Cylinder head bent causing cam bearing wear
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Post by: Panda » Fri Dec 11, 2020 6:23 am
I am told by my engineer that the camshaft wear on my Europa twin cam is caused by a bent cylinder head. I believe that oversized cam bearings are not available. Is it a satisfactory solution to close the caps and line bore the tunnel, similar to the situation if the main bearings were misaligned?
Alan P.
Alan P.
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Post by: rgh0 » Fri Dec 11, 2020 7:44 am
Hi Alan
Yes perfectly possible to line bore the cam tunnels like you can a block by machining a little off the caps and then re-boring taking an absolute minimum off the head.
If the head has not been re-machined flat in the bent state it may be possible to straighten the head to realign the cam bores.
cheers
Rohan
Yes perfectly possible to line bore the cam tunnels like you can a block by machining a little off the caps and then re-boring taking an absolute minimum off the head.
If the head has not been re-machined flat in the bent state it may be possible to straighten the head to realign the cam bores.
cheers
Rohan
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Post by: Panda » Fri Dec 11, 2020 7:33 pm
Thanks Rohan, I believe the head is unmolested. I do have a pretty decent torque plate which I will give to Garth at Repairs and Restorations in the hope of straightening it out. Any thoughts on that process?
cheers Alan P
cheers Alan P
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Post by: vstibbard » Fri Dec 11, 2020 7:39 pm
Alan, Being a Europa, is it the extended cam that supports the alternator drive thats bent? If its that cam I would have though it more logical that rather than head bending, it would have worn one or more cam bearings out of round.
V
V
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Post by: Panda » Fri Dec 11, 2020 8:01 pm
Hi Vaughan,
It's actually the exhaust side which is bent. There is some wear on the inlet cam back bearing and the cam has a chip on no.2 lobe so I think it is a throwaway job. I have a photo on my phone which I will send to you.
cheers Al
It's actually the exhaust side which is bent. There is some wear on the inlet cam back bearing and the cam has a chip on no.2 lobe so I think it is a throwaway job. I have a photo on my phone which I will send to you.
cheers Al
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Post by: rgh0 » Fri Dec 11, 2020 9:59 pm
Panda wrote:Thanks Rohan, I believe the head is unmolested. I do have a pretty decent torque plate which I will give to Garth at Repairs and Restorations in the hope of straightening it out. Any thoughts on that process?
cheers Alan P
some information here but lots of other stuff on the Web about it.
https://car-repairs-slacks-creek.com.au ... roblem.htm
cheers
Rohan
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Post by: rgh0 » Sat Dec 12, 2020 2:06 am
https://www.enginebuildermag.com/2014/1 ... ightening/
another link with information on head straightening
cheers
Rohan
another link with information on head straightening
cheers
Rohan
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Post by: elanman999 » Mon Dec 14, 2020 7:07 pm
Alan,
Has your egineer checked to see that the camshafts are straight?
Cheers
John
Has your egineer checked to see that the camshafts are straight?
Cheers
John
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