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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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Old 08-07-2020, 01:28 AM
mgre2643 mgre2643 is offline
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Default Crankshaft Play

Hello

just finished doing a bottom end rebuild on my EC 300 2002 new main bearings seals and conrod installed all went together well and spins freely and selects gears well.

This engine does use the roller type bearing on one side the bearings where with c3 cleareance.

The question is there appears to be quite a lot of play side to side in the crank as in moves about in the cases but no vertical play i haven't attached anything onto the crank yet like the primary nut or flywheel would this and refitting the piston and cylinder solve this problem ?

First time doing this so didn't want to go any further in case i have done something majorly wrong ?

Any help appreciated

Matt


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Old 08-07-2020, 03:42 AM
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Forget your fears. Zip it up and enjoy.
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Old 08-07-2020, 05:32 AM
mgre2643 mgre2643 is offline
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Okay i will try.

Its just that this thing does seem to have a lot of end play and the cases went together like a dream which makes me think the actual diameter of the crankshaft is worn away which is allowing that in and out movement i describe.

Am i on the right track..or is this just a normal thing for an old gas gas ?
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Old 08-07-2020, 11:33 AM
Neil E. Neil E. is offline
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Normally the crank would be a snug fit in the bearing and would not move back and forth. In reality some movement is not a big deal. Other machines that have roller bearings on both sides of the crank always have some end play. This would be .005 to .010 inches. Have you measured the actual play?
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Old 08-07-2020, 11:49 AM
Doc Brown Doc Brown is offline
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If I understood everything right the crank moves from side to side not back and forth.
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Old 08-07-2020, 02:27 PM
mgre2643 mgre2643 is offline
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Yes you are correct the movement is 1mm it moves fully from one side of the case to the other.

It is definitely the crank moving and not the bearing moving in the case the more i think about it the less issues i think this could cause but I'm a novice at this.
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Old 08-07-2020, 02:32 PM
mgre2643 mgre2643 is offline
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Picture of the crank it moves from side to side till.it hits the case
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File Type: jpg 20200807_202810.jpg (118.1 KB, 21 views)
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Old 08-07-2020, 06:29 PM
Neil E. Neil E. is offline
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Movement is not an issue but it should not actually be able to rub on the case while it rotates.
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Old 08-07-2020, 06:35 PM
Neil E. Neil E. is offline
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Is the rod big end narrower than normal? Does the crank pin project out each side of the flywheels? 1mm (.040") movement is large. Is there any change a shim was missed on reassembly? Meaning a shim between the flywheel and inner bearing race. It is normal to shim the crank bearings to reach a nominal reference width.
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Old 08-08-2020, 01:06 AM
Doc Brown Doc Brown is offline
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From what I see from the picture the crank touches the case and that is a no-no. 1mm, as Neil already said seems to be too much imo.

Did you change any parts? Casings or crank? Have the bearings the same width as the old ones?
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