Date: Sat, 04 Sep 2004 12:33:58 +1200 From: Richard Sutherland-Smith <richard.ssnospamr.net.nz> Subject: Re: Tightening Cylinder head?
In message <gkkhj05k29nra17i0v13anncf8inthmn8knospamcom> Colin Stamp <colinnospamp.plus.com> wrote: > On Fri, 3 Sep 2004 07:20:50 +0000 (UTC), "Tomnospamtech" > <saabtechnospamnnect.com> wrote: > > Engine cold:You need a 40 torx bit to undo the cam cover or a 12 mm socket > >and a E16 torx socket for the head bolts, Do them 1 at a time; loosen and > >retorque to 60nm/44ftlb, then 80nm/59ftlb. then 90 degrees. > >This is meant to be a preventative measure and not a cure for a blown > >gasket, But if done in time can quite possibly save you a fair amount of > >money. > >Will the cam cover seal leak if reused?, It will or it won`t, but beware the > >over use of silicone. > >It seems to affect 16 valve engines with balance shafts the most, But I had > >a 1990 900 16v turbo the other day with a blown head gasket and the bolts on > >that engine were nowhere near tight enough. > >HTH Tom, Saabtech. > > Thanks Tom and Bob, > > The one thing that concerns me is in doing this to stretch-bolts. > Aren't they meant to go past their elastic limit on the first 90 > degree yank? Won't doing a second one take them twice as far as > they're meant to go? I wouldn't like to snap any... > > Ah well, I'll check them for obvious looseness and then worry if I > find any. > > Cheers, > > Colin. I have done a couple of heads now and I couldn't believe the torque that the 90 degrees gives. I had to take the handle off my floor jack and then it was hard work. I was told to use the bolts again if none of them were stretched when compared. So far so good! -- Richard Sutherland-Smith 19 Webb Road, Wanganui 5001, New Zealand
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