Good ideas -- but rather than seeing a "lock-up" of the hub is it
possible it just just gets more firm?. Testing and detecting that
situation might be more difficult than looking for Lock up. But I may
be wrong. I have a Technical Data book but could not find any info
about the fan clutch -- will try the WSM next...
Larry
On 6/20/2014 2:12 PM, G Mann wrote:
In a perfect world.. the "special fluid" in the fan hub housing increases
viscosity as temperature of the air flowing across the radiator increases,
causing the free wheeling fan to "lock up" to the pulley hub.
On another diesel board I'm active on [Ford Trucks] failure of the viscus
fan hub is a pretty common occurrence, usually while towing a heavy load up
hill [of course] so loads of discussion to draw from.
In that application, it seems it's common for the viscus fluid to be lost
over time, thus losing the ability to respond as required. In that
application, it is possible to disassemble the fan hub and refill / reseal
the hub, and return it to service [rather than pay about $200 for a new
one] . I've never tried it with Mercedes fan clutch, but at next
opportunity, I'll have a look, based on this discussion.
Testing: Since the fan lockup is supposed to be based on temperature, it
seem logical that you could remove the hub and immerse it in heated water
with a good thermometer, while testing to see when, if ever, you get viscus
lockup.
Somewhere, there must be a specification for what that temp should be..
being German made cars..
I would expect the temp to be given within a range, since the lead / lag of
hot air to viscus fluid exchange would be far less than instant..
The thought comes, perhaps a laser digital thermometer could be used to
take on car readings of one that works.. and one that does not.. then
comparative..
On Fri, Jun 20, 2014 at 9:54 AM, Larry Turner <l02tur...@comcast.net> wrote:
I haven't found a good way to test it - haven't found anything in the WSM
but haven't had time to really look. will hopefully have time this
weekend.
The fan drags when the engine is off and the fan turns when the engine is
running (naturally) but as I understand it the fan clutch is supposed to
stiffen as the rpm increases. I assume it does that using the viscosity
of the grease inside it?
Any hints for testing out there?
TIA,
LarryT
91 300D
On 6/20/2014 5:42 AM, John Reames wrote:
How's the fan clutch looking?
They seem to have a shorter lifetime than they ought to.
--
John W Reames
jream...@verizon.net
Home: +14106646986
Mobile: +14437915905
On Jun 17, 2014, at 8:36, "Kaleb C. Striplin" <ka...@striplin.net>
wrote:
My 95 e300 when in stop and go or sitting will get up between that mark
just under red and the next mark under that. As soon as you get going the
temp comes back down. I wonder if I need to replace the radiator?
Sent from my iPhone
On Jun 16, 2014, at 11:45 PM, "Scott Ritchey" <ritche...@nc.rr.com>
wrote:
Hey Larry: Copy all. Must just have been an old age/heat failure. My
126
SD has similar miles but I replaced that radiator (maybe 15 years ago)
with
a Nissens (sp?) when it seemed to be running hot. My old 123 TD had
100K
more miles but PO almost certainly replaced that radiator after a road
debris encounter. Looks like these plastic and alum radiators are
consumables. Thanks for the additional longevity data point. Cheers
Scott
-----Original Message-----
From: Mercedes [mailto:mercedes-boun...@okiebenz.com] On Behalf Of
Larry
Turner
Sent: Monday, June 16, 2014 8:46 PM
Hey Scott,
As long as I have owned this car, since Feb 2006, I have used the
proper antifreeze bought from the MB dealer. No clue about before
that,
but it was leased by a oil company executive in Mass. He said it was
always serviced by their local dealer. That's all I know about the
car's
history -- presently has 234,500 miles on it. I always used full
synthetic oil and changed it between 6000 and 8000 miles. The engine
is in great shape AFAIF - never uses/urns/drips any oil - at least it
never did prior to the overheating event. when I test drove it last
week - before the radiator neck completely failed it ran perfectly.
The T'Stat opened and closed - also, the engine heated and cooled as
the
fans came on and turned off.
Larry T
On 6/15/2014 5:33 PM, Scott Ritchey wrote:
Larry: Do you know if non MB-spec antifreeze was ever run in that
radiator?
Rumor has it that certain non-spec antifreeze types are MBZ radiator
plastic.
Scott
-----Original Message-----
From: Mercedes [mailto:mercedes-boun...@okiebenz.com] On Behalf Of
Larry
Turner
Sent: Sunday, June 15, 2014 1:57 PM
To: mercedes@okiebenz.com
Subject: Re: [MBZ] W124 Overheated
Thanks for those comments Marshall. FYI - and I am not sure why
this
happened, but I pried the broken nozzle piece from the hose and when
it
hit the garage floor it broke into several pieces. It was a
surprise
as I would have thought it would have bounced. it dropped from a
height
of approx 3' BTW -- When I examined it it seemed to be pretty
fragile.
I assume it had broken down due to heat cycling.
Larryt
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