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Crankshaft end play?
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@mickeyfan1 avatar
Mickeyfan1
UTC
Enthusiast
1965 VBB/2005 Stella
Joined: UTC
Posts: 80
Location: Leetonia, ohio
 
Mickeyfan1
Enthusiast
@mickeyfan1 avatar
1965 VBB/2005 Stella
Joined: UTC
Posts: 80
Location: Leetonia, ohio
UTC quote
Watching a videos on YouTube, after a rebuild they mentioned to check for a very slight end play on the crank from end to end.
I rebuilt my '65 VBB 150 using all new bearings and seals. The bearings are pressed on the crank. Then the cases were heated and the crank with bearings were seated into to the cases.
I have not such "very slight end play".
My question is where would ANY play come from? The bearings are tight on the crank and the bearings are tight in the cases. I would expect absolutely no play if that were true.
If any play were there wouldn't it have to cone from within the bearings themselves? Just wondering.
@ginch avatar
Ginch
UTC
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
Joined: UTC
Posts: 8955
Location: Victoria, Australia
 
Ginch
Veni, Vidi, Posti
@ginch avatar
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
Joined: UTC
Posts: 8955
Location: Victoria, Australia
UTC quote
When you put it together it certainly seems like it can't possibly move. But somehow they seem to anyway... especially when you pull in the clutch.
@pdxjim avatar
pdxjim
UTC
Molto Verboso
2005 PX150 In a Part-time Relationship with a 2-Stroke Vespa Since 2007
Joined: UTC
Posts: 1874
 
pdxjim
Molto Verboso
@pdxjim avatar
2005 PX150 In a Part-time Relationship with a 2-Stroke Vespa Since 2007
Joined: UTC
Posts: 1874
UTC quote
I think the play develops in the main bearing between the races and the ball rollers as is a result of clutching. On a freshly built engine there will seem to be none at all but over time it gradually appears.
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Forum -> Not-So-Modern

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