is there a "TOP" or up on the #3 Oiler Ring?

[BMANN06]

Hey Guys,

I've got two 215s on my bench to rebuild, just got em back from machine shop. I'm reusing pistons and have 6 new sets of Std bore rings to go in. Each ring (#1 and #2) is marked "E TOP" except the #3 oiler ring. Does it matter which way you install the #3 ring. The manual is sketchy at best.

 

[BMANN06]

I found a piston in a box that still had the rings on it, the oil scraper ring has an "O" on one side and it was on TOP (Just for anybody else out there that may have this question some day).

 

[griz400]

shows your correct on that and make sure u space em -- to prevent blow by, Use a ring expander to prevent breakage
during installation. The oil ring must be installed
by hand.
Check that rings rotate smoothly after installation.
Space the piston ring end gaps 120° apart and do
not align the gaps with the piston pin bore or the
thrust side axis.

also make sure you end gap is within limit -- should be a sheet with the rings
Install the oil scraper ring first, then the taper-face
ring with the word “TO” facing up, then the rectangular
ring with the word “T” facing up.

View attachment 16217

 

[BMANN06]

Thanks Griz!! Appreciate it! That's not the first time I've seen BRP delete important information, I was using an 06' Ski manual. I understand the 120 degree spacing. But I'm a little unclear of "do not align gaps with the piston pin bore or thrust side axis" The pictures and explanation is a bit unclear and I really don't want to re-do this. This is the first time I've actually installed the rings and installed the pistons, for my previous rebuilds I had the machine shop check the ring end gap, and install the pistons into the sleeves. I have a good quality ring removal tool, and bought a nice snap on piston ring compresssor and figured I give it a try.

 

[griz400]

here is how hastings explains it -- MAJOR THRUST FACE

That portion of the piston skirt which carries the greatest thrust load. This is on the right side when viewing the engine from the flywheel end with the crankshaft rotating counterclockwise.

and here is the link --- http://www.hastingsmfg.com/ServiceTips/piston.htm


note **** it would be the side with the most wear when you took it apart --- the thrust wears usually from piston slap

the portion of the piston skirt which carries the greatest thrust load

 

[BMANN06]

Thanks man after some reading ... basically after you gap the rings and get them on the piston just make sure the gaps on the rings aren't parrallel (or line) with the piston ring pin, or in line with the intake port or exhaust port. Got the bottom case all together tonight which is sweet! I'll be picking up the head this week, it needed some machining. Should have this all together by next weekend!

Thanks again!