Bluebulldog Posted December 3, 2022 Share Posted December 3, 2022 2000 e7 355-380 engine I put a new fan clutch on it from Mack. Now it seems to never disengage and takes for ever to warm up as it gets colder out. This one of this viscous (one with little coil spring sensor in the middle). Not an air operated one. Did I get a bad one or is that style just troublesome? Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/ Share on other sites More sharing options...
Onyx610 Posted December 3, 2022 Share Posted December 3, 2022 Sounds like you got a bad fan clutch. Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517180 Share on other sites More sharing options...
Bluebulldog Posted December 3, 2022 Author Share Posted December 3, 2022 I contacted Mack seems I got the last one they had. Is there other manufacturers out there that we could cross the part number to that would be this style? Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517185 Share on other sites More sharing options...
Joey Mack Posted December 3, 2022 Share Posted December 3, 2022 The viscous fan clutch is one of the best ones... When you say it stays engaged all the time, do you mean for 10 - 15 while the engine warms up? and does it fade in and fade out as you drive? they start out a bit stiff when cold, but as they warm up they loosen up, and then when heat comes off the radiator, the pigtail on the front grows and allows the oil inside to pass through the veins to grab a hold of the clutch and make the fan rigid, until the air coming in cools off... they are self adjusting.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517189 Share on other sites More sharing options...
mechohaulic Posted December 3, 2022 Share Posted December 3, 2022 when you say "I put a new one on": what time frame are you talking :: week/ day/ yr? engine SHUT OFF and key removed from ignition. can you reach in and turn fan by hand? did the small bi-metal plate fall off front of fan : doubt it did. radiator heat bends the bi metal plate which pushes the pin to let more fluid in fan core thus engaging it which is opposite your situation. when the fan doesn't engage most causes are dirt build up under bi metal plate. back to square 1. if you can not turn fan manually :: WITH ENGINE OFF fan clutch NG. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517191 Share on other sites More sharing options...
Bluebulldog Posted December 4, 2022 Author Share Posted December 4, 2022 Put it on in April. Seem at the time to not disengage I thought. Then this fall my help made the comment thats not ever shutting down. With engine off I can turn the fan but will also slip the serpentine belt some while doing so. I’ll say it is nothing like the one on the granite we have. Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517193 Share on other sites More sharing options...
mechohaulic Posted December 4, 2022 Share Posted December 4, 2022 It's a challenge JoJo not being there as with many questions. "forever to warm up " ==all day/ first few ?? trying to get better (stay on topic ) . wifes '15 subaru 70 degrees out start car high idle 7-9 minutes . shut it off , wait 20 minutes go to start back high idle. Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517194 Share on other sites More sharing options...
Onyx610 Posted December 4, 2022 Share Posted December 4, 2022 2 minutes ago, Bluebulldog said: Put it on in April. Seem at the time to not disengage I thought. Then this fall my help made the comment thats not ever shutting down. With engine off I can turn the fan but will also slip the serpentine belt some while doing so. I’ll say it is nothing like the one on the granite we have. Yea you need two guys to turn those ones on the granite haha Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517195 Share on other sites More sharing options...
mechohaulic Posted December 4, 2022 Share Posted December 4, 2022 2 minutes ago, Bluebulldog said: Put it on in April. Seem at the time to not disengage I thought. Then this fall my help made the comment thats not ever shutting down. With engine off I can turn the fan but will also slip the serpentine belt some while doing so. I’ll say it is nothing like the one on the granite we have. with that info ;i would unfortunately go with faulty fan clutch. cold/ cool engine ; fan clutch should NOT have hold power to turn belt Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517196 Share on other sites More sharing options...
