Hi has any one ever had a head pitted in and around the valve area and head gasket sealing ring area?

These heads have been skimmed before..

Can the head be skimmed and still be within tolerances even though there are worm hole pitting! I have heard some people have had to have the valves seated further in??

Depending how bad it is, replacing the valve seats will probably solve the pitting around the valves. Pitting in the face of the head can be aluminium welded and re-skimmed.

 

Baz

Depending how bad it is, replacing the valve seats will probably solve the pitting around the valves. Pitting in the face of the head can be aluminium welded and re-skimmed.

 

Baz

The valve seats are fine! I have reground them today.. the pitting is in the combustion chamber near the valve seats but not on them!

I have never heard of anyone welding the heads normally if a head is bad and cannot be skimmed any more.

Pitting is more than likely caused by detonation. The pitting itself isn't a real problem - as long as there's no sharp edges - these will glow red hot and cause detonation....

Pitting is more than likely caused by detonation. The pitting itself isn't a real problem - as long as there's no sharp edges - these will glow red hot and cause detonation....

But my main concern is round the gasket sealing ring, i would guess at least 1mm deep and round and around 7 of them!

As long as its not actually on the sealing area it should be ok ;) You only get 1 skim out of VG30 heads usually...

And they have had one skim already by the previous owner when he had the head gasket go and piston ring breakup on number 2

As long as its not actually on the sealing area it should be ok ;) You only get 1 skim out of VG30 heads usually...

If you line up the head gasket the sealing ring sits on some of the bigger pits:(

The coolant seating part of the head near number 6 has erroded badly due to leakage

Can't understand how its pitted under the sealing ring :confused:

Nor can i unless it had a leak under the ring! the block is ok

But the leaking wouldn't cause it to pit I'd have thought. I might have some heads knocking around somewhere if you need to replace... Could you not get away with a larger bore HG? You would have to run bigger pistons but thats one way out I suppose...

But the leaking wouldn't cause it to pit I'd have thought. I might have some heads knocking around somewhere if you need to replace... Could you not get away with a larger bore HG? You would have to run bigger pistons but thats one way out I suppose...

Pics but not very clear as its dark :D

The pics above are after the head gasket area has been cleaned and lightly wet and dryed!

The little black dot's near the Gasket ring area are the pits

Hmmm can't really tell from the photo's bud. If in doubt take them to your local headshop. They should give you an accurate opinion ;)

Hmmm can't really tell from the photo's bud. If in doubt take them to your local headshop. They should give you an accurate opinion ;)

andy do those heads on ebay that have been recon'd anything to do with you, just curious as it says location= preston] :cool:

andy do those heads on ebay that have been recon'd anything to do with you, just curious as it says location= preston] :cool:

There are some N/a heads on there too!

Greg are they compatible or do they have different combustion chambers and valves,Cams

Is it me or does that look like a crack going through the combustion chamber?

 

And did it have antifreeze in the water cos that looks alot like corosion around the water jacket.

Is it me or does that look like a crack going through the combustion chamber?

 

And did it have antifreeze in the water cos that looks alot like corosion around the water jacket.

It never had antifreeze in it when i bought the car a couple of years ago. i know the car had not been looked after before i owned it from various other taletale signs :confused: ! I had to flush the Engine four times to get all the rusted water out and crap out!

I had four core plugs rust through nearly two years ago after that!!

Then i pressure tested it and put antifreeze/water back in with some water wetter!

And i found out a few days ago that the radiator is still clogged at the bottom!! at least 5 rows and i cant use the drain plug where its so bad! :confused:

 

It is not a crack in the combustion chamber it is a machine line from when it was previously skimmed! I could tell it had been skimmed and had a head gasket done on the car before as they had damaged at least three of the head bolts tightening them and not having the tool in the head bolt correctly causing damage inside the top of the bolts.. :(

I will get some better pictures today in the daylight! I dont really want to waste time taking these to a machine shop that i have used regulary as i have a feeling he will say dump them:(

New pics (Much clearer) Click on image for larger view :)

If you look at the pics above this is Exactly how the head looked as soon as i removed it! all i have done is cleaned it up and reseated the valves except Number 6's exhaust valves as they are bent from the piston being hit upwards after the small end gave way? I am a bit cuious though to the damage to the combustion chamber as the top of the piston was hardly damaged yet the combustion chamber is badly marked??

Unless this is previous damage from before i owned the car and thats why the engine was stripped before?? (note the spark plug is i real goog condition still :confused: )

Here's the top of number six piston! (One before clean & one after) apart from valve damage there is not much damage to the top unlike the head! Maybe its detenation but i always though the plug would suffer first then the piston then the Head! maybe its the other way round but only number Six has suffered this so maybe i have a faulty stock injector??

No Greg its not me selling those. Not sure who it is tbh.

 

Andy, looking at those pics I'd say that head is scrap m8 :( TBH it looks like its been taken too far on the skim previously. Is the model number still present on the underside? Apart from that, the amount of damage to the combustion chamber would suggest a dropped plug at some stage. I wouldn't use that head again (all IMO of course ;) )

No Greg its not me selling those. Not sure who it is tbh.

 

Andy, looking at those pics I'd say that head is scrap m8 :( TBH it looks like its been taken too far on the skim previously. Is the model number still present on the underside? Apart from that, the amount of damage to the combustion chamber would suggest a dropped plug at some stage. I wouldn't use that head again (all IMO of course ;) )

Cheers Andy Nice to see you are still around ;) How come you are now only a registered user!! or would you rather not say :D