RX7Club.com


Go Back   RX7Club.com > Generation Specific > 1st Generation Specific (1979-1985) > 1st Gen Archive
Sign in using an external account
Register Forgot Password?
Register Photos FAQ Members Search Today's Posts Mark Forums Read VendorsUsed Cars TSB & Recalls Garage
Welcome to RX7Club.com

 
 
 
 
 
LinkBack Thread Tools Search this Thread Display Modes
Old 08-24-07, 10:07 AM   #1
Beginner RotorHead
 
Trader Score: (0)

Join Date: Mar 2007
Location: Boise, ID
Posts: 39
(COOLING)How does the Fan Clutch Work?

I have been troubleshooting a cooling issue on my 1982 GS for the past few weeks and I have replaced just about everything. Upper/lower rad hoses, OEM thermastat, thermastat gasket, water pump gasket, and boiled the radiator.

The day I put everything back together and ran it, the temp was perfect (It sat at about 3/8th on the Temp Gauge). That was after city and about an hour of highway driving. However, the next day the temp gauge was back to where it was before I replaced everything (5/8th on the gauge) after a less than an hour of city and highway driving. When I turned on the heater, the temp gauge went back to 3/8ths. Both days, I drove it around the same time and the outside temp was about 78ish.

I searched the best I could on the forums and looking in my Haynes manual. I found a few ways to troubleshoot the radiator fan. When the engine is cold, the fan spins freely and stops after about 3-4 times around. When the engine is at operating temp, the fan still spins 3-4 times around. Are there any other ways to troubleshoot it?

My questions are: Is my fan clutch/drive damaged/broke? And for my information, how does the fan drive/clutch work?

Note* I read another thread that mentions the need to have the lower engine compartment cover on to help the cooling system. I will placing that back on tonight.
__________________
1981 Rx-7 GS "Rachel" AutoX Project (Non-Running)
1982 Rx-7 GS "Cynthia" Restore Project
*Troubleshooting Cooling System again
1987 Nissan v6 4x4 Pickup "Hank" (Dead)
1999 Ford v6 Mustang "Dolores"
Rx7UnitOne is offline  
Old 08-24-07, 10:19 AM   #2
Rotor Power Rules
10 Year Member
 
Bruceman's Avatar
 
Trader Score: (5)

Join Date: Jul 2001
Location: Rochester Hills, MI
Posts: 508
http://en.wikipedia.org/wiki/Fan_clutch

Here it tells you what to do to determine if the clutch is bad http://www.landsharkoz.com/tt/ttvfc.htm
Bruceman is offline  
Old 08-24-07, 11:18 AM   #3
Waffles - hmmm good
5 Year Member
 
t_g_farrell's Avatar
 
Trader Score: (1)

Join Date: Jul 2004
Location: Huntersville, N.C.
Posts: 4,595
Your clutch on the fan sounds like its toast. Also that bottom cover helps to force the air through the radiator, without it your temps will rise. At 78 degrees ambient that guage should be less than 1/3. Get the fan working and the shroud back on and see whats next. You may need to replace the oil cooler lines as well. I found that magically cured my own temperature problem.

A cooling tip
t_g_farrell is offline  
Old 08-24-07, 11:34 AM   #4
Beginner RotorHead
 
Trader Score: (0)

Join Date: Mar 2007
Location: Boise, ID
Posts: 39
Thanks for the info Bruceman.

T_G, I was hoping those lines were okay because it ran well the first day and the second day it was fine after I turned on the heater. I am saving for new oil lines, since I spent my monthly car project budget trying to fix this cooling issue.
__________________
1981 Rx-7 GS "Rachel" AutoX Project (Non-Running)
1982 Rx-7 GS "Cynthia" Restore Project
*Troubleshooting Cooling System again
1987 Nissan v6 4x4 Pickup "Hank" (Dead)
1999 Ford v6 Mustang "Dolores"
Rx7UnitOne is offline  
Old 08-24-07, 11:43 AM   #5
Too old to act my age
5 Year Member
 
Rogue_Wulff's Avatar
 
Trader Score: (0)

Join Date: Feb 2005
Location: Tulsa, Ok.
Posts: 3,164
You said at operating temp, the fan will spin 3-4 times? That's a little too loose at temp. As the temp gets warmer, there should be more resistance in the clutch. However, not having that lower pan in place will compound the problem.
In stop and go traffic, the fan does all work. Once out on the highway, there should be enough airflow to keep it cool. Without the lower pan, the air can go under, rather than thru, the radiator.
Putting that back in place should help, but you may still need to replace the fan clutch.
__________________
Rotary Engine = Simplicity at it's most Complex
With only 3 moving parts, what could be Simpler?
With 30 metal seals, and 30 springs, how can it be any more Complex? Easy, add Boost and/or Fuel Injection.....
Rogue_Wulff is offline  
Old 08-24-07, 01:50 PM   #6
Wankel Whisperer
10 Year Member
 
ray green's Avatar
 
Trader Score: (12)

Join Date: Jul 2002
Location: jefferson, georgia, 30549
Posts: 8,863
Here ya' go:

http://www.youtube.com/watch?v=Oi7BANPkh-Y
ray green is offline  
Old 08-24-07, 04:01 PM   #7
No Sleep, No Food
5 Year Member
 
Rx-7Doctor's Avatar
 
Trader Score: (13)

Join Date: Jul 2004
Location: Oregon
Posts: 10,603
Your fan clutch is bad, end of story.
Rx-7Doctor is offline  
Old 08-24-07, 04:19 PM   #8
Beginner RotorHead
 
Trader Score: (0)

Join Date: Mar 2007
Location: Boise, ID
Posts: 39
Thanks everyone for your help/advise.

doc, +1 for archiving?
__________________
1981 Rx-7 GS "Rachel" AutoX Project (Non-Running)
1982 Rx-7 GS "Cynthia" Restore Project
*Troubleshooting Cooling System again
1987 Nissan v6 4x4 Pickup "Hank" (Dead)
1999 Ford v6 Mustang "Dolores"
Rx7UnitOne is offline  
Old 08-24-07, 04:19 PM
RX7Club
Mazda RX7




Paid Advertisement


 
 
 
 

Tags
cluch, clutch, clutches, cooling, fan, long, older, pickup, radiator, replacing, rx7, supposed, turbo, work, works

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Is the cooling system hard to work on, or do I suck at picking mechanics? Neep 1st Generation Specific (1979-1985) 9 06-11-07 09:52 AM
Clutch Fan Cooling. -=1OneShotNO2=- 2nd Generation Specific (1986-1992) 1 11-28-06 07:29 AM
Clutch work? J_Lee18m 1st Generation Specific (1979-1985) 17 09-11-06 07:52 AM
Cooling intercooler...New idea...Will it work??? peacekeeper 2nd Generation Specific (1986-1992) 32 01-31-03 07:49 PM


All times are GMT -5. The time now is 02:34 PM.
All content Copyright 2007 by Internet Brands, Inc.

Contacts

SEO by vBSEO ©2010, Crawlability, Inc.