Running on the rich side??? or?
Definitely Vincent, but mostly before I bought it.Running on the rich side??? or?
Thanks David, that sounds like like really good advice.Testing at TDC is the best because that is where the explosion takes place. However, as a general check, you can simply remove the two pushrods and then do the check on that cylinder. When the air is turned on the piston will automatically move to BDC, but the reading should tell you what you want to know, which is how much air is passing by the rings or the exhaust and intake valves. It is often difficult to hold the engine at TDC with 100 lb pressure in the cylinder.
When you are done, you can just install the pushrods and check the clearance at TDC as usual.
David
Select Top Gear -Apply the BrakeTesting at TDC is the best because that is where the explosion takes place. However, as a general check, you can simply remove the two pushrods and then do the check on that cylinder. When the air is turned on the piston will automatically move to BDC, but the reading should tell you what you want to know, which is how much air is passing by the rings or the exhaust and intake valves. It is often difficult to hold the engine at TDC with 100 lb pressure in the cylinder.
When you are done, you can just install the pushrods and check the clearance at TDC as usual.
David
Many thanks for your suggestion, which worked! A common sense solutionSelect Top Gear -Apply the Brake
I did as you suggested, it worked, thank you.Select Top Gear -Apply the Brake
Carbon is not magnetic. If there are some iron filings mixed up in the carbon then it might seem to be magnetic.
Leak down test completed, 12% loss from front cylinder and 14% loss from the other, so it’s looking good there I think.Broken rings usually stay in place. Over time the bits of ring widen the ring groove, but they still remain trapped in the piston.
View attachment 60851
I suppose it could be a small shard that made it by the piston. The best thing to do is a leak-down test, but you probably don't own a tester. A compression test should tell. When I did a leak-down test on the above cylinder it showed 60% of the air passing by the rings.
Fortunately, I had a Nicasil aluminum cylinder liner in the muff and it is still running today 13 years later.
David
Where did you loose it from ? Intake, exhaust, rings ? Over how long did you do your leak down test ? Might need to lap your valves and/or re ring.I’m
Leak down test completed, 12% loss from front cylinder and 14% loss from the other, so it’s looking good there I think.
Air loss was past the rings, no loss detected past the valves. Test duration was about 5 minsWhere did you loose it from ? Intake, exhaust, rings ? Over how long did you do your leak down test ? Might need to lap your valves and/or re ring.