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Re: valve gasket replacement: something for amateurs? Posted by Ari [Email] ![]() ![]() In Reply to: valve gasket replacement: something for amateurs?, Bry M., Thu, 23 Aug 2001 20:25:29 Members do not see ads below this line. - Help Keep This Site Online - Signup |
As Fred says, an easy task. Takes about an hour - less if the old valve cover gasket stuff comes off easily.
Just a few notes -
Some folks say to use no sealer on the surface between the head and the gasket. Most manuals I have say to use a sealer, and I've never been able to make one not leak without sealer. I use Loctite 518, and I've heard good things about Permatex Ultra Blue (sounds like a porn star). You don't need to slather it on - just a thin bead will do.
For me, the toughest part is getting the old gasket off the head. Yes, it peels off, but you want a nice clean surface for the sealer/new gasket. I use a small piece of Scotchbrite, and am careful not to get the filings into the oil. I usually do an oil change within a week or so anyway, just to be sure. No great skill here, just tedious. In some cases the old gasket has come off clean.
While you're in there, check the timing chain. Turn the engine over to TDC for cylinder #1 (by the timing mark on the tranny) and look at the cam sprockets. There are marks on the cams and on the head. If they line up well, the chain is in good shape. If not, the chain may be worn. Inspect the chain and sprockets for wear. There is an excellent writeup for this in the 900 Bentley manual. If the chain is a bit rattly, buy an upper chain guide - it's just a rubbery thing mounted on the underside of the valve cover, and very easy to replace.
Check your torque wrench against the settings - I don't remember it off the top of my head, but I vaguely remember a torque of 11 foot-pounds. Many large wrenches don't go down that low. I keep two wrenches - one big 'click-type' wrench that goes from 20-150 foot pounds (and I don't trust 20), and a cheap 'beam-type' wrench that goes up to about 25 foot pounds.
posted by 140.157....
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