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Help: Dipstick blows out of engine RB26DETT !!

xfixiate

By xfixiate,
in Engines & Forced Induction

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xfixiate Rising Star

xfixiate

Posted
Posted

After putting the new turbos into the car, the oil dipstick is blowing out of the hole.

Before I put the new turbos in, I made sure the compression was OK and even in the engine (168psi when 171psi is the upper limit). Standard turbos, rebuilt to steel wheel and ball bearing specs.

I'm wondering whether the Exhaust Gas Recirculation system might be blocked - a look through Nissan Fast has me confused about where the valves are and what might be happening. The AAC valves also sem to have soemthing to do with this - buggered if I can figure it out.

Tuner reports the car is currently making about 170rwkw on 9psi boost, so I'd like to check that the crankcase ventlation system is OK before worrying about possible broken or rolled piston rings.

Could someone please give me an idea on how to check this part of the system, and what parts might be gunked up or blocked??

Cheers,

John

cameron Mentor

cameron

Posted
Posted

Pressure build up in the sump is proberly from worn piston rings, and on compression stroke air goes straight past them into sump and has to go out some were.... out the dipstick.

Are you loosing any oil ? blowing smoke from exhaust ?

If that's the case its rebuild time.

:P

Jun

xfixiate Rising Star

xfixiate

Posted
  • Author
Posted

Compression is 168. Can't see how it can be this high with badly worn or cracked rings.

Not using oil or smoke.

When turbos were stuffed there was a lot of gunk generated so I suspect a blocked PCV or some other part/tube around it that would normally take air from the sump and inject it into the inlets.

Where is the PCV and any other bits that could be the culprit? Is the PCV cleanable or replaceable? I can't find it in FAST or the manual. Personally I'm confused about the PCV vs AAC valve arrangement

thechief Apprentice

thechief

Posted
Posted

Sounds like excessive blowby pressurising the sump. A dry comp test will not always show ringland damage in its initial stages, I'm with fats, but rather than retaining the dipstick with a spring run both breathers to atmosphere to relieve all pressure, start saving some $ and pull her when she really starts breathing.

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