GXV120 vertical engine rebuild questions

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  #1  
Old 03-09-17, 06:42 AM
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GXV120 vertical engine rebuild questions

I am installing new rings (engine is smoking badly) and ran across some possible issues. There is a lot of end play in the crankshaft (I will measure later but seems excessive) and the timing gear has a groove in it where it rides on the case (which adds to the end play). I looked at diagrams on line and don't see one but it seems there should be a washer between the timing gear and the case. I will try to get a picture of it to post but drew it for now.

Is the timing gear supposed to be flat where it rides on the case?

How much end play should it have?

Could I correct the end play by adding a washer if necessary?
 
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Old 03-09-17, 07:15 AM
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Took some pics and did some measuring. End play is about .035 and it is hard to see in the picture but the groove in the timing gear is about .008. The surface on the case seems nice and smooth; I would have expected to see some signs of abnormal wear. I also do not see the TDC mark on the timing gear, is it possibly worn off or do some not have a mark?
 
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Old 03-09-17, 11:19 AM
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I'd use hardened thrust washers to shim up the slack, maybe get the end play down to .005" to .010". The timing dot is gone but it can still be timed without it.
 
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