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What peoples feelings on the Cam belt tensioners? - Engine/Ancilliaries - The Lotus Forums Jump to content
Buddsy

What peoples feelings on the Cam belt tensioners?

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Im going to do a cam belt change and wondering if I should change the auto tensioner to a fixed type?

 

buddsy


 

"Belief is the enemy of knowing" - Crrow777

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I wouldnt want to change the cam wheels.

Is the fixed tensioner made for the HTD profile then?

I know Ive seen the auto tensioner from under the car when the engine runs and that its going in and out keeping the tension constant.

 

buddsy


 

"Belief is the enemy of knowing" - Crrow777

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It was my understanding that the semi-auto tensioner was introduced to rectify earlier problems of 'jumpimg' using a fixed tensioner on the trap belt, which was the original Lotus design.

 

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1 hour ago, andydclements said:

When you do the belt change, are you taking the engine out?

Im not planning to.

I was just thinking the auto one has a bit more to go wrong with than the fixed one.

I found the drawing for the fixed one from last time I made a couple for you but forgot the block needs tapping.

So to conclude looks like I keep with the auto.

buddsy


 

"Belief is the enemy of knowing" - Crrow777

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Gates Trapezoidal (early non-HTD) belt-

 

IMG_0019.JPG

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That's the one, no need to change again for at least 100k😀

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The combination of square teeth and the fixed tensioner was the reason for the belt slips on the early Jensen Healey engines. The auto tensioner was introduced to resolve the issue.

To convert to a fixed tensioner correctly would mean replacing all the cam belt sprockets to HTD.


Cheers, Gavin

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