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valve timing #665194 08/25/16 11:16 am
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mcaleer Offline OP
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took the cam pinion gears off without marking ('79 Triumph T140 E).Now with a degree wheel and valve lash @ zero clearence I have set intake opening @40 degrees btdc and exhaust @ 74 degrees abdc. Runs well on 1 cylinder not so much the other. Question: do I set the intake on one cylinder and the exhaust the other ? or does it matter. Any help greatly appreciated. MAC

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Re: valve timing [Re: mcaleer] #665202 08/25/16 1:34 pm
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triton thrasher Online Content
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What set of instructions tells you to time it for opening and closing with zero clearance? Sounds strange.

You can time inlet and exhaust on the same cylinder.


Amateur Loctite enthusiast.
Re: valve timing [Re: mcaleer] #665248 08/25/16 7:59 pm
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ken sak Offline
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you may have bad ignition timing on your second set of points
do you know you have to juggle between the 2 sets to get a compromise

Re: valve timing [Re: mcaleer] #665317 08/26/16 2:31 pm
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mcaleer Offline OP
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Running a Boyer ig and both sides time well. Setting valve timing with a fully assembled motor. So I should set the valve lash at .02"on in and ex rockers? I assume these are stock cams and if so is the correct opening for intake 26.5 degrees btdc and the ex 61.5 degrees bbdc ? Is the T140E considered a short rod motor? Compression shows 115# on both sides. Thanks for those responses. MAC

Re: valve timing [Re: mcaleer] #665325 08/26/16 3:46 pm
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JubeePrince Offline
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Originally Posted by mcaleer

Is the T140E considered a short rod motor?

Yes.

Originally Posted by mcaleer
Compression shows 115# on both sides.


Sounds a bit low, but it should run. Did you have throttle wide open?

"Runs well on 1 cylinder not so much the other"
What does that mean exactly? Missing? Backfiring? eight-stroking?

Workshop manual: http://www.classicbike.biz/Triumph/Repair/1970s/73-78-Triumph-Bonneville-Tiger-Workshop-Manual.pdf


Steve

Attached Files timing.jpg
Last edited by JubeePrince; 08/26/16 3:50 pm. Reason: link

'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: valve timing [Re: mcaleer] #665456 08/27/16 7:40 pm
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mcaleer Offline OP
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wouldn't run on L cylinder ( dies when spark plug wire removed) Compression checked with throttle open. What would help and what I can't find is when are the intake and exhaust valves supposed to open using a degree wheel for this model ( ' 79 T140 E )This bike is a TRITON that I have worked on for the last 18 months. Thanks to all that read this MAC

Re: valve timing [Re: mcaleer] #665462 08/27/16 9:09 pm
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desco Online Happy
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If it's running on one cylinder and not the other doesn't that preclude valve timing? If one side works wouldn't the other side be real close? Maybe you're barking up the wrong tree. Have you tried Googling the subject?


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: valve timing [Re: desco] #665481 08/28/16 5:01 am
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triton thrasher Online Content
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Originally Posted by desco
If it's running on one cylinder and not the other doesn't that preclude valve timing? If one side works wouldn't the other side be real close? Maybe you're barking up the wrong tree. Have you tried Googling the subject?


Googling does work.

http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=441724


Amateur Loctite enthusiast.
Re: valve timing [Re: triton thrasher] #665531 08/28/16 4:10 pm
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mcaleer Offline OP
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One more question. Since my skill level requires me to use a degree wheel and not a dial indicator ( motor is assembled) and I'm really only interested in the valve opening figures I'm having trouble finding those numbers. The t120 is intake opens @ 34 degrees btdc and the ex opens at 55 degrees . Found something on the internet for the short rod t140 that says in opens at 26.5 but no numbers for the ex. . Mr haynes says In opens @ 3.83mm and Ex closes @ 2.23mm all at tdc . What do those numbers mean? How are they measured, are they related to a degree wheel? Moto Envy show is in 10 days. MAC

Re: valve timing [Re: mcaleer] #665551 08/28/16 6:45 pm
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Are the numbers listed taken with the valves at max open or the very beginning of opening ? MAC

Re: valve timing [Re: mcaleer] #665554 08/28/16 7:50 pm
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desco Online Happy
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Volumes have been written about cam timing. Too much to repeat here.
Try this as a place to start. Copy and paste this to Google;
triumph t140 cam lobe center timing

I don't think you can do it accurately without a degree wheel on the crank and a dial indicator. And some disassembly. I picked up a dial indicator and base from Travers Tool for about $30.
Knowing what cams you have would be a big help. You are pretty much peeing in the wind without a starting point.
Good luck.
A back issue of Vintage Bike Magazine Vol. 2005-2 Autumn 2007 has a very clear explanation complete with pictures. It's the only way I got my 68 running. Thank you Mr. Healy.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: valve timing [Re: mcaleer] #666098 09/01/16 11:37 am
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mcaleer Offline OP
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Discovery ! turning the motor over by hand I noticed that both ex valves were opening and closing at the same time . Not all the time but every so often.Then I noticed that the ex cam had a lot of play side to side , pulling it would cause both valves to move together. The cam pinion gear was not seated as far on the cam as it should have been. Removing it and cleaning up the key way then replacing it making sure it fit properly cured the problem . I was timing the valves correctly after all. Thanks for everyone that gave suggestions, MAC


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