Hello Curt, I think that guy is me!



Sorry, I generally fall a couple weeks behind in my forum reading, and

then keep reading forward to catch up.



I did `repair' in place one of my Pressure Protection Valves. This one

in particular was for the front and drive axel airsprings, located in

the tightest and scariest location I have had to contort myself into,

(in front of the Tag and Drive axels, next to the air drier,

curbside). I could barely see and touch it with my fingertips, let

alone get it disconnected from the 8 air lines, 4 bolts, and

innumerable fittings. A job for a service pit perhaps?!

I removed the 4 screws that held the top on, and took out the

diaphragm, a spring, and a small metal `cap' that protected the

diaphragm from the spring. Pretty simple. The diaphragm was brittle

and cracked. My first thought was to order the replacement PPV, and

switch diaphragms. Unfortunately, the design had changed slightly, and

the new one used a smaller diaphragm. My next idea was to find a

larger piece of material for the diaphragm.



After many phone calls, I talked to a mobile mechanic that told me he

had used the diaphragm material out of a Par water pump rebuild kit,

to repair air pressure valves. He said that he felt it was important

to match the thickness of the material of the original, (.050) in my PPV.

I called a friend and sent him off to a RV store with his caliper,

sure enough he found it right away, a common rebuild part for the

Jabsco Par Pump. It had a bunch of screw holes in it, but enough flat

material to cut out and make 2 diaphragms for the PPV. I think it was

the JABSCO PAR DIAPHRAGM KIT 30015. $15 or so. I used a leather punch

to match the 4 holes that the screws pass thru. I also had to use 2

longer screws to carefully compress the spring, (I could only get one

hand at a time on it), until I could start 2 of the original screws,

then backed out the longer ones and replaced them with the last 2

originals.

The valve opens and closes in the 60 – 65 PSI range, and is still in

place. I have to say that I will replace that PPV when I get the Bird

to a place where I can get better access, not because I think my

repair will fail, (like the original, it might last for another 20

years), but because I still feel a twinge of uncertainty over the

suitability of the material.(???) I will be happy to replace it with

the new PPV, just for the little extra peace of mind.



Sorry for the delay, if there is any way I can be of further help

please call me at (619)972-7890



P.S. Beautiful job on your interior remodel! Also, thanks for the idea

of the coolant filter. When will I ever find enough time to get

everything done??!!



Michael Kramer

1986 PT-40 8v92

San Diego, Ca



--- In "WanderlodgeForum%40yahoogroups.com", "Curt Sprenger"

wrote:

>

> Someone in or near San Diego, CA, that participates on this forum and/or

> Randy's forum, repaired "in place" a 60 - 65 PSI Pressure Protection

Valve.

> Would that someone please speak up. I'd like to communicate with you. If

> anyone knows who that person is please let me know.

>

> --

> Curt Sprenger

> 1987 PT38 8V92 "MacAttack Racing"

> Anaheim Hills, CA

>