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Old 27th December 2011, 08:51 PM   #1 (permalink)
Undutched is European, stick together!
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Rather lost: Oil Pump

Hello,

I am a bit lost on the oil pump issue.

Currently I have a N1 Oil Pump installed (now about 2-3k miles).

When buying it, I had no knowledge about the failure potential.

The question, why and how do they fail?

How difficult (for a shop) is the change of the oil pump? If the fitting does not require removal of engine or sump, I may look into buying one.

Info:
RB28 running GT-SS's

Regards.
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Old 27th December 2011, 11:03 PM   #2 (permalink)
R.I.P.S NZ is down to 7.48 @ 189mph with MGAWOT III
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To change the oil pump requires removal of the sump and although "possible" to remove the sump in place, most agree its far easier to remove the engine and do it properly on an engine stand.

Good luck :-)
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Old 27th December 2011, 11:24 PM   #3 (permalink)
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Just avoid hitting the rev limiter and your be fine with the N1 Pump.
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Old 27th December 2011, 11:29 PM   #4 (permalink)
TurboSE is working on getting this motor back together for summer.
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Quote:
Originally Posted by Undutched View Post
Hello,

I am a bit lost on the oil pump issue.

Currently I have a N1 Oil Pump installed (now about 2-3k miles).

When buying it, I had no knowledge about the failure potential.

The question, why and how do they fail?

How difficult (for a shop) is the change of the oil pump? If the fitting does not require removal of engine or sump, I may look into buying one.

Info:
RB28 running GT-SS's

Regards.
As to the "how/why", from what I've gathered is high RPM's shatter the gear. it scared me enough that I sold my pump and purchased a Tomei. People have run N1's with success though.
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Old 28th December 2011, 10:59 AM   #5 (permalink)
Undutched is European, stick together!
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I think that'll be on the list for next year then if it needs removal. My personal redline is at around 7,500 due to the GT-SS running close to their peak power.
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Old 29th December 2011, 12:13 AM   #6 (permalink)
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worn out/poor harmonic balancers are a factor too
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Old 29th December 2011, 12:22 PM   #7 (permalink)
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The gerotor gearing is made out of sintered metal. Because of the way sintered metal is formed it has a brittle property which is the weak point exploited by a higher reving engine and the vibrations that occur. This can and will occur even with a servicable harmonic balancer or even an aftermarket type that are available.

Also the early RB26's had the crank collar issue where the contact patch was too small causing that failure.
The following occured with a ross balancer during a downshift from 3rd to 2nd. You can see how the gear broke.
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Old 29th December 2011, 12:26 PM   #8 (permalink)
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Thats a JUN or Greddy pump?
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Old 29th December 2011, 12:41 PM   #9 (permalink)
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I think it's an N1
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Old 29th December 2011, 12:48 PM   #10 (permalink)
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Originally Posted by armt350 View Post
The gerotor gearing is made out of sintered metal. Because of the way sintered metal is formed it has a brittle property which is the weak point exploited by a higher reving engine and the vibrations that occur. This can and will occur even with a servicable harmonic balancer or even an aftermarket type that are available.

Also the early RB26's had the crank collar issue where the contact patch was too small causing that failure.
The following occured with a ross balancer during a downshift from 3rd to 2nd. You can see how the gear broke.
Looking at the tooth pattern I think that is a OEM oil pump, not N1.
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Old 29th December 2011, 12:50 PM   #11 (permalink)
herman is i cant believe my 32 is gone im gutted.
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wish id taken some pics of mine wene i replaced my origanal crank(short nosed)the contact area was stupidly minamal and at the time the garage was full and everyone said so surprised it was still in one piece(lucky for me it still was).ive got a 33 crank in mine now with jun oil pump and harmonic balancer to.i was told alot of the time failours were down the high revving and vibrations.nice pic to show damage caused
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Old 29th December 2011, 07:01 PM   #12 (permalink)
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This is a oem pump, although the N1 suffers from the same sintered material as the oem, only difference is the outside gear diameter is 4mm different, tooth style is the same. That pump was replaced by a N1 Housing and a reimax gerotor gearset and has been happily reving to 9500 rpm since
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