Any Mechanics?

[Rabbithunter 456]

Recently had cylinder head re-build, the knob who done it for me put a gasket on that was too slim resulting in piston-valve contact.

 

He repeated the process a good three or four times, thinking it was because he had the timing out. THen relised about the gasket.

 

To "be safe" he fitted the correct size gasket (no.3) and also the slimmer gasket (no.1)... resulting in a larger piston-valve distance

 

Will this cause any problems, except for losing a bit of power?

 

cheers

[Guest ROOSTER]

if its lucky enough to seal it will alter the compression ratio and the combustion chamber is also increased it will result in a less efficent performing engine.

[Guest Scuba1]

if its lucky enough to seal it will alter the compression ratio and the combustion chamber is also increased it will result in a less efficent performing engine.

 

Plus it is more then likeley not going to last lung with 2 of them on top of each other :no:

[mooster 1]

When you say "cylinder head re build" what do you mean?....how much was adjusted/replaced?

Why was it rebuilt?

If it was because of a blown gasket and resulted overheating he may have had to skim the head to get ris of any warping caused by the overheating.

This is unusual but if carried out would need adjustment to the valve settings to stop them hitting the pistons.

To be honest it sounds a bit of a bodged job .

Having said that, depending on the age and performance of the car it should run ok.

If it's new, high performance or diesel it may well deteriorate as the head gasket/valve settings are more crucial.

Get a compression test carried out by someone a bit more reliable.If the test shows no leaks and performance is ok...no problem.(fairly quick and should not be too expensive).

Mooster

[Rabbithunter 456]

thanks for the info

 

Mooster, it had new valves, guides & followers. WHY? it just started running rough and conked out. Believe that 3 valves dropped

 

So it would be better to get someone to remove the head, and remove one of the gaskets, surely this is going to mean all new head bolts, costing around about £10 a piece. glad its only 4cylinder not 5.

 

No worries, i'll not be reccomending this mechanic to ANYONE which is a shame for him really, as theres usually always someone asking me if i know anyone to fix something. He hasnt even set the bloody timing right, the fuel pump is lagging behind.

 

When paypad comes i'll get it into a garage for a bit of a makeover. as far as i can now see its such a job :-

 

Remove cylinder head

Remove un-neccesary gasket

Replace head & possibly head bolts, 10 of.

Set timing

Carry out compression test

 

How much is all this likely to cost? Bearing in mind i am not entering the garage and knowing sod all (i believe if they think you dont know anythin, they charge more)

 

I'd been quoted £40 to have the van towed to an from the garage, and advance the pump. which seems pretty fair. But if all this work needs done, i guess theres no point in getting the pump advanced at this stage.

 

 

Saying that, i've had the van running a few times for about half hour each time, apart from it sounding rough as a badgers arse (due to fuel pump lagging behind) it runs fairly fine

Edited July 14, 2007 by Rabbithunter

[timmy k 592]

right, im a mechanic of 10 years and firstly ill tell you this ive never heard of pistons hitting the valves due to the wrong thickness of gasket being put on its impossible the engine just doesnt work that way, secondly putting 2 head gaskets on is the stupidist thing ive ever heard, it just wont seal end of story.

also skimming the head is not unusual, alloy heads warp all the time and need skimming when ever over heating has occured but the block which is usually cast may need skimming in extreme cases, but be warned their is only so much you can skim of a head before its deem as f****d.

it sounds to me as if this tosser hasnt timed it right ,started it up and THAT has cause the valve to piston damage not the gasket but thats what hes told you so he doesnt look a total wanker, that in turn has caused you to need new valves and by the sound of the job hes performed its going to need doing again, and i see that it does, as for the head bolts the reason they may need replacing is cause they stretch, certain manufactures has set measurement for these bolts and you can some times get away with using them again.

good luck finding a better mechanic but some may be reluctant to take on someone elses botched up job (i wouldnt touch it with a barge pole)

[bill88 6]

Most modern diesels run very close piston to valve clearance,should the head need facing,then thicker gaskets are available.Most are identified by notchs cut into the outer edge,the more notches the thicker it is.Might be working as a navvy now,but served my time as a mechanical engineer/machinist.Two gaskets is a NO,NO.