I am new to the forum. I've lurked around during most of my project waiting to get the go ahead from the registrar. Finally, I'm in!
With the shims I have, I can get my crank end play down to .008". Is that good enough?
My other choice is to bring it down to 0.8mm - a bit tighter than the .10mm stated in the manual.
I assume that a tad loose is better than a tad tight - right?
I've gotten my other shafts to play nice!
As an enforced lurker for over two months, I have to say that this forum is truly a jewel!
You folks are terrific.
Gunbay, Welcome to the POG.
Remember, you are dealing with angular contact bearings - too much endplay causes excessive radial play. "A tad loose" is no good for a rebuilt motor IMO. Too much trouble to rebuild one and not get it right.
I think you might have missed a "0" in reporting 0.8mm end play. Don't you mean 0.08mm endplay. (0.08mm*0.039in/mm=0.003in). I think you should be OK, but don't build your engine on my word. Doug? Kip?
Ernie P.
Chattanooga, TN
You're right, 0.08mm is what I get.
Sorry, I have a standard depth gauge and a metric standard!
John T. Gurley
Falmouth Maine
(Sachs) Book indicates .004 per shaft and I will go .005/.oo6 Max in some cases. Sometimes you have to open and close the cases several times to get the 4 shafts close. It can happen the first time or in some cases (no pun) as many as 6 times on certain engines:(. I get them as close as possible but won't fret over 1 or 2 thousands. They will loosen over time anyway. Key is, don't get them too tight as this will burn up bearings and shafts (blue coloring). Have fun!
PS: Don't forget 700 cc of engine oil VS 600cc. Keeps the Layshaft right end oiled
On the Sachs and KTM motors I try to get the crankshaft end float as close to zero as possible, .001-.002" OK, make sure it feels free with no binding. Trial assemble without the seals for a better feel. I have a KTM manual that incorrectly lists the float at something like.008"!
Coming from an OSSA background, I separately assembled the cases with one shaft at a time for the purpose of checking end play with a dial indicator. That whole business of measuring the depth of the casing was too fastidious for my shaky middle-aged hands!
Thanks for the help.
John T. Gurley
Falmouth Maine