2 replies to this topic

[3cgreen]

Can anybody help?

When I sent my block for honing I also sent the pistons and ask the machine shop to supply and fit me the piston rings. When I came to fit the pistons the oil ring would not compress Enough into the groove of the piston to allow the to slide into the bore. I'm guessing these are the wrong oil rings? The spring has also marked the inner diameter of the 4mm groove where it has tried to compress. Will this cause any issues?

I'm struggling to find any information on which rings to use? The only thing I have found is that some metro turbo engines use the same pistons?

My pistons are marked 20831 and are from a 1275 metro 12H14C engine. They are the 3 ring type with a 4mm oil groove. The first ring is about 10mm from the crown .
B is stamped on the crown however inside the piston they are marked 20832 A G2 (hepolite)

Just to add, when I tried fitting I oiled the bores of the block and the piston ring compressor. And when that didn't work I turned a tapered sleeve and that didn't work either.

Any information or advice would be appreciated

[Spider]

Can I just throw a warning in here and suggest that you never mix and match brands and types of ring set parts with others. They are designed to work as a pack. Mixing and matching say compression rings from one type with Oil Control rings from another can cause a real smoker or a bore that will last only 10 000 miles. Not in every case, but I learnt the hard way.

 

Firstly, are you absolutely sure you are fitting the rings correctly? In very good lighting, sometimes it's helpful to use a magnifying glass mainly to check the ends are right.

 

Also, have you trial fitted them to the bores and checked the gaps?  The two piece (YUK!!!!) Oil Control Rings you can do easy enough as you would any other Ring. If they are 3 piece types, you only need check the upper and lower rails. Measured Gaps for these are always bigger than that for compression Rings and typically 0.025" or bigger, but you should be able to find some advice from the manufacturer.

 

Next up, what type of Ring Compressor do you have?

 

Lastly, if the top of the Bores on the Block have a too big a chamfer on them, it does make this job very hard and can result in broken rings. I only ever make this chamfer 0.010" and no bigger.

[germini30]

Hi did you find rings after