FBW

OK the head is off and what was remarkable was.....there was nothing remarkable !

What should i be looking for regarding a low compression reading on 2 pots ?

Bolts all looked good, 1 had a tiny bit of rust on, all were nice and tight.

1 pot deffo has a duff oil stem seal gone on the exhaust valve as you can clearly see it does not seal and oil is seeping down stem.

Other than that i dont really know what to look for ?

Any pointers....

On further cleaning.....The valve with the duff seal clearly doesn't seat correctly and is burned.

Also there is a small crack on 2 injector ports about 3 mil long, would/could this cause a low comp reading ? and does this mean a new head ?

Does the 4d56 head have the pre combustion chambers in the head??
Is this what you mean when u say injection port??

Quote: Mallinman wrote in post #29

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Does the 4d56 head have the pre combustion chambers in the head??
Is this what you mean when u say injection port??

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After a bit of reading yes it has pre combustion chambers and all of them have small cracks in !

I spoke to one of the lads at the garage and he said he had never seen a head without these cracks in and to just stick a new gasket, reground valves and it would be fine ?

Does this sound plausible ?

Would it be the same garage the fitted/ supplied the head?

Im no mechanic and know sod all about engines but that sounds to me like they are fobbing you off..i could be wrong though

Daz

Na the garage didn't do nowt to the head and after speaking to him more he suggested for the price of a new head to just go that way so it looks like i need a new head...

Ah right..as i said,i know how to polish a truck but dont have a clue about mechanics really so..sorry i cant confirm one way or the other

Daz