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The Oil Pump Stuffed It

druzilla32

By druzilla32,
in Engines & Forced Induction

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druzilla32 Mentor

druzilla32

Posted
Posted

we found out why my rb26 died, it wasnt from too much boost like we first thought.

this is the side of one of the pistons:

post-1-1127821546.jpg

scratched up pretty bad

and we think this was the problem:

post-1-1127822028.jpg

perhaps in japan they upgraded the pump but used the standard crank.

so for the other guys building there rb26's, if your going to upgrade to an N1 oil pump, you might want to get a 33gtr crank, or atleast get the standard one built up so the driver is longer

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Cubes Grand Master

Cubes

Posted
Posted

Thats not the problem.

The problem occurs when they actually crack.

Open up the oil pump and inspect the internal gear.

I've seen a few pumps that are fine but have a little wear on the drive gear. Unless the wear is so extreme the crank drive spins without touching the oil pump drive, in your case this is not the case. :)

druzilla32 Mentor

druzilla32

Posted
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so thats normal for an R32?

why is the side of the piston all scratched up?

there are big scratches like this on 2 pistons, and all the other ones have similar marks but not as bad. or is normal to have scratches like that?

DoughBoy Veteran

DoughBoy

Posted
Posted

At a guess the pistons from 5 & 6 have the most scuffing? It's normal to get a bit of wear on the skirts, but in severe cases where the pistons have gotten too hot (common in a detonation senario) then they are going to expand a bit more/ scuff & scrape a bit more.

If the motor has been run pretty hot that could lead to overheating, then your pistons would look like that pic i.e. detonation and scuffed hard.

GTRgeoff Grand Master

GTRgeoff

Posted
Posted
so thats normal for an R32?

why is the side of the piston all scratched up?

there are big scratches like this on 2 pistons, and all the other ones have similar marks but not as bad. or is normal to have scratches like that?

All the deep pitting around the top is indicative of detonation, which then starts the scoring. Then oil comes past burning in the combustion chamber causing more detonation and compression is gradually lost.

druzilla32 Mentor

druzilla32

Posted
  • Author
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Doughboy: its from pistons 4 and 5. sorry i dont have pics of bearings and crank. but the crank was fine. i never heard and detonation or anything

geoff: thanks, i guess something like that must have happened..

i just thought it was weird how the driver didnt go all the way in and thought it may have been changed..

thanks for the info

druzilla32 Mentor

druzilla32

Posted
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Posted
Let me guess...your turbos blew as well??

That looks to me like it's had ceramic dust go through it.

it looks like something like that hey, but the turbos are fine.

maby some prick took off the head and droped some rocks in there while i wasnt looking <_< <_<

Sydneykid Grand Master

Sydneykid

Posted
Posted
maby some prick took off the head and droped some rocks in there while i wasnt looking <_<  <_<

No not rocks, Geoff is spot on, some detonation, pieces of molten piston, poor oil control, more detonation, loss of ring seal, more oil, more detonation............etc. Not the oil pump's fault, you either have a tuning problem (most likely) or an injector/fuel supply problem (worth checking).

:P cheers :D

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