Blown head gasket agian....

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iannotts

iannotts

New Member
Posts
4,401
Location
East midlands,
ok why the fook has my head gasket blown after a few thousand miles again???

not been running rough or hot.

The last gasket was a bearmach one

all ideas welcome
 
iannotts said:
I will i'll use my own this time :p
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Was your head flat, and do yourself a favour make up a couple of dummy studs, it holds the gasket in place and makes it so easy to refit the head without damaging the gasket.

Look carefully where it blew then look for the reason. Make sure there are no dips in the block particularilly where the flame rings sit, get a steel ruller, a big fooker and lay it across all the areas, use a torch and look for light shining through, both the block and head.

It was the correct gasket?? the right way up.
 
lrb2 said:
got to be worth a trip to a good engineers to have it checked / skimmed .
Click to expand...

I would think that's a good idea, need to take out all the valves tho.

Like to know where it blew for interest, and it's good experience for him to check bits with the steel rule, however he wont have the eye for the tricky bits perhaps like cracks etc but hopefully the gasket will throw up something.

A check of the block is also a good idea, making sure it's flat but also that there are no cracks at the top of the liners, little tiny fookers that open up when its running.
 
iannotts said:
yes to correct gasket and right way up.

Not sure how flat the head was/is will have to check when i take it off again.
Click to expand...

Just a couple of things that come to mind, if they are stretch bolts make sure they are not bottoming out in the bolt holes.

I always blow out the holes in case there is **** in them oil water etc, since this gives an incorrect torque, and you can crack the block.

I think it's an angle torque head, pre-load it then angle it. I normally use tipex on the bolt heads, then romp them up from the centre outwards.

I think you know all that stuff though.
 
david451 said:
I always blow out the holes in case there is **** in them oil water etc, since this gives an incorrect torque, and you can crack the block.
Click to expand...

Same here, all though if you've got a good tap set its not a bad idea to run it up/down the threads a few times either.
 
slob said:
yer mean yer changed a HG without checkin if the block and head wur flat???
Click to expand...


yes, i had to get it back together come what may so wasn't worth checking.

Got the head off now and offered a plate of glass upto it. So far doesn't look like its a banana but will check more tomorrow.

As for the stretch bolts. If the head is flat so not need to come of again can I swap these after all is assembled and running as I didn't realise that they were ment to be replaced every time the head came off.

got an elring gasket this time, hope it not just a temporay job as I need it back on the road for monday to get to work.
 
iannotts said:
yes, i had to get it back together come what may so wasn't worth checking.

Got the head off now and offered a plate of glass upto it. So far doesn't look like its a banana but will check more tomorrow.

As for the stretch bolts. If the head is flat so not need to come of again can I swap these after all is assembled and running as I didn't realise that they were ment to be replaced every time the head came off.

got an elring gasket this time, hope it not just a temporay job as I need it back on the road for monday to get to work.
Click to expand...

It's always worth checking, it's a standard part of the job

Glass is fookal use, it aint flat, steel ruller.

I use the bolts again on the trucks, occasionally one breaks but it comes out ok. Need to take the head off though and it's usually the last one that breaks

Once it's torqued thats it dont take any bolts out again.

And unless you intend to work for mclarren then slow down and fokin do it right, the way you are going at it you are going to be the fastest gasket fitter in the country. What use is there fitting it together if it blows again on Monday.

Is the head flat, and I gave you the method to check it. Get down to B&Q and get a 2ft steel ruller. Who told you to use glass, even the stuff thats made on a bed of mercury is bent.

Where did the gasket blow, you need to check that area in particular for cracks etc, is one of the combustion areas, pistons a different colour from the rest, if so then it's probably this area the gasket went.

If the head is warped then calm down and get it machined, get somebody to pick you up, phone in sick or sumut and get it fixed properly.

Make sure there are no small cracks in any of the liners at the top, if there are the engine is fooked, so no point puting the head back on.
 
david451 said:
It's always worth checking, it's a standard part of the job

Glass is fookal use, it aint flat, steel ruller.

