Overheated Viscous Clutch
08-11-2004, 10:32 PM
#1
Pro
Thread Starter
Join Date: Oct 2002
Location: New Hampshire
Posts: 598
Likes: 0
Received 0 Likes
on
0 Posts
Overheated Viscous Clutch
I note on a procedure to rebuild the viscous clutch for the cooling fan that over heating may/can/will ruin the clutch. Can someone explain just how that is so and what is considered overheating?
08-11-2004, 11:50 PM
#2
Rennlist Member
Rennlist Site Sponsor
The refill procedure suggested using a heat gun or propane torch to heat the clutch to aid in getting the silicone liquid into the unit. If you are heating an aluminum unit with a propane torch and get careless, you can warp the clutch or burn the seals out.
Using a large syringe might be a better way to get the fluid into the clutch.
This did NOT say or imply that overheating the engine would damage the fan clutch.
Using a large syringe might be a better way to get the fluid into the clutch.
This did NOT say or imply that overheating the engine would damage the fan clutch.
08-12-2004, 08:56 AM
#3
Pro
Thread Starter
Join Date: Oct 2002
Location: New Hampshire
Posts: 598
Likes: 0
Received 0 Likes
on
0 Posts
Wally: Thanks for your reply. I used a heat gun to aid in filling the unit with 2 oz. of Toyota silicon oil. Since I have seen no improvement in the cooling while in stop and go traffic (overheats) I was afraid I may have overdone it with the gun and ruined the clutch.
The problem is definitely air flow as she will run fine all day except when as described above. The bi-metal strip warps accordingly and the pressure pin appears to be free. Perhaps a PO has burned the seals out as suggested.
The problem is definitely air flow as she will run fine all day except when as described above. The bi-metal strip warps accordingly and the pressure pin appears to be free. Perhaps a PO has burned the seals out as suggested.
08-12-2004, 09:52 AM
#4
Rennlist Member
Even with a full charge of silicon juice, the fan clutch can only do so much. Does the fan get much more resistant to turn by hand from cold to engine operating temp? Does the fan seem to spin at the belt speed at idle with a hot engine? - and move a lot of air?
If so, you may have another contributing cause to the lack of cooling - like a rad that needs flushing, or a condenser or rad front full of leaves and bugs ( they love to get between the condenser and rad). Just something to check, if not already done, prior to replacing the viscous clutch.
If so, you may have another contributing cause to the lack of cooling - like a rad that needs flushing, or a condenser or rad front full of leaves and bugs ( they love to get between the condenser and rad). Just something to check, if not already done, prior to replacing the viscous clutch.
07-05-2005, 07:18 PM
#6
Addict
Rennlist Member
Rennlist Member
Does any of you have toyota's part number for the viscous fluid to refill the clutch ?
I asked the dealer here and they have no idea of what i'm talking about .
I asked the dealer here and they have no idea of what i'm talking about .
Trending Topics
07-05-2005, 11:07 PM
#8
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Try 08816-06001 its thicker
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
07-06-2005, 12:19 AM
#10
Rennlist Member
After failing to fix my viscous with a refill, I converted a LandRover viscous and fan to fo fit on the 928 shaft. If that fails, they are MUCH cheaper to buy than Porsche, and will just screw off the LHT nut fitting.
jp 83 Euro S AT 49k
jp 83 Euro S AT 49k
07-06-2005, 06:58 PM
#11
Addict
Rennlist Member
Rennlist Member
Thank you guys , i just ordered from toyota part # 08816-03001 they did'nt recognize the other #.
is there something i should know before i attempt to fill it ? i know mine needs a bit of that liquid , should i empty it first and put new stuff or just add what it takes ?and when will i know if full ?
I have many kind of syringes to do the job but i heard some tried to heat the clutch ?
is there something i should know before i attempt to fill it ? i know mine needs a bit of that liquid , should i empty it first and put new stuff or just add what it takes ?and when will i know if full ?
I have many kind of syringes to do the job but i heard some tried to heat the clutch ?
07-06-2005, 08:02 PM
#12
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
https://rennlist.com/forums/928-forum/209243-running-a-928-without-a-thermostat.html
If this link does not work search for "running a 928 without a thermostat.
Look for the link in Wally's post.
All the info you will need.
I went with the 08816-06001 as it is thicker oil.
Only bought it a couple of days ago so I know the number is current.
Good luck
If this link does not work search for "running a 928 without a thermostat.
Look for the link in Wally's post.
All the info you will need.
I went with the 08816-06001 as it is thicker oil.
Only bought it a couple of days ago so I know the number is current.
Good luck
