What are the symptoms of a bad fan clutch? - Chevelle Tech
Heating & Cooling Heating, cooling and air conditioning

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 6 (permalink) Old May 18th, 02, 1:07 PM Thread Starter
Lifetime Premium Member
Jimbo
 
Join Date: Mar 2002
Location: Baton Rouge, La
Posts: 349
How can you tell if a fan clutch is bad? I found one with a 772 fan that appears to have leaked a little fluid but still has resistance if you turn it. Also are these cluches supposed to lockup completely when hot?
chevyjim is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old May 18th, 02, 7:17 PM
Senior Tech Team
 
Join Date: Mar 1999
Location: waldorf maryland usa
Posts: 1,774
I would stay away from a leaky clutch, one of the symptoms is that the engine sounds like an airplane. The fans usually lock up at about 160 degrees.

------------------
Leo Paugh
Maryland Chevelle Club #017
A.C.E.S.#3731
progress has little to do with speed, but lots to do with direction.
Maryland Chevelle Club
chev64 is offline  
post #3 of 6 (permalink) Old May 18th, 02, 11:20 PM
Super Mod
Rich
 
Join Date: Oct 1999
Location: Waverly, NE USA
Posts: 13,751
Garage
No, they do not lock up entirely when hot. A hand turn while hot or cold won't tell you much really. If it has leaked oil consider it shot. Even a little oil loss makes them work poorly since they don't have much oil in the first place.

------------------
NCOA member #220 ACES member #1670
Team Chevelle #998 YesterYears Chevys #52949
American Muscle Car Association #142
Rich's 1965 Malibu SS Restoration Project Progress Page
Rich-L79 is offline  
post #4 of 6 (permalink) Old May 19th, 02, 1:01 AM
 
Join Date: Apr 2002
Location: Melbourne, FL
Posts: 1
I have heard the test is when you shut the engine off. If the engine is hot, the fan should stop soon after you turn it off, not spin freely.

sound right?
Ed Norris is offline  
post #5 of 6 (permalink) Old May 19th, 02, 11:28 PM
Gold Founding Member
 
Join Date: Aug 1998
Location: the Seasonally Frozen Wastelands
Posts: 10,560
They can fail in many ways.

1. Any fluid leakage means it's toast.

2. They can seize solid. That's the "sounds like an airplane" way.

3. They can fail to engage. Engine overheats.

4. With the clutch firmly bolted to the waterpump, any fore/aft play in the fan blades means the bearings are shot. This often happens before the bearings lock up, as in #2 above. If the thing craps out the bearings badly enough, the fan goes through the radiator. Ouch.
Schurkey is online now  
post #6 of 6 (permalink) Old May 20th, 02, 8:39 AM Thread Starter
Lifetime Premium Member
Jimbo
 
Join Date: Mar 2002
Location: Baton Rouge, La
Posts: 349
Thanks guys, I think I will get a new one and be safe.

------------------
LS 5 1970 Hardtop M21 3:42 / L34 1970 Convertible TH400 3:42
chevyjim is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome