Blown Head Gasket=Rusted Rings

[Chris72]

I purchased a a 202 yesterday that was apparently a good runner, when I got it home I could not get it to turn over, after removing the manifolds I noticed rust in the inlet and exhaust head chambers above number 1 and number 3 piston, straight away I thought this motor had been cooked and seized , so I removed the head and it was obvious that it had got pretty hot, I poured some transmission fluid into each bore and left to soak overnight.
Today I did manage to get the piston's free and apart from number 1 cylinder all the bores look fine with hardly any wear to the cylinder walls, no ridges in the tops of the cylinder either but the rings in number 1 cylinder had rusted to the bore, not sure if the rust has extended into the cylinder walls and not wanting to take a die grinder to it, so I thought I'd try an experiment using a molasses water mixing to eat away at the rust, this hopefully should allow me to see the extent of the damage with out me causing any damage, if I'm lucky I can just hone the bores and put new rings in otherwise it will need boring out and new pistons which is something I really don't want to do with this motor. pic below of before molasses water mix, will update with pic's in a week or 2.

Cheers Chris

http://i59.photobucket.com/albums/g303/RCK-914/DSCF3372.jpg

[Landy Smurf]

that sucks if you need a spare push rod i have one they sent for a red 186 motor

[Chris72]

Thanks for the offer Landy but I have a few spare push rods from another 202.

Cheers Chris

[Homestar]

If you can get all the pistons out in one piece, a good hone and a set of rings should see it happy for a while. These are a great engine, and really take a lot of abuse.

I have stuck a set of oversize rings on standard pistons before, when the bores were worn out, and there was a huge lip on the bores. Cut the lip off, honed the crap out of it, whacked a set of 10 thou over rings in it after checking the ring gap, and crossed my fingers. Apart from sounding like a diesel when first started, it ran fine, didn't blow any smoke, and was used as a daily driver in a HX Kingswood for several years.

Tough old engines, you'll get it going again. :)

[Chris72]

They do take a bit of abuse alright, my first car had a 173 in it and that motor out lived 4 gearbox and 3 diff's before It spun a big end bearing :D . I'm keeping my fingers crossed that the no.1 bore isn't to bad as the rest of the motor looks pretty good, I have another head off a 202 and std pistons which were retired because it used lots of oil so that one should be straight with no warping, with new valve seals and a valve grind I think it should be ok, also ring sets are cheap for these motors, if all fails at least I have something to swear at when I'm in the shed lol.

Cheers Chris

[Chris72]

I can't believe how well this worked out, after cleaning out the molasses from the bore I was left ridge of carbon around the bore scraped it back with a razor blade and a quick clean up with a brass brush, now the piston moves freely up and down, looks like this block has been saved with very little effort.

Cheers Chris

http://i59.photobucket.com/albums/g303/RCK-914/DSCF3387_zpsad573364.jpg
http://i59.photobucket.com/albums/g303/RCK-914/DSCF3388_zps61f17a6f.jpg