- 6.7 CUMMINS REAR MAIN SEAL CRACKED
- 6.7 CUMMINS REAR MAIN SEAL CRACK
Loud single knocking sound when pulling a load: White smoke seen when the engine if first stated (such as in the morning):
Oil cooler element may have a rupture. 6.7 CUMMINS REAR MAIN SEAL CRACK
A leak or crack in the oil cooler element, expansion plugs or cylinder head gasket. If accompanied by white smoke see section below. Fuel injection pump shaft seal is leaking. 
Expansion plug is not in place (causes sudden pressure drop.) Replace the plug. 
Oil pump or bearing is worn (pressure drops over period of weeks or months.) Replace pump. 6.7 CUMMINS REAR MAIN SEAL CRACKED
Oil suction tube or gasket is cracked or damaged, (low pressure usually only when the engine is first starting.) Check and replace tube and gaskets. Oil is high enough to reach connecting rods, resulting in aerated oil. Wait for engine to warm and check/replace the gauge. Cold weather can cause the oil pressure to reach 100 to 120 psi. Oil pressure is high (normal for the Cummins ISB is 65 psi): Listed below are some conditions that users of engines may experience over time, along with possible causes and solutions. 
Total system oil capacity: 17 quarts (19 quarts for deep sump). This model will start with a ISB followed by the displacement of the engine. If you are unsure which type of engine you have, check the dataplate. We have low prices, and let you choose from multiple shipping options, so you can get the parts you want, when you want, at a price that is perfect for your budget. At Diesel Pro, we carry a large assortment of parts for this engine. The ISB is usually used to power heavy duty trucks, including some for highway use, such as some models of the Dodge Ram. The Cummins ISB is a sophisticated inline six cylinder engine that utilizes electronic controlled injectors.
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