Dipstick O ring- cause of leak

[Soulman]

So I am doing t belt, etc and was hoping replacement of cam and crank seals would stop my significant oil leak. Upon disassembly, those gaskets do not appear to be leaking. Thought I would replace the dipstick o ring just for fun and discovered that there was no o ring in place. Could this be the source of a fairly significant leak?


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[nissanh]

Yes, I think I am also having the same issue.

How many miles in your truck? Make sure to use OEM (should say "NOK" on the oil seal rubber lip). There is a counterfeit brand called "KOK". Simply buy from the dealer to avoid the hassle.

 

[Soulman]

I got mine from the dealer. It was too small to have anything printed on it I think. About the diameter of a dime.


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[catrains]

all engines when running will have a slight vacuum in the crank case . this effect can reduce any leak .

what I have found with oil leaks is the engine oil if used too long does chemically react to rubber parts.. cause hardening , then as the engine parts expand/contract the rubber is not flexing properly to keep it sealed..

when a vehicle does get to the 15 plus age I have used small amounts of bars engine oil stop leak. container has 12 oZ . I only add 2-3 OZ .. works good on my 1996 .

unfiltered air into the crank case is not good ..

 

[Soulman]

If the crank case is sucking in air, why is there a PCV on the motor? Not doubting you just trying to understand the system. Thank you.


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[octanejunkie]

Learn about crankcase ventilation here

 

[Soulman]

Learn about crankcase ventilation here

Actually read that before I replied ;-) the poster above says the crank case is sucking in air- unless I’m reading it wrong?


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[octanejunkie]

Actually read that before I replied ;-) the poster above says the crank case is sucking in air- unless I’m reading it wrong?


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The engine is a big air pump and depending on several factors, and timing, it does both. The same rings and oil that seal the combustion chambers and allow compression, will create vacuum in the crankcase. In the opposite direction, on exhaust, the crankcase is pressurized. With the offset of compression and exhaust strokes of the various cylinders, the vacuum/pressurization effect of the crankcase is equalized, or mitigated to a large extent; and then there's heat.

The PCV allows the engine to equalize crankcase pressure while controlling hydrocarbon emissions. It is not a hermetically sealed system and air exchange is possible, and required.

 

[HiLife]

There is also another o-ring between the dip stick tube and engine. Maybe the rubber has harden and causing an oil leak?

 

[Soulman]

My mistake, I am referring to the dipstick TUBE o ring. That was completely gone in mine. Would that possibly cause a fairly significant leak? 225K miles.


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[HiLife]

ohhhh yaaaa:nod:

 

[snow junky]

When I replaced my stick tube for 2wd pan swap I noticed a loose fit so I caked it in rtv. Never noticed a leak tho.

Crank case is only at vacuum around idle. At Higher rpm most have a little blow by and little. positive pressure. When I had turbo set up wrong I sent 16 psi into crank and oil shot out everywhere.


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