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I've gotten a few requests for my mod instructions. Just PM me with you e-mail address and I'll shoot it off to you.
Fan clutch solves overheating
- Thread starter landtank
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Cruiserdrew
On the way there
Some feedback...
I've had a new fan clutch for months sitting on my workbench atfter a heating (but not overheating) situation in Death Valley in March. Since then, I've been running a used old style fan clutch that I had filled with 1 tube of 6k and 1 tube of 3k fluid. No problems with that.
After reading this thread, I just empirically drained the old fluid out of my new blue fan clutch and added 2 tubes of 6k fluid,
Observations:
A/C blows noticably cooler
When exiting the freeway and stopping at a light there is much more "roar" from the fan. I assume it heat soaks and locks up more completely in that circumstance.
I did a 3 mile climb at full throttle and did not see a budge in the needle-I assume it's cooling well.
It does unlock at cruising speed as it should. Ali's experience is an odd one.
I did not adjust the clutch itself.
Overall, I think I did a good thing, but the jury is still out on the fuel consumption issue.
I've had a new fan clutch for months sitting on my workbench atfter a heating (but not overheating) situation in Death Valley in March. Since then, I've been running a used old style fan clutch that I had filled with 1 tube of 6k and 1 tube of 3k fluid. No problems with that.
After reading this thread, I just empirically drained the old fluid out of my new blue fan clutch and added 2 tubes of 6k fluid,
Observations:
A/C blows noticably cooler
When exiting the freeway and stopping at a light there is much more "roar" from the fan. I assume it heat soaks and locks up more completely in that circumstance.
I did a 3 mile climb at full throttle and did not see a budge in the needle-I assume it's cooling well.
It does unlock at cruising speed as it should. Ali's experience is an odd one.
I did not adjust the clutch itself.
Overall, I think I did a good thing, but the jury is still out on the fuel consumption issue.
alia176
SILVER Star
That's good news Drew, thanks for the feedback. I'll take it apart again and drain it properly. Oh yeah, I definitely have too much in my blue clutch since very little came out AND I put in 2 tubes. I may have to buy another 2 tubes since I may not be able to drain the new stuff separately from the old stuff!
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On the blue hub, does it release? I have added a tube to new blue hubs, without draining any, with good results. From my observation the reservoir has the capacity for the extra tube. As long as it releases, freewheels when cool, your good to go.
alia176
SILVER Star
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She doesn't wanna let go
Then it gots too much.
If it's pulling well, the fluid is good, just pop it open and drain a tube worth, a syringe works well for sucking it up and measuring.
why not just eliminate the fan clutch?
http://www.perma-cool.com/Catalog/Cat_page23.html
We rarely run over 4200 rpms....could be a viable solution?
I am talking with them now...they are going to talk to R&D and see if they have them for 1FZs, and if they have them I am buying one.
http://www.perma-cool.com/Catalog/Cat_page23.html
We rarely run over 4200 rpms....could be a viable solution?
I am talking with them now...they are going to talk to R&D and see if they have them for 1FZs, and if they have them I am buying one.
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With a direct-drive coupling, I would be worried about a water crossing forcing the fan blades into the radiator and a further reduction in my less than stellar gas mileage.
I'm having good luck with my original fan clutch with the fresh silicone fill thus far. The AC blows colder and I can now hear the fan at times while I'm driving. I still need to test drive it on some 100F-plus days and do the grab-&-start test to make sure it isn't over-filled.
I'm having good luck with my original fan clutch with the fresh silicone fill thus far. The AC blows colder and I can now hear the fan at times while I'm driving. I still need to test drive it on some 100F-plus days and do the grab-&-start test to make sure it isn't over-filled.
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hmm, the water crossing comment is a good one. I have seen a lot of older rigs with full time fans and they seem to do fine in water.
I am not concerned with fuel economy. Mine sucks, will suck, oh well
I am not concerned with fuel economy. Mine sucks, will suck, oh well
semlin
curmudgeon
there is a thread by gold boy with a link to a supplier in saskatchewn who sells toyota fit fixed hub fan kits that will work.
the problem other than mileage is they will suck power which leads to you being in the wrong gear for highway hills which leads to lugging which leads to heating up the motor more than the fan clutch compensates. when i tweaked my fan clutch to open very early for towing, I found I couldn't go up hills empty without turning off the o/d or I would heat up.
the problem other than mileage is they will suck power which leads to you being in the wrong gear for highway hills which leads to lugging which leads to heating up the motor more than the fan clutch compensates. when i tweaked my fan clutch to open very early for towing, I found I couldn't go up hills empty without turning off the o/d or I would heat up.
