Subject: Re: Followup: Valve timing expertise needed
Author: bluezi-@att.net
Date: Jul 25, 2004, 4:40 AM
Post ID: 1717221518
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Greg,
I assume that your timing method will work for other bikes as well? My Eldorado runs like a clock, but my 1967 Triumph Tiger is way out, and I recently obtained a degree wheel but was kinda clueless as to exactly what I should do with it....
By the way, your web site is the greatest!
Bill
73 Bronze Eldo
-------------- Original message from Greg Bender : --------------
| Your free subscription is supported by today's sponsor: ------------------------------------------------------------------- Amazing Diet Patch The fastest - Easiest way to lose weight! Try it now FREE! http://click.topica.com/caacoW6b1dfltb7N01Na/MyDietPatches ------------------------------------------------------------------- Just a follow up to my valve timing experience... Taking Brett's advice, I downloaded and printed a copy of a degree wheel. It was easy enough to mount on the crankshaft (using the three pulley bolts to secure it in place). Sure enough, when I checked my valve timing, it was way off. The exhaust valve on the number 2 cylinder is supposed to start opening at 122 degrees after top dead center. Mine was starting to open at 158 degrees after top dead center. So, following the instructions in the workshop manual, I set the valve timing correctly. Afterward, it was very satisfying to verify the opening and closing positions of the intake and exhaust valves with the degree wheel and the values given in the book. The engine started right up and ran well after a quick adjustment of the ignition timing. Ah...that really felt good!!! :> ***The only part of this experience that remains unsatisfied is not knowing why my timing was so far off when I used the timing marks from the other two sets of timing gears. All this and I didn't even have to remove the engine from the frame to get at the flywheel! Two things made this technique possible: (1) I used the degree wheel suggested by Brett; (2) I used a piston stop to determine top dead center. About piston stops: Until yesterday, I had never heard of a piston stop, so here is what I know now. THE PROBLEM: It is easy to determine top dead center by looking at the flywheel side or by looking at the arrow on the timing case cover and comparing it to the pulley markings. However, when the flywheel isn't accessible and the timing case cover is removed, top dead center has to be obtained via an alternative method - the piston stop. [note: when adjusting the valve clearance, I just use a blunt screwdriver to determine top dead center, but that method is far too crude when timing the valves.] THE SOLUTION: A piston stop is a device that prevents the piston from going all the way to top dead center. Although ready made piston stop tools are available, I made due with a spark plug that had very long threads (a Champion RE14PLP5). Here's how it works: with the piston NOT at top dead center (just feel with a screwdriver), screw the piston stop (spark plug, in my case) into the spark plug hole and tighten. Next, rotate the crankshaft clockwise VERY SLOWLY AND CAREFULLY until the piston comes into contact with the piston stop. Write down the value that is shown on the degree wheel. Then, repeat the proceedure by rotating the crankshaft counterclockwise. Again, write down the value that is shown on the degree wheel. Top dead center is the mid point between these two values. For those interested, I will be adding a section about valve timing with more information to my website over the next few days. Regards, Greg Bender 1971 Ambassador 2000 Quota http://www.thisoldtractor.com/gtbender Your free subscription is supported by today's sponsor: ------------------------------------------------------------------- Get a Great Credit Card for You Today You can find a credit card to fit your credit needs. All types of credit cards -- 0% APRs, Rewards, & Bad Credit. http://click.topica.com/caacpgdb1dfltb7N01Nf/411Web ------------------------------------------------------------------- |
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<P>Greg,</P>
<P> I assume that your timing method will work for other bikes as well? My Eldorado runs like a clock, but my 1967 Triumph Tiger is way out, and I recently obtained a degree wheel but was kinda clueless as to exactly what I should do with it....</P>
<P>By the way, your web site is the greatest!</P>
<P>Bill </P>
<P>73 Bronze Eldo<BR></P>
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