So after my compression test on no.4 showing nowt (and fearing the worst!) I found it was only an exhaust valve thank fook! bottom end got away with it as well





Should be running in no time

 

Bottom end still looks good, i'd replace all the valves if I were you tho

 

not too much money to fix then.

 

Thats a relief then for you mate, some good news for the cossie crew for a change, we always seem to get it bad

 

thanks guys!

Cant replace all valves, in the middle of movin and Proper skint!. Going to fully de-coke it, replace stem seals and a new set of lifters though . . .

 

Meant to ask as well, why would it have burnt a valve?

Im guessing slightly stuck open and constantly having hot exhaust gases on both faces?

 

probably not seating properly (they disperse a lot of heat through the valve seat) so it got very hot!!

 

Any dents in top of piston
May have just kissed the piston if overrevved and got a bit of a kink in it
Put it in a drill and give it a spin should tell u
I would deffo change all the exhaust valves though
If a head falls off it will destroy the engine and turbo...

 

as said, replace valves!! might cost you to do so, but think what it'd cost to replace the engine if it went pete tong

maybe someones got some cheep 2nd hand valves?

 

Very lucky.

 

No dents in top of piston, just think 140k of being a cossie exhaust valve may have been to much for it

Will spin it just to see though.

 

will dents in the piston give it any grief???? Mine has 8mm long and 5mm long nicks where they have touched.

Graham

 

as long as no bits come off .. . . No.

Just get valve cut outs machined

 

when you say get the cutouts machined what do you mean? My pistons are like yours and dont have cutouts, just the stepped bit. Do you mean smooth them off to make sure there are no high spots which will result in hotspots?

Graham