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series 3 3.4 exhaust manifold heat shield
Posted: Wed Jul 13, 2016 9:39 pm
by CliveRothwell
Hi
1985 3.4 series 3 exhaust manifold heatshield.
Does anybody know the thread sizes of the 2 fixing bolts please? the rear most one is considerably bigger than the other........
Where might I be able to buy them please?
Re: series 3 3.4 exhaust manifold heat shield
Posted: Fri Jul 15, 2016 9:37 pm
by ptjs1
Clive,
This might be a red herring but I guess there's a chance that they are the same as the ones on the 4.2 engine fitted to the DS420. If they are, then they are still available from Jaguar. The prices are £0.40 and £6.15 which perhaps explains the differences in sizes!
I hope I haven't mislead you!
Paul
Re: series 3 3.4 exhaust manifold heat shield
Posted: Sat Jul 16, 2016 10:20 pm
by CliveRothwell
Great answer Paul! Many thanks.
Re: series 3 3.4 exhaust manifold heat shield
Posted: Sat Jul 16, 2016 10:41 pm
by davidr
Clive - one of the best things I ever bought was a thread repair kit like this below.
- image.jpeg (17.99KiB)Viewed 4230 times
Not only can it be used to clean up threads it is also very valuable for trying against threads to see what size they are. Mine has UNF, UNC and metric sizes. About £33 on eBay and an excellent investment!
Hope that helps
David
Re: series 3 3.4 exhaust manifold heat shield
Posted: Sun Jul 17, 2016 12:40 pm
by PaulGover
AFAIK, the bolts go into helicoil inserts rather than threads cut in the manifold. So if you see some, don't assume the manifold's been repaired in the past; they came like that. Or at least, my '81 4.2 engine did.
Re: series 3 3.4 exhaust manifold heat shield
Posted: Sun Jul 17, 2016 9:39 pm
by CliveRothwell
all very helpful - many thanks