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Bosch Motor 12v
Hi All,
I’m looking for a way to rebuild my Webasto drive motor (if that’s possible). I’ve checked with Prevost for a “rebuild kit” and or replacement, but all they have is a 24v motor for $526.10. I found a 12v from Liberty for $501.00, but it seems a little crazy to spend that much for a new motor when I should be able to be rebuilt this one. I’ve tried Granger and some local electric motor repair shops for parts but no joy. I called http://www.suremarineservice.com as well and they told me that Webasto has a corner on “their” parts and you have to buy them “whole”.
Any ideas?
Thank you!
Fred
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12 Replies
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Fred,
Take the following with a grain of salt. I seem to remember that there was an engineering change on the Websto 7 or 8 years ago and it was to replace the original motor because of problems, and if my brain is working right it is because the original motor was not up to the job of handling the loads from the pump.
My reason for mentioning this is because if that is an original motor you may be better off with a new one rather than rebuilding one that might not have been up to the loads imposed.
Just remember this is coming from my memory banks which now require “post its” to function. I suggest you check with the folks that handle Webasto parts.
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Any motor/starter/alternator shop should be able to rebuild it. There isn’t much to a typical electric motor. The failure is likely the brushes–an easy and cheap fix. It’s worth investigating.
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Hi Jon, I hadn’t heard that about the motors, interesting. I’m still
figuring out this whole Webasto furnace thing and this is the first time that I’ve
had mine apart. They don’t seem all that complicated (famous last words). I
took apart the 12v drive motor this afternoon and it all looked good to me, I tested it and it
runs fine. I looked at the fuel pump too and that seems to be ok as well. When I
fire the furnance up it spins for about 10-15 seconds then clicks for couple more seconds and then shuts
off. I checked to see if it was getting fuel and the line was bone dry so I figured maybe the
motor or the fuel pump? I should mention that the first thing I did was replace the fuel
nozzle and check the ignition coil and those are good. I also checked the solenoid and the fuse(s) and all
the obvious stuff that I can see, but no go. There is a sold fuel line
coming from the fuel pump to the center of the nozzle holder. Tomorrow I’ll
check it to see if that has a clog in it. I didn’t know that I should have been running this thing every month, it’s been since last year that it was running, my bad there. I sure hope it’s not the control unit that’s broken, those things are really expensive!
Thank you all for any insight.
Fred
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Hi Gil, when I took the motor apart the brushes were a little worn but still plenty left to burn. It was dirty inside so I cleaned it up and tested it. The motor seems to work fine now.
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Fred,
I just went through the whole process and it’s not complicated, just takes some time and thought to get through all the working parts. Your fuel pump is shaft driven, so make sure that’s working first. There is a fuel solenoid that allows fuel to the pump and mine was sticking. You can hook 12v to the wires and can hear/feel the solenoid open and close if it’s working properly. I found the best way to diagnose the fuel system and see if the nozzle is spraying the mist is to just unhook the coil and lay the head in a position where you can contain the fuel spray. I just used an old towel and turned the unit on for just a few seconds to confirm the fuel nozzle was doing it’s job. You have to put tape over the photo cell to do this.
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Don’t feel bad, you have gained valuable experience and your Webasto works with out financial expenditure.
This is afterall the best result.
JIM
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Thanks Tom, I will test some more tomorrow. I really have fun learning about this stuff. Thanks for the directions.
Jim, you are funny and a great sentiment too. Cheers!
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If Tom and I were to define success for Prevost Community, it would be having all owners comfortable with their coaches.
I think all owers initially are intimidated by their coaches, but by participating in sites like Prevost Community that is a mix of all experience levels the sharing of information and availability of information makes ownership much more enjoyable.
Now Fred we are going to look to you as being our resident Webasto expert.
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No one person could ever take the place of Mango Mike! Before I even owned a
Prevost, I was on the “prevoman” site (and many others) studying what I could learn. One
time, I even talked to Mike himself on the phone, just to pick his brain. He
told me the story of when Jon personally helped him buy his “Mothership” even going
with him to do a PDI! I told Mike “wow that’s like having Elvis come to
your high school and sing a song”!What luck.
The fact is, sometimes it’s hard to admit one’s own limits, but I find that a
little humility (and some scraped knuckles) can put you in the right place to learn
something.
Merry Christmas everybody!
Fred
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My wife supplies me with all the humility I need. The bus just adds the frosting to the cake.
Right after Mike bought the Mothership he put it over the pit and we did a full service on it. The Webasto worked when we checked it out when he bought it, but it did not want to work right when we tried to run it in my garage. So part of Mike’s learning was we cleaned the photocell and it fired off and worked normal. I think it quit again after a while and that was when Mike got into it big time.
At the first POG rally we rebuilt JDUB’s Webasto from his Aquahot on the picnic table.
The Mothership emerging from Casa del Grease Pit. Mango is looking down the driveway thinking to himself that he sure hopes the brakes work. It is a 29% slope
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My Webasto would do exactly like yours. Run through the initial cycle, attempt to light and then shut off.
Turns out I had lost prime in the long fuel line from the tank and the built in fuel pump was not able to reprime quickly enough for the control logic. I simply hooked up an electric fuel pump ($50 NAPA) to reprime the line from the tank. Once primed I removed the electric pump and the internal pump was able to keep prime from there.
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Threegreens, Great idea. I think that this is partly my problem too and would help my situation. Did you put the pump in line before the filter or after?
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