Please carefully reconsider this Post
Originally Posted by Aaron Cake
(Post 11677484)
If your clutch fan can't be stopped by a single finger (wear thick gloves if testing this!) while the engine is running, the clutch is sticking. In which case yes, it is wasting a little power.
Wait, you are a Mod, right? |
Originally Posted by clokker
(Post 11680198)
Unlike most other consumable parts on the car, I doubt people have been regularly replacing their thermoclutches, so chances are excellent that yours is a pretty old example.
Given that the fan is a pretty important component in a very critical system, short of buying a brand new thermoclutch, how can you feel comfortable depending on a part you can't test? The fan clutch is self checking. Is the car cooling? Yep! Fan clutch is working. :) Does it freewheel? Yep! Clutch is working. If one of those conditions is met then it has failed.
Originally Posted by jackhild59
(Post 11680696)
Holy Shit. You didn't say that. Not Really, it's a joke right? Have a mod delete this, please.
Wait, you are a Mod, right? |
Catnip
Originally Posted by clokker
(Post 11679631)
I wish I could find the source because I swear I've read that the thermoclutch operates in the 30-80% lock up range. It never fully disengages nor does it ever fully lock. No matter, the differences would be trivial and hardly relevant in the real world.
Originally Posted by clokker
(Post 11680198)
I've consulted the FSM several times during this discussion and have a question for the thermoclutch fan advocates...
There is absolutely zero specific information about the specs or a test process for the thermoclutch in the FSM. "Push fan with finger and feel for resistance" is as technical as it gets. Hayden sells three different levels of thermostatically controlled thermoclutches: Standard Duty, Heavy Duty and Severe Duty. The main difference in the three clutches is the percentage of fan speed vs. shaft speed at which the fan runs when clutch is engaged and AND DISENGAGED. On page 2 of the spec sheet, Hayden shares that even 'disengaged' the clutch (and therefor the fan) is still turning at a specified percentage of the shaft speed. Specs below, stated in fan speed in percentage of shaft speed: Standard Duty: Disengaged=20-30% Engaged=60-70% Heavy Duty: Disengaged=25-35% Engaged=70-90% Severe Duty: Disengaged=20-30% Engaged=80-90% http://www.haydenauto.com/upload/Hay...n-clutches.pdf So-the thermo-fan clutch NEVER completely disengages, nor does it ever completely lock up. To wit: at 3500 rpm highway speed, the fan is being turned at at least 700 rpm and maybe as much as 1225 rpm IF the fan is completely 'disengaged'. If it is not 'completely disengaged' it is turning the fan faster. Given that some folks consider a running e-fan to be a restriction, should you also consider the mechanical fan running at highway speeds a restriction? :scratch: BTW, Many modern thermo clutch fans have added a electro-magnetic clutch similar to an A/C clutch to permit true freewheeling. My Toyota Tundra worked that way. |
Originally Posted by Aaron Cake
(Post 11680707)
The fan clutch is self checking. Is the car cooling? Yep! Fan clutch is working. :) Does it freewheel? Yep! Clutch is working. If one of those conditions is met then it has failed.
I do hope that people won't take my joke seriously. One should never jam their fingers into an unknown clutch fan without first making sure the clutch isn't seized by turning the fan while the engine isn't running. Then if they really want to stop it while running, an inanimate carbon rod or some other implement is preferred to a finger. http://www.ksbw.com/image/view/-/161...ercing-jpg.jpg |
Put a lime in de coconut and call me in the morning....
|
Hmm..I see you found a pic of the last guy who asked if he should run Regular oil or synthetic..lol!
|
Originally Posted by misterstyx69
(Post 11681172)
Hmm..I see you found a pic of the last guy who asked if he should run Regular oil or synthetic..lol!
|
Originally Posted by jackhild59
(Post 11681326)
These efan threads are a real headache...
|
Originally Posted by Aaron Cake
(Post 11680707)
The fan clutch is self checking. Is the car cooling? Yep! Fan clutch is working. :) Does it freewheel? Yep! Clutch is working.
If you're allowed to say that normal cooling proves the fan clutch is good, what happens when the cooling is abnormal...does that prove it bad? |
Originally Posted by jackhild59
(Post 11680696)
Holy Shit. You didn't say that. Not Really, it's a joke right? Have a mod delete this, please.
Wait, you are a Mod, right? you should try it some time. gloves are not even needed, although its not a bad idea. using a rag is a bad idea, too much stuff to get caught |
Originally Posted by jackhild59
(Post 11680727)
There is nothing special about Mazda's implementation of the thermal clutch. It is a mechanical controlled thermostat on a hydraulic coupling. So since we cannot get technical details from Mazda...
|
Originally Posted by clokker
(Post 11681666)
That "exclusion" method of diagnosis (i.e., "The car is cooling properly ergo the fan clutch is fine") only works if the thermoclutch is the sole part in the system, which it obviously is not.
If you're allowed to say that normal cooling proves the fan clutch is good, what happens when the cooling is abnormal...does that prove it bad? But it's part of standard cooling troubleshooting. If it overheats at low speed and idle, but maintains cooling at high speeds, then it's a fan issue. Thus, check the clutch. If the thing still freewheels when the car is overheating (shut the engine off and try to turn the fan) then you've found the issue. |
Originally Posted by j9fd3s
(Post 11682064)
the specs on the FC fan are in the training manual, Foxed.ca - Mazda RX-7 Manuals
Pretty closely correlates to my numbers derived from the tech sheet a Hayden. Thanks for the training manual suggestion. I have them on my backup drive, but haven't consulted them for years. I had pretty much had forgotten about them. |
Originally Posted by j9fd3s
(Post 11682060)
the technique is important, you don't just jam your hand in there like a stick in the spokes of a motorcycle wheel. you have your hand almost flat to the fan, and since the fan is basically freewheeling, stopping the thing is much less drama than you would think.
you should try it some time. gloves are not even needed, although its not a bad idea. using a rag is a bad idea, too much stuff to get caught I don't have to do some things personally to know it's a bad idea. For example, I knew an old man down at the Napa store who could grab a spark plug wire then spark his dick onto the fender of the car. :shocking: I was in high school and pretty cocky. The old man had bet me that he could do something that I wasn't man enough to do. I lost $5 on that one. True story. |
Originally Posted by jackhild59
(Post 11684765)
I knew an old man down at the Napa store who could grab a spark plug wire then spark his dick onto the fender of the car.
"One giant leap for mankind" and all that. |
Wondering if he actually whipped his dick out and tapped it to the fender. If that's the case, the $5 would be the last of my worries.
That napa sounds a little wild. What with old men sparkin' dicks and all. |
Originally Posted by jackhild59
(Post 11684765)
I'm not saying it can't be done. I'm just saying that it shouldn't be done, especially when suggested on a public forum to an audience containing one or more dumbasses.
I don't have to do some things personally to know it's a bad idea. For example, I knew an old man down at the Napa store who could grab a spark plug wire then spark his dick onto the fender of the car. :shocking: I was in high school and pretty cocky. The old man had bet me that he could do something that I wasn't man enough to do. I lost $5 on that one. True story. putting your finger in the fan, is less dangerous that walking on a carpet with socks on (static charge). the stock fan isn't really coupled to the engine, and has almost no inertia, it stops easily. if you want a challenge stop the house fan with your finger, THAT has power, if you want the napa guy challenge stop the house fan with your bits. so just to recap, if there is a fan i will stop it bare handed. you will pay someone $5 to use their gentleman's sausage as a sparkler. i think we are both right. |
All times are GMT -5. The time now is 03:47 AM. |
© 2024 MH Sub I, LLC dba Internet Brands