[Healeys] Correct V-belt

Sun Mar 23 15:12:06 MDT 2025

Hank,

We may be going down that rabbit hole I mentioned before. Based on the
picture you sent it looks like BN1 and BN2 pulley is for an SAE 7/8 or 28
series (7/8 x 32) series belt. The dimensions of the pulley for the 7/8
belt are:
Effective Groove Width - 0.785"
Groove Angle 34 deg
Groove Depth Min. - 0.709"
Rideout - 0.090" +/- 0.045"

Google "28445 Automotive cogged Belt" and you should see something close.
Since you have a loose pulley may I suggest a trip to a good auto supply
store and see how a 28 series belt fits the pulley you have.

I looked at the belt on the AH Spares website. I will suggest that given
the size of the belt a cogged belt is a better option to more easily turn
around the pulleys. The markings on the AHS belt are a bit of a red herring.

Hope this helps,
Harold

On Sun, Mar 23, 2025 at 12:55 PM Hank Leach <gradea1 at charter.net> wrote:

> Just went back to the AH Spares site and looked at the actual listing for
> the 100 belt. It has rideout and appears to be the correct fit.(photos
> from site) Their notes as follows:
>
> Austin Healey Fan Belt | 3/4-Inch Pulley | BN1 to BN2
>
> "We have had these belts made to the correct O.E. 3/4 inch width unlike
> the reproductions available which sit to low in the pulleys making them
> less efficient and noisy."
>
>
> OE part number:
> 2H4238
> Application:
> BN1 - BN2
>
> Looks like*, if I can afford the shipping charge*, I should get one of
> these correct fitting belts.  It even has the correct part number stamped
> to satisfy concours questions. Hank
>
> --------------------
>
> From: "Harold Manifold" <manifold at telus.net>
> To: <gradea1 at charter.net>
> Cc: "Michael Salter" <michaelsalter at gmail.com>, "Healeys at Autox" <
> healeys at autox.team.net>
> Sent: March 23, 2025 at 11:49 AM PDT
> Subject: Re: Re: [Healeys] Correct V-belt
> Hank et al,
>
> I am not familiar with the pulleys on the BN1 and BN2 other than I have
> been told they are wider than both the 3/8" and 1/2" pulleys on the later
> Healeys. If someone out there has a pulley from a 100 and can measure the
> Effective Groove Width (the width at the top of the pulley) and the groove
> angle (it should be close to 34 deg.) I can determine the right series of
> belt. Length is more difficult.
>
> I will use my 45 year old SAE manuals as opposed to AI.
>
> Harold
>
>
>
> On Sun, Mar 23, 2025 at 11:37 AM Hank Leach <gradea1 at charter.net> wrote:
>
>> Harold-thank you! great article and completely understandable and useful.
>> Now do you have anything about the monster V-belt on the 100?  I think that
>> is the belt both Michaels are talking about. This one is really hard to
>> find, massive and often fitted wrongly thus eating up generator bearings.
>> It was made to be mounted on the original truck(lorry) version 6 cylinder
>> engine and carried over when the 4 (2660cc) was cut down and manufactured.
>> I had nothing but pulley problems during my restoration. Would love to have
>> a number for this one. Original belt part number 2H4238 fitting pulleys
>> 1B1057 crank;1B1024 WP and  1B1727 dynamo. FYI AH Spares says this is the
>> belt:
>> *CHT137
>> <https://www.ahspares.co.uk/austin-healey/big-healey/cooling-heating-cht101-to-cht147/fan-belt.aspx>* *Fan
>> Belt - Correct 3/4" Width
>> <https://www.ahspares.co.uk/austin-healey/big-healey/cooling-heating-cht101-to-cht147/fan-belt.aspx>*  3/4"
>> wide.  Moss has "original type" 021-066
>> Regards, Hank
>> --------------------
>>
>> From: "Harold Manifold" <manifold at telus.net>
>> To: "Michael Salter" <michaelsalter at gmail.com>
>> Cc: "Healeys at Autox" <healeys at autox.team.net>
>> Sent: March 23, 2025 at 9:57 AM PDT
>> Subject: Re: [Healeys] Correct V-belt
>> Michael,
>>
>> I want to save you from falling down the fan belt rabbit hole. A couple
>> of years ago I wrote the attached article for our club magazine. It should
>> help to give you a clear path forward.
>>
>> Harold
>>
>> On Sun, Mar 23, 2025 at 6:17 AM Michael Salter <michaelsalter at gmail.com>
>> wrote:
>>
>>> Michael,  as I recall you are running an alternator on your 100. Has the
>>> original 100 generator pulley been fitted to the alternator, as the
>>> original alternator pulley would definitely require a totally different
>>> belt than would be correct for the 100 pulleys?
>>>
>>> On Sat., Mar. 22, 2025, 8:19 p.m. Michael Oritt, <
>>> michael.oritt at gmail.com> wrote:
>>>
>>>> I went to the NAPA store today to get a V-belt and was sold a smooth
>>>> belt with an FH (Fractional Horsepower) designation.
>>>> The packaging said it was for lawn and household applications of less
>>>> than 1 HP.
>>>> I asked the sales clerk if an FH belt was suitable for automotive use
>>>> and was told "Yes".
>>>> Now I see that Google AI says no--that such a belt is [i]not[/i]
>>>> suitable for cars.
>>>> Who is right--AI or NAPA and if not FH which designation is correct?
>>>>
>>>> Best--Michael Oritt
>>>>
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