Recent Posts

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Bus Topics ( click here for quick start! ) / Re: Leaking oil "down tubes" on 8v71

« Last post by muldoonman on Today at 07:03:09 AM »

Blow by? Rings ain't sealing good and combustion pressure being forced through worn rings down into the crankcase.  Be my guess.

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Bus Topics ( click here for quick start! ) / Leaking oil "down tubes" on 8v71

« Last post by Seann on Today at 06:10:03 AM »

Finally got under our bus...there are 2 what look like upside down dipstick tubes on either side of the engine, one is dripping constantly while running. What's their purpose, and what's this a sign of? It's not overfilled...
Thanks,
Seann

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Bus Topics ( click here for quick start! ) / Re: Why won't B500 with WTEC III shift into gear from shift pad?

« Last post by belfert on Today at 05:08:28 AM »

No sane person would ever think that turning on the electric brake would kill the transmission.  It was only after poring over the electrical schematics that I realized that the electric brake switch goes through the transmission.

I was reasonably sure I left the switch on so I figured it couldn’t hurt to try turning the switch off.

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Bus Topics ( click here for quick start! ) / Re: Why won't B500 with WTEC III shift into gear from shift pad?

« Last post by CrabbyMilton on Today at 04:04:41 AM »

Sometimes it pays not to draw conclusions too soon. We look forward to some pictures at some point.

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Bus Topics ( click here for quick start! ) / Re: Why won't B500 with WTEC III shift into gear from shift pad?

« Last post by belfert on October 08, 2025, 05:43:36 PM »

Fixed!  The guy at the car lot was so curious if it was the electric brake switch that he went over to the lot and looked at the bus.  He found the electric brake switch to be in the on position.  He turned the electric brake switch off, and the transmission works fine after that.  He was able to go forward and reverse with no issues.  I am planning to fly out to get the bus on Sunday.  I already delayed my trip from last weekend as the front brake chambers were not replaced yet.  The front brake chambers are replaced now.  (I was able to change my flight with no change fee.)

I am almost certain now that the Telma electric brake has been removed.  I recall seeing the same drive shaft as my bus, and not thinking anything of it at the time.

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Bus Topics ( click here for quick start! ) / Re: Propane routing 102DL3 (96)

« Last post by Iceni John on October 08, 2025, 05:37:45 PM »

what do you guys think of using this stainless corrugated stuff in a bus? Would you do it or not?

Jim

I use 1/2" ProFlex CSST throughout my bus.   I like it!   It installs easily, and with continuous unbroken runs I need no intermediate fittings or connections between the manifold and each appliance;  the fewer the connections and joints, the less chance of leaks.   I can't understand why NFPA 1192 seems so averse to it.   To protect it in exposed areas I run it inside 3/4" EMT conduit, and where the line to the emergency generator runs through the front wheelwell I also put the EMT there inside some thick-wall stainless pipe for added protection.   So far, so good.

John

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Bus Topics ( click here for quick start! ) / Re: Why won't B500 with WTEC III shift into gear from shift pad?

« Last post by belfert on October 08, 2025, 05:16:14 PM »

I have been looking at the electrical schematics for my Dina.  My schematics are dated 1997 so not sure if anything changed with the WTEC III.

Anyhow I see the Telma electric brake switch is connected to the WTEC.  I suspect the Telma has been taken out.  I turned on the electric brake while on my test drive, and may have left it on.  Any chance the electric brake switch being on is causing issues?

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Bus Topics ( click here for quick start! ) / Re: 1964 GM PD4106 Service Brake Stuck on

« Last post by djanspach on October 08, 2025, 05:14:41 PM »

Yes -

Our bus is a 6V92T Detroit with the Allison V730 automatic.  So its always in neutral when parked.
We tried a couple different combinations of foot on the brake - put it in gear.  Off the brake - put it in gear.  To the most extreme in gear off the brakes and giving some throttle.  I did this in both drive and reverse. 

I am hoping its something simple.  ;-)

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Bus Topics ( click here for quick start! ) / Why won't B500 with WTEC III shift into gear from shift pad?

« Last post by belfert on October 08, 2025, 03:07:21 PM »

I flew out to look at a 1999 Dina about ten days ago.  However, the transmission on the bus no longer goes into drive.  I took the bus out for a twenty or thirty minute drive where everything was working fine.  I parked the bus back at the car lot, and turned it off.  They wanted me to back up the bus into the spot it had been sitting.  I backed up a ways, but I needed to pull forward because they wanted it over further.  The bus would no longer shift into drive.  I turned it off, and started it again to no avail.  The bus hasn't moved from that spot since I left as it won't shift into drive anymore.  They got someone to replace the front brake chambers as one of the Rotochambers was leaking air bad.

I am pretty sure this B500 has a WTEC III.  Any ideas why a B500 with WTEC III won't shift from the shift pad?  Could there be an interlock with the entry door, or with the entry step?  I am going to look over the wiring diagrams.

I am starting to wonder if this is a sign I shouldn't buy the bus.  I already spent almost $500 on a plane ticket, but I would rather throw away $500 than spend $5,000 on a bus that I can't drive due to transmission issues. 

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Bus Topics ( click here for quick start! ) / Re: 1964 GM PD4106 Service Brake Stuck on

« Last post by Dave5Cs on October 08, 2025, 12:56:12 PM »

Just an Idea but did you have it in Neutral and then when aired up put 100 lbs of pressure on the service brake pedal to release them and then go forward or reverse?