PowerLevel Valves, Exhaust Manifold, Rear Suspension

[balcom robin s]

Hi there - some questions...

1. Inside the Power Level valves are some o-rings - are they regular
o-rings, with a round cross-section, or are they some kind of special, with
something other than a round cross-section? I found some regular o-rings,
size 007 & made of viton, which I'm going to try, but I wanted to know if
they're correct.

2. To those who are resurfacing both the head and the exhaust manifolds to
fix the exhaust leaks - what are you doing about the oil dipstick tube on
the left side? It's quite a close fit already.

3. Has anyone ever seen anything other than air bags fitted to the rear
suspension? Perhaps coil springs, rubber springs, or ??? I built a utility
trailers a few years ago with swing axles like the GMC, but with a leaf
spring, rather than air bags. I initially thought about using some kind of
air suspension so I could lower the back of the trailer down (by letting the
air out of the air bags) for loading motorcycles, but I went with the leaf
springs to keep things simple. So it got me thinking about designing
something different for the rear of the GMC - simpler, with the sacrifice of
adjustabiltiy.

Inputs, anyone?

Robin

 

[thomas g. warner]

Since the power level control uses standard o-rings, does anyone have the
dimensions and o-ring size? O-rings are readily available at Home depot and
it would be nice to try the repair.

>
>Robin,
>1. I have replaced the O-ring in the Power level valves before. They are
>standard O-ring, no funny cross section or anything. Make sure you get the
>tightest size that will fit ...we bought some that were the same size as the
>ones we took off of the old valve, and due to stretching of the old rings, the
>new ones we bought were too big (any pressure above 50 psi would blow the
>valve out).
>
>2. I have not seen anything but air bags on a GMC. I would wonder about the
>usability of anything that I couldn't adjust manually since the coach rides so
>low in the back. I can't find the address here, but someone has a web page
>with a display of the Four Bag air system. Maybe someone else has the address
>of that web page and could post it.
>Good Luck,
>
>MJ Ladd
>walkawayl
>1973 Canyon Lands
>
>