Early Boggie Arm Bushings

[gary j zingle]

" I was told the bushings were Delrin, but either way, it was
a probably good idea in a bad application. An early effort
to increase greasing service periods?"

I have to agree regarding bad application if it had worked
they would have continued it.

Although the modifications may have been related to
service intervals my theory is that they may have thought
sought the softer material to provide some isolation
between the road and the chassis.

Look at any other suspension, rigid axle or independant,
excepting the GMC and you will find some soft material,
rubber or urethane somewhere to provide some isolation.

Just a theory.

Regards

Gary Zingle
1973 GMC 26 foot

 

[steve canyon]

Gary, now that you've pointed it out, I think you're
probably right. Still, the amazing thing about the GMC is the
stamina of it's fundamental design. Hope to join the club one of
these light-years.

After looking at Ron's schematics though, I'm confused about
how the engine coolant returns from the water heater. They
didn't pump all the coolant through the 5/8" hose and back, did
they? On the other hand, if they did, that would allow
returning the coolant to the inlet of the radiator. If they
didn't, did they return it to the outlet side of the radiator?

This is a project I have on my list for my future coach, so
I'm more than curious...

Regards,
Steve

> Although the modifications may have been related to
> service intervals my theory is that they may have thought
> sought the softer material to provide some isolation
> between the road and the chassis.
>
> Look at any other suspension, rigid axle or independant,
> excepting the GMC and you will find some soft material,
> rubber or urethane somewhere to provide some isolation.
>
> Just a theory.
>
> Regards
>
> Gary Zingle
> 1973 GMC 26 foot