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Old 05-06-2010, 07:39 PM   #1
ChasCan
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Loose Oil Pump Nut??

I'm going to be tracking my xi a lot. So far 3 days at LRP & another 5 coming up b4 the end of June. I've read some posts about the oil pump nut/bolt coming loose. How often does this really happen? And which part of the oil pump actually loosens? Am I being to nervous about this? Chas
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Old 05-06-2010, 10:36 PM   #2
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Originally Posted by ChasCan View Post
I'm going to be tracking my xi a lot. So far 3 days at LRP & another 5 coming up b4 the end of June. I've read some posts about the oil pump nut/bolt coming loose. How often does this really happen? And which part of the oil pump actually loosens? Am I being to nervous about this? Chas
Do a search for more info on this topic, it's been covered to death in this forum.

Keep the RPMs below 6k, and you should be OK at LRP....although I would run an extra quart of oil in the pan. Turn 1 is a long drive around under high load.....

And the good news is you probably won't catch air going up the hill like many race cars. That's a zinger to the engine and driveline.
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Old 05-07-2010, 01:51 AM   #3
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Ditto on just shifting at 6k and you'll be fine. Running it up to 7k constantly is what will kill an M54 if you don't have a revamped OPN.
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Old 05-07-2010, 05:37 AM   #4
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mine came off i shut her down had the nut staked/loctited. you have very little time to save the engine once the nut drops.
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Old 05-07-2010, 06:25 AM   #5
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OK, my bad. I did not do a thorough enough search. Finally found the info I was looking for and whether or not this was just a fairy tale. Thanks for the advice on RPM's but, isn't an extra qt oil the pan a bit much? My dipstick reads full after 8.5 qts. Won't the crank start to cavitate the extra oil in the pan? Chas
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Old 05-07-2010, 07:58 AM   #6
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I don't see how the extra oil helps the situation at hand.

I agree that running an extra 1/2 quart of oil will help keep oil pressure up and thus be good for the rest of the engine, but I don't see how extra oil will keep the OPN from falling off.
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Old 05-07-2010, 08:39 AM   #7
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Ditto on just shifting at 6k and you'll be fine. Running it up to 7k constantly is what will kill an M54 if you don't have a revamped OPN.

Don't the ZHP come from factory with loctite on that nut ? What do you mean by revamped ?
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Old 05-07-2010, 08:53 AM   #8
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Originally Posted by SpeedDemon View Post
I don't see how the extra oil helps the situation at hand.

I agree that running an extra 1/2 quart of oil will help keep oil pressure up and thus be good for the rest of the engine, but I don't see how extra oil will keep the OPN from falling off.
i think he meant that it would help the potential oil starvation from LRP... around turn 1
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Old 05-07-2010, 10:03 AM   #9
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Don't the ZHP come from factory with loctite on that nut ? What do you mean by revamped ?
Yes, they do come with loctite on the nut from the factory.

I was just referring to going with something like a VAC OPN modification, VAIO's 3-point design, or the BMW Motorsport kit. The factory ZHP attachment is much better but not perfect.

When I baffled my oil pan, I through on the VAC Competition Oil Pump as some cheap insurance from starvation.

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i think he meant that it would help the potential oil starvation from LRP... around turn 1
My mistake then for misreading
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