timing chain adj...

seattle##gs · May 26, 2017

just to TRIPLE CHECK...using the correct holdin fixture...ignore the bottom run, only look at the top run and find its slackest point. Adj the tensioner so at this point the chain has the recommended 1/8" movement. Correct? This will leave the chain extremely tight at other points in its rotation.

Rohan · May 26, 2017

Mmmm, I don't know what the Norton instructions are specifically,
but usually for chains you have to adjust at the tightest point.

However, the cam function/valve springs will make the chain tight, artificially - if we can use that word.
Time to turn to the manual, and see what it sez (what a good idea ?).

texasSlick · May 26, 2017

seattle##gs said:
just to TRIPLE CHECK...using the correct holdin fixture...ignore the bottom run, only look at the top run and find its slackest point. Adj the tensioner so at this point the chain has the recommended 1/8" movement. Correct? This will leave the chain extremely tight at other points in its rotation.

According to my Norton Service Manual for Heavyweight Twins (Atlas, Dominator ,G15) the manual states: "To adjust, set the engine with one valve open (to take the tension off the chain) release the two nuts securing the tension slipper, which can be moved to take up any slack in the chain. The normal adjustment is 3/16" checked in the center of the chain run checked in more than one place. A slave cut-away timing cover is a useful device for making these adjustments, which will stop any spring on the intermediate shaft."

I would think the Commando would follow the same procedure with the same 3/16" specification.

Slick

seattle##gs · May 26, 2017

if you're curious...after much fiddling I came up with 1/16" movement at the tight spot and 3/16 at the slack spot. Best I can do.

timing chain adj...

seattle##gs

Rohan

texasSlick

seattle##gs

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