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Engine Fan Clutch Problem
I recently noticed that my DDEC3 DD60 series engine was getting a little warmer(205) than normal(200) on the water temp gauge before the gauge needle cycled back down. So I tested the fan clutch low speed relay R78, and high speed relay R79 with a test relay I made by removing tab # 85 from a spare relay. High speed grabs firmly, but nothing on low speed, it just free wheels.
My notes indicate that wire # 555 must be open between the ECM and the relay.
What say you? -
18 Replies
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Don,
My wiring diagram shows 555-19 going to Connector 312. From C312 goes to to C115 Rear Junction box.
Both wire 555-18 and wire 563-18 go to DDEC controlling speed 2 , but only 555 goes through an extra connector before into the connector C115?
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Thanks for trying Ed. The wiring diagram # for mine is D060815 here’s the LINK
I worked with Gil today on a FB page, and we determined the low speed clutch coil is dead(Tango Uniform). So I’ll be shopping for and installing a fan clutch, new?, rebuilt?, a Kendrion Linnig brand or maybe a Horton brand? There are some folks I know that have recently installed a rebuilt oem Kendrion Linnig, about $700.
Any info would be greatly appreciated -
Now the rest of the story. I called ProFanDrive.com today and spoke with Huy(pronounced “We”) and Caroline about needing to order a rebuilt fan clutch from them. They asked me to send them a couple of pics which I did. I dropped Gil Johnson’s name and told Huy that Gil had help me figure out what was wrong with mine. Once we figured out what I needed, Huy said he had one in stock and could ship it today and it was $700. I said OK and I was ready to give him my cc # when he was ready to copy the #. He said no, not now. He would ship me the fan clutch, I could install it, and if I liked it to call and pay for it then, and ship my core back to him, and that there was a one yr warranty. WOW!! For you younger folks, this is the way the world use to work. A mans word was worth something. Huy at ProFanDrive.com still operates that way. AWESOME!
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THANKS LONESTARACE, You just saved all of us a ton of money. We all will need a fan clutch at some point.
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I will definitely keep him in mind when I need a fan clutch. Love dealing with people that still have a concept of old time customer service. Thanks for sharing his information.
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Here’s a great 15 min utube video that Gil made about changing the fan clutch. LINK
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I paid $1,521 to Prevost Parts for a new fan clutch in March and got NO credit for the old clutch that had had its cooling fins mechanically removed.
That’s a really good deal!
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pro fan may give you something for the core worth a call
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We left it behind in Kerrville Texas
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Awesome Lonestar!!!
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I got the rebuilt fan clutch installed. Works fine. While looking around that area to see what the job of changing the fan clutch out would entail , I noticed the fan blades on the Liberty installed 12v alternator have been rubbing and arcing on the large 2/0 + cable that runs from the back of this alternator to the house battery bank. NOT GOOD! Liberty? or someone? had 4 ft of both the positive and negative 12v alternator cables hanging from the intake tube above the alternator. Why? I don’t know. I’m fortunate the cable never made good contact with anything metal or things could have gotten ugly.
I removed the extra cabling. Below is a pic of the bare nearly rubbed thru cable, and the before and after I cleaned things up pics. -
I also just installed my rebuilt fan drive from Profan. Same great service that is talked about here. Did what they promised, when promised and paid once received at my house.
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We Prevost owners experience what I think is a high incidence of fan clutch failures or replacements. I have replaced two on two coaches. Neither replacement was at what I would consider high mileage.
I have expressed some displeasure about a high dollar bus tending to eat fan clutches which in my opinion do not last as long as the belts driving them.
But Tom I believe has provided us with the answer. In a truck or a vehicle in which air is being pushed through the radiator by forward motion of the vehicle he notes the fan clutch rarely engages. It makes sense that if air is being pushed through the radiator by a vehicle doing 60 MPH the fan only has to engage when the engine is working a little harder such as when climbing up a grade.
My fan clutch cycles off and then after a while kicks on at low speed until the temperature of coolant drops and then kicks off again. Depending on ambient temps and the level of the terrain this cycle is frequent or spaced out a little. But unlike Tom’s example this goes on all the time and the end result is a fan clutch likely designed for trucks with a radiator being force fed air our clutches are working continuously and unfortunately wear out quickly.
Having a source for rebuilt or replacement clutches is a good thing to keep in mind for future use.
Now if my back can handle the effort or lifting or holding a clutch at arms length life would be good. If you have never replaced a fan clutch you likely are unaware of the meaning of pain.
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Jon:
So are we to presume that the primary driving reason that Tom liquidated his beautiful Prevost luxury motor coach and replaced it with a very nice box truck was to reduce his fan clutch expense? That’s the conclusion that some of us are arriving at … and rather quickly I might add.
Asking on behalf of other Forum members.
Edit: Added “very nice”
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You’ll have to address that with Tom yourself.
I shared some thoughts with him yesterday and he gave me the finger so I am not going to get into that discussion.
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