| Author | Message | ||
| David Evans (Dmd)
Registered Member Username: Dmd Post Number: 414 Registered: 10-2004 Posted From: 173.68.141.245  Rating: N/A |
Hey fellow bus nuts. We have not had good luck with our fan drive motor. We took it off and had another new seal put in while in Ocala. the hydraulic shop said there is no wear on the shaft or plates and that the seal dident even look bad.But every 300 miles we have to add a gallon of oil. The problem is that the Webster company has been bought by another and parts are scarce and very pricey. So we have updated our obsolete systems with some obsolete systems! I cant help but laugh! that and the drop box and rear differential post! Glad we have that set up now. Oh well they are old buses. The webster drive has a tapered shaft and hub so i will have to replace the drive, hub and fan. Anyone able to steer me in the right direction? We arent really pressed for time now that we are home but i would like to start looking now. Thanks Dave | ||
| larry currier (Larryc)
Registered Member Username: Larryc Post Number: 306 Registered: 2-2007 Posted From: 64.40.62.69 Rating: N/A |
Hey Dave, I have had several different drive setups that all worked fine. I recently scrapped out a 81 Thomas and almost kept the fan drive setup. It looked like it could easily be adapted to several different buses very inexpensively. You may also find a wear-sleve/seal for your app that will solve the problem. Another possibility is a leak in a different piece draining or blowing into the fan drive area. Usually if you have properly repaired something and still have a problem, the problem is something else. Brass fittings will eventually crack after a few million miles and a few big wrenches pulling on them, so you could get lucky there, if you do they will break at the housing side so you need an easy out to remove them. The seal should be ok unless maybe the shaft is jumping up and down so look for some issue with end play, maybe someone left a washer out or something. | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1785 Registered: 12-2000 Posted From: 76.68.120.66  Rating: N/A |
Pretty much all the transits use hydraulic fan drives for many years now. Possible donor? happy coaching! buswarrior | ||
| Larry Higuera (Larryh)
Registered Member Username: Larryh Post Number: 55 Registered: 6-2006 Posted From: 75.209.14.10 Rating: N/A |
Dave, I had the same poblem I thought but found a leak in the line from the air valve that opened the valve so get it clean put some carboad over outside of radiator to make it get hot enough to open the control valves at fast idle and you will soon find the leak and I guarantee you the fan will suck it towards rad and make you think it's the front seal. | ||
| David Evans (Dmd)
Registered Member Username: Dmd Post Number: 415 Registered: 10-2004 Posted From: 173.68.141.245 Rating: N/A |
Thanks for the replies. This pump and fan drive motor came from a transit also but is actuated from a new varible control valve. My concern is the Vebster components being hard to find. Its hard to trouble shoot the leak right now unless idrive it in these temps. Even while in Fla in was extra cold. The motor is towards the rear the fan blade is foward and pulls the air thru the radiator so lucky oil is not plugging rad but ending up all over the sheetmetal inside the rear. Larry H this set up only has the feed and return lines and i can see the oil coming from the fan hub area but only veiwing from the rear. It could be just at high rpms but i dont know. | ||
| Tom Yaegle (Tom_5c)
Registered Member Username: Tom_5c Post Number: 37 Registered: 1-2008 Posted From: 96.247.130.88 Rating: N/A |
David, I have a spare on my shelf. Not sure if it is same as you are running, but i can get a make and model for you if it would help. Tom | ||
| David Evans (Dmd)
Registered Member Username: Dmd Post Number: 418 Registered: 10-2004 Posted From: 173.68.141.245 Rating: N/A |
Thanks Tom, i called Tim H. this week and he had some good ideas and i am going to pull the drive motor tomorrow and see if it has a plug or port that has been plugged. I never noticed one but will check. Mine has a 1"inlet and 1" return port and 2 bolt flange. Once i have some diamensions i will let you know. | ||
| Tom Yaegle (Tom_5c)
Registered Member Username: Tom_5c Post Number: 38 Registered: 1-2008 Posted From: 96.247.130.88 Rating: |
Dave, I looked and I have a 1/4 port on the rear of mine. I ran it back to the tank. I think this is a case drain which would keep preasure from the front seal. Tom Y | ||
| David Evans (Dmd)
Registered Member Username: Dmd Post Number: 420 Registered: 10-2004 Posted From: 173.68.141.245 Rating: N/A |
Well the overpressure port was staring me right in the face! Its not on the pump but on the pressure fitting into the pump. there is a flared fitting with a new cap on it. So where do i route the excess press oil? do i need to tap a fitting into the oil tank? anybody (Tom Y)know how the return line is plumbed? i will post a pic on the busface picts since i wont have to downsize the shot. | ||
| Tom Yaegle (Tom_5c)
Registered Member Username: Tom_5c Post Number: 39 Registered: 1-2008 Posted From: 96.247.130.88 Rating: N/A |
Dave, I will try to foward the hyd diagram for a Gillig bus. This is the set up I have on my MCI. I would think you should run that line back to the tank. Even if you tee into the return at the tank. Some may say tie into the return at the motor, which should work but... The line on my motor is a case drain not presure release, and i ran it back to the tank. Tom Y | ||
| David Evans (Dmd)
Registered Member Username: Dmd Post Number: 423 Registered: 10-2004 Posted From: 173.68.141.245 Rating: N/A |
It is too cold in the evenings to get any work done outside the bus which might be a good thing. I got so excited about the fitting off the pressure inlet fitting being the cure, but after thinking more about it, it seems from the location of the fitting it will have the same pressure from the pump to the motor, ALL of the time, not just when over pressure.At least this is what i am thinking. And again, i will have to wait till it warms up a tad to test anyway or take it for a run and see waht happens when the fan kicks on. i cant post the pic here because of sizing issues but its in the facebook for buses pics. Any thoughts or ideas welcome, Thnks dave |
