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[Marks DTM Calib]

The V6 estate started running rough last week.......DIS pack faulty (on 4 cylinders).

Fitted new dis pack and its now running on 5 cylinders

Anyway, did a compression test to find it low on number 3 cylinder so off with the inlet and cam covers.

Now the heads are VERY clean, as if they have been re-built at some point possibly following cam belt failure?

Well, which ever idiot cleaned and re-built them has done a shit job........they clearly didn't replace the valve stems as one has cracked and the inlet valve is stuck open. Its must have been 'professionally' done as the heads have been chemically cleaned.

What a Muppet, so its heads off time an fit a spare pair.

Moral.....never, despite what any body else tells you, replace only the valves following cam belt failure.....it wont work and is dam right stupid.....

[Markie]

so how much time to you think that will take you to put right Mark?

[TheBoy]

knwoing Mark, about an hour  

[Marks DTM Calib]

Started re-building a pair of heads already but, they are filthy.....they have had an additive in the oil ...

[omegaV6CD]

The V6 estate started running rough last week.......DIS pack faulty (on 4 cylinders).

Fitted new dis pack and its now running on 5 cylinders

Anyway, did a compression test to find it low on number 3 cylinder so off with the inlet and cam covers.

Now the heads are VERY clean, as if they have been re-built at some point possibly following cam belt failure?

Well, which ever idiot cleaned and re-built them has done a shit job........they clearly didn't replace the valve stems as one has cracked and the inlet valve is stuck open. Its must have been 'professionally' done as the heads have been chemically cleaned.

What a Muppet, so its heads off time an fit a spare pair.

Moral.....never, despite what any body else tells you, replace only the valves following cam belt failure.....it wont work and is dam right stupid.....

Sorry to hear that, it seems like a traditional main dealer cost saving approach to a problem.
See the positive side that now you can get everything serviced, relap valves, port heads, etc.

[TheBoy]

ex plod ain't it? Do you reckon it was bodged during its police life, or afterwards?

[Admin]

It was most likely done during its police life due to the cost (private owner would be unlikely to pay that amount).

Annoying, but at the end of it Mark will have an engine even he is satisfied with!  

[Tezray]

I like the way removing the heads and re-fitting them is no big deal for Mark   It was a bl00dy big job for me!!

Does sound like a bodge, i got mine right down to a tee, although now my manifold bolts have worked loose and it's blowing and i feel like the torching the bloody thing  

[Marks DTM Calib]

Lol....head gaskets are not to bad a job on the V6

The plus point is the exhaust manifold gaskets needed changing anyway!

[Tezray]

Well make sure you use new exhuast manifold bolts, or do the current one's up nice and tight  

[RonaldMcBurger]

Taking the heads off won't be such a big deal really. Once you have the plenum, inlet manifold and cams out, it is reasonably easy. Just a pain to have to do. Luckily we happen to have a spare set of 3.0 heads, which are in great condition, so he can get this sorted quickly I hope.

[omegaV6CD]

I like the way removing the heads and re-fitting them is no big deal for Mark   It was a bl00dy big job for me!!

Does sound like a bodge, i got mine right down to a tee, although now my manifold bolts have worked loose and it's blowing and i feel like the torching the bloody thing  

To avoid bolt relaxation you need either multi stage torqueing or you need to check the spec of the bolt and give it the maximum it can take, eg if it is an M8 8.8 grade the maximum is arround 28NM. In any gasketed joint bolt relaxation occurs after so many themral cycles.

[Marks DTM Calib]

Not had much time to work on the lump today as we have been out to the local kite festival.....

Did manage to get the heads off though..............and this is a shot of the little bugger....



You should just be able to see a section of valve guide on the valve stem, the other piece has been through the engine and knocked a few dents into the head face and the piston crown.

The ones on the piston crown are not to bad and there appears to be no bore damage so I will polish them out.

[Marks DTM Calib]

On closer inspection it looks like one of the other inlet valves has also been leaking slightly.

The spare heads are being stripped and new stems seals will be fitted following a good clean and valve re-grind.

Then its assemble and fit, should be running late Saturday afternoon.

In the mean time its bus and train for me to work which, is actulay nice because its different but, it does cost more!

[Marks DTM Calib]

Ok, one head stripped and cleaned, valves cleaned and checked, valves lapped in.

Now need my headgasket set to turn up (82 quid with bolts delivered) so I can fit the new stem seals and re-assemble ready for fitting.

If it doesn't arrive today then head number two will be stripped and cleaned as per above.....