| Author |
Message |
Roger
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 19, 2005 - 1:06 am: | |
Has anyone converted a 50DN Alt to the air cooled ones that are available. I use the coach blowers and I need the 300 amps. Can the air cooled take the heat and do they last? I am tried of oil leaks on the output shaft. I have used speedy sleves, new seals, last about 5000 miles and then leaks again. Thanks for your help! |
Sojourner (Jjimage)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 19, 2005 - 5:34 pm: | |
Roger, there is no way to “air cool” oil-cool alternator. It fully encloses design for oil to pass thru passage of stator core.
It is why it compact design for full 270 ampere output. Air cool of this physical size would only put out about 170 to 200 amps.
You can connect two or more alternators output thru rated diode from each to one master terminal.
Truck salvage parts place would have your needs.
Or add second 50DN belted alternator with additional oil cooler & fan
FWIW
Sojourn for Christ, Jerry |
roger
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 19, 2005 - 6:46 pm: | |
Jerry,
I quess I wasnt very clear on my question. I have the 50dn oil cooled now. Some coaches have been converted by taking the oiled cooled DN off, and replaced them with a 300 amp air cooled{like a regular alt} one. You need a new bracket and ect to do this. Some company makes this conversion. I was wondering if anybody has done this?
Peace Roger |
Sojourner (Jjimage)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 19, 2005 - 7:16 pm: | |
I am so sorry, you explain clearly.
Good question who have done it with whatever company's kit.
Wish you well getting help.
Have you check with U.S. Coach and Equipment Sales, Inc. 856 767-3323 or 856 767-4848
Contact: Luke Bonagoura
He will make sure it won't leak if with good oil flow & lube.
FWIW
Sojourn for Christ, Jerry |
DrDave
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 20, 2005 - 3:36 pm: | |
Leece-Neville or Prestolite has a direct air cooled replacement alternator for the 50DN
http://www.prestolite.com/pgs_products/alt_results.php?item_series_id=115&refresh=11140256 33
Dave... |
Buswarrior (Buswarrior)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 20, 2005 - 9:55 pm: | |
Hello.
And the MC8 ran a belt drive air cooled alternator, switching to the direct drive oil cooled, IIRC in the last year or two before MC9. Can't remember if the beltless was a '76 or 77 intro. Sorry, Da Books aren't at hand.
There are some monster amps after market air cooled belt drive alternators out there. See the ads in Busride magazine every month.
400 amps anyone?
All the new stuff is belt drive, using a single wide style belt on the DD S60, S50 etc.
For the MCI 8V71 T-drive crowd, the older belt drive was a matched set of 4 smallish belts to turn that 270amp air cooled alternator. The 4 belt pulley mounted street side, front of the engine(front being towards the front of the coach) and the alternator saddle bolted to the engine cradle, pulley end facing rearwards. Four bolts mount the alternator to the saddle. Choice of an air powered belt tensioner, or a solid bar with threaded adjustment. Mine has an small round air filter mounted on its backside so the dirt isn't sucked in by the fan. I've seen others with no facility for a filter.
Which might be easier? I would be curious if a wide belt pulley might be found which would fit up to the 8V71 shaft, and the right length wide belt being available to simplify acquisition (and ongoing service)of new style alternators to our older equipment?
Finding four belt pulleys to fit the new alternators, or getting the matched sets of belts anywhere but expensive bus parts sources?
Oh, the fun of choosing a strategy of matching old to new for the future!!
happy coaching!
buswarrior |
Buswarrior (Buswarrior)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 20, 2005 - 10:01 pm: | |
Sorry, I forgot to add this:
Can't remember which new coach I saw this on, but the alternators (they run two Bosch units on the new stuff) were being fed ducted air from outside the engine room. Simply a large diameter flex tube attached to backside of the alternator.
Might have been Prevost?
Whoever, must be some busnuts working there!!!
Heat kills alternators, and when they cost over a grand to rebuild, I'm going to steal that idea, when I find some time to apply it!!!
happy coaching!
buswarrior |
Sojourner (Jjimage)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 21, 2005 - 9:03 pm: | |
Roger,
Been is already belt drive, can use air cool unit but install hi-temp duct like what “buswarrior” said. Some alternator’s manufacture makes accessory attachment to rear of case to slip on large spring-flex hose.
If you find used 270 to 300 amps air-cool alternator, be sure to check diode’s condition & visual inspect stator winding, 300a (50DN, 270a don’t have any) slip-ring connection for crack spot-weld.
All six good diodes will have less then .5 volts or less drain when connect multimeters at 12v or 24v between large red alternator’s terminal & red wire (large hot or live), otherwise it will drain battery sooner than normal. If less than 2v re-set meter to next lower range to finer scale.
You can bench test for above result by hook jumper wires from alternator’s rated battery voltage to alternator grd & to one of millimeter’s test lead and other lead to alt’s red terminal.
Most alternator bench tester is not good unless operator understand it. Much meet alternator max amps spec.
Caution, All bad diode alternators will charge some what near max amps spec but growl & heat up quicker & work harder and barely reach max amps spec plus falling while hotter or longer. So be sure you watch him or her to do full test properly.
Keep in mind a rebuild unit is known to have bad diode, poor rebuilder workmanship. Been there from 50’s onward, now retire.
All direct drive 50DN oil-cool should be best choice for the long run………right or wrong..asking Ed @ Jefferson Truck & Bus?
FWIW
Sojourn for Christ, Jerry |
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