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What are some of the Cummins QSC8.3 engines general specifications?

This engine is a 4 cycle inline 6 cylinder engine with a displacement of 8.3 liters, a bore of 4.49 inches and a stroke of 5.31 inches.


What is the allowable radial load on the crankshaft (maximum)?

192 lb at 0 degrees and 270 degrees. 490 lb at 90 degrees. 1106 lb at 180 degrees. Exceeding these limit may damage the vital parts of your engine.


What are the proper engine angles for vessel operation with a Cummins QSC8.3?

For steady state operation, engine pitch angle (front up from horizontal):
-35 degrees minimum.
45 degrees maximum.

All drives with intermittent operation, engine roll angle (from right/left when viewed from flywheel side of engine):
Maximum of 45 degrees right
Maximum of 45 degrees left.

Engine pitch angle, intermittent operation:
-45 degrees minimum.
45 degrees maximum.


What are the Cummins QSC8.3 fuel system specs?

Diagnosing fuel restriction is a good way to determine which QSC8.3 parts you need, and which ones you don't. The maximum allowable restriction to the fuel pump is 2.5 in Hg with a clean filter or 4 in Hg with a dirty filter. The maximum allowable return line pressure is 10 in Hg.


How do I know if the maximum static pressure is too high?

For the QSC8.3, the maximum pressure is 10 in Hg.


How high can a fuel tank be above the fuel pump in the Cummins QSC8.3?

Checking this can prevent the replacement of parts that might not need to be replaced. Make sure your fuel tank is no more than 13.5 feet or 4.12 meters above the fuel pump.


What is the maximum allowable back pressure for the QSC8.3's exhaust system?

5 in Hg.


What is the maximum incremental direct load?

At the turbine outlet mounting flange, it is 20 lb. Exceeding this can damage other engine parts.


What are the air intake specs for the Cummins QSC8.3?

The max allowable intake restriction is 381 in H20 with a clean filter and 25 in H20 with a dirty filter. Please note this is for QSC 540 and below. For QSC 550 and 600, it is 10 in H2O with a clean filter and 15 in H2O with a dirty filter. The air intake is vital to keeping the other related parts in the engine running smoothly and should be checked when trying to diagnose other engine issues.