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Knock

L

L.B,

Member
1941 A. Starter would not always catch the flywheel. I moved the flywheel in closer to starter. It worked fine at this point but after it started and at low RPMS it has a knock, get the RPM up knock would disappear, bring RPMS down knock knock.
 
Got to have the right crankshaft endplay. Moving it in to help engage the starter was not the thing to do.
 
I would suggest finding out whats worn/ why it's not working right and fix it properly.
I would say the starter engagement/ pinion or flywheel ring gear is worn and it didn't mesh far enough in. It could be a combination of all the above.
It might cost time and money, But you'll be a lot happier than wrecking something and destroying more parts/ costing even more money, that could of been avoided reasonably cheaply.
Regards Robert
 
When you moved the flywheel it gave the crank to much end play causing a knock. The flywheel is on the crank in a certain position for a reason. The only real fix is a new ring gear.
 
If you had enough end play that the starter would not reach you could have a thrust out.
 
Well, moving the flywheel toward the starter would DECREASE end play, so I'd guess that is not the source of your problem.

The knock, I'd guess, is from the flywheel not being tight. If it goes away under load, or when you engage the clutch, it's most likely the flywheel being loose. Make sure the bolts are torqued appropriately- too tight will just stretch them.

If you removed the flywheel make sure you got it back on the correct spline.

Then check out your starter and ring gear. You may need a new starter drive. It is possible to turn the ring gear around and use the other side if you take the time to use a small grinder and bevel all the teeth.
 
Correct crank end play is .005-.010", which is adjusted by sliding the flywheel on the crank. You will have to push the crank to the left to slide the flywheel far enough in to get the right end play. I remove the clutch cover and use a hydraulic jack to do this. If your flywheel was out far enough to miss the starter drive it had to be about 1/2" too far out---way, way tooo much! The crankshaft spacer slot without doubt would be out of line with the flywheel drive key, so that would prevent the flywheel from sliding to its correct position. If you are getting a knock after moving the flywheel you may not have it tight on the splines, or if run that way very long the splines on the crank or flywheel may be worn beyond use. There are people who rebuild cranks, but it's not cheap. Good luck with it.
 
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