Bluebulldog Posted December 4, 2022 Author Share Posted December 4, 2022 Maybe I should say it won’t stay up to temp setting running idle in a line. And will never warm up if you don’t put a load on it. I really have no doubt it’s not disengaging I guess more the question is where to look to cross numbers to come up with another one. Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517197 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 (edited) the viscous clutch has resistance when cold but will turn.. they hum during warm up, then drop out when the clutch warms up... then when 185 degrees or more if running A/C, comes through the radiator, the pigtail on the front opens up and engages the fluid into the clutch inside the assembly.. serp belt?? -or- no tensioner, alt is on a banana bar? Edited December 4, 2022 by Joey Mack poor sperring.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517198 Share on other sites More sharing options...
Onyx610 Posted December 4, 2022 Share Posted December 4, 2022 24 minutes ago, Bluebulldog said: I contacted Mack seems I got the last one they had. Is there other manufacturers out there that we could cross the part number to that would be this style? What did you get? Yes there are others out there. Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517199 Share on other sites More sharing options...
Bluebulldog Posted December 4, 2022 Author Share Posted December 4, 2022 I’ll have to get the part number Monday Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517201 Share on other sites More sharing options...
mechohaulic Posted December 4, 2022 Share Posted December 4, 2022 JoJo when engine cold the clutch shouldn't have enough engagement to turn the belt : yes /no ?? the fan can be moved by hand with some resistance but not turn the belt.. unless pulling opposite tensioner . stilll that's tight Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517203 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 should not move the belt. ever... if belt tension is correct 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517204 Share on other sites More sharing options...
Onyx610 Posted December 4, 2022 Share Posted December 4, 2022 It is normal for those things to be tight as shit when cold and they do lock in when cold. But usually kick off after about 30 sec of driving down the road. From what you’re saying I’m going to diagnose it as bad. But these guys have been doing this longer then me so take that for what it’s worth. Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517205 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 Onyx.... sir.... He has a viscous fan, not an air op fan.. sorry bud... Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517206 Share on other sites More sharing options...
Onyx610 Posted December 4, 2022 Share Posted December 4, 2022 (edited) Yup viscous fans I have seen lock up when cold for a short period then cut out, that’s on fords anyway. But if thing isn’t cutting out at all the valve is clearly stuck open and it’s trashed. Let you guys handle it though Edited December 4, 2022 by Onyx610 Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517207 Share on other sites More sharing options...
mechohaulic Posted December 4, 2022 Share Posted December 4, 2022 2000 truck ;; fan installed 8-9months ago . they don't have thermostats ? ;; even if it had one, fan clutch when cold shouldn't turn eng belt. gone are the days of installing parts and forgetting them for a couple yrs i guess. Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517208 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 they will turn by hand when cold, and yes, with engine running, they are engaged until they warm up a little, them they are controled by the heat off the cooling pac (radiator, c.a.c., A/C condensor) .. I guess we are saying the same thing in different ways.. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517209 Share on other sites More sharing options...
mechohaulic Posted December 4, 2022 Share Posted December 4, 2022 1 minute ago, Onyx610 said: Yup viscous fans I have seen lock up when cold for a short period then cut out his statement was fan seems engaged while sitting in line (asphalt plant maybe ) . engine can't be running hot enough for fan then . with AC = there's NO computer involvement here correct??. Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517210 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 no computer.... just mechanical operation.. Rare these days... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517212 Share on other sites More sharing options...
Onyx610 Posted December 4, 2022 Share Posted December 4, 2022 1 minute ago, mechohaulic said: his statement was fan seems engaged while sitting in line (asphalt plant maybe ) . engine can't be running hot enough for fan then . with AC = there's NO computer involvement here correct??. Correct. It’s a bimetallic strip. The fans junk Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517213 Share on other sites More sharing options...
mechohaulic Posted December 4, 2022 Share Posted December 4, 2022 rare these days;; common in the good days. understand heat from AC/ radiator ; still go with faulty clutch. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517214 Share on other sites More sharing options...
Onyx610 Posted December 4, 2022 Share Posted December 4, 2022 Just now, mechohaulic said: rare these days;; common in the good days. understand heat from AC/ radiator ; still go with faulty clutch. You did see it’s a 2000 right? Y2K truck 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70819-engine-fan/#findComment-517215 Share on other sites More sharing options...
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