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Old 06-26-2017, 11:32 PM   #1
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Fan doesn't turn

I've got a 12V 5.9 in my '98 BB TC2000.

So it doesn't appear that my fan is turning - ever. I haven't taken it long distances since I've mainly just been working on the interior conversion, but we have our first trip coming up and I need to know if it's an issue.

As a side, I'm replacing my belt tensioner this week b/c it's rattles loudly and it's loose. I'm hoping that's related to the fan not turning and once it's replaced everything will work as expected.

Anything else I need to be thinking about?


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Old 06-27-2017, 06:23 AM   #2
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can you spin your fan by hand when the engine is turned OFF? when you say it doesnt turn. not even very slowly? it just sits there? if the fan is connected to the water pump and the belt tensioner is bad it could mean nothing on your bely drive is spinning.. and that means dont drive your bus at all or you will damage it.
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Old 06-27-2017, 07:54 AM   #3
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can you spin your fan by hand when the engine is turned OFF? when you say it doesnt turn. not even very slowly? it just sits there? if the fan is connected to the water pump and the belt tensioner is bad it could mean nothing on your bely drive is spinning.. and that means dont drive your bus at all or you will damage it.
-Christopher


Ah - thanks for that question. So a point of clarification --- it DOES spin by hand, and quite freely. It never turns on when the bus is running.

So yeah - I'm going to let it sit until I get the tensionor done.


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Old 06-29-2017, 05:42 PM   #4
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Tensioner replaced and rattling has stopped. But the fan still doesn't seem to turn on. My mechanic said he saw it turn after a while, and that these fans only turn when they need to - which I have read. Maybe it's fine. Hard to say. Bus runs great though.


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Old 06-29-2017, 09:39 PM   #5
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The fan runs on a clutch which engages when needed, yes.
And that fan clutch is probably electric.
I recommend you install wires to a switch on the instrument panel, so you can run the fan at will. This has been a great help in keeping Millicent's TRANSMISSION cool. Explanation elsewhere hereabouts. But in a nut shell -- turn the fan on when approaching a hill; and also shortly before stopping, to cool the engine a bit.
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Old 06-29-2017, 09:50 PM   #6
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The fan runs on a clutch which engages when needed, yes.
And that fan clutch is probably electric.
I recommend you install wires to a switch on the instrument panel, so you can run the fan at will. This has been a great help in keeping Millicent's TRANSMISSION cool. Explanation elsewhere hereabouts. But in a nut shell -- turn the fan on when approaching a hill; and also shortly before stopping, to cool the engine a bit.


That's an awesome idea. I'll have to find some good info on that.


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Old 07-04-2017, 04:12 PM   #7
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Originally Posted by Elliot Naess View Post
The fan runs on a clutch which engages when needed, yes.
And that fan clutch is probably electric.
I recommend you install wires to a switch on the instrument panel, so you can run the fan at will. This has been a great help in keeping Millicent's TRANSMISSION cool. Explanation elsewhere hereabouts. But in a nut shell -- turn the fan on when approaching a hill; and also shortly before stopping, to cool the engine a bit.


Found the fan clutch wires :/

Crap. Is there any way to reconnect these without taking the radiator out?


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Old 07-04-2017, 05:04 PM   #8
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Clear something up for me first, please: Is this a pusher, or front-engine?
TC-2000 can be either.
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Old 07-04-2017, 06:22 PM   #9
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Clear something up for me first, please: Is this a pusher, or front-engine?
TC-2000 can be either.


Front. I was feeling around and I can feel where the wires got ripped away, but I can't imagine being able to repair them without accessing from the front.


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Old 07-04-2017, 06:40 PM   #10
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Ah. Well... I'm afraid I cannot judge that from here. It is the sort of thing where I would not be able to make that decision for myself until the moment I turn the first wrench.

Taking the radiator out is a lot of work, but it will also let you service tons of other stuff that probably needs it.

The radiator and intercooler are bolted to the fan shroud. The fan shroud is actually the radiator support. Once you know that, it all makes more sense.

I had hecka tough time getting tools on the two bolts at the bottom of the fan shroud. I actually cut clearance in the frame-extension with an angle grinder. Then I cut more clearance before reassembly, so it will be easy next time.

I actually heard of one guy who cut the fan shroud apart, then welded it back together before reassembly. Don't do that. You CAN get to those bolts with a bit of cleverness.

As for the fan clutch itself... it is tempting to wonder why the wires were torn off. I do have a good guess: The clutch in the fan hub is kept from rotating by a bracket on the engine. The physical connection is a piece of rubber, to allow for slight movement. If this were not reinstalled at some point, the wires would have been torn off right away.
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