Oil coming from the cam cover, snapped bolt (I noticed it was loose and it pulled right out.
I need a plan of action to fix this. I’m abosultly gutted
![Image](http://uploads.tapatalk-cdn.com/20230402/6d31e3ade9a35e2b166a94f0a9aaef04.jpg)
First I packed the crevices with rags, then when drilling, regularly dip the drill bit into grease, this will make the shavings and dust stick to the bit, clean the bit lots and wipe with a rag as you gotony.mon wrote:So how did you stop drilling swarf from getting into the engine?
I count myself lucky them as it could have been a lot worse. At first I thought I wouldn’t be able to get my drill in behind the wheel and though I might have to drop the engine. Hence why my original post was a tad dramatic hahasirch345 wrote:The good thing about shearing one of those cam cover bolts is, due to the shoulder on the bolt it stops the thread tightening up like a normal stud does, meaning it stays lose in the threads of the cylinder head. They are easy to shear though. I have managed to undo a sheared one by unscrewing it enough with a small electrical flat blade screwdriver so you can grab it with a long nosed pliers to undo and remove. At least you got it out![]()
As Tony says, what happened to the swarf?
Chris.
Yep, totally my fault I think! I recently had the cam covers off to check clearances. I did them up l too tight (I’ve now ordered a torque wrench) but I know for sure it didn’t snap when I did it up! The only thing I can put it down to is that I put a hairline fracture in it, and when I had it running the other day the heat expansion got to it? I know that sounds very unlikely, maybe even impossible? But it’s the only think I can think of right now as I am 100% sure I did not feel it go loose!Jamoi wrote:Good save!
Has it recently been worked on? Seems odd to have randomly sheared off.
Due to that shoulder on the bolt, it stops the threaded part from bottoming out when tighten it up, therefore what happens with over tightening is the threads get stretched before shearing off, don't ask how I knowLewisB wrote: ↑Sun Apr 02, 2023 8:31 pmYep, totally my fault I think! I recently had the cam covers off to check clearances. I did them up l too tight (I’ve now ordered a torque wrench) but I know for sure it didn’t snap when I did it up! The only thing I can put it down to is that I put a hairline fracture in it, and when I had it running the other day the heat expansion got to it? I know that sounds very unlikely, maybe even impossible? But it’s the only think I can think of right now as I am 100% sure I did not feel it go loose!Jamoi wrote:Good save!
Has it recently been worked on? Seems odd to have randomly sheared off.
Thank you engineers who put a shoulder on those boltssirch345 wrote:Due to that shoulder on the bolt, it stops the threaded part from bottoming out when tighten it up, therefore what happens with over tightening is the threads get stretched before shearing off, don't ask how I knowLewisB wrote: ↑Sun Apr 02, 2023 8:31 pmYep, totally my fault I think! I recently had the cam covers off to check clearances. I did them up l too tight (I’ve now ordered a torque wrench) but I know for sure it didn’t snap when I did it up! The only thing I can put it down to is that I put a hairline fracture in it, and when I had it running the other day the heat expansion got to it? I know that sounds very unlikely, maybe even impossible? But it’s the only think I can think of right now as I am 100% sure I did not feel it go loose!Jamoi wrote:Good save!
Has it recently been worked on? Seems odd to have randomly sheared off.![]()
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Chris.
I imagine the shoulder is to prevent anyone putting to much pressure on the cam cover seal by over tightening the bolts, also by having shoulders on all four bolts that gives even pressure on the c/cover seal all the the way round.LewisB wrote: ↑Tue Apr 04, 2023 3:46 pmThank you engineers who put a shoulder on those boltssirch345 wrote:Due to that shoulder on the bolt, it stops the threaded part from bottoming out when tighten it up, therefore what happens with over tightening is the threads get stretched before shearing off, don't ask how I knowLewisB wrote: ↑Sun Apr 02, 2023 8:31 pm
Yep, totally my fault I think! I recently had the cam covers off to check clearances. I did them up l too tight (I’ve now ordered a torque wrench) but I know for sure it didn’t snap when I did it up! The only thing I can put it down to is that I put a hairline fracture in it, and when I had it running the other day the heat expansion got to it? I know that sounds very unlikely, maybe even impossible? But it’s the only think I can think of right now as I am 100% sure I did not feel it go loose!![]()
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Chris.![]()