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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #11  
Old 09-21-2009
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Randy Dupree Randy Dupree is offline
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the alternator is a 50DN i think.
it weighs 100LBs.
When i repair the leaks in mine i will take pics.
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2000 LXI 43
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  #12  
Old 09-21-2009
Stephen Stephen is offline
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it is 50 dn
usually powered to 24 volts for over the road buses
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  #13  
Old 09-22-2009
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12V for the Pt-42's

The 50 DN is a classic.

Prevost used the 24V for years and is still offering them on new coaches.

When I asked around Nashville the question is why would you switch to something else?

I have a rebuild for 2.5 years now, runs strong and yes it leaks, not enough to worry about, rebuid with core exchange $600.

I never see any big problems, spikes or any issues with the 2-3000 Watt Xantrex inverter/chargers and the 50DN.

But I would like to stuff one these air cooled jobs in the next time I need a new alternator.




http://www.penntexusa.com/PX-8.htm

I will warn you these alternators are expensive!

$2400 for a new one and the conversion kit is handsomely priced as well.
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  #14  
Old 09-22-2009
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When we broke down near Syracuse a year ago, Penn Detroit Diesel would not believe that it was a 12 volt alternator, not 24. They had some difficulty locating a 12 volt. Had several 24s on the shelf. They finally found a shop that could rebuild one and ship it. It was right around $1300 for the rebuilt one, and the installation and trouble shooting the electrical system was extra. I have been looking for a good deal on one just to have a spare on hand.
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  #15  
Old 09-22-2009
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To get back to the question at hand,
I have done this repair with success.
The oil leaking is a result of an oil seal,a gasket and an o-ring.

1.Remove the pulley (impact wrench is best) 34MM I think.
2.You will see a plate with a few bolts attaching it to the alternator body.
3. Remove this plate revealing a gasket,oring and roller bearing.
4. Clean off the gasket and inspect the bearing as previously posted.do not remove the bearing, they are nearly lifetime when lubricated,(you know its getting oil because it's leaking there)
5.The plate holds the oil seal, replace with a new seal and lube the sealing lip.
6.Reinstall the gasket, oring and seal plate and pulley attach nut and washer and torque down and you are finished.

Copy down the number of the Alternator (1117860) and take it to a truck parts srore or a good NAPA store and they will supply it in either an OE kit or the pieces separately, simple job other that on some coaches a brace in in the way but I think you can work around it or remove it.
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  #16  
Old 09-22-2009
rrueckwald rrueckwald is offline
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Fred, wow, what more could I ask? Thanks. I'll get to it before the trip south. The other oil leak is from the larger hose on the bottom. Coachcraft tried to fix it in March, but didn't succeed. From what I am reading on this thread, I think I will just keep cleaning it up. It is almost impossible to get a wrench on that thing and no place to turn it. Gotta have a little leak, I guess.

Thanks again to everyone for all the information that came out on this subject. All part of the learning process.
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  #17  
Old 09-22-2009
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Very happy to be of help
Let me know if you need any more help.
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  #18  
Old 09-22-2009
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Fred,i knew you had done that repair,and i was hoping you would join in.
Mine is leaking at the main body O-ring or from the hose on the bottom,i'l going to take it apart and re-seal the entire unit.
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  #19  
Old 09-22-2009
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Hi Randy
I hope for your sake it is the hose,but if it is the alternator.
You are of course correct,there appears to be two big o-rings found when you seperate the case,one in the front 3rd of the housing and one in the last 3rd housing.
Once again I hope it is the hose.
wish I was there to help.
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  #20  
Old 09-23-2009
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I think the DN 50 is like the 8V92, it just leaks.

I would use some lock-tite one the 6 bolts on the pully end. Mine leaks there and will quit for a while when periodically tightened.

After a few months the pully end started to leak, the Co. I bought the reman from put in new gasket and o ring under warranty, it stayed dry for a few months.

I also had new hoses installed and after 2.5 years they now leak a bit as well.
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