Anyone see the tip about the oil pump nut backing off at high rpms in ROundel...

[bmw325]

There's an article on the TC Kline Z4s, and TC Kline mentions that the only real problem they had was that at sustained high RPMs, the nut that secures the oil pump backs off leading to oil starvation and engine failure. Realzing this, he now applies loctite to this nut when the engine is new. Might be something for you track junkies who have M54 engined cars to consider (I'm assuming this also applies to the 2.5 liter and not just the 3.0). I've never heard of thie before-- but he said it happeedn on multiple engines. I wonder why it never happened on the M52?

[Nick325xiT 5spd]

It's a HUGE problem on the S52. If you look at bimmerforums, people are scared ****less over it. I would presume that it's also an issue with the M50/52, it's just that they don't tend to get driven quite so hard.

Common practice is to WELD the nut in. :yikes:

[bmw325]

It's a HUGE problem on the S52. If you look at bimmerforums, people are scared ****less over it. I would presume that it's also an issue with the M50/52, it's just that they don't tend to get driven quite so hard.

Common practice is to WELD the nut in. :yikes:

Now that you mention it- yeah I think i have seen some complaints about this on the s52. Any reports of it on the s54? So loctite isn't sufficient to hold the s52 nut in place?

[Raffi]

I saw the tip and it's on my list of things to do to the car - next time I change the oil, I will take the pan off and take care of this.

[cenotaph]

One thing I was wondering was how the loctite would affect the torque speced for the nut.

[SpeedinBlueBima]

How do you take the oil pan off? Anyone have a DIY?

[Andy]

Do you guys think this would have anything to do with the lifter knock I experienced the other day that I discussed HERE (http://www.bimmerfest.com/forums/showthread.php?t=43171) ?

[Nick325xiT 5spd]

Do you guys think this would have anything to do with the lifter knock I experienced the other day that I discussed HERE (http://www.bimmerfest.com/forums/showthread.php?t=43171) ?
Absolutely not. When the oil pump nut goes, you experience a total loss of oil pressure. :eek:

[Andy]

Absolutely not. When the oil pump nut goes, you experience a total loss of oil pressure. :eek:

Oh... I thought this had to do with the oil pump not pumping enough oil at high RPMs I didn't realize it was a total loss of oil pressure.

[Nick325xiT 5spd]

Oh... I thought this had to do with the oil pump not pumping enough oil at high RPMs I didn't realize it was a total loss of oil pressure.
Nope. Oil starvation occurs because the oil just pools at the side of the pan oppsite from the intake. I gues syou just need to stop driving so hard. ;)

[Andy]

Nope. Oil starvation occurs because the oil just pools at the side of the pan oppsite from the intake. I gues syou just need to stop driving so hard. ;)

My car gets driven hard ever other Sunday... and I mean real hard. Every other day she gets babied... maybe a little too much. ;) :drive:

I just want to make sure she's getting plenty of lubrication. :eeps:

[wrwicky]

One thing I was wondering was how the loctite would affect the torque speced for the nut.

No affect AFAIK, in fact I think any liquid on there just helps you set the torque more accurately (no stiction)

[doeboy]

My car gets driven hard ever other Sunday... and I mean real hard. Every other day she gets babied... maybe a little too much. ;) :drive:

I just want to make sure she's getting plenty of lubrication. :eeps:

Then make sure you're always topped off on motor oil... especially if you're gonna drive her hard....

[ff]

... and I mean real hard. Every other day she gets babied... maybe a little too much. ;)

I just want to make sure she's getting plenty of lubrication. :eeps:


Are we still talking about cars here? :p

[Mathew]

Are we still talking about cars here? :p
:bustingup :rofl: