The Ford Barn

modela4shane · 07-18-2020, 05:30 PM

I am fitting piston rings on a 255 Merc. and i am using a old set of rings fro Egge. This is just a box of loose rings with no instructions. What ring is for top and 2nd groove? One ring has NO dot and a INSIDE groove and the other has NO dot but a out side groove. Any help would be appreciated. Thank you.

Brian · 07-18-2020, 06:31 PM

Rings with inside groove are top rings, Fit with groove facing up. Idea is that compression gets behind groove and aids in forming a seal
Rings with outside groove are 2nd rings, Fit with groove toward skirt of piston. Acts as a semi scraper

modela4shane · 07-18-2020, 07:27 PM

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Brian from New Zealand... THANK YOU SO MUCH!!

07-18-2020, 05:30 PM	#1
modela4shane Senior Member Join Date: Jul 2011 Posts: 165	Piston ring top and 2nd. Up or down groove I am fitting piston rings on a 255 Merc. and i am using a old set of rings fro Egge. This is just a box of loose rings with no instructions. What ring is for top and 2nd groove? One ring has NO dot and a INSIDE groove and the other has NO dot but a out side groove. Any help would be appreciated. Thank you.

07-18-2020, 06:31 PM	#2
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,829	Re: Piston ring top and 2nd. Up or down groove Rings with inside groove are top rings, Fit with groove facing up. Idea is that compression gets behind groove and aids in forming a seal Rings with outside groove are 2nd rings, Fit with groove toward skirt of piston. Acts as a semi scraper __________________ Unfortunately, two half wits don't make a whole wit!

07-18-2020, 07:27 PM	#3
modela4shane Senior Member Join Date: Jul 2011 Posts: 165	Re: Piston ring top and 2nd. Up or down groove Sponsored Links (Register now to hide all advertisements) Brian from New Zealand... THANK YOU SO MUCH!!