impreza wrx82

Just put engine back together after changing head gaskets, replaced the oe ones with steel which were a lot thinner, started it up and there is knocking could this have something to do with the gaskets?
Thanks

scooby2a

what was the original symptoms of the car before changing the headgaskets if any symptoms

StudentScooby

Surely you wouldnt change the head gaskets just for the hell of it!?

impreza wrx82

the rad went and it had overheated

jaytc2003

iTrader: (1)

did you skim the heads as well?

impreza wrx82

yeah the heads were skimmed could this be the problem?

Lebarron

Did it drop the oil when the head gasket went. If so it may have damaged the big end bearings causing it to knock, which is what happened to mine so i had to rebuild the engine.

impreza wrx82

no the oil was still fine before i took the heads off it would still run and sounded fine only problem was when it got up to temp the heaters would go cold then start to overheat.

impreza wrx82

gona take it out again tomorrow, is there any way I can tell if it is bottom end when I have got the heads off?

jaytc2003

iTrader: (1)

if the heads were skimmed and you are now using thinner head gaskets as well then........

impreza wrx82

could the pistons be hitting the valves?

Lebarron

You wouldn't be able to tell if it was the bottom end without stripping the whole engine down, but you can generally tell by the sound of it as it is a definate loud knocking sound. I can't imagine that anyone with any sense would skim so much off of it that tthe valves are hitting the pistons. Is possible though especially if you have used thinner head gaskets. You should really be using thicker ones if anything.


Is the cambelt definately timed up right with all of the marks in the right place, because they could be hitting if the cambelt is a couple of teeth out.

impreza wrx82

timing is def ok