I'm (finally) getting started on putting my Jag back together. I found a pair of used heads on ebay to replace my warped ones, but I'm going to need gaskets and head bolts. Any recommendation on a brand to use, or even a warning on ones NOT to use.
I'm going to need head gaskets (obviously) and intake and exhaust manifold gaskgets, what else? I've got the supercharger and the entire intake track removed, is it safe to reuse most of these gaskets?
If I remember the factory service manual says to replace just about every gasket, I'm sure it would be ok to reuse a few of them, but which ones?

Also need some head bolts, what do you recommend?

 

On earlier AJ series engines Jaguar used torque to yield head bolts (TTY) and Jaguar state that they can be used up to three times. Not sure if this helps.

 

I use the MLS gaskets from the later 4.0 and 4.2 engines.

If your replacement heads are from a Normally Aspirated engine, you will need to block the VVT oil passages.

Here is some info about the Jaguar Cylinder Heads.

bob

 

I would not use the head bolts more than once. And the price of the genuine ones has come down from GBP 8+ to now 3+.

With regard to MLS gaskets, they require the block deck and the head faces to be almost perfectly flat and re-faced to very fine grain; otherwise they will leak, maybe not much but enough to cause slow coolant loss. Refacing the heads is easy but block decking requires complete engine strip-down and, if this is not done (and the block deck is no more than 0.1 mm out of flat) better to go with the standard OE composite gaskets.

 

At 3 GbP (each I presume?) thats probably a no brainer then.

 

Its a used car and I don't have a complete history of the car. Taking the bolts out it didn't seem like they had been removed before, but you never know for sure, for peace of mind i'm going to just assume they've already been used 3 times and just replace them.

 

heads are from and SC car

 

Torque to yield bolts, on any engine, are normally used only once. This is because, during tightening, they are brought into the zone of plastic deformation, i.e. stretched somewhat. If you use them the second time, due to their tightening by a fixed angle, they will be pushed further into their plastic deformation zone (stretched further) and brought closer to the breaking point - I wouldn't take that risk, especially not on a supercharged engine.

As far as I know, Jaguar initially specified only one use of the bolts. At some later point, they made a "concession" allowing just one more (second) use.

 

You can use FEL-PRO ES72262 bolts for both the Ford/Lincoln 3.9 and the Jaguar 4.0 V8.


bob

 

Thanks.
A quick search reveals 30 bucks on amazon, and free prime shipping, not bad!

 

So anyone got recommendation for gasket sets? Is OEM the only thing recommended or are there other cheaper aftermarket brands?

 

I have never found an aftermarket head gasket to fit the 4.0 V8 Jaguar. The 3.9 Ford/Lincoln gaskets WILL NOT fit the Jaguar 4.0.


bob

 

+1


The part numbers I have are AJ88987 for the RH bank and AJ88988 for the LH bank.
You need the Jaguar replacement. The Lincoln LS head gaskets are different.
I got mine from RM European for around $50 each.

 

Thank you.

I was hoping to just buy a whole gasket set and not have individually order each one separately.

 

That's the only way I have seen the head gaskets is separately.

 

I bought a genuine head gasket set (JLM20751) for my 4.0 SC from SNG Barratt at £300 but they also sell aftermarket (JLM20751*) at £145. Head gaskets only are: genuine NCC2541BC & NCC2540BC, £47 each; aftermarket NCC2541BC* & NCC2540BC*, £17 each.

 

hows the quality of those aftermarket?

 

The NCC's are the original replacement fibers headgaskets. The part #'s I gave you are for the MLS headgaskets that are recommended by several members on this forum.

 

I had the same question in mind - and I bought genuine; didn't want to take any risks on a supercharged engine. If for a 3.2 N/A, perhaps I would go with aftermarket. On the other hand, the fact that Barrat are selling the aftermarket ones provides some assurance of quality.

A couple of points regarding installation:

1. I presume that you will have the heads refaced, just a smallest amount which will make the faces flat and clean.

2. Get a good straight edge and measure the flatness of the block decks; if no more than 0.1 mm, it will be fine with composite gaskets (not with MLS).

3. Make sure that both faces, block and heads, are thoroughly degreased (Zippo lighter fluid works well, not petrol as it leaves some oily residue).

My block faces were about 0.1 mm out of flat (down) in the middle. I used a block of 10 mm thick glass with sandpaper (high quality silicon carbide, not just any) attached to it and, after hours / days of sanding the block faces, more on the sides and avoiding the middle portion, I managed to bring the out of flat to about 0.05 mm.

 

One more thing:

If you want to check whether the heads were skimmed before, measure their height - unskimmed head should be 131.00 mm high.