Cometic MLS head gasket on an XU9J4

[Andy 105 1 Cars]

Despite a search, I have not found much on here regarding the use of an MLS head gasket on the  xu9j4 engine. Sweet badger used  a really thin one on one of his engine builds to increase the c.r. My question is about how much liner protrusion to use with such a gasket. I understand that the wet linered Rover K series engines often use an MLS gasket with 3 thou protrusion , but that is a different engine constructed differently . The motive by the way for a Cometic is that the bore is 85mm so standard gaskets will not do

cheers. 

Andy

[B1ack_Mi16 67]

What about a standard XU10 gasket? But they are maybe 86mm++ ?

 

Not sure about suitability of the cometic on alloy block.

[Andy 105 1 Cars]

Yes. 86mm would be o.k, but are the xu10j4 gaskets  not MLS as standard? 

[B1ack_Mi16 67]

XU10J4RS I believe at least is MLS.

But not the XU10J4 I think. 

 

But I guess it is not 86mm exaclty, more like 86.5mm or so.

https://www.ebay.com/itm/Dichtung-Zylinderkopf-AJUSA-CITROEN-ZX-XANTIA-PEUGEOT-306-405/122094350544?epid=1804317438&hash=item1c6d63f0d0:g:ydsAAOSw8HBZMYp-

[petert 586]

0.003"

[Andy 105 1 Cars]

Thank you. Very helpful Peter as always. Any yes I am Cycling, but Garmin is not uploading, so I have become a closet turbo/track rider who is too nesh to venture out on icy roads

[petert 586]

Very lean here too. We had 44 deg two days in a row. Worse than rain.

[SweetBadger 94]

Hi, yes, I used one on a almost standard engine to good effect. (inlet camshaft and manifold were the only mods)

 

i was replacing the valve stem seals on the engine, so just bunged in the cometic gasket when I put it back together (no head skim, just a tidy up and clean).

 

I didn’t check the liner protrusion at the time, and the gasket did eventually go between cyl 1 and the the water jacket (after three years of hard use inc a number track days). So I’d definitely recommend ensuring the liner protrusion is spot on, and that the head has the correct finish for an mls gasket if you use one.

[Andy 105 1 Cars]

 Cheers. Thanks for that . So with care , should work well . Nice to have an option of both mls and composite given that both need similar liner protrusions 

 

[welshpug 1,657]

you could drop brett sims a line, i have heard of an 85mm bore mi16 he built for a guy i know in mid wales.

 

wrc engines were an 85mm bore alloy xu as well.

[Andy 105 1 Cars]

Thanks for the information. Will do.