[xj40] Torque values for 1988 3.6 head screws

Hi there everyone,
When putting back the engine�s head after replacing head
gasket, i�m not shure about the values to tight the head�s
screws, wich I think they are 11 or 12. I don�t know if this
issue comes in the Haynes Manual, but i�ve all ready ordered
mine, but it still hasn�t arrive. Regards.–
cats
Lisbon, Portugal
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In reply to a message from catsy sent Wed 24 Jan 2007:

Tightening the Cylinder head bolts is atwo-stage process:-

Stage 1 = Torque to 60 Nm (~44 lbf/ft)
Stage 2 = turn the bolts a further 90� EXACTLY

The bolt tightening sequence can be described like this:-

There are 14 head bolts. Number them from the back of the
head to the front thus:-

Inlet side – 14:08:06:01:03:09:11
Exhaust side- 12:10:04:02:05:07:13

Snug them all up initially and finally torque them in strict
numerical order as shown above.

Before doing this, make absolutely certain that all of the
bolt screw holes in the block are perfectly clean and dry
before fitting the head. I always run a bolt down each
thread to ensure that it is not binding at any stage to
upset the torque reading when finally fitted.–
The original message included these comments:

When putting back the engine�s head after replacing head
gasket, i�m not shure about the values to tight the head�s
screws, wich I think they are 11 or 12. I don�t know if this
issue comes in the Haynes Manual, but i�ve all ready ordered
mine, but it still hasn�t arrive. Regards.


Bryan N, '91 Sovereign 4.0 L, (RHD)
Cambridge, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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In reply to a message from catsy sent Wed 24 Jan 2007:

I�m so very thankfull to you Bryan, once again. I was quite
away of doing it wright. For shure that not even my mechanic
new this sequence and values.
Very Best Regards.–
cats
Lisbon, Portugal
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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In reply to a message from catsy sent Wed 24 Jan 2007:

By the way, do the upper valve clamp screws have any
specific tighness?
Regards.–
cats
Lisbon, Portugal
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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In reply to a message from catsy sent Thu 25 Jan 2007:

Yes, the camshaft bearing cap bolts DO have a specific torque.

I’m pleased you asked because this is one piece of
information in the HAYNES manual which is dangerously WRONG.

Haynes calls INORRECTLY for 23 - 27 Nm (16 - 20 lbf/ft)

The CORRECT figure is 18 - 22 Nm (13 - 16 lbf/ft)

If you use the higher Haynes figures the bolts will snap.–
The original message included these comments:

By the way, do the upper valve clamp screws have any
specific tighness?


Bryan N, '91 Sovereign 4.0 L, (RHD)
Cambridge, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !