compression

[ant_tay]

can anyone tell me what the compression should be on the later XE and what the tollerences are please because i have a miss fire on cyl 1 i dont think it H/G because i got no sludge and i drove it about 60 miles like it so im thinking valve stuck open, burnt valve, pisron rings any other sugestions would be great thanks

[let_nova]

160-200

[ant_tay]

psi i take it

[let_nova]

yes mate

[ant_tay]

cool will be testing it tomorrow

[Rich]

No sludge doesnt mean your headgasket hasnt gone, oil and water dont always mix

[Will F]

Headgasket would be the easiest thing to fix too - even taking the plugs out can pretty much tell you whats up with it....

[ant_tay]

the plugs are clean and dry

[--ToM--]

iv blown head gaskets between cylinders before! no creamy oil etc just a bad missfire

[ant_tay]

ok i did the compression test and all cylinders came out very close to 200 im stumped now so i have taken off the injection rail and injectors to clean them put them back on but number 2 injector hasent sealed so go to do it again and i got loads of crap out of them

any other suggestions would be great i realy am stumped now

[ant_tay]

well after all the fucing about i have now found out it is the head gasket i can see the cream strating to form on the oil cap its very light at the mo though

[Will F]

well after all the fucing about i have now found out it is the head gasket i can see the cream strating to form on the oil cap its very light at the mo though

What are the actual symptoms? Yopu somtimes get a bit of emulsification (mayo) when you run it for short periods...

if it was h/g - you would know about it!

[ant_tay]

its got a miss fire which if you give it some you can feel that one cyl kick in and out realy quite hessitant but the compression on each cyl is very close to 200psi and i have noticed a drop of water level in my header tank

[Stuart]

when I test drove a certain XE'd nova it had a misfire... turned out to be a combo of HG and cracked (not porous)ness.

[ant_tay]

when I test drove a certain XE'd nova it had a misfire... turned out to be a combo of HG and cracked (not porous)ness.

im planing on doing the head gasket (thats what i think it is) and ill get the head presure tested just to be on the safe side

[Stuart]

imho if its not a costcast head I'd do the crack repair anyway even if its not gone.

Pressure testing isnt exactly cheap :s

[novaxe235]

They usually crack after being re-fitted/torqued down anyway, so as above get the head sleeved if its coming off anyway.

[ant_tay]

They usually crack after being re-fitted/torqued down anyway, so as above get the head sleeved if its coming off anyway.

may sound stupid but what do you mean by sleeved

[Stuart]

search here or mog for joff's porous head fix.
might even be in the articles section.. (if not then find the png link and I'll stick it in)

[Southie]

Heres the MIGCLICKY (http://www.migweb.co.uk/forums/engines-transmission/340906-thought-id-have-go-porous-cracked-head-modification.html#post3505511) of Joffs porous article. :thumb: