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CATEGORY LISTINGS > MAINTENANCE / SERVICE > 3116 CAT Blowby Problem [ REFRESH ]
Thread Title:

3116 CAT Blowby Problem


Created On Monday November 17, 2003 00:49 Diesel Talk
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topkote
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Joined: Nov 2003

Note Monday November 17, 2003 00:49 View thread in raw text format
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I have a 3116 CAT engine in a truck that has 53000 miles on it. According to CAT the engine has 2000 hours on it.

The engine is leaking oil from the front of the engine and out of the area by the fuel pump. It has a fair amount of blowby out of the tube at bottom of the engine and out of the cap on the valve cover area.

There is no oil leaking from either of these just in the areas in the front of the engine.

The engine does not smoke. It runs well and has plenty of power.

The CAT dealer told me that the engine needs to be rebuilt. This vehicle belonged to a national fleet company with a regular maintenance schedule on their trucks… this one included. Is it possible for this engine to be worn out?

Any suggestions are appreciated.


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Mike Hall
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lrtnp
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Joined: Aug 2002

Note Monday November 24, 2003 16:40 View thread in raw text format
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The first think I would do is take an oil sample.See what that comes up with.Second thing to do is
check the blow by.,there a specs on what is exceptable.With 53,000 miles I cant see why it would need
an overhaul.You may have one component that went bad,but you say you have plenty of power.
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MotorCityMotorMan
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Joined: Apr 2004

Note Wednesday April 21, 2004 22:46 View users profile View thread in raw text format
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One problem with this engine is that it does not have replaceable cylinder liners. The cylinders tend to get "out of round" after several hundred hours of running which makes it harder for the ring "package" to control engine oil consumption. If the oil gets into the top ring land it can get "coked " in the land and then the top ring can't control compression as well as designed. This contributes to blow by.

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John Arting
Sr. Engine/Dyno Technician
Bearing Specialist
Federal Mogul Technical Center
Plymouth, Michigan
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FjordenDiesel
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Joined: May 2006

Note Thursday June 01, 2006 20:26 View thread in raw text format
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Hi..

The above fellows are right. First take out an oil sample, so you can have an idea of the wear status. Second, change the front crankshaft oil seal because of the age and duty of the engine. Third, you may have a little problem with your engine's valve guides. Assuming that you are in engine bussiness you may take out the valve springs from one cylinder at the time (with piston in TDC) and check the wear, generally exhaust valve guides are worn quickly with some extreme bad driving habits.

Good luck

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Marine,Industrial & Genset Diesel Engines. Chile
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