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TR4/4A TR4A Vibration Damper

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SBooth

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The DPO removed the fan and extension; installed an electric fan.
I plan on keeping the electric fan, but have read that the engine needs a vibration damper if the above mentioned parts are removed.
Any recommendations on a vibration damper; source; p/n; installation suggestions; etc.?
Thanks
 
Moss makes a belt conversion kit (part # 837-508). It has a damped crank pully. I've installed it and it works great. I also did the alternator conversion at the same time.

Bill
 
British Frame & Engine also stocks a narrow belt conversion kit which includes an aluminum water pump pulley & a crank dampner. I installed mine many years ago after the stock two part pressed steel pulley flew apart taking out the generator and water pump! I, too, switched to an alternator at that time. Haven't had a problem since. The conversion wasn't cheap, however.
 
Hi,

Yes, Ken at BF&E (www.britishframeandengine.com) is a good source if you want to go all the way with a thin belt conversion. He actually offers two conversion kits. The difference is the damper. The less expensive kit uses a damper that's adapted from something else and has a sleeve pressed in to fit the TR's front crank. There is an rev limit on this one, 6000 rpm if I recall correctly. The kit arrives with the pieces separate and you press the sleeve in yourself.

The other kit has a more expensive but more solidly made harmonic dampener that's rated to 8000 rpm, if memory serves.

So, in other wordes, the cheaper one is all most folks will need.

Kit comes with aluminum conversion pulleys for the generator and the water pump, plus a belt (make a note of the size in case you ever need a replacement). If you are converting to an alternator, too, it will more likely have a thin belt pulley on it already (the alu one in the kit won't fit an alt, it's made to fit the Lucas generator).

Well made stuff and an easy installation, overall.

Yes, the 4-cyl. tends to have some harmonic vibration at several different rpms. It's definitely a good idea to install a dampener, or leave the fan extension in place. The flywheel dampens the other end of the crankshaft, but vibration can travel into the bellhousing and rest of the gearbox, and do damage there, too.)

The kit Moss sells might be the same as BF&E.

I think have seen kits to use the wide, original belt, if you will be keeping the generator or converting an alternator to use a wide belt, but am not certain if the kits are complete with dampener.

A thin belt will reduce load on the engine a little, and is less easily overtightened, which might damage bearings in the alt/generator or the water pump. So, it's a good idea whenever originality isn't a concern.

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