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Triumph 650 crankshaft end play #302108
03/09/10 1:29 am
03/09/10 1:29 am
Joined: Mar 2006
Posts: 10
Hampden, MA.
N
No Dough Offline OP
BritBike Forum member
No Dough  Offline OP
BritBike Forum member
N
Joined: Mar 2006
Posts: 10
Hampden, MA.
Question for the collective.
Upon rebuilding my lower end with new main ball bearing (timing side) I have about .024 of crankshaft end play (float). Workshop manual allows up to .017, should this be addressed? How?

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Re: Triumph 650 crankshaft end play [Re: No Dough] #302111
03/09/10 1:41 am
03/09/10 1:41 am
Joined: Oct 2003
Posts: 11,200
North Georgia, USA
RF Whatley Offline
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RF Whatley  Offline
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Joined: Oct 2003
Posts: 11,200
North Georgia, USA
If you have not installed the pinion washer, pinion gear, and torqued the c/s hex nut, then we do not consider your c/s fully installed.

If you have done the above, then all axial play is controlled by the condition of the TS main bearing. Too much axial play = bad TS main bearing.

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
Re: Triumph 650 crankshaft end play [Re: RF Whatley] #302114
03/09/10 1:49 am
03/09/10 1:49 am
Joined: Mar 2006
Posts: 10
Hampden, MA.
N
No Dough Offline OP
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No Dough  Offline OP
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N
Joined: Mar 2006
Posts: 10
Hampden, MA.
Thank you, will do.

Re: Triumph 650 crankshaft end play [Re: No Dough] #302165
03/09/10 12:43 pm
03/09/10 12:43 pm
Joined: Jul 2009
Posts: 3,549
Vic. Australia
P
Pete R - R.I.P. Offline
In Remembrance
Pete R - R.I.P.  Offline
In Remembrance
P
Joined: Jul 2009
Posts: 3,549
Vic. Australia
If you believe that,you'll also believe that you don't need any bearing shoulders in the cases to stop the bearings walking out either side of the engine when it is hot and loaded.
Fact is you do need these bearing shoulders.If you can't see daylight between the top of the outer race and the case,when the engine is hot and under load,its bloody close to that.
Put your shims on the mainshafts,between the bearing and the crank web, where they are most likely to centralize the conrods in the cylinders.Leave at least 0.003" float(end clearance for the rollers on the drive-side bearing);yes ,I know 0.003"-0.017".
THEN tighten up the crank to the timing-side bearing.Would every body be happy with that?I reckon I'd be happy with it,especially if the rods were pretty central,and the drive-side rollers had 0.003" clearance,minimum, and not too much more.

Last edited by Pete R; 03/09/10 12:58 pm. Reason: "on the- - - - web"

Moderated by  John Healy 


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