I had to also trim the blades of the stock fan to clear the damper.
Jim
----- Original Message -----
From: "Allen C Miller, Jr." <acmiller@mhcable.com>
To: <healeys@autox.team.net>
Sent: Saturday, August 07, 2004 4:05 AM
Subject: DW harmonic balancer on 100's
> We have been through quite a lot of shop time fitting the Dennis Welch
> harmonic damper to the front end of the M. I wanted to pass this along
some of
> the considerations to those of you who are considering doing it.
>
> 1. The mounting holes are alternately for 6 cylinder and 4 cylinder
> cranks. unfortunately, the degree markings only line up on 6 cylinder
cars. if
> you want to use the permanent 1 degree timing tape, you would have to
remount
> it. We were not convinced it would reattach relably, so we left it in
place
> and painted it over with new TDC and offset markings.
>
> 2. Totally disregard the sketch that comes with the balancer. It
suggests
> a frame cut in the cross member to allow for clearance of the balancer.
That
> is no doubt a concern on the 6 cylinder engines because of the engine's
> closeness to the cross rail, but there is more than ample clearance on the
100
> (5+ inches), and the only clearance concern is a degree of proximity of
the
> forward tips of the hand cranking lug to your radiator fins.We haven'tfit
the
> radiator yet, but it looks like a go with acceptable clearance.
>
> 3. You have to adapt to the narrow belt pulleys to install the
balancer,
> which is a good idea. However, the holes of the stock aluminum AH 100 fan
are
> closer to the centerpoint by a good bitand do not line up with the holes
in
> the DW water pump pulley. The only work around if you want to keep the
> original fan is to fill the holes on the pulley with allumalloy, redrill
and
> retap or use a helicoil thread. This is not as big a hassle as it sounds,
> because there is a tight-fitting projection in the pulley which
automatically
> aligns the fan and the pulley concentrically.
>
> 4. With the combined costs of the balancer and the pulley set,
particularly
> with the dollar/pound conversion, it is an expensive conversion. I have
had
> conflicting advice from respected Healey authorities on whether it is
> essential, even in racing applications, to have the balancer.
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