| [GMCnet] Onan Slain! [message #226993] |
Fri, 25 October 2013 09:15  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
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Senior Member |
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G'day,
Those of you that can remember my messages from last summer (2012) even after Emery helped me get it running after I left his home
it began to play up on hot days after running an hour or so.
Troubleshooting pointed to a gas starvation problem so I ordered a new Facet pump (just like the OEM) and a carb rebuild kit. I
never got around to installing them last year but I knew I had to do so before we left this year.
At any rate before we left on this year's tour I removed the old pump and carb. I decided to disassemble the pump to see if / what
was wrong with it. I removed the bottom and the filter. I removed the clip that retains the check valve and removed it followed by
the washer followed by the o-ring followed by the spring and finally the shuttle.
The spring was pressing on the o-ring! HUH?
The order of disassembly SHOULD be clip - washer - O-ring - check valve - spring. I had put the damn thing together WRONG! I
couldn't figger out WHY I did that as I had the manual out when I assembled it and common sense tells you don't have a spring in
direct contact with an O-ring! Yes, it was deformed.
Since I had purchased a new pump I decided to use it so I got new fittings for both the carb and pump to make sure the problem
wasn't bad fittings allowing the pump to suck air. When it was all assembled I said to myself; "I think I'll check this pump before
I install it." I touched the body to the negative post of a spare battery and the wire to the positive post and NADA, NOTHING, REIN,
NICHTS! WTH - A brand new pump that doesn't work? I disassembled it and took it apart but the shuttle wouldn't come out. I took a
block of wood and smacked the open end down hard a couple of times and the "bottom" of the shuttle was exposed enough allow grabbing
it with a pair of needle nose pliers. I pulled it out and it was rusted! I cleaned the rust off with some 400 grit paper and cut a
piece off a green Scotch Bright pad and polished the shuttle bore. I reassembled the pump and it worked fine.
I also rebuilt the carb and the Onan ran just fine during our three month tour this summer.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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