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1994 3.2 Blue smoke on startup

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Re: 1994 3.2 Blue smoke on startup

Postby katar83 » Fri Aug 03, 2012 5:02 pm

Considering the fact that is not uncommon for 40 to blow up head gasket this should be fairly standard procedure while head is off. Not to difficult job and well worth doing, although I would not bother with it if its just a small amount of smoke on startup. Better to wait till head gasket fails.
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Re: 1994 3.2 Blue smoke on startup

Postby naki_k » Fri Aug 03, 2012 9:12 pm

M-e-l-l-o-w wrote:
naki_k wrote:is it worth changing these seals. i have heard that they do not last very long generally before they start leaking/ causing smoking again? any thoughts on how long they last?
It all depends on a number of factors but the thing is that this will never get any better.
There is nothing worse than getting in to your beautiful looking Jaguar outside a nice restaurant with your wife and a couple of friends only to start it up and be engulfed in a cloud of blue/grey smoke! It sort of spoils the moment a bit! Trust me it will get this bad and in my experience sooner rather than later, once the seals start to go they will get progressively worse.

How long they last will depend on the ware in the valve guides and the qulity of the new seals.
On a new car with factory seals 100,000 miles + is not unusual. (I have changed them for the first time on 130,000 mile cars.)

In short I would recommend biting the built and doing the job.


yes, good point. i usually park around the back to save the embarrassment :lol:

good recommendation though. i think at the same time as a headgasket sounds like the most efficient time to do it, as if you took the head off anyhow, would you not think about swapping a new head gasket in there too (especially if the car is 100k+ on the clock like all of mine?)
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Re: 1994 3.2 Blue smoke on startup

Postby simoncow » Sun Aug 05, 2012 8:08 am

Reading all of that, it sounds like Castrol 20/50 with an additive and wait until head gasket goes or smoke gets too bad

I find parking with the rear into thick foliage helps when you start up, looks like the trees are on fire but at least it doesn't look like
the car is guilty :lol:

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Re: 1994 3.2 Blue smoke on startup

Postby Nate667 » Sat Dec 02, 2017 5:22 pm

What other jobs can be done apart from the head gasket when changing the valve seal stems?
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Re: 1994 3.2 Blue smoke on startup

Postby SovverBovver » Sun Dec 03, 2017 4:33 pm

Nate667 wrote:What other jobs can be done apart from the head gasket when changing the valve seal stems?

Re-cut the valve seats and do the valve clearances. Also put the head into a parts washer to really clean it up.

Head gaskets are a common problem on the AJ6 engine. My car burnt out an exhaust valve and the cylinder head specialist blamed the head gasket allowing gas to leak between cylinders. Having experienced the problems a burnt out exhaust valve caused, if I got another XJ40, I'd treat the head gasket as a limited service life item and replace it early at a convenient time. I removed and replaced the head myself and found it a reasonably pleasant job if you like that sort of thing.
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Re: 1994 3.2 Blue smoke on startup

Postby pimgmx » Sun Dec 03, 2017 9:18 pm

Nate667 wrote:What other jobs can be done...

Maybe an XXL open door, but clean EVERYTHING you remove before you put it back in.
Especially intake/throttle body components could well contain a surprising amount of gunk...
The idle control valve is another item that wouldn't mind a bit of cleaning and could be quite the improvement of your engine's idle. ;)

With that many engine bolt-ons you need to remove: change the water-pump-to-engine-block-hose (and/or the other coolant hoses while at it).
It only costs a few quid, but its nickname 'b@st@rd hose' is well-deserved: they have a reputation to fail rather spectacularly under full load...
It's one of those parts you wouldn't want to replace if it was the only job on the list (accessing the hose clamps requires serious spannering effort), but would make serious sense when doing a head-off job like you're planning!

Completing the list: check the water pump for axial play and/or bearing noise.
You can get the front half (containing all the moving parts) of the pump new, which requires only a few additional bolts to replace it.

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