecting Rod | 60-75 | 81-95 | |
|
1/2-13
|
Standard Torque Specification | 71-75 | 96-102 |
| Bolt-Rocker Shaft Bracket to Cyl Head | 90-100 | 122-136 | |
| 1/2-20 | Standard Torque Specification | 83-93 | 113-126 |
| 9/16-12 | Standard Torque Specification | 90-100 | 122-136 |
|
9/16-18
|
Standard Torque Specification | 107-117 | 145-159 |
| Bolt-Flywheel | 180-190 | 244-258 | |
|
5/8-11
|
Standard Torque Specification | 137-147 | 186-199 |
| Bolt-Main Bearing (Boring) | 165-175 | 224-237 | |
| Bolt-Main Bearing (Assembly) | 180-190 | 244-258 | |
| Bolt-Cylinder Head | 190-200 | 258-271 | |
|
5/8-18
|
Standard Torque Specification | 168-178 | 228-241 |
| Nut-Special Self Locking Nut (10SI Alternator) | 40-60 | 54-81 | |
| Bolt-Lube Oil Filter Center | 50-60 | 68-81 | |
| Nut-Alternator Pulley | 70-80 | 95-108 | |
| 3/4-18 | Nut-Standard, Dipstick Tube | 30-35 | 41-47 |
| 3/4-16 | Standard Torque Specification | 290-300 | 393-407 |
| 7/8-14 | Standard Torque Specification | 475-485 | 644-658 |
| 1-14 | Bolt-Crankshaft End (1) | 290-310 | 393-420 |
| 1-14 | Bolt-Crankshaft End-1-1/2 Hex Head (2) | 440-460 | 597-624 |
| 1-20 | Nut-Cam and Balance Shaft | 250-275 | 339-373 |
Detroit Diesel 2-71 Pipe Plug Torque Specifications |
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|
Plug Size (in.)
|
Description
|
Torque Specifications | |
| lb-ft | N-m | ||
| 1/8-27 | Plug-Pipe (3/4 Taper) | 10-12 | 14-16 |
| 1/4-18 | Plug-Pipe (3/4 Taper) | 14-16 | 19-22 |
| 1/4-18 | Plug-Pipe (7/8 Taper) | 14-16 | 19-22 |
| 3/8-18 | Plug-Pipe (3/4 Taper) | 18-22 | 24-30 |
| 3/8-18 | Plug-Pipe (7/8 Taper) | 18-22 | 24-30 |
| 1/2-14 | Plug-Pipe (3/4 Taper) | 23-27 | 31-37 |
| 1/2-14 | Plug-Pipe (7/8 Taper) | 23-27 | 31-37 |
| 3/4-14 | Plug-Pipe (3/4 Taper) | 33-37 | 45-50 |
| 3/4-14 | Plug-Pipe (7/8 Taper) | 33-37 | 45-50 |
| 1-11 1/2 | Plug-Pipe (3/4 Taper) | 75-85 | 102-115 |
| 1-11 1/2 | Plug-Pipe (7/8 Taper) | 75-85 | 102-115 |
| 1 1/4-11 1/2 | Plug-Pipe (3/4 Taper) | 95-105 | 129-142 |
| 1 1/2-11 1/2 | Plug-Pipe (3/4 Taper) | 110-130 | 149-176 |
| 1 1/2-11 1/2 | Plug-Pipe (7/8 Taper) | 110-130 | 149-176 |
| 1/2-20 | Plug-Fuel Pump Relief Valve | 18-22 | 24-30 |
Detroit Diesel 2-71 Stud Torque Specifications |
|||
|
Thread Size (in.)
|
Description
|
Torque Specifications | |
| lb-ft | N-m | ||
| 7/16-20 | Stud Standard | 30-35 | 41-47 |
Torque Specifications For Detroit Diesel Series 71 (Inline Except 2 Cylinder) |
|||
|
Thread Size (in.)
