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
because I have a defected torque wrench. But when I replaced the
culprit with an OEM bolt with a brand new 3/8’’ rated at 5 lbs. to
8o lbs., I stretch 2 more new OEM ones(good thing as the minimum
purchase ar 5 pcs.), I am suspecting that these cam bolts cannot
take 18 lbs. Is there any thoughts or advise out there?
Best Regaards,
LEe
89 VDP
90 XJ 40–
Star-Rider
Alhambra, CA, United States
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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
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In reply to a message from Bryan N sent Thu 1 Apr 2004:
Anyone out there got the OEM Jag service Book for the 4.0, could
you look up & post the Torque figures as quoted for the Camshaft
Cap to Cylinder Head Bolts please, as theyTally with Haynes & my
3,6 litre version,but NOT with the CD Rom so it appears! Thanks,
trying to resolve Lees problem! Bernie–
mesh grilled kiwi wheeled xj40Daimler1990
Dover, United Kingdom
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In reply to a message from Archie Bernard sent Thu 1 Apr 2004:
Bernie,
The JDHT CD-Rom Service Manuals are the ‘OEM Jag service Book’ as
you call it.
The CD contains individually scanned pages of the official factory
Service Manual so there is no disputing the figures I gave you for
the 4.0 litre engine - despite them not matching those quoted by
Haynes.–
The original message included these comments:
Anyone out there got the OEM Jag service Book for the 4.0, could
you look up & post the Torque figures as quoted for the Camshaft
Cap to Cylinder Head Bolts please, as theyTally with Haynes & my
3,6 litre version,but NOT with the CD Rom so it appears! Thanks,
–
Bryan N ('91 Sovereign 4.0 L)
Cambridge, United Kingdom
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In reply to a message from Bryan N sent Thu 1 Apr 2004:
Bryan, I have the Jaguar Service Manuals in Book form, the Green 5
Volume Edition for XJ6 2.9-3,6 Service Manual published by Jaguar
Cars Limited! What Im asking is as they quote Identical figures as
Haynes do for all the Twin cam Engines, in the Hard back version of
the 4.0 litre Manuals, do they quote different figures. when you
replied off post this morning you said you wouldnt think theyd be
any different, theres a printing error somewhere & I d like to see
where it is to determine whether there is indeed a different Torque
figure for 3.6 & 4.0 litre Cam Cap Bolts quoted by Jaguar!
Bernie–
mesh grilled kiwi wheeled xj40Daimler1990
Dover, United Kingdom
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In reply to a message from Archie Bernard sent Thu 1 Apr 2004:
Bernie,
And what I am saying is that whilst you are looking at a piece of
hardcopy paper of a 2.9 / 3.6 XJ6 Service Manual, I am looking at
the corresponding hard copy paper of a 3.2 / 4.0 XJ6 Service Manual
which has been scanned (photographed if you like) and digitally
reproduced on a CD.
There is no difference in what I’m looking at on the screen of my
computer from the CD and what anyone else would see if they had the
actual green covered book in front of them opened at the same page.
The fact that the figures are different is nothing to do with the
different media in which they appear.
And they are different. The 3.6 engine Service Manual (also in the
JDHT CD-Rom) Volume 2, section 12-73 specifies a camshaft bearing
cap torque of 23 to 27 Newton metres (~17 to 20 lbf-ft) as opposed
to the spec for the 4.0 litre in its Service manual of 18 to 22 Nm
(~13 to 16 lbf-ft).
I’ve no idea why!
Perhaps Jaguar discovered that the higher figure stretched the
bolts, as did Lee, and changed it after the end of the 3.6 line.–
The original message included these comments:
Bryan, I have the Jaguar Service Manuals in Book form, the Green 5
Volume Edition for XJ6 2.9-3,6 Service Manual published by Jaguar
Cars Limited! What Im asking is as they quote Identical figures as
Haynes do for all the Twin cam Engines, in the Hard back version of
the 4.0 litre Manuals, do they quote different figures. when you
replied off post this morning you said you wouldnt think theyd be
any different, theres a printing error somewhere & I d like to see
where it is to determine whether there is indeed a different Torque
figure for 3.6 & 4.0 litre Cam Cap Bolts quoted by Jaguar!
–
Bryan N ('91 Sovereign 4.0 L)
Cambridge, United Kingdom
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In reply to a message from Archie Bernard sent Thu 1 Apr 2004:
great thanks Bryan, so there are 2 seperate Torque settings 1 for
th 3.6 & 1 for the 4.0. Everyone should be made aware of this if
they only Have a Haynes Manual, will repost again under Camshaft
Caps Torque Haynes discrepancy beware!–
mesh grilled kiwi wheeled xj40Daimler1990
Dover, United Kingdom
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In reply to a message from Bryan N sent Thu 1 Apr 2004:
As the Haynes & the Jaguar Factory 3,6 Manual, state the same
figures of:23-27 Nm (17-20lbf ft) & these were altered by Jaguar
to:18-22 Nm (13-16lbf ft) for the 3.2 & 4.0 litre Engines, it
appears that they had encountered the problem that Lee has had. Is
it advisable that everyone doing this job should use the revised
clearances as per the 3.2 & 4.0 litre Engines. If so perhaps we
should post an Alert Clearly pointing this out under a new heading?
Bernie–
mesh grilled kiwi wheeled xj40Daimler1990
Dover, United Kingdom
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In reply to a message from Archie Bernard sent Thu 1 Apr 2004:
Bernie,
Posting it to the list will mean that it gets buried in the
archives. Few people access them and if they do, what would prompt
them to look for that subject?
There is a section of the XJ40 on-line book designed for just such
an eventuality - section 14.1 ‘Haynes Errata’
There is nothing in that section at the moment but perhaps you
could compose a statement of the bare facts for Pascal to slot in
there.–
The original message included these comments:
As the Haynes & the Jaguar Factory 3,6 Manual, state the same
figures of:23-27 Nm (17-20lbf ft) & these were altered by Jaguar
to:18-22 Nm (13-16lbf ft) for the 3.2 & 4.0 litre Engines, it
appears that they had encountered the problem that Lee has had. Is
it advisable that everyone doing this job should use the revised
clearances as per the 3.2 & 4.0 litre Engines. If so perhaps we
should post an Alert Clearly pointing this out under a new heading?
Bernie
–
Bryan N ('91 Sovereign 4.0 L)
Cambridge, United Kingdom
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