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Author Topic: Engine Drive Belt Tensioner  (Read 742 times)

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britinusa

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Engine Drive Belt Tensioner
« on: February 19, 2018, 03:47:58 PM »

It bugged me that it was so difficult to get the tension on the drive belt tight.

I had read that it should allow a 1/2" deflection of the drive belt, but getting that with a long lever between the engine and the alternator was nearly impossible.

So I made a tensioner.

http://www.sailingeximius.com/2018/02/tensioning-engine-drive-belt.html

Paul

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Paul & Peggy
1987 C34 Tall Rig Fin Keel - Hull # 463

See you out on the water

Engine:M25XP

KWKloeber

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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

KWKloeber

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Re: Engine Drive Belt Tensioner
« Reply #2 on: February 19, 2018, 04:18:16 PM »

Kurt's much more elegant belt tensioner/bracket:

http://c34.org/bbs/index.php/topic,9212.msg69637.html#msg69637

k
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

britinusa

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Re: Engine Drive Belt Tensioner
« Reply #3 on: February 19, 2018, 05:54:56 PM »

Yep, seen and followed those.

Mine is easy to produce, low tech, and does not compromise the existing tension system.

KISS - but the others lead me to the concept.

:)

Paul
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Paul & Peggy
1987 C34 Tall Rig Fin Keel - Hull # 463

See you out on the water

Engine:M25XP

Dave Spencer

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Re: Engine Drive Belt Tensioner
« Reply #4 on: May 07, 2018, 05:09:39 PM »

Also in the spirit of low tech solutions, I cobbled together this modest tensioning tool this week.  I used a 1/4" Stainless Steel Stanley Turnbuckle that I picked up cheap at Princess Auto and a couple of 1/2" thick plastic pieces that I had cut off from a cutting board I made for over the sink.  I cut a groove in the plastic to allow the eye of the turnbuckle to be centred on the pulley.  It's important to minimize the protrusion of the bolt that holds the plastic onto the alternator end of the turnbuckle to prevent it from fouling on the alternator fan blades.  The thickness of the 1/4" bolt head was fine but the nut side would interfere with the fan blades. 
This is not a finely crafted tool but it does the job and is small and light enough to stow with spare belts so it's always available.  I love Kurt's built in tensioner that Ken referenced above but that's way beyond what I can do with the tools and skills that I possess.
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Dave Spencer
C34 #1279  "Good Idea"
Mk 1.5, Std Rig, Wing Keel, M35A Engine
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britinusa

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Re: Engine Drive Belt Tensioner
« Reply #5 on: May 08, 2018, 03:52:16 PM »

Nicely done Dave.

Another cat skinned  :D
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Paul & Peggy
1987 C34 Tall Rig Fin Keel - Hull # 463

See you out on the water

Engine:M25XP

kh3412

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Re: Engine Drive Belt Tensioner
« Reply #6 on: May 08, 2018, 05:14:30 PM »

Time to start marketing
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1987 mk1 a work in progress #618
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