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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 03-25-2019
badandy badandy is offline
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Default Air leaks everywhere

Throttle treadle is leaking out of the housing
Tag's dump valve (replacement already here)
The engine fuel shutoff air cylinder leaks when extended

I have the front open and it doesn't look like fun to get that throttle valve out. Is this a WM90DX? It looks like it is, but I can't tell? Are there any standard o-rings in this thing? It's leaking around where the two housing pieces are screwed together, and badly.

The engine fuel shutoff - does it use generic o-rings? I don't have it removed yet so I can't tell what make/model it is.

This is an expensive hobby.
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Old 03-25-2019
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Randy Dupree Randy Dupree is offline
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cut an access hole in the floor so you can get to it.
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  #3  
Old 03-25-2019
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1984Lodge 1984Lodge is offline
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I would like to see what you come up with on the air throttle, my buddy tells me that his is leaking badly as well.. I will probably be the one that will fix it.
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Temple Terrace, Florida
1984 Bluebird PT40
#F063411 6V92TA & MT654CR
& 1986 MCI 102A3
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YouTube-Gino's Garage https://www.youtube.com/user/xjrjeff
http://www.bbirdmaps.com/index.cfm #460
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Old 03-25-2019
badandy badandy is offline
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If it only leaked at WOT I wouldn't worry so much. I might just install a switch labelled "go" and just flip that on and off as I drive.
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Old 03-25-2019
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1984Lodge 1984Lodge is offline
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Quote:
Originally Posted by badandy View Post
If it only leaked at WOT I wouldn't worry so much. I might just install a switch labelled "go" and just flip that on and off as I drive.
Nice, I have driven vehicles that were like that... felt like a toggle switch not an accelerator pedal.
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Jeff LoGiudice
1984LodgeJeff@gmail.com
Temple Terrace, Florida
1984 Bluebird PT40
#F063411 6V92TA & MT654CR
& 1986 MCI 102A3
6V92TA & HT740
YouTube-Gino's Garage https://www.youtube.com/user/xjrjeff
http://www.bbirdmaps.com/index.cfm #460
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  #6  
Old 03-25-2019
LDM680 LDM680 is offline
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Quote:
Originally Posted by badandy View Post
...

The engine fuel shutoff - does it use generic o-rings? I don't have it removed yet so I can't tell what make/model it is.

...
Andy:


Here are some pictures of my engine shutoff valve. The piston seal is a cup style, not an o-ring.


I took mine apart a couple of weeks ago to polish the shaft and remove grooves caused by the side loading of the shut off lever. These grooves along with the dirt on the shaft occasionally prevented the piston from retracting. When this occurred, the engine would spin over but no start.


The picture quality is not very good as I was trying out my new tablet.
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  #7  
Old 03-26-2019
Clueless Clueless is offline
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On the SP, that throttle valve comes out the bottom. One needs really long arms to reach the air fittings, or the air lines can be cut and coupled back together. I think it takes longer to remove and replace the pedal than it takes to change the valve.
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  #8  
Old 04-04-2019
badandy badandy is offline
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I got the shutoff cylinder out and the piston seal was nice, but had a lot of dirt on it. Cleaned/lubed and back in it went without leaks.

The throttle valve went in without issue and passed the soap test. But I could still hear the same leak that led me to the valve. When I sprayed the old valve it was leaking profusely, that is not in question. But the leak I "heard" is still there! Come to find out there's a 1/4" black plastic tube hanging out up there that's leaking a small volume of air and I'm having a hard time figuring out where it goes. I'm thinking it connects to a valve somewhere as an exhaust maybe, and the valve isn't sealing up right. The tube is hanging down in that mess under the driver's feet and goes into a bundle of lines that go up somewhere. Any guesses?

There's no plumbed vent for the air vent doors, seat slide, or suspension dump switches. There's an air horn valve somewhere that might have a vent? I don't know why it would. Would the old air step have had a tube down there?
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  #9  
Old 04-04-2019
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Quote:
Originally Posted by badandy View Post
I got the shutoff cylinder out and the piston seal was nice, but had a lot of dirt on it. Cleaned/lubed and back in it went without leaks.

The throttle valve went in without issue and passed the soap test. But I could still hear the same leak that led me to the valve. When I sprayed the old valve it was leaking profusely, that is not in question. But the leak I "heard" is still there! Come to find out there's a 1/4" black plastic tube hanging out up there that's leaking a small volume of air and I'm having a hard time figuring out where it goes. I'm thinking it connects to a valve somewhere as an exhaust maybe, and the valve isn't sealing up right. The tube is hanging down in that mess under the driver's feet and goes into a bundle of lines that go up somewhere. Any guesses?

There's no plumbed vent for the air vent doors, seat slide, or suspension dump switches. There's an air horn valve somewhere that might have a vent? I don't know why it would. Would the old air step have had a tube down there?
Parking brake valve vent?
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1982 FC33 (sold)
1986 PT40 8v92
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  #10  
Old 04-04-2019
badandy badandy is offline
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Quote:
Originally Posted by Chap View Post
Parking brake valve vent?
Hmmmmmmmmmmm
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