how (if possible) would i be able to tell the difference between a pooped head gasket and a porous head?
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how (if possible) would i be able to tell the difference between a pooped head gasket and a porous head?
A porus head will tend to gunk the header tank with oil. Headgasket normally goes the other way and contaminates the oil with water, or pressurises the water system.
unfortunately you have to get the head taken off & pressure tested
UH.... OHH........Quote:
Originally Posted by Lee
http://i69.photobucket.com/albums/i4...d/DSC00345.jpg
http://i69.photobucket.com/albums/i4...d/DSC00343.jpg
As per Lee's post ^....... We have a winner :DQuote:
Originally Posted by Lee
Nasty :(
Is it a Gm head?
D'oh :(
**** FCUK BOLLOCKS!!!!!!!!!!!!!!!!!!!!! (appologies for the language)
yup it 'was'.... coscast here we comeQuote:
Originally Posted by Adam
If you cant get your hands on a Coscast, source a normal head, get it pressure tested and it should last AT LEAST 50k miles+++
i want to eliminate the word 'should' and replace it with 'will' so im affraid coscast is the way forwardQuote:
Originally Posted by Mike
Just get a gm head and have a sleeve fitted to stop it cracking again.
Or have it done to your current head
Thought this car had already had the head done?
Yeah i'd go for a repair too.
you take the head off.Quote:
Originally Posted by conad
there is no other method in finding out with the head on. either head gasket failure or porus head could give you water/oil emulsion depending on whether the gasket has failed between an oil way and water jacket, between oil jacket and bore, or bore and waterjacket. (or any combination)
i dont think you have considered a blown core-plug. this would allow the head to allow water to mix with oil in the rocker cover and the water jacket in the head. the emulsion you have in your tank is very severe. you should look at all possiblities before rushing out to buy a head!!
cav16 (google), on mig there is also a thread by joff_nova about fixing the "porous" issue.
by the way its NOT sodding porous, its a crack. 100% different issues.
I can get the head repair profesionally done sleeved etc for around £100 considerably cheaper than the £300 odd you would pay for a coscast and there is much less faf as you don't have to swap everything....PM me if anyone is interested i had mine done as a precaution and its a top job!
£100..... for £5 of bar and 10 mins with a drill........ foooooking ell thats a rip off.
/\ you get a pressure test and the drilling is done on a cnc machine plus a garantee and it wont be a fu=king bodge job by some chump lol lol lol
ahhh the good ole sales tactic of "it wont be a bodge" to try and justify it.
Is the guarantee only valid if they refit the head? If I were an engineering firm I wouldnt guarantee a repair like that unless I had refitted the head too.... too many variables in rebuilding the engine to just blame the repair job ;)
joffs thread on mig
http://www.migweb.co.uk/forums/engin...ification.html
The nature of where the GM head fails means it will always blow oil into the water system. If you have oil in the water you can pretty much guarantee its a cracked (porus) head. Ive never seen a blown headgasket do the same thing if it goes across and oil/water gallery, invariably it'll gloop up the oil, or do both, but not just gloop the water.Quote:
Originally Posted by meritlover
The scenario you mention about the core plug doesnt add up as theres no water in the oil as far as we know :thumb:
Sorry for trying to offer a solution to a problem do it how you want it won't make any difference to me if it goes wrong, i'm sure your diy method will be fine. lolQuote:
Originally Posted by Stuart
not my DIY method :p
but certainly £95 cheaper than yours.... esp as there isnt any need for drilling lol
Quote:
Originally Posted by Lee
Ive seen head gaskets go both ways, you can also do the head gasket without mixing oil an water. So many different ways they can fail, however if the head cracks it will go into the header tank as you say, but the gasket can also do that as well.
99% of the time it will be the head an not the core plug, these engines dont usually core plugs its very rare they do.
You'd have much more experience seeing stuff like that than me :) But id still be surprised as the water is under a load more pressure coming up the block so it would have thought it would normally force its way into the oil at this point, rather than vice versa.Quote:
Originally Posted by Philsutton
Agreed its not a foolproof diagnosis though lol
Does it work?Quote:
Originally Posted by Stuart
have you even looked at the link?
Sorry i thought you had tried it....