Generator vibration

[Scott Forman]

SUCCESS!

I suspected that the fan might be my big vibration source, and after
disconnecting power to it and running the motor I was right.

The vertical radiator and fan on the PT's are designed as a sub-
assembly that comes out in one piece. This subframe attaches to the
coach at three places...two under the radiator and one furter in
towards the centerline. The two mounts under the radiator are rubber-
isolated mounts, and even after all these years they are still doing
a good job of minimizing vibration transfer. The culprit, though,
was the third point. There was a plain metal pin attaching the
subframe to a vertical frame member that is attached to the main left
side frame rail. Vibration from the fan was passing right through
that pin, up the vertical member, and into the main frame. Since the
steering linkage passes through this frame rail, it was allowing
transfer into the steering column and into my hands on the wheel.

To address this problem, I used a floor jack to support the subframe
and removed the metal pin. In its place, I inserted a bolt inside a
length of small rubber hose. With the hose acting as an isolator,
the amount of vibration transferred into the frame is greatly
reduced. I am very happy with the results.

Score one for shade tree engineering.

Scott Forman
86 PT38
Shakin a little less in Memphis

--- In WanderlodgeForum@yahoogroups.com, Hisham Amaral
wrote:
>
> Scott
>
> Mount dampening and isolation in our case is experimentally done,
We do not have the tools needed to do any computer designs to get the
best dampening results. Therefor we have to experiment with different
mounts to get the desired result. My advise is to play with different
durameter rubber mounts that will get you what you want in dampening
the vibration you are getting from your Gen set. I would call
(BB) CCW Engineering to see if they have any off the self mounts that
can replace your existing mounts or would they suggest a vendor that
can work with you to improve your condition.
> I retired from automotive engineering 2 years ago and do not have
any contacts in that area
> I will make a few calls to my old friends at Chrysler to see if we
can get any additional information that can lead you to an acceptable
results.
> Will talk again soon, and good luck,
>
> Hisham Amaral
> 97 WLWB Michigan
>
> --- On Sat, 10/4/08, Scott Forman <scottforman75@...> wrote:
>
> From: Scott Forman <scottforman75@...>
> Subject: [WanderlodgeForum] Generator Vibration
> To: WanderlodgeForum@yahoogroups.com
> Date: Saturday, October 4, 2008, 8:11 PM
>
>
>
>
>
>
> Does anyone have any good tricks for reducing vibration from the
> Yanmar/Kohler generator?
>
> Scott Forman
> 86 PT38
> Memphis
>