[Mk2] [Turbo] why did my 2 overheat?

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swaggansway

[Mk2] [Turbo] why did my 2 overheat?

Post by swaggansway »

I was nailing along and all of a suden I heard a loud noise like a constant horn from behind my head! I pulled up n the whole car was engulfed in steam.... I xxxx it an legged it behind a wall in fear of a explosion (dramatic ain't I). anyways.....as it had overheated and that I also had compression issues with the usual cylinder I decided a full refurb was in order! I found that the reserve coolent tank had blowen the cap and pipe compleatley out (toys outta the pram lol), the pipe directley under the dizzy (covered in oil from leaking dizzy o ring)the one which comes from the hard pipe hfhoe and loops back onto the block, was off! when I moved it loads of crusty rusty shizzle flopped out!

I still don't know what caused it tho...my thermo is working fine as is my water pump :

my car has always used tiny amounts of water and I assumed the pressure cap was leaking...a week before it gave up I notised rusty stuff floating up in the filler tube, I assumed head gasket but when removed there was no evedence of it blowing.

the morning of my engines demise I did a oil and filter change

any ideas fellow 2 owners?
djpkins
Posts: 2326
Joined: Thu Apr 30, 2009 7:13 am
Location: essex

Re: [Mk2] [Turbo] why did my 2 overheat?

Post by djpkins »

If the head gasket was ok then the engine must be getting pressurized somewhere else..could be that your block is cracked mate, inbetween the pistons...unfortunately, if that is the case, it's a dead engine Angus. Did you put a different head on it or re-use your old one, did you get the old one skimmed before re-fitting or indeed the replacement...sometimes the block has to be "decked" aswell...skimmed...you didn't give it too many beans before re-torquing the new head bolts did you...and did you make sure that all of the valves etc went back in their original places...if the head was skimmed by quite a lot you may have to use a thicker head gasket to make up the difference...I'm feeling your pain Angus...but when all is said and done, you will be a top boy and it's a great feeling when you can do all your own mechanics...I may be able to supply you with a rev 3 turbo block, with no issues at all, but I don't have the head assembly to go with it unfortunately mate.
swaggansway

Re: [Mk2] [Turbo] why did my 2 overheat?

Post by swaggansway »

I haven't finnished the rebuild yet dave....this is my origonal issue, I am still bloddy lapping valves....I can't see any cracks in the block nor can the man from the engine shop! :-k
pbmr2
Posts: 929
Joined: Fri Jun 18, 2010 12:49 pm

Re: [Mk2] [Turbo] why did my 2 overheat?

Post by pbmr2 »

blocked radiator?

my rad had a tiny pinhole leak in it.. i never spotted it till i was under the car doing something else. just a tiny amount of coolant was dripping from the rad. like a single drop every 30 seconds.
took the rad out and flushed it, turned out to be about half blocked. loads of crap came out but after that it leaked from about 5 places.. new rad time.

how do you know your water pump is working fine? have you checked for leaks around the pump? have you seen the pump blades are still there?

i also found a leak in the pipes from hell. again a very small leak that looked like it had been leaking for some time, i replaced the whole pipe.

hope this gives you some ideas of where to look.
good luck
swaggansway

Re: [Mk2] [Turbo] why did my 2 overheat?

Post by swaggansway »

yep....my water system was 50% crud. this started moving as I was thrashing her and blocked every little pipe and hole up :whistle:
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