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Old 08-07-2016, 06:35 PM   #1
Join Date: Jul 2016
Posts: 14
Oil leaking from Radiator fan motor

So I have this oil leaking from my radiator fan motor right where it meets the blades. Nor sure if it's caused by to much pressure or a bad seal. I drove the bus about 2500 miles to get it home. It did great and cruised. I did however need to stop need refill about 1qt of oil to reservoir for the cooling system every couple hundred miles.

Thanks in advance for any advice.

Ben Alth is offline   Reply With Quote
Old 08-08-2016, 12:06 AM   #2
Join Date: Mar 2011
Location: Port angeles, Wa
Posts: 248
Year: 90
Coachwork: bluebird conventional
Chassis: international
Engine: dt466
Rated Cap: 72
I'm hoping you misquoted yourself. You added oil to the cooling system? you just opened a giant can of worms. Water goes in the cooling system, not oil.
We need more details on this fan motor. Are you talking about the hydraulic motor that drives the fan on an R E bus?
bluebird90 is offline   Reply With Quote
Old 08-08-2016, 12:27 AM   #3
Bus Nut
Join Date: Jun 2016
Location: Orange County, CA
Posts: 574
Year: 1990
Coachwork: integral
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
You have a hydraulic fan motor? Yes, they can leak either internally (like mine was) or externally (like it sounds yours is). What make of motor do you have? Maybe a seal kit is available, providing that the bores inside are not worn and that the gears still mesh tightly?

I have a Webster YC fan motor - seal kits for YCs are on eBay, but only for the pumps, not the motors that use higher-pressure seals. QCC is the current maker of YC pumps and motors, so I had them make me another exact replacement to go with my new Multi-Wing fan. My motor was simply not turning fast enough due to internal leakage, contributing to my bus's chronic overheating issues.

Iceni John is offline   Reply With Quote
Old 08-08-2016, 06:00 AM   #4
Join Date: Jul 2016
Posts: 14
Yeah, hydraulic fan motor is leaking oil out towards the fan and the fan is the shooting all over the engine compartment. I will clean it off today and see how the fan is spinning.

Will it be easier to just replace the hydraulic motor apposed to fixing seals in it?
Ben Alth is offline   Reply With Quote
Old 08-08-2016, 07:22 AM   #5
Bus Crazy
Join Date: May 2016
Location: Georgia
Posts: 1,048
Year: 2001
Coachwork: Blue Bird
Chassis: IH
Engine: T444E
Rated Cap: 14
I assume you topped off the hydraulic system, and *NOT* the coolant using oil?
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Old 08-08-2016, 07:29 AM   #6
Join Date: Jul 2016
Posts: 14
Yes, assumption is correct
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