In reply to a message from Star-Rider sent Wed 31 Mar 2004:
Lee,
We are talking about the camshaft bearing cap bolts here?
If so, the Service Manual calls for them to be torqued to 18 to 22
Newton meters. That’s a maximum of ~16 lbf ft. (Slightly less than
Haynes specifies)
So, the 18 lbf ft you have been employing, even if your torque
wrench is accurate over that range (when did you last have it
checked?), is a little too high.
BTW, when I did mine, I torqued them down initially with the head
off the car, then when the head was fitted and the head bolts
properly torqued down, I undid each camshaft cap bolt half a turn
and re-torqued it to the spec figure.
The reason for doing that was the evidence that in initial engine
assembly at the factory, a few adjacent camshaft cap bolts had not
remained fully tightened (the shanks of those bolts were oil
blackened when I removed them whereas the others were still
pristine golden colour) after the larger head bolts which pass
through the camshaft caps had been torqued down.–
The original message included these comments:
Me again seeking help on this head refit issue. I had manged to
strech a cam hold down bolt at 18lbs when I was doing final torque
down as per Haynes’ manuel. At first I suspected that maybe
purchase ar 5 pcs.), I am suspecting that these cam bolts cannot
take 18 lbs. Is there any thoughts or advise out there?
–
Bryan N ('91 Sovereign 4.0 L)
Cambridge, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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