I use the bolts again on the trucks, occasionally one breaks but it comes out ok. Need to take the head off though and it's usually the last one that breaks

Once it's torqued thats it dont take any bolts out again.

And unless you intend to work for mclarren then slow down and fokin do it right, the way you are going at it you are going to be the fastest gasket fitter in the country. What use is there fitting it together if it blows again on Monday.

Is the head flat, and I gave you the method to check it. Get down to B&Q and get a 2ft steel ruller. Who told you to use glass, even the stuff thats made on a bed of mercury is bent.

Where did the gasket blow, you need to check that area in particular for cracks etc, is one of the combustion areas, pistons a different colour from the rest, if so then it's probably this area the gasket went.

If the head is warped then calm down and get it machined, get somebody to pick you up, phone in sick or sumut and get it fixed properly.

Make sure there are no small cracks in any of the liners at the top, if there are the engine is fooked, so no point puting the head back on.
Click to expand...

getting someone to pick me up aint that easy i live 5miles out of the way to the nearest person,

the casket blew from clyinder to water chamber between 3 and 4

All the pistons are the same colour, was a little bit of water around, since it blew into a water chamber guess this was to be expected.

glass not being flat .. I beg to differ ;)

like i said yea it is a standard part of the job but .....

what is the maximum alound warpaing in thou?
 
iannotts said:
getting someone to pick me up aint that easy i live 5miles out of the way to the nearest person,

the casket blew from clyinder to water chamber between 3 and 4

All the pistons are the same colour, was a little bit of water around, since it blew into a water chamber guess this was to be expected.

glass not being flat .. I beg to differ ;)

like i said yea it is a standard part of the job but .....

what is the maximum alound warpaing in thou?
Click to expand...

You blew the flame ring out then, the ring in the centre of the gasket, it's obvious then? thats a bad sign.

Glass is no use trust me, I dunt know anybody who uses glass, get a steel rule or fook it up again. One thats long enough to go end to end 2ft.

In your case lets just find out where it's warped and how bad it is, that there is no cracks, and that the block is flat. This is the important bit, dont do it then you are wasting your time.

If you dont have the time then why waste time taking it off if you cant fix it, you are only making it worse. At the absolute min I would say its a head machine job, better hope the blocks not fooked.
 
yea, there is a gap in the flame ring from number 3cylinder (same clyinder where it went last time).

One thing I did notice, when I tightened the head bolts up list time. 40nm then 60 degrees then another 60 degrees they seemed fookin tight yet when i undid them they wernt tight but not F/Tight.
 
iannotts said:
yea, there is a gap in the flame ring from number 3cylinder (same clyinder where it went last time).

One thing I did notice, when I tightened the head bolts up list time. 40nm then 60 degrees then another 60 degrees they seemed fookin tight yet when i undid them they wernt tight but not F/Tight.
Click to expand...

The gasket will have flattened out a bit with the heat, but check the lenght of your bolts with a new one in case they have stretched.

You know where to look now, block flat, no crack, head flat.

Rule along the length with a light at the other side, your head is fooked I hope, and not the block. If it blew a chunk out then it's well warped.
 
WHAT, WHAT WHAT'S THIS,? hgf in a tdi, snigger,
No offense to the OP and I hope yer head is within tolerance, but this thread is gonna get milked. Where
is Pikey when you wanna give him a slagging.
Brass neck saying k-series are crud buy a tdi,
 
Northern Irelander said:
WHAT, WHAT WHAT'S THIS,? hgf in a tdi, snigger,
No offense to the OP and I hope yer head is within tolerance, but this thread is gonna get milked. Where
is Pikey when you wanna give him a slagging.
Brass neck saying k-series are crud buy a tdi,
Click to expand...

worra ****

how often do ya get someone on ere talking about a Tdi with a HG problem ?

how many times do ya get peeps on here thinking about scrapping their hippo cos it's using more water than fuel ?
 
GOING BACK ON TOPIC:|

does anyone know the lenght of an unused head bolt?

done a bit of hunting

does:- 125mm, 100mm, and 117mm sound right? (3 different lenghts)
 
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