|
Description
|
Torque Specifications | |
| lb-ft | N-m | ||
|
1/4-20
|
Standard Torque Specification | 7-9 | 9-12 |
| Bolt-Injector Control Shaft Bracket | 10-12 | 14-16 | |
| Bolt-Cam Follower Guide | 12-16 | 16-22 | |
|
1/4-28
|
Standard Torque Specification | 96-120 | 130-163 |
| Screw-Inj. Rack Control Lever | 24-36 | 33-49 | |
|
5/16-18
|
Standard Torque Specification | 156-204 | 212-277 |
| Bolt-Oil Pan (Cast) – Hard Gasket | 13-21 | 18-28 | |
| Bolt-Oil Pan (Low Pan or In Aluminum F/W Hsg. & Front Cover) | 10-12 | 14-16 | |
|
5/16-24
|
Standard Torque Specification | 15-19 | 20-26 |
| Nut-Lock-Push Rod | 15-19 | 20-26 | |
| Bolt-Blower Drive Coupling Rotor Gear | 20-25 | 27-34 | |
| Bolt-Blower Rotor Gear Hub | 25-30 | 34-41 | |
| Nut-Lock Valve Bridge Adj. Screw | 20-25 | 27-34 | |
|
7/16-14
|
Standard Torque Specification | 46-50 | 62-68 |
| Bolt-Tach. Drive | 30-35 | 41-47 | |
| Bolt-Lifter Bracket | 55-60 | 75-81 | |
| Bolt-Valve Bridge Guide (Nylon-Insert) | 46-50 | 62-68 | |
| Bolt-Flywheel Housing Large Hole Cover | 30-35 | 41-47 | |
| Bolt-Blower to Block | 55-60 | 75-81 | |
|
7/16-20
|
Standard Torque Specification | 57-61 | 77-83 |
| Connector-Fuel (Steel Washer) | 40-45 | 54-61 | |
| Nut-Exhaust Manifold | 30-35 | 41-47 | |
| Nut-Connecting Rod | 60-70 | 81-95 | |
| Connector- Fuel (Nylon Insert) | 30-35 | 41-47 | |
| Nut-Connecting Rod | 60-70 | 81-95 | |
| Bolt-Connecting Rod to Pin | 55-60 | 75-81 | |
|
3/8-16
|
Standard Torque Specification | 30-35 | 41-47 |
| Bolt-Camshaft & Seal End Bearing | 35-40 | 47-54 | |
| Bolt-Flywheel Hsg to Idler Gear & Dummy | 40-45 | 54-61 | |
| Bolt-Air Box Cover | 10-15 | 14-20 | |
| Bolt-Rocker Cover Hold-Down Special 12-Point | 15-20 | 20-27 | |
| Bolt-Injector Clamp | 20-25 | 27-34 | |
| Bolt-Oil Pan | 10-20 | 14-27 | |
|
3/8-24
|
Standard Torque Specification | 35-39 | 47-53 |
| Bolt-Accessory Drive to Balance Gear (Steel Disc) | 45-50 | 61-68 | |
| Bolt-Lower Front Cover | 25-30 | 34-41 | |
| Nut-Water Manifold | 20-25 | 27-34 | |
| Bolt-Balance Weight to Hub | 25-30 | 34-41 | |
| Bolt-Balance Weight to Timing Gear | 25-30 | 34-41 | |
| Bolt & Nut-Blower Drive Gear | 25-30 | 34-41 | |
| Nut-Exhaust Outlet Manifold Flange | 20-25 | 27-34 | |
| Nut-Fuel Jumper Line O Ring | 13-17 | 18-23 | |
| Nut-Fuel Jumper Line Flared | 11-13 | 15-18 | |
