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Old 22-07-18, 01:07 PM   #1
contaucreek
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Location: Ontario Canada
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Default Lister FR1 piston, rings and COV questions

Hi all. Currently working on an FR single and when I pulled the piston it had a few pretty good scuffed areas but they were all below the top scraper ring. Given the location do you think if the piston measures ok that it is ok to reuse? The chrome sleeve is in great shape. What is the factory piston diameter limits?
The COV was siezed in running position but now seems free and I would like to decarbon it. What is the thread size on the cylinder plug as I need to make a tool to withdraw it?
Surprisingly a new piston is reasonable enough!
Any help greatly appreciated.
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Last edited by contaucreek; 22-07-18 at 01:34 PM.
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Old 26-07-18, 09:44 PM   #2
listermad
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Not pretty I know, but provided that the scoring has not extended into the piston ring grooves and is causing the piston rings to bind in their grooves, after filing off the high spots I don't see why it cannot be used as is.

If you contact forum member lister boy (Mike Maxwell), he had a home made COV plug extractor he made for the FR engine. Also as he has broken up numerous FR4 and 6 engines, and he may even have a good used piston as well.

Quote:
Originally Posted by contaucreek View Post
Surprisingly a new piston is reasonable enough!
If you like taking a risk (Rajkot Roulette) and using Indian sourced items that is quite correct. I know of someone who has a FR3 startomatic and who fitted some STD Indian pistons to the engine, and one of which broke up after less than 200 hours from a full engine rebuild (piston crown broke clean off across the top oil ring groove, and everything on that cylinder was scrap), swore he would never use Indian parts again, remember the old saying buy cheap buy twice
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Old 30-07-18, 01:25 AM   #3
contaucreek
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Many thanks!
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