This may be helpful to those planing on plating there engine bolts. I had various bolts & nuts nickle plated. One head bolt snapped like a carrot. I had already torqued the head down, run the engine and was re tensioning the head after an overnight cool down. After carefully backing off all bolts and nuts in reverse order I re torqued, 30 ftlb for the 3/8 bolts and latter in the day my son asked how come one head bolt was lying next to the spark plug. Bugger, that ruled out the promised shakedown run that afternoon. After some deliberations overnight, I decided to have a go extracting the offending broken off section of the bolt, without removing the head. I armed myself with a 1/4" long drill bit, machined up a 3/8" to 1/4" clearanced sleeve, this was used to protect the head and centralise the 1/4" drill bit. And carefully bored a hole through the centre of the broken off bolt, then with a partly broken Ezi-out I was able to carefully unwind the broken section out. Bit of compressed air and a 3/8" cycle thread tap to clean out and ALL-GOOD!
I was very happy to get away without having to pull the head.
So moral is replace your head fastenings, as the consequences are not worth considering, I think I got off lightly?
Cheers Richard
I was very happy to get away without having to pull the head.
So moral is replace your head fastenings, as the consequences are not worth considering, I think I got off lightly?
Cheers Richard