GXV120 vertical engine rebuild questions


  #1  
Old 03-09-17, 07:42 AM
S
Member
Thread Starter
Join Date: Mar 2017
Location: United States
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
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?
 
Attached Images  
  #2  
Old 03-09-17, 08:15 AM
S
Member
Thread Starter
Join Date: Mar 2017
Location: United States
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
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?
 
Attached Images   
  #3  
Old 03-09-17, 12:19 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 15,950
Received 138 Upvotes on 127 Posts
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.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description: