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fitting cylinder head
Posted: Mon Mar 31, 2014 7:49 pm
by Hugh
Hi all. Have removed and cleaned up cylinder head on 57 bullet. Any tips on putting back on. This in the sense of over tightening head bolts. I guess a UK 1957 350 is pre-torque wrenches but I have had a 1971 Triumph which blew up due to someone over tightening head (aluminium) and thus cracking/twisting (expensive) as it then ran lean so I thought I would seek advice before risking damage. I assume also re-tighten after say 250 miles. Thanks one and all and have a safe and enjoyable summer.
fitting cylinder head
Posted: Mon Mar 31, 2014 10:38 pm
by PeteF
You'll get lots of opinions on this but my twopence worth is.
Make sure the surfaces are clean and flat,composite gasket, no compound, 21 ftlb (dry). No need to re-torque with a composite I was told so I didn't and it was fine
fitting cylinder head
Posted: Tue Apr 01, 2014 7:51 am
by Mark M
What Pete says, plus, run a drill through stud holes to ensure proper clearance and use our Host's hardened steel washers under the sleeve nuts, they are in the Accessory Catalogue.
REgards, Mark
fitting cylinder head
Posted: Tue Apr 01, 2014 4:17 pm
by Hugh
Just wanted to say thanks both. Hugh
fitting cylinder head
Posted: Thu Apr 03, 2014 10:10 am
by Adrian1
The usual diagonal sequence applies. Our host sells the proper washers to put under the nuts. Is it leaking? If so you can use the old dodge that the lads on the Yahoo crusader site use - a bead of silicone where the head meets the cylinder.