mill5y

Project escort, removed pistons and found some marks like valves had given them a kiss, 1 i could understand but all 4???
start with the head,
Bit dirty but no damage


Pistons after a clean-up with some neat petrol





All 4 marked in same place, no damage to head..... Has it had a snap and been revalved??????!!!!!!! Definatly not ment to be like that unleas they mchined them with a hammer and chisel because they are definatly knocked!!
Any ideas?? The valves are undamaged and the marks on pistons were all mucked up so guessing not recent, im pretty stumped as could be a number of wrong doings, head skim, gasket, wrong lift clearence, wrong pistons, wrong valves at some time.... Any ideas??

Joshy

looks like timing has been out at some point maybe? and its been fixed on the cheap...

steve4i

as above probs snapped a belt before and bent valves before due too crown down damage like that

gouch1

they have defo been in contact with the valves before and not changed

mill5y

With it only being one side would that indicate one cam was out and thus only one set of marks

Mark_

more than likely the timing was slightly out causing the valves to come in contact with the piston,

*Bri.4.b.Cos*

my money is on a previously snapped belt. If its a n/a motor then i'd make sure the valves are sealing ok and then just clean the burrs off the pistons with some emery tape and oil

Chaz888

As said timing or belt snaped could be the head was swoped out with a replacement ?

J1mbo

iTrader: (1)

Why if it's n/a any engine needs correctly seated valve not just a atmo one!

Rex Kramer

iTrader: (1)

Jim, I think the n/a comment was more to do with the pistons rather than the valves. As you say, all engines need the valves to seat/ seal correctly.

J1mbo

iTrader: (1)

Dosnt come across anything to do with pistons to me?

flannigan

iTrader: (1)

its over revving that causes this kind of damage mate if it were a timing belt failure the exhaust valves would have made contact too !!!

mill5y

Heads going in shop tomorow for pressure testing clean up etc, may get a bit of head work done while its in...

G420 DEL

my pistons were exactly same when i missed a gear! as said over rev!

*Bri.4.b.Cos*

could have been worded better but Rob got what i mean't, Go find some tech thread to nit pick in