68 C20 with 327 excessive fan noise

[Accelo]

I just looked closer. You have a fan clutch on it.
The lower p/s pulley on the crank is nothing I have see before.
However, it the belts line up I wouldn't worry about it.
The function is it as worked for over 50 years.

I have included a picture of a standard crankshaft power-steering pulley as a reference.

[cjoenny89]

Originally Posted by Accelo

I just looked closer. You have a fan clutch on it.
The lower p/s pulley on the crank is nothing I have see before.
However, it the belts line up I wouldn't worry about it.
The function is it as worked for over 50 years.

I have included a picture of a standard crankshaft power-steering pulley as a reference.

I am pulling it off tonight as I have time to play with it. I wlll let you know what I have and take pictures. I guess I do not see a fan clutch it seems fixed blade to me. I will let you know

[Accelo]

Oops, I was looking at one of the pictures others posted. I thought it was copied down.
You have a unique set up. Others have posted pictures of the correct set up.
Your belts do not appear to line up. Difficult to tell from pictures but another indication it has been assembled from parts.
I have all the correct pulleys for your application. If interested PM me.
Cheers

[LNP]

Originally Posted by cjoenny89

I have a 1968 family owned since new. It is a C20 327 v8 3OTT I have have finally got the truck going after many years. It has a terrible fan noise very loud like you thought the tranny was howling. I took of the fan belt and drove it for a quick drive through the gears and it made such a difference I couldn't believe it. Currently it has the factory fixed blade fan. I am wondering if anyone else has ever noticed this on these trucks? Can I run a clutched fan on the truck?
I would like to know what to order as I know that the fan has to sit in the radiator fan shroud correctly so it draws the correct amount of air.
any suggestions on what to try?

His dad must of put the fan spacer between the water pump and the pulley instead of between the pulley and fan. Bet he had a hard time finding a belt for it. lol

[cjoenny89]

I put the pulley back on the water pump and ran it without the fan blades and it is quite as all get out. I bolted the 18" fixed blades back on and the noise is defiantly coming from the fan. Now I need to figure out what fan, clutch and pulley to get.

[LNP]

I thought the water pump made noise when you turned it by hand? I would check the fan for cracks. Do you have a recording of it running? If we heard it maybe that would help more.

[cjoenny89]

I thought the water pump made a squeak when I turned it but I guess not. I ran it with water pump hooked up no fan drove it so quiet then put fan back on and it makes a loud whooshing sound not bad at idle but when it has higher RPMS it get louder. I am convinced it is the fan or at least 90% fan.

[Grumpy old man]

Originally Posted by cjoenny89

question for me is what is the correct parts do I need to fix this problem and ad a fan clutch

Become a subscribing member and post a Want To Buy ad in the parts section , Someone will probably have all the parts you need to get it right , I went aftermarket to have everything line up adding power steering and A/C with a six blade fan and clutch . For the low price of a new water pump replace it while you already have it apart

[72SB]

OP...was your fan on backwards?

[Markuli]

Originally Posted by 72SB

OP...was your fan on backwards?

Looking at the first pic, no, his fan is oriented correctly for a clockwise rotation setup.

[Stocker]

Since you will be changing parts out, consider using studs (instead of bolts) to attach the pulley and fan clutch to the WP. Makes it easier -- I wish I had known about this before I bolted mine back together.

[Accelo]

I believe it you go with a fan the asymmetrical blades it will reduce your noise.
The fan clutch may help some also but the blade design is the critical component.