Re: OT.. Brand of oil for Duramax

Posted by Chris Vangel on March 17, 2005 at 20:58:01 from (69.220.82.233):

In Reply to: Re: OT.. Brand of oil for Duramax posted by Davis In SC on March 17, 2005 at 20:40:50:

Many of the heavy truck engines use HELO injection system, primarily Caterpillar engines. There is a sliding scale used to determine proper oil change interval. The more miles on the engine, the shorter the interval.

Because of this, we have seen many Cats that came in running like crap and have a check engine light on. The service code would be "Injection Actuation Pressure low". The first step is always find last oil change, do the math according to engine mileage and see if it"s over due. 50% of these issues are solved with fresh oil and filter.

The HELO injection system uses engine oil to hydraulically operate the injectors. It does this by ramping pressure up to around 2200-2500 psi in the actuation oil circuit. Naturally, this beats the oil to death. That is why oil that is old, contaminated fuel or water, or of the wrong grade will cause the engine to run like crap.

Note: although actuation pressures reach 2500 psi, lube pressure to the internally lubricated engine parts is normal.

That"s what I"ve learned so far about HELO systems.

Chris.

Follow Ups:

• Re: OT.. Brand of oil for Duramax Davis In SC 21:33:12 03/17/05 (1)
  • Re: OT.. Brand of oil for Duramax T_Bone 01:31:14 03/18/05 (0)

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