Oil sump bolts

L

Liamd

Member
Hi, I recently decided to sort out my leaking oil sump gasket on my 2.5 litre M54 engine. I drained the oil, suspended the engine, dropped the sub frame, disconnected the dipstick tube and dropped the sump. I give it a good clean as well as the joining surfaces. Put the new gasket on with the sump, which was a lot trickier than I thought, then hand tightened the bolts. Once I had them all on, I then started to torque them on, only 10nm, going in a star pattern I did 4 bolts, torqued one in the centre end next to the gearbox and just as it clicked, it suddenly went very loose. When I withdrew the socket, half of the bolt came with it.
So, I'm guessing you're not meant to re-use the bolts?
And I can't find any of the bolts on the internet so a little trip to BMW on Monday is in order. Unless anyone knows anywhere on the internet where I can new bolts?
 
On the later N series engines BMW got into aluminium single use bolts but, AFAIK, the M54 was perfectly standard in its fixings so spares should be generally available if you know the size but it's funny there isn't a size against it in RealOEM.
 
Cheers for the RealOEM snap shot, but I've already well versed at looking up parts on there.
The bolts are M6 thread, I've scoured the internet and can only find used. There is one site LLL parts, but they charge about £5 a bolt and takes nearly 2 weeks to arrive. It really surprised me that it snapped at such a low torque.
 
Liamd said:
Cheers for the RealOEM snap shot, but I've already well versed at looking up parts on there.
The bolts are M6 thread, I've scoured the internet and can only find used. There is one site LLL parts, but they charge about £5 a bolt and takes nearly 2 weeks to arrive. It really surprised me that it snapped at such a low torque.
Click to expand...
Has your torque wrench been calibrated recently? I use a small bike torque wrench for these small jobs.
 
It's fairly new and I've only used it once. It did feel like the right torque as it didn't turn much before it clicked. I put all the bolts in first by hand before using the torque wrench.
 
BMW don't make magic bolts, just work out the length and buy some on eBay, Toolstation or your local nut and bolt place. At 10Nm they'd only need to be 8.8 grade.
 
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