The car is a 1973 Mitsi Galant GTO, 2.0 Astron 4 cyl motor with a weber twin carb, electric fuel pump. All of a sudden the car started to run real rough. Smoke poured out the exhaust, especially when stopped. Then I looked closer.the smoke from exhaust actually appears to be coolant (sweet smelling) which fogs up a mirror when placed close together. I also noticed that under the bonnet the 3rd cylinder was bubbling liquid around the spark plug (coolant again). Nothing is leaking into the oil, the oil is fine. Coolant is leaking into one of the cylinders.Now.could this be a cracked head! or just a blown head gasket! What else will need to be fixed besides this.piston rings in the leaking cylinder! Thanks
ginga4lyfe,
Apr 14, 8:59am
more than likley a blown head gasket, if its a open deck then its very likley Im not sure about the head cracking, you can only open her up to find out, and if there is no fluid in the sump then i wouldnt worry about your rings
pcguitarist,
Apr 14, 9:01am
Thanks ginga4lyfe
carkitter,
Apr 14, 9:11am
Cracked heads were common on 70's - 80's Mitsubishis - that'll be the cause. They crack between the water jacket and the spark plug hole just as your's sounds like it has done.
Don't rush to put it back together, take your time, get it modded professionally and you'll have a fast and seriously desirable car in your possession.
phillip.weston,
Apr 14, 9:15am
yes I woudl agree with the above, the old Astron series is known to crack heads, but more so in the 2.6 where the spacing between bores is smaller. Hopefully you can find a 70s 2.0 Sigma engine somewhere to rob the cylinder head.
msigg,
Apr 14, 4:30pm
Probably caused by corrrosion between the gasket and head or block, or could be cracked head. If it wasn't over heated i would say corrosion, either way it has to come off and checked. Good luck.
jash3,
Apr 14, 4:50pm
Good luck with that.
phillip.weston,
Apr 14, 4:54pm
it's ironic they are never around when you need one the most. I was so sure the user 'mike107' here had a 2L astron spare which was listed on trademe, probably long gone by now.
plasticboys,
Apr 14, 4:57pm
is there a frost plug in the the block! may of roted through
phillip.weston,
Apr 14, 5:03pm
^^ that would just cause a coolant leak outside of the block, the fault the OP is having is coolant is getting into the combustion chamber, and also is collecting around the a spark plug which strongly suggests a cracked head as they tend to crack between a valve seat and the spark plug hole.
pcguitarist,
Apr 15, 7:02am
Thanks for your opinions everyone, I'll be taking it in to the garage tomorrow to check it out.
mike107,
Apr 20, 8:06pm
The GTO 4G52 Head cracks between the valves of No.3 cylinder, the crack then works it's way right up into the head. Never pulled off a Head and not seen a crack! Sell it quick! O I see you are :-)
phillip.weston,
Nov 22, 5:12am
there's a 70s Sigma with the 2.0 Astron, complete engine/head etc at Pick a part Avondale at the moment.
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