The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: agonda1 on 18.11. 2015 19:11

Title: 1st and 2nd piston ring positioning
Post by: agonda1 on 18.11. 2015 19:11

Have noticed that 1st and 2nd piston rings have a reduced 'notched' corner maybe only a few thou.Does this corner face up or down ?

Thank's

Jim

Title: Re: 1st and 2nd piston ring positioning
Post by: RichardL on 18.11. 2015 21:14

I think you will find that there is some etched-in text on one side of the ring and that should face up, as I understand it. Feel free to wait for a second opinion.

Richard L.

Title: Re: 1st and 2nd piston ring positioning
Post by: Triton Thrasher on 18.11. 2015 21:17

Rings usually come with instructions.

If you post a picture, we might have some idea.

Title: Re: 1st and 2nd piston ring positioning
Post by: Triton Thrasher on 18.11. 2015 21:26

Anything useful here?

http://www.a7a10.net/forum/index.php?topic=10018.15 (http://www.a7a10.net/forum/index.php?topic=10018.15)

Title: Re: 1st and 2nd piston ring positioning
Post by: The Artful Bodger on 19.11. 2015 00:54

In days of old some rings when supplied not with pistons, had a step on the outer corner, these were for the rings to clear any "step" worn in the bore. So the top ring would have the step to the top and the lower ring to the bottom. Very possible when fitting new rings to a slightly worn bore for the ring to break when it hits the step.
 
Colin

Title: Re: 1st and 2nd piston ring positioning
Post by: agonda1 on 19.11. 2015 13:26

Thank's  -  will go along with this explanation

Jim

Title: Re: 1st and 2nd piston ring positioning
Post by: bsa-bill on 19.11. 2015 16:13

Good post Dodger -  logical when you think about it