| Nut-Injector Clamp | 20-25 | 27-34 | |
|
1/2-13
|
Standard Torque Specification | 71-75 | 96-102 |
| Bolt-Flywheel Housing | 90-100 | 122-136 | |
| Bolt-Idler Gear Hub and Dummy Hub | 80-90 | 108-122 | |
| Bolt-Tach. Drive Cover | 30-35 | 41-47 | |
| Bolt-Engine Mtg Brkt to Frt Cover | 90-100 | 122-136 | |
| Bolt-Front Cover (Crankshaft) | 80-90 | 108-122 | |
| Bolt-Flywheel Housing Large Hole Cover | 30-35 | 41-47 | |
| Bolt-Rocker Shaft Bracket to Cyl Head | 90-100 | 122-136 | |
|
1/2-20
|
Standard Torque Specification | 83-93 | 113-126 |
| Bolt-Blower Rotor Gear Retainer | 55-65 | 75-88 | |
| Nut-Oil Pump Drive Idler Gear Shaft | 60-70 | 81-95 | |
| 9/16-12 | Standard Torque Specification | 90-100 | 122-136 |
|
9/16-18
|
Standard Torque Specification | 107-117 | 145-159 |
| Nut-Crankshaft Bearing Cap | 140-150 | 190-203 | |
| Bolt-Flywheel | 180-190 | 244-258 | |
| Bolt-Flywheel (V-53) | 12-16 | 16-22 | |
| Bolt-Cylinder Head | 140-150 | 190-203 | |
|
5/8-11
|
Standard Torque Specification | 137-147 | 186-199 |
| Bolt-Starter to Aluminum Flywheel Housing | 95-105 | 129-142 | |
| Bolt-Main Bearing (Boring) | 165-175 | 224-237 | |
| Bolt-Main Bearing (Assembly) | 180-190 | 244-258 | |
| Bolt-Cylinder Head | 190-200 | 258-271 | |
|
5/8-18
|
Standard Torque Specification | 168-178 | 228-241 |
| Bolt-Lube Oil Filter Center | 50-60 | 68-81 | |
| Nut-Alternator Pulley | 70-80 | 95-108 | |
| Nut-Special Self Locking Nut (10SI Alternator) | 40-60 | 54-81 | |
| Bolt-Main Bearing (Boring) | 140-155 | 190-210 | |
| Bolt-Main Bearing (Assembly) | 155-185 | 210-251 | |
| Nut-Cylinder Head | 190-200 | 258-271 | |
| 3/4-10 | Bolt-Crankshaft Main Bearing | 280-290 | 380-393 |
|
3/4-16
|
Standard Torque Specification | 290-300 | 393-407 |
| Nut-Accessory Drive Pulley | 120-140 | 163-190 | |
| 3/4-18 | Nut Standard, Dipstick Tube | 30-35 | 41-47 |
| 3/4-24 | Bolt-Balance Weight Cover | 25-30 | 34-41 |
| 7/8-14 | Standard Torque Specification | 475-485 | 644-658 |
| 7/8-18 | Bolt-Oil Pump Relief Valve Cover | 25-35 | 34-47 |
| 1-14 | Bolt Crankshaft End | 440-460 | 597-624 |
| 1 1/8-18 | Nut-Cam and Balance Shaft | 300-325 | 407-441 |
| 1 3/4-16 | Nut-Transfer Drive Gear (Marsden) | 375-400 | 508-542 |
Torque Specs For Detroit Diesel Series 71 (Inline Except 2 Cylinder) Pipe Plug |
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|
Plug Size in.
