Me and my buddy are rebuilding a couple engines. Did a leak down test on one, both crank seals were leaking(new seals). Put 2 new ones in, its still leaking on the left side around the crank shaft. Im kind of stumped here... Its leaking about 1 pound every 2 minutes. Anyone ever ran into this problem? Should i try another new seal or???
On another motor, the tranny spins fine, shifts through gears fine. When i torque the nut on the main shaft holding the clutch, it locks up. I can torque it to about 25 lbs. before it starts to lock up. Is this a symptom of a bend shaft?
Thanks for any help!
Crank seals, will normally weep some between the crank & seal lips, but not a great deal. Thats how they lube themself or else they would fail with only a few hours or minutes of running time.
Are you lubing the seal lips before it is installed ??.
Is the crank worn on the flywheel side where the seal lips touch & is the crank sleeve worn on the clutch side.
How about those main crank bearings, if they are worn bad that could cause the crank to be off center of the seal keeping the seal lips from sealing.
Hard to say on the trans shaft.
Normally when you torque the shaft nut, on the inner basket, it only pulls the shaft, outter basket bearing race, & transmission bearing tight to each other.
Do you have all the washer shims in the right places on the clutch pack.
May be you have the thick washer in the wrong place in the clutch & when you torque the nut its pulling the clutch gear up aginst the crankcase. Just a guess though.
Realy shouldnt be locking the shaft itself up unless somethings out of place & if it is bent, would have to be bent bad enough to see.
Pull all the clutch parts back off, click the trans into gear & rotate the trans with the output shaft & look at the clutch shaft as it rotates. May need to sit something real close to the shaft to see if its bent.
Thats as much as I know, could be something odd I've never seen before causing these problems though.