Phil,
Thanks for the response. Last night I pulled the radiator and managed
-with one of those strap wrenches that has never done the job I needed
to do- to remove the nut that secures the pulley. I removed the hub
and pulley, cleaned their mating surfaces and put them back on the
shaft. Plenty of contact, but still no release.
I have several used hubs around, so I picked out the cleanest looking
one and paired it with the existing pulley. It worked perfectly about
60 times, so I figured that it was the hub that was bad and not the
pulley.
I installed a new bearing into the hub, re-torqued the nut and
adjusted the assembly to the specified .014". Before reinstalling the
radiator I tried it about 400 more times and it worked 100% of the
time. Satisfied that I had isolated the problem as being the hub I
buttoned up the system and idle and road tested it. Sacre Bleu, it
works.
The old hub, by the way, looks fine. The springs are intact and there
is no sign of any sort of problem. Maybe I should send it to the
Peugeot Museum for an autopsy?
Thanks for taking the time to respond,
Ken
On Feb 15, 2005, at 7:53 AM, (Phil) wrote:
> Sounds like the outer plate or the inner housing of the clutch has
> become magnetized. It cannot be a winding, as the magnetic flux would
> quickly collapse when power is removed. Seems to me that as soon as
> the torque of the fan is present when you rev the engine, it would pop
> loose, is this not the case?
>
> If it does stay engaged, then maybe a demagnetization is in order.
> The cure might be to hit it with a large reverse-polarity current
> pulse, say like -48vdc for just fraction of a second, and repeat
> every 5 seconds or so for a minute, or until the clutch begins to
> release properly. I know it's obvious, But if you try this trick, be
> sure to disconnect the clutch connector from the rest of the
> electrical system. Reverse polarity means that you would connect (+)
> of your power source to the Engine ground and (-) to the clutch lead.
>
> I have quite a few telecom power supplies that put out sufficient
> current for this, so that's how I'd do it. You could use several
> extra car batteries in series, some battery chargers in series, etc. I
> imagine you could also do it with a DC stick or MIG welder power
> supply set on high.
>
> -Phil
> ----- Original Message ----- From: "kenneth parker" <elkeni@mac.com>
> To: "'Peugeot List'" <peugeot-l@yahoogroups.com>
> Cc: "kenneth parker" <elkeni@mac.com>
> Sent: Monday, February 14, 2005 9:42 PM
> Subject: [Peugeot-L] Fwd: 84 505 XN6 fan clutch problem
>
>
>>
>> I was wondering if anyone has any sort of input that they could offer
>> regarding the below fan clutch dilemma that I am dealing with. Simply
>> put, once the fan clutch is engaged it will not disengage. This
>> happens even with the power off and the brush pulled away from the
>> brass ring at the rear of the water pump pulley.
>> If I pry on one of the leaf springs with a screw driver or tap the
>> pulley with a plastic hammer it will release, but otherwise it stays
>> engaged -even overnight with no power on.
>> I am going to give it a look this evening. I am beginning to assume
>> that it is a problem in the winding of the pulley, so I plan on trying
>> to get it off without having to remove the surgically installed water
>> pump. It looks as if I can do this by removing the radiator and using
>> a strap wrench to secure the pulley while I de-torque the nut.
>> Does anyone out there have any sort of experience removing the pulley
>> without having to remove the water pump? Any input will be gratefully
>> accepted.
>> Also,*** If you do respond to this post, could you send it both to
>> "reply" and "reply all." My software is acting up and all posts
>> directed to the list at large arrive only containing 6.5 lines of
>> copy.
>> Unless you send the reply to me directly it gets cut off on the
>> seventh line.
>> Thanks,
>> Ken
>>
>> Begin forwarded message:
>>
>>> From: kenneth parker <elkeni@mac.com>
>>> Date: February 11, 2005 3:51:01 PM PST
>>> To: 'Peugeot List' <peugeot-l@yahoogroups.com>
>>> Subject: 84 505 XN6 fan clutch problem
>>>
>>> Just yesterday I jokingly responded to someone's post about the Mi 16
>>> saying that the "Mi" meant "More impossible." This hubris clearly
>>> angered the Peugeot gods and they responded by throwing me a fan
>>> clutch curve.
>>>
>>> I just completed a cylinder head replacement complete with new water
>>> pump, hoses, radiator re-core, etc. On the bench I installed the
>>> pulled and hub and even installed a brand new bearing into the hub
>>> (the pulley hub combo worked perfectly 100% of the time prior to my
>>> removing the head). When I installed the water pump I statically
>>> checked the hub about 50 times to make sure that it engaged and
>>> disengaged which it did.
>>>
>>> Now that the job is done I am finding that the hub will engage and
>>> trigger the fan, but it is reluctant to disengage. Sometimes it does
>>> on its own, but not always. The adjustment (.014") is right and it
>>> doesn't disengage at .016" or even when I back the adjusters off
>>> completely and turn the key off. The problem occurs statically and
>>> when the engine is running (a rag and a careful hand show the fan to
>>> still be engaged after the auxiliary fan has shut off).
>>>
>>> If I tap where the hub and pulley come together with a plastic hammer
>>> the hub backs off, but otherwise, once engaged, it clings to the
>>> pulley like a child to its mother's breast. WhEn I installed the hub
>>> both it and the pulley's mating surfaces were clean. All the
>>> electrical stuff (brush, sensor, wires) is virtually new and, as I
>>> said worked perfectly before. The springs on the hub are intact.
>>>
>>> Other than the fact that this job is driving me crazy I have a few
>>> questions:
>>>
>>> 1. Is it okay to just run it as it is (with the proper .014"
>>> adjustment and the hub reluctant to release)?
>>> 2. Does anyone have any input as to what is the problem?
>>> 3. If I run it for a while might it work itself out (wishful
>>> thinking).
>>> Thanks,
>>> Ken
>>
>>
>> [Non-text portions of this message have been removed]
>>
>>
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Received on Tue Feb 15 14:49:59 2005
