Fan clutch question July 22, 2007, 02:31:31 AM being i have a 91 motor, the fan clutch is held to the pump bu a really big freakin nut..... and it won't budge.... how do i kep the water pump shaft from turning so i can loosen the big ass nut? i'm thinking it's reverse thread, but i can't get enough torque either way to make it move before the shaft starts turning....also, i was thinking about changing the pump to an 87-88 pump because that uses a bolt on clutch and i can just replace it all..... so my question there is i know they have the same mount and shape, but the 87-88 pump sits about 1/4 inch higher at the bolt mounts.... do you think that will work? Quote Selected
Fan clutch question Reply