Fan movement question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

c10_69 · 04-20-2021, 02:14 PM

I have a truck with a 250 straight 6 and noticed the fan has a lot of movement what would be a possible cause of this ?
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**Stocker** · 04-20-2021, 02:36 PM

Is it a rigid (fixed-blade) fan.... or a clutch fan.... or a flex fan? Got any pics?

**jabborabbo** · 04-20-2021, 04:14 PM

Blade flex?

Movement of blades relative to the hub/pulley?

Movement of fan/hub assembly relative to the water pump?

Does it only do it when you’re playing dance music? :-)

sick472 · 04-20-2021, 04:29 PM

If this movement you are talking about is in a circular fashion...it's supposed to do that - lol. Sorry, I couldn't help myself.

I have known clutch fans to shell out internally and get a bad wobble to them. I could even grab a blade (with the engine off) and move it towards the front and back a good inch. The clutch guts were wiped out.

Other than that, I am at a loss unless the bolts are looses and or missing.

**Wrenchbender Ret** · 04-20-2021, 06:15 PM

It sounds like a bad water pump.
George

**Getter-Done** · 04-20-2021, 06:37 PM

I'm joining in on this one

All questions I can think of have covered.

Pictures would help for sure.

.

c10_69 · 04-20-2021, 06:56 PM

If I grab the fins of the fan I can move it back and forth and up and down
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**Getter-Done** · 04-20-2021, 07:13 PM

Quote:

Originally Posted by c10_69

If I grab the fins of the fan I can move it back and forth and up and down
Posted via Mobile Device

Is it a straight blade fan?
If so your water pump is bad.

.

.

**Ol Blue K20** · 04-21-2021, 04:52 PM

I'm voting "bad water pump ".

GASoline71 · 04-21-2021, 10:38 PM

I'm voting "post a pic".

Gary

**Getter-Done** · 04-21-2021, 11:04 PM

c10_69

We are really nice people

We are trying to help you.

So besides all the good info / and the jokes.

If you take the fan belt loose. What does it feel like then?

.

c10_69 · 04-22-2021, 11:15 PM

Thank you for all the help I have been busy working on the truck getting it ready for summer driving it was in fact the water pump and I replaced it tonight thanks again
Posted via Mobile Device

04-20-2021, 02:14 PM	#1
c10_69 Registered User Join Date: Feb 2019 Location: ny Posts: 15	Fan movement question I have a truck with a 250 straight 6 and noticed the fan has a lot of movement what would be a possible cause of this ? Posted via Mobile Device

04-20-2021, 02:36 PM	#2
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,495	Re: Fan movement question Is it a rigid (fixed-blade) fan.... or a clutch fan.... or a flex fan? Got any pics? __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

04-20-2021, 04:14 PM	#3
jabborabbo Senior Member Join Date: Apr 2013 Location: Podunk, Texas Posts: 739	Re: Fan movement question Blade flex? Movement of blades relative to the hub/pulley? Movement of fan/hub assembly relative to the water pump? Does it only do it when you’re playing dance music? :-) __________________ "It is hard to search for a black cat in a dark room, particularly if it is not there. Especially if this cat is smart, brave, and polite." Sergei Shoigu, Russian Minister of Defense

04-20-2021, 04:29 PM	#4
sick472 Registered User Join Date: Jul 2015 Location: Sedalia Mo. Posts: 1,130	Re: Fan movement question If this movement you are talking about is in a circular fashion...it's supposed to do that - lol. Sorry, I couldn't help myself. I have known clutch fans to shell out internally and get a bad wobble to them. I could even grab a blade (with the engine off) and move it towards the front and back a good inch. The clutch guts were wiped out. Other than that, I am at a loss unless the bolts are looses and or missing. __________________ He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20

04-20-2021, 06:15 PM	#5
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,190	Re: Fan movement question It sounds like a bad water pump. George

04-20-2021, 06:37 PM	#6
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 7,719	Re: Fan movement question I'm joining in on this one All questions I can think of have covered. Pictures would help for sure. . __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

04-20-2021, 06:56 PM	#7
c10_69 Registered User Join Date: Feb 2019 Location: ny Posts: 15	If I grab the fins of the fan I can move it back and forth and up and down Posted via Mobile Device

04-21-2021, 04:52 PM	#9
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 15,834	Re: Fan movement question I'm voting "bad water pump ". __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man

04-21-2021, 11:04 PM	#11
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 7,719	Re: Fan movement question c10_69 We are really nice people We are trying to help you. So besides all the good info / and the jokes. If you take the fan belt loose. What does it feel like then? . __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

04-22-2021, 11:15 PM	#12
c10_69 Registered User Join Date: Feb 2019 Location: ny Posts: 15	Thank you for all the help I have been busy working on the truck getting it ready for summer driving it was in fact the water pump and I replaced it tonight thanks again Posted via Mobile Device



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