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#393569 - 09/08/11 3:08 pm Pre unit Camshaft/Crankshaft Pinion Timing Marks ?  
Joined: Sep 2009
Posts: 198
db133 Offline
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db133  Offline
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Joined: Sep 2009
Posts: 198
East Sussex UK
Hi

I'm stripping down a T100 (72679)and found this:



Are these pinions in the correct position for re-assembly or have they been moved previously ?

I have a spare set of pinions :


Why are the marks different ? Is it because the top pictures are a T100 ?

Sorry if its a daft question but we all have to learn.

Pullers wanted.

Last edited by db133; 09/08/11 3:20 pm.
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#393575 - 09/08/11 3:40 pm Re: Pre unit Camshaft/Crankshaft Pinion Timing Marks ? [Re: db133]  
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Deadstiffcatt Offline
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Deadstiffcatt  Offline
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Nor. California
RE the top pics- they are not in correct alignment. The idler gear needs to be lifted up and re-placed so that the marking with identical length dashes is lined up with the crankshaft gear dot. This will place the long dash/short dash at the inlet gear, and the dot to match the dot on the exhaust gear.

On 5T models, the inlet gear would align with the short dash, and on the TR5, it would align with the long dash.

There is a difference to permit the opening of the cam a bit earlier on the sportier model, should run with either dash aligned, but should run better with the right one aligned, and would run best if you can properly time the camshaft opening to it's best position following the valve timing instructions in some of the old pre unit manuals.

Sorry, can't answer the why part on the differences-too many years, models, and gears..........

Pullers- a nice set for pulling can be found at almost any good Brit bike dealer- also check E-bay, especially if you are going to do more Triumphs in the future.

P.S. I hope that's not the wife's coffee table that engine is on. Could prove to be fatal!!! laughing

#393579 - 09/08/11 4:15 pm Re: Pre unit Camshaft/Crankshaft Pinion Timing Marks ? [Re: db133]  
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Posts: 2,766
Gordo in Comox Offline
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Gordo in Comox  Offline
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Comox BC Canada
As I recall the idler gear is smaller than the cam gears and thus is only lined up correctly with all the 'timing' marks once every so many revolutions of the engine. If you were to keep turning the engine over and over until the double lines are on the mark on the crank gear the rest should all line up correctly.

Gordo


Without frequent roadside repairs there is no fun in riding!
#393585 - 09/08/11 4:46 pm Re: Pre unit Camshaft/Crankshaft Pinion Timing Marks ? [Re: Gordo in Comox]  
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db133 Offline
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db133  Offline
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East Sussex UK
Top info much appreciated. db

Last edited by db133; 09/08/11 4:48 pm.
#393600 - 09/08/11 5:48 pm Re: Pre unit Camshaft/Crankshaft Pinion Timing Marks ? [Re: Gordo in Comox]  
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Deadstiffcatt Offline
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Deadstiffcatt  Offline
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Joined: Apr 2011
Posts: 915
Nor. California
Gordo, agreed! Seems it's once every 97 or so that all marks line up to the original due to the idler gear size. You explained it well where I couldn't find the right words.

#393664 - 09/09/11 12:06 am Re: Pre unit Camshaft/Crankshaft Pinion Timing Marks ? [Re: db133]  
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Gordo in Comox Offline
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Gordo in Comox  Offline
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Comox BC Canada
Yes, the 'hunting tooth principle' will explain it nicely.

http://www.dliengineering.com/vibman/huntingtoothgearsets.htm

Gordo


Without frequent roadside repairs there is no fun in riding!

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