Head Gasket problems

[Fernando cunha]

i have 1984 Mitsubishi Cordia turbo.
had since i was 17 years old.
i just found out how hard is to find the right parts for this car.

i have Mitsubishi 1795cc 4 cylinder 4G62 Sirius SOHC 8V Turbo
head gasket is the right gasket as you can see in picture
Mitsubishi part numbers.
MD040532
MD189978
unfortunately they don’t have them anymore so im realing on after market.
now if you look close to head gasket the fire rings are not perfectly round.
i have done a lot of ringing around auto parts stores and emailing ebay sellers etc.
everyone believes you can put head gasket of 4g63 on 4g62 .
you can but you have a gap of 3mm between cylinder wall and gasket ,
i believe gasket won’t last long,gasket needs to be flush with cylinder.

my question is can you put a head gasket piston size 85mm (2L engine)on
a 1.8L engine piston size 82mm?
will it last?
thank you

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• DSCF1664.jpg

Topic

[Mike]

At first I thought that your engine might have been overbored. According to what I’ve read, the 4G62 engine has a bore of 80mm, not 82mm. However, 2mm converts to almost 79 thousandths of an inch, which is way too much for an overbore.

I’ve read that Mitsubishi also sold some units from the 4G62 engine family to Hyundai. There was a version with an 81.6mm bore, (very close to your 82mm), known as the G4CN. Perhaps a previous owner dropped one of these engines into the car you have. If you have the larger bore G4CN, you might be able to find the correct gasket for it.

[Fernando cunha]

my question is can i use the 4g63 gasket knowing there is a gap between cylinder and fire rings?
i will check G4CN but hyundai never came out with turbo.
only 4g63t came out with turbo also called vr4 engine
that i know of and seen on sonatas etc.

[Fernando cunha]

The standard gasket is 82mm to allow for overbore……..yes the standard piston is 80.6mm, better than 3mm on an 85mm gasket.

You can see in my pic that the edge of the bore is slightly seen.

[Author]

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