I can play with gearing though. It sucks that much power? The highest I go is 5000' max over here in the east...
semlin
curmudgeon
it's not like it morphs into a 3FE but there is a noticeable loss of pep that throws the gearing off a little. feels like you have a full load when empty or like you have a small trailer when full.
it's not an altitude or a steep hill issue. it does this on sustained climbs gentle enough for the tranny to hold it in od. it won't actually overheat but I can see the temp rise on the modded gauge with od on and then watch it cool still going uphill if i flip the o/d off.
but there is a noticeable loss of pep that throws the gearing off a little. feels like you have a full load when empty or like you have a small trailer when full.it's not an altitude or a steep hill issue. it does this on sustained climbs gentle enough for the tranny to hold it in od. it won't actually overheat but I can see the temp rise on the modded gauge with od on and then watch it cool still going uphill if i flip the o/d off.
no problem...no OD on hills I may try 20,000 cts oil and see if that is a nice medium ground.
I may try 20,000 cts oil and see if that is a nice medium ground.hmm, the water crossing comment is a good one. I have seen a lot of older rigs with full time fans and they seem to do fine in water.
I am not concerned with fuel economy. Mine sucks, will suck, oh well
Do they have metal fans? I would think the plastic fan on the 80 could definitely plow into the radiator.
I am actually trying something different. Getting a flex fan with a spacer to run from perma cool. Stainless blades, etc that are engineered to flex based on RPMs to get max CFM. They claim it robs less HP because of the fan blade design than a stock clutch/fan setup.
Should be interesting
Will post up results when they get here...
771-23750
771-85170
From www.jegs.com ($77 bucks shipped)
Should be interesting
Will post up results when they get here...
771-23750
771-85170
From www.jegs.com ($77 bucks shipped)
What ???? , is there an adjustment on a fan clutch?????
if so where and how.
Thanks
Rob
if so where and how.
Thanks
Rob
semlin
curmudgeon
maybe read the whole thread.
murf
Lifer
2 weeks ago, put on the blue hub fan clutch, changed my coolant mixture to 60% water / 40% coolant, new radiator cap, and towed a trailer from Phoenix to Heber, AZ gaining 4000 feet in the climb up north. This in July in Arizona. Granted no stop and go too much on the way but some steep climbs - Im happy to report all went well. Glad I read the threads on the blue hub. Seems to be better around town in stop and go as well. Id recommend the change over for those of you in hot climates
Thanks MUD
Thanks MUD
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A couple of weeks ago our club had a wrenchin day, fan clutches turned out to be a big part if it, IIRC we changed, upgraded 6 of them. This is the one of interest.
It came off of Epic Ed's rig, he bought the rig with an overheating issue and wound up doing a head gasket to solve it. Anyway it had this new generic aftermarket clutch, he wasn't comfortable with it and changed to out for a blue hub.
Turns out that it was a good move, looks new on the outside, but when opened it has issues. The fluid is full of alloy shavings, there is metal to metal contact, looks to be between the shearing surface and the housing. In the third pic the wear marks are evident, that area should be close, but not rub.
The machining and finish isn't even close to a blue hub. It's a much simpler design with very little shearing area evident, there may be more on the backside that we cant see. The fluid appears to be very thick, comparing it to some samples it looks thicker than 30,000, but it's hard to say with the metal in it. That would make sense, make a cheap unit with wide tolerances and cheat it into working with way thick fluid?
It came off of Epic Ed's rig, he bought the rig with an overheating issue and wound up doing a head gasket to solve it. Anyway it had this new generic aftermarket clutch, he wasn't comfortable with it and changed to out for a blue hub.
Turns out that it was a good move, looks new on the outside, but when opened it has issues. The fluid is full of alloy shavings, there is metal to metal contact, looks to be between the shearing surface and the housing. In the third pic the wear marks are evident, that area should be close, but not rub.
The machining and finish isn't even close to a blue hub. It's a much simpler design with very little shearing area evident, there may be more on the backside that we cant see. The fluid appears to be very thick, comparing it to some samples it looks thicker than 30,000, but it's hard to say with the metal in it. That would make sense, make a cheap unit with wide tolerances and cheat it into working with way thick fluid?
