...basically just to make a start on the re-build really.
Dropped the water and disconnected everything that needs to be and pulled the head off and I now don`t know whether what I found is bad or good (considering).
There are slight grooves at the top of the bores (all of them) but #2 seems to be ever so slightly worse than the rest. The groove at the top of #2 is AT MOST 0.25 - 0.5mm (1/4 - 1/2mm)all the rest seem less than this.
Now bearing in mind that I know nothing at all about this cars history (except the last 2-3 years) and the car has over 137200 miles on it, is this a good or a bad find and more to the point will I get away with just new rings (provided I remove the the lip) and run it in slowly. Ideally I want to get away with just the rings ( I have all I need already including me new(er) head) or do I need a new block or a re-bore (Prices please).
Also bear in mind that I DO NOT want silly amounts of power from this thing just a nice reliable quick-for-what-it-is motor and by no means will I be trying to squeeze any more power than I should be getting out of it basically it will just still be a `91 8v Cav SRi STANDARD!!
Internal micrometer about halfway down the bore, first measure front to back, then side to side?
Got a loose piston? Put it down the bore then use a feeler guage to measure the gap at on point. Then turn it through 90 degrees and measure again? (make sure you turn the piston and put the feeler guage down the same point on the piston as it may be oval itself)
Haynes usually has all sorts of specifications about this stuff.
Animal, I don`t have any facilities for doing that big a job, I`m just about managing to get the head off and the pistons out on the driveway in the p1$$ing down rain and the cold without having to remove more stuff than is absolutely needed.
Also, is there any special reason why this is such a good idea or could I just wrap a good clean rag around the whole thing and do it??
a rehone you can do with a rehoning tool and a powerdrill...
have you still got the engine in the car?
If so, you can take the crank out from underneath. It's a pain in the arse, much easier on an engine stand, but still very doable.
you gotta remove the sump, oil pick up pipe, then pistons and rods, then clutch and flywheel, and then oil pump , amd finally the crank. It's a pain in the arse, but kinda worth doing. if you're gonna do the piston rings, you're going to have to take the sump off, and the pistons out anyway, so for a little extra time, it's worth it to be thorough.
once it's out, you can check the state of the main bearings and big ends. if they're scored, then you'll probably need to replace em. the mains generally last well, as there's no real load on em, it's the big ends which get mullered.
i was at partco the other day and noticed an odd tool that drew my attention, it was a psykes pickavant rehoning tool, very reasonably priced, but if it had shocked me i would have remembered how much it was