[OFB Cafe] Engine overheating
Rick Bowers
rwbowers at gmail.com
Tue Jul 15 19:19:48 CDT 2008
At Tuesday 7/15/2008 01:08, you wrote:
>From: Rick Bowers
>Sent: Monday, July 14, 2008 8:51 PM
>To: Cafe
>Subject: [OFB Cafe] Engine overheating
>
> > I do suspect the fan clutch. During my flush/fill session, it
> > appeared the fan was turning slowly, so I used a piece of 2x4 and was
> > able to stop it. I could hold it still with my hands while the engine
> > was idling with little resistance
>
>Well, then it's junk. The fan clutch is a
>viscous unit and it should have a fair amount of
>viscous drag even when it's cold. The viscous
>clutch is similar to a torque converter on an
>automatic transmission. It has a pump (turned
>by the input shaft), a stator and a rotor (the
>part the fan blade is bolted to). There's a
>small bi-metallic spring that expands when
>heated and turns a shaft that's connected to the
>stator. The stator either directs the oil
>contained in the unit back to the pump
>(freewheel), or to the rotor (which makes the
>fan spin), depending on its orientation.
>
>With the engine hot (over 200° F) have a helper
>operate the engine at 1,600-2,000 rpm and
>observe the fan. It should be making noticeable
>noise and be spinning at approximately the same
>speed as the water pump pulley. If it appears
>to be freewheeling at all at that temperature the clutch is junk.
>--
>Chris
Since I will most likely need to replace the fan
clutch, what are peoples' thoughts on replacing the fan with:
- A flex fan that has no clutch
- An electric fan(s) -- (to where do I connect a
sensor so it starts/stops correctly?
~Rick
>_______________________________________________
>OfB Cafe - Cafe at ofb.biz
>Brought to you by your friends at Open for Business.
>http://ofb.biz/mailman/listinfo/cafe_ofb.biz
>
>DISCLAIMER: The views expressed on this mailinglist are the personal
>opinions of the author and do not represent those of Open for Business.
More information about the Cafe
mailing list