[Healeys] 100 fanbelts

Mon May 6 11:17:09 MDT 2024

A few comments on fan belts. Cog belts are better for small diameter
pulleys like those found on our Healeys but are not a must have. I am not
sure about 100's but the 6 cylinder Healeys have a 36 groove angle on the
pulleys. Try to find a belt that is close to 36 degrees. The width of the
belt is best determined by Ride-Out.

Ride-Out is the distance from the outside diameter of the pulley to the top
of the belt. For both the 3/8” and ½” pulley Ride-Out should be between
0.015” – 0.105” or about 1/16”. If the Ride-Out is outside of this range
either the belt is worn out or it is the wrong size belt.

[image: image.png]
Note there should be a gap between the bottom of the belt and bottom of the
pulley groove.

To find the right belt for my 3000 I went to a supplier with a large stock
and used trial and error to find the right length and width.

Harold

On Mon, May 6, 2024 at 9:48 AM Hank Leach via Healeys <
healeys at autox.team.net> wrote:

> Great story Bill...that's when $10 was ten dollars. The whole issue with
> Healey belts is the tightness and I have seen quite a few fractured
> generator mounts on the engines from being too tight. There is also a
> caution in the service manual as to burning out bearings in the generator
> if too tight.
>
> When I first saw a 100 belt I was amazed as to it's stoutness-only to be
> outdone by the flywheel! I, too searched far and wide for the proper belt
> and my spare from John Bull turned out to be incorrect. I took the original
> belt to a John Deere store and found one that worked-used on tractors and
> mowers. Just another source for those obscure items that Autozone does not
> carry.
>
> The issue I had restoring my 100 revolved around the improper generator
> pully (as John Harper say there are many) After assembly the belt did not
> line up with the crank pulley-Kent Lambert (dearly departed) supplied the
> proper pulley.  Hank
>
> --------------------
>
> From: "Bill Kollar via Healeys" <healeys at autox.team.net>
> Reply-To: "Bill Kollar" <wkollar at nycap.rr.com>
> To: <healeys at autox.team.net>
> Sent: May 5, 2024 at 6:07 PM PDT
> Subject: Re: [Healeys] 100 fanbelts
>
> This brings to mind a 54 BN1 Fan Belt Story.
>
> Mid to late 60's or so,  I was traveling home, in my  54, 100-4 after
> going to the Sunday afternoon  NASCAR Sportsman/Modified races at Victoria
> Speedway, off Rt 20 in NY.   On the way home I blew a fan belt while going
> through a very small village, a one gas station town.   Since the gas
> station was my only hope to get running again I walked there, went inside
> and discussed the situation with the attendant/owner.  As expected, he did
> not have a Healey belt in stock but he let me rummage through a bunch of
> old belts he had stored in a back room.
>
> It took me about 15 or 20 minutes or so to find a belt that looked as if
> it might fit, close to the proper width and length.  I believe it was a
> belt for some tractor trailer.  He wanted $10.00 for it, I only had $5.00,
> he took the $5 and I was off to attempt an installation.  I cleaned the
> belt, as best as I could and installed It, the fit was not perfect but
> basically okay  It did however protrude slightly higher above the pulley
> than the one that had blown.  I left that belt on the car for a couple more
> years with no further problems.
>
> ------------------------------
>
> On 5/4/2024 4:38 PM, mike brooks via Healeys wrote:
>
> The fanbelt for a 100 should be 3/4" wide and 1/2" deep in a V shape. 3/4"
> wide (19mm) is not a currently standard metric size. I've just bought a
> replacement  belt from one of the usual UK suppliers. It's 22mm wide and
> doesn't sit in the pulleys properly. I then went to another supplier who
> claims to be selling the correct width belt. It turned out to be exactly
> the same 22mm size. I've researched this, and these belts are standard
> modern metric size "C". The belt that came off my 100 ( it had been there
> for at least 20 years and 12000 miles) was a B1130 B43 belt, 17mm wide. It
> sat slightly low in the pulley grooves, but was much more flexible than the
> 22mm belts and was altogether a better fit.
>
> What are others using for their 100 fan belts? Note I don't want to
> convert to narrow belts and pulleys.
>
> Mike
> 56 BN2
>
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