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RB26 Front Crank Seal Failure - Help

Hardwork

By Hardwork,
in Engines & Forced Induction

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Hardwork

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RB26 Front Crank Seal Failure - Help

Hey guys, needing some expert help with diagnosing as engine breathing/ventilation stretches my problems solving!

Ill give as much related info as I can;

Car Is Stagea 260Rs, making around 290awkw with reimax oil pump gears (slightly larger clearances on the crank than OEM if that helps), no catch can or different breathing set up.

Had an undetected oil leak for two days before a serious leak occured suddenly. Pulled engine out as I suspected fractured oil pump gears due to larger than OEM crank clearances. Turned out to be a failed front Crank seal, seal has spilt in half, spliting into two round bits and the metal inside the seal now looks like a kitchen sink scour. The seal was replaced less than 3,000km ago.

Ive done some research on SAU to try find some answers, and Im led to believe its something to Do with crankcase ventilation, moreso pressurization of the crankcase. Ive also spotted oil in the pre turbo intakes, and ic piping. Car also gives smoke off on WOT.

Any input would be appreciated

 

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Dale FZ1 Veteran

Dale FZ1

Posted
Posted

The fact you've got a non-standard oil pump says the engine has been out before, and subjected to some sort of build/rebuild.  Have you consulted with the engine builder and/or the person who recently replaced the seal?

 

Why was the seal replaced? - and what was the previous one looking like?

Are you sure you got the correct seal, and that it was installed properly?

Pressurized crank case won't destroy a front main seal as described.  Post up a picture.

 

Spitting a bit of oil through the breathers and into the inlet is nothing extraordinary, especially if it's running higher than standard boost (290awkW says yes).  No indicator whether you're blowing blue smoke or black - could be oily inlet, could be rich AFR (poor tune), could be both.  Either way, this is not likely related to your main seal problem.

 

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted
10 hours ago, Hardwork said:

 

Ive done some research on SAU to try find some answers, and Im led to believe its something to Do with crankcase ventilation, moreso pressurization of the crankcase. Ive also spotted oil in the pre turbo intakes, and ic piping. Car also gives smoke off on WOT.

Any input would be appreciated

 

For input on the above questions read say the last half of this thread:

Regarding the failed seal your first port of call should be the people who installed it.

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Hardwork Collaborator

Hardwork

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Posted

I installed it myself, I believe I followed the service manual. Previous seal was fine.

My son has pictures, will post the tomorrow. 

Black smoke Is coming out on WOT. But not all the time.

Thanks for the input guys, greatly appreciated.

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