SOHC.co.uk Forums > Project Board
1976 CB550F1 (what have I let myself in for) Project
Nurse Julie:
--- Quote from: eight0 on February 28, 2021, 02:48:15 PM ---The writing is facing upwards. That's correct right?
--- End quote ---
Yes, correct.
Bryanj:
Its possible but very rare that the ring groove is not machined deep enough, try clamping them with a jubilee clip carefully
Laverda Dave:
Is the oil scrapper ring in three pieces? Sometimes the very thin top and bottom rings don't sit fully in the ring groove due to the centre ring taking up most of the space. This happened to be with the RSA piston, it was very tight in the bore but fine when the rings were not fitted. It turned out to be the lower scrapper ring sitting slightly proud as it was sitting against the centre scrapper section at the back. I think I read it on the forum the best way to fit a three part oil ring is to fit the upper and lower rings first followed by the centre scrapper part. Maybe worth a try.
Nurse Julie:
There is a Forum member called Ashdowner, Andy, who had exactly the same problem with a set of 550/4 K3 pistons / rings (or maybe just rings, I can't quite remember now) that he bought from Silver. It almost drove him mad as he couldn't get the 'sandwich' together on the oil rings at all. He even sent them back to Silvers and they said they were fine. In the end, he fitted a set from another supplier or fitted the old ones and they fitted just fine.
eight0:
Ok breakthrough moment.
I tested each ring individually. Top two are fine but the oil rings are the issue. I tried with just one of the thin rings either side of the oil scraper and no difference.
I tried the two old pistons thin oil scraper rings and.. no binding.
Now I guess I could carefully file down the new rings, but can I or should I use the old thin rings, bearing in mind they are not oversized.
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