Always check your oil banjo bolts!

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keehn
Posts: 14
Joined: Tue Oct 01, 2019 5:14 pm
Location: Martinsburg, WV

Always check your oil banjo bolts!

Post by keehn » Sun Oct 27, 2019 12:24 pm

This is the first time I've taken the valve cover off since I purchased "Eleanor", and sure enough, the rear banjo bolt was FINGER loose!

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(the bolt to the center-left holding the oil rail to the head)

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(a closer look at the bolt in question)

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(My botched attempt at drilling a hole through the bolt...but it'll hold regardless)

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(I used some stranded copper wire to secure the banjo bolt to the oil rail.)

I forgot to take a picture of the fix, but this will hold until I do the whole engine rebuild this winter.

Bottom line: The M30 engines of this design should all be checked for loose banjo bolts. What happens at first is oil starvation to the rear rocker arms, accelerating wear. But the worst part is, should the bolt come loose, it could cause catastrophic failure to the entire engine!

PatinaBeforePolish
Posts: 239
Joined: Sun Jan 18, 2015 1:22 pm
Location: Baltimore, Md.

Re: Always check your oil banjo bolts!

Post by PatinaBeforePolish » Mon Oct 28, 2019 5:31 am

Those are single use washers and the current hollow bolts from BMW have thread locker pre-applied. About 8 bucks per assembly, cheap insurance.
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keehn
Posts: 14
Joined: Tue Oct 01, 2019 5:14 pm
Location: Martinsburg, WV

Re: Always check your oil banjo bolts!

Post by keehn » Mon Oct 28, 2019 3:03 pm

Patina,

It is something I'm considering. I just bought another M30 head that comes with the banjo bolts...but I'll likely purchase the new bolts come rebuild time. This is only intended as a temporary fix until the snow starts falling.

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