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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #11  
Old 09-19-2019
Dieselbird01's Avatar
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Quote:
Originally Posted by Alever View Post
Brian,
I was wondering is yours a DDEC1 or a DDEC 2? I seen where some 91 WBs could be either engine computer system.
I took the 2 for granted but I wanted to check.
That would impact the troubleshooting.
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Originally Posted by captainbb View Post
Allen I can only tell you what I have been told and that it is a 2, no sure how to check.
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Originally Posted by Alever View Post
Send us a picture or two of the upper part of the engine. That is where the DDEC 2 ECM lives. It sits right behind the water crossover pipe and is under the turbo Y inlet connector.

A couple pictures would help the brain trust out here in WOG land. I believe the DDEC 1 has two different ECMs and looks different than the DDEC 2.
88's had the DDEC I and "maybe" even a few 89's but I doubt that any 91's had a DDEC I.
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Titusville, Florida
1991 40' WLWB-WTB
Body Number F095567
My Location: http://www.bbirdmaps.com/user1.cfm?user=4

1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001
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  #12  
Old 09-19-2019
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I have found the problem or at least a problem. The air cylinder which attaches to the transmission is shot. Not sure if it was operable or not before I tried to get it out but it is now. What I believe was happening is the cylinder was very loose in the bracket and every time the air turned on if the cylinder did work it wore itself out flopping around in the bracket. The inlet hole would not allow me to screw the pipe fitting in it was stripped, so I decided to take it out and finished destroying it in the process. So not positive it will solve my problem but I know I need a new cylinder any thoughts on where I might find one?
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Brian Gibler
EAGLE CREEK, Oregon
91 wb 40
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  #13  
Old 09-19-2019
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What is the diameter and length of the air cylinder?

What is the diameter and length of the rod?


Rod end thread is 1/4-28
Air input thread is 1/4" NPT



blue bird cylinder #1422302 but unable to cross to anything, so the above is needed to match with a Clippard cylinder.
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Barry & Mary Rhodes
Port St. Lucie, FL.
1990 WB 40 "Northern Lights"
Body #F92929
brhodes51@yahoo.com
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  #14  
Old 09-19-2019
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Originally Posted by captainbb View Post
I have found the problem or at least a problem. The air cylinder which attaches to the transmission is shot. Not sure if it was operable or not before I tried to get it out but it is now. What I believe was happening is the cylinder was very loose in the bracket and every time the air turned on if the cylinder did work it wore itself out flopping around in the bracket. The inlet hole would not allow me to screw the pipe fitting in it was stripped, so I decided to take it out and finished destroying it in the process. So not positive it will solve my problem but I know I need a new cylinder any thoughts on where I might find one?
Five hours and they didn’t see that!

I would say they owe you your money back!
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John Wyatt
Titusville, Florida
1991 40' WLWB-WTB
Body Number F095567
My Location: http://www.bbirdmaps.com/user1.cfm?user=4

1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001
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  #15  
Old 09-19-2019
captainbb captainbb is offline
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Totally agree John but they didn’t charge me for the 5 hrs. They just didn’t pass the audition, kinda sad cause they are the authorized Allison and Detroit dealer I was hoping for better!

Cylinder is 1/4” diameter rod which sticks out of cylinder 3” and the cylinder is about 5” for an overall length of 8”. It has one threaded hole which I believe is 1/4” mpg.
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EAGLE CREEK, Oregon
91 wb 40
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  #16  
Old 09-19-2019
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The main cylinder must be 3/4" or 7/8" in diameter which is what I need to know to size the replacement.
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Port St. Lucie, FL.
1990 WB 40 "Northern Lights"
Body #F92929
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  #17  
Old 09-19-2019
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Clippard has the following:

If the main cylinder is 3/4" in diameter then use SRR-12-3 for Reverse or SSR-12-3 for Single Acting
If the main cylinder is 7/8" in diameter then use SRR-14-3 for Reverse or SSR-14-3 for Single Acting
These are SS cylinders with 5/8-18 threaded base mount w/nut and air inlet port on the bottom near the mount like the original. It has a 1/4-28 threaded rod with a 3" stroke.

This cylinder only comes with a 1/8" NPT so you will need to install a brass 1/4" to 1/8" male adapter or you could ask them if they could rebore the air port to 1/4" NPT and get it with side porting and heavy spring which is 5lb resting and 10lb compressed. Standard spring is 3lb resting and 6lb compressed.
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Last edited by brhodes; 09-19-2019 at 08:10 PM.
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  #18  
Old 09-19-2019
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I helped Joe Garner replace the cylinder on a 93wb,i was thinking it was a spring return?
Its been a few years,so i may be wrong.
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  #19  
Old 09-19-2019
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You are right Randy as I just checked mine and it has no exhaust port and is a spring return.
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1990 WB 40 "Northern Lights"
Body #F92929
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Last edited by brhodes; 09-19-2019 at 08:10 PM.
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  #20  
Old 09-19-2019
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Quote:
Originally Posted by Randy Dupree View Post
I helped Joe Garner replace the cylinder on a 93wb,i was thinking it was a spring return?
Its been a few years,so i may be wrong.
Quote:
Originally Posted by brhodes View Post
You are right Randy as I just checked mine and it has no exhaust port and is a spring return.
I think the retarder control valve is spring loaded so that it retracts into the valve body on it's own and that the air cylinder just pulls it up.

Also, for what it's worth, I think "CompAir" made the air cylinders.
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Titusville, Florida
1991 40' WLWB-WTB
Body Number F095567
My Location: http://www.bbirdmaps.com/user1.cfm?user=4

1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001
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