|
Description
|
Torque Specifications | |
| lb-ft | N-m | ||
| 1/8-27 | Plug-Pipe (3/4 Taper) | 10-12 | 14-16 |
| 1/4-18 | Plug-Pipe (3/4 Taper) | 14-16 | 19-22 |
| 1/4-18 | Plug-Pipe (3/4 Taper) | 38-42 | 52-57 |
| 1/4-18 | Plug-Pipe (7/8 Taper) | 14-16 | 19-22 |
| 3/8-18 | Plug-Pipe (3/4 Taper) | 18-22 | 24-30 |
| 3/8-18 | Plug-Pipe (7/8 Taper) | 18-22 | 24-30 |
| 1/2-14 | Plug-Pipe (3/4 Taper) | 23-27 | 31-37 |
| 1/2-14 | Plug-Pipe (7/8 Taper) | 23-27 | 31-37 |
| 3/4-14 | Plug-Pipe (3/4 Taper) | 33-37 | 45-50 |
| 3/4-14 | Plug-Pipe (7/8 Taper) | 33-37 | 45-50 |
| 1-11 1/2 | Plug-Pipe (3/4 Taper) | 75-85 | 102-115 |
| 1-11 1/2 | Plug-Pipe (7/8 Taper) | 75-85 | 102-115 |
| 1 1/4-11 1/2 | Plug-Pipe (3/4 Taper) | 95-105 | 129-142 |
| 1 1/4-11 1/2 | Plug-Pipe (7/8 Taper) | 95-105 | 129-142 |
| 1 1/2-11 1/2 | Plug-Pipe (3/4 Taper) | 110-130 | 149-176 |
| 1 1/2-11 1/2 | Plug-Pipe (7/8 Taper) | 110-130 | 149-176 |
| 1/2-20 | Plug-Fuel Pump Relief Valve | 18-22 | 24-30 |
| 1 1/4-16 | Plug-Oil Filter Bypass valve | 95-105 | 129-142 |
Torque Specs For Detroit Diesel Series 71 (Inline Except 2 Cylinder) Stud |
|||
|
Thread Size (in.)
|
Description
|
Torque Specifications | |
| lb-ft | N-m | ||
| 7/16-20 | Stud Standard | 30-35 | 41-47 |
Overtightening and Undertightening
- Overtightening can cause bolts or studs to stretch beyond their yield point, weakening the material and potentially leading to fracture or engine failure.
- Undertightening can allow components to shift under stress, leading to vibrations, leaks, or even catastrophic failure.
Final Checks
Once assembly is complete, it’s crucial to conduct a final check. This includes rechecking all torque values and monitoring for any signs of leaks or misalignment. Torque should be applied in stages to avoid uneven pressure or damage to components.
Recommended Sealants and Techniques to Prevent Leaks After Assembly For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Proper sealing is critical for the longevity and performance of the Detroit Diesel 71 Series engine. Using the correct sealant, ensuring gaskets are new and properly installed, and preparing mating surfaces effectively are all crucial steps to prevent oil, coolant, or air leaks after assembly. Following these practices ensures that the engine operates efficiently without the risk of component failure or contamination.
Use the Correct Sealant
Using the appropriate sealant for specific engine components is key to ensuring proper sealing. Different parts of the engine require different types of sealants based on factors such as heat resistance, pressure tolerance, and chemical exposure.
- Manufacturer Recommendations
- Application
- Avoiding Excess Sealant
- Heat-Resistant Sealants
Install New Gaskets
It’s essential to use new gaskets during engine reassembly to ensure a proper seal between mating surfaces. Reusing old gaskets can lead to poor sealing, leaks, and reduced engine performance.
- Replace Old Gaskets
- Choose High-Quality Gaskets
- Ensure Proper Gasket Fitment
- Light Coat of Sealant
Gaskets & Seals For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Detroit Diesel 671 Overhaul Gasket Set
Gaskets & Seals For Detroit Diesel 271 Engines
Gaskets & Seals For Detroit Diesel 371 – Non Turbo 2-Valve
Gaskets & Seals For Detroit Diesel 371 – Non Turbo 4-Valve
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Ensure Proper Mating of Surfaces
Before reassembly, it is essential to clean and inspect the mating surfaces to ensure that they are smooth, free from debris, and capable of forming a proper seal when clamped together.
- Surface Cleaning
- Smooth and Even Surfaces
- Use Proper Fastening Technique:
Final Checks for Leaks
After completing assembly and running the engine, it is important to perform a thorough inspection for leaks. This ensures that all seals and gaskets are working properly and that no fluid or pressure is escaping from the system.
- Initial Engine Run
- Visual Inspection
- Re-Torque Fasteners
- Pressure Testing
