By joining you will help ensure that we can continue to provide this service
JOIN HERE!
Valve guide clearance R12?
Valve guide clearance R12?
The specialist redid it and I checked the clearance between the valve stem and valve guide to make sure it was OK. It was 0.07mm (diameter) so that looked good to me.
Apparently that wasn't enough because within 2km after assembly again the exhaust valve got stuck.
Does any of the veterans have a recommended clearance for these old sidevalves? I think I'll go for more than 0.07mm but what is reasonable before it gets too much?
Thanks for any advice,
Peter
Re: Valve guide clearance R12?
clearance of 0.1 up 0.8 its ok.
Re: Valve guide clearance R12?
Re: Valve guide clearance R12?
So even with the proper inner diameter of the valve guide at all spots and it moving freely at room temperature, the exhaust valve stem could have gotten too close to the valve guide sidewall once the cylinder reached normal working temperature. Causing it to rub against the sidewall causing more friction heat than normal.
Just my theory. We'll see after reaming to a straighter hole with a piloted reamer.
Ed.: reamed inlet to 0.07mm and exhaust to 0.1mm. Seems to be OK now.
-
- Posts: 135
- Joined: Mon Apr 07, 2014 2:45 am
Re: Valve guide clearance R12?
during WW2.