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- Dec 10, 2008
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- 7,253
Hydraulic timing chain tensioner
Since the first 1000 miles with the new tensioner has gone so well on my bike I thought I would make a few available. I am still considering them in the R&D stage as I have only fitted them on 4 bikes so far and as we know there are no two Nortons that are just alike. Love it or leave it return option.
This tensioner does have the ability to move back in so your timing chain will not be overtightened as the engine warms up.
It is fed by oil splash in the timing chest so no oil pressure connection is needed.
Here is the wear on my rubbing block after 1000 miles.
Here is where a modification may be needed. I had to make extra clearance on 2 of the 4 bikes I have fitted so far.
This is one place that should be checked for clearance. 3 of the bikes had clearance between the ledge on the tensioner and the intermediate gear. One bike had less than zero clearance so I had to re-install the thin plate that was under the original tensioner to space the hydraulic tensioner out a bit. Is suspect the lack of clearance was because an earlier style intermediate gear had been installed in a Mk3.
Before installing the tensioner you would immerse the tensioner in oil with the hole up and pump the shoe until the air is purged. Don't allow the plunger to come out of the body or you will be picking up several small pieces.
There is a hole in the top of the tensioner where a piece of wire or welding rod is inserted to unseat the check ball inside and allow the shoe to retract.
To set the initial chain play a .040 feeler or plug gauge is placed between the shoe and the tensioner body. Then while holding pressure down on the body the bolts are tightened. This gives enough clearance that when the engine warms up the chain will not be too tight.
I only have a dozen of them from the first run. The body is aluminum/bronze so they should wear pretty much forever. I may eventually switch to aluminum to reduce the material and tooling cost and make them a bit lighter.
If you want one send me a PM or contact me at comnoz2@juno.com. Jim
Since the first 1000 miles with the new tensioner has gone so well on my bike I thought I would make a few available. I am still considering them in the R&D stage as I have only fitted them on 4 bikes so far and as we know there are no two Nortons that are just alike. Love it or leave it return option.
This tensioner does have the ability to move back in so your timing chain will not be overtightened as the engine warms up.
It is fed by oil splash in the timing chest so no oil pressure connection is needed.
Here is the wear on my rubbing block after 1000 miles.
Here is where a modification may be needed. I had to make extra clearance on 2 of the 4 bikes I have fitted so far.
This is one place that should be checked for clearance. 3 of the bikes had clearance between the ledge on the tensioner and the intermediate gear. One bike had less than zero clearance so I had to re-install the thin plate that was under the original tensioner to space the hydraulic tensioner out a bit. Is suspect the lack of clearance was because an earlier style intermediate gear had been installed in a Mk3.
Before installing the tensioner you would immerse the tensioner in oil with the hole up and pump the shoe until the air is purged. Don't allow the plunger to come out of the body or you will be picking up several small pieces.
There is a hole in the top of the tensioner where a piece of wire or welding rod is inserted to unseat the check ball inside and allow the shoe to retract.
To set the initial chain play a .040 feeler or plug gauge is placed between the shoe and the tensioner body. Then while holding pressure down on the body the bolts are tightened. This gives enough clearance that when the engine warms up the chain will not be too tight.
I only have a dozen of them from the first run. The body is aluminum/bronze so they should wear pretty much forever. I may eventually switch to aluminum to reduce the material and tooling cost and make them a bit lighter.
If you want one send me a PM or contact me at comnoz2@juno.com. Jim
