rob83ke70 Posted October 21, 2009 Report Posted October 21, 2009 http://www.cadillacforums.com/forums/cadil...um/t-91248.html Some interesting discussion as to whether to re-use piston rings there. I have an engine that has been "dusted" and has some oil consumption issues. Upon disassembly I have found the cross hatch to be scored and not very nice looking, but the rings and pistons seem ok. Is it possible to hone the cylinders with a bottle-brush type hone, and clean and reuse the rings? I will be probably replacing the cylinder head as well so there is no play in valve guides and there will be new valve stem oil seals so that will take care of oil consumption from that angle. Apparently bearings can not be reused successfully... its all just a thought at this stage, trying to rebuild an engine on a budget (and not have it blow up again either) Robert. Quote
mungi mods Posted October 21, 2009 Report Posted October 21, 2009 http://www.cadillacforums.com/forums/cadil...um/t-91248.html Some interesting discussion as to whether to re-use piston rings there. I have an engine that has been "dusted" and has some oil consumption issues. Upon disassembly I have found the cross hatch to be scored and not very nice looking, but the rings and pistons seem ok. Is it possible to hone the cylinders with a bottle-brush type hone, and clean and reuse the rings? I will be probably replacing the cylinder head as well so there is no play in valve guides and there will be new valve stem oil seals so that will take care of oil consumption from that angle. Apparently bearings can not be reused successfully... its all just a thought at this stage, trying to rebuild an engine on a budget (and not have it blow up again either) Robert. buy new rings..do not reuse oil consumption is ring and valve guide related bearings can be reused as long as they and the crank are not worn get a micrometer and check the crank for size if more than 5 thou small get it ground and new oversize bearings to suit Quote
Boost+k Posted October 21, 2009 Report Posted October 21, 2009 yea i wouldn't recomend reuseing them, but i have done it in a 5k before, only because it was the weekend and i needed the car to get to work on monday Quote
rob83ke70 Posted October 21, 2009 Author Report Posted October 21, 2009 Can I also add that the engine in question is about 100-130k old and nothing appears visibly worn out other than the surface of the bores... The wide wide web of bullshit is not to be trusted however - you read scary things on american forums sometimes. Robert. Quote
philbey Posted October 21, 2009 Report Posted October 21, 2009 If your bores are scored, I would hazard a guess that your rings have bedded in to the scores to some degree, at least creating various "high spots" on the rings. if that's the case, you'd accelerate the wear on your new bores if you reuse them. If you can get away without boring her out, then you'll at least save on the need for new pistons. Although I've seen 40thou pistons in a 60thou bore..... dodgy. Quote
rob83ke70 Posted October 22, 2009 Author Report Posted October 22, 2009 will be replacing both rings and bearings as they both show small signs of wear and I don't ever want to do this job again... Robert. Quote
mungi mods Posted October 22, 2009 Report Posted October 22, 2009 replace oil pump ,water pump and hoses oh and replace all gaskets too Quote
altezzaclub Posted October 22, 2009 Report Posted October 22, 2009 Gosh... where did that thousand dollars go..??? This was going to be a $150 headgasket job as I remember... :) Quote
philbey Posted October 22, 2009 Report Posted October 22, 2009 oil pump... hmm, I never even checked my oil pump lobe clearance. Anyone ever bothered with a K engine? Quote
curly Posted October 22, 2009 Report Posted October 22, 2009 Did someone say 5thou surely you mean .5 thou, if it was using oil before and you hone it and put all the old bits back in its gonna use more than before Quote
rob83ke70 Posted October 22, 2009 Author Report Posted October 22, 2009 old pistons will be ok to re-use, new rings, rod bearings and gaskets obviously. Compression ratio is coming up from 8.8:1 to 9.5:1, ports will be matched to manifolds. camshaft is being reground (tighe 300at) and all clearances/measurements will be checked as I swiped a workshop manual from work for this engine. I have specs for oil pump wear, timing chain stretch, sprocket wear, and heaps of fun stuff now. Water pump is shot, so it will be replaced, and hoses will be at the very least inspected and fittings cleaned to ensure no more leaks. oil pump will be reused if within tolerances, with relief spring shimmed to increase pressure. a larger/better lpg mixer and a larger converter are definitely going on, and a kit will be going through the carburettor. all grime will be cleaned from engine, and I've already spent at least an hour straightening fins on the radiator and cleaning grass seeds and debris from it. I might get carried away and polish the timing cover whilst I'm at it :lolcry: Robert. Quote
rob83ke70 Posted October 22, 2009 Author Report Posted October 22, 2009 wonderful how a simple head gasket job gets more and more expensive the further you look :lolcry: Robert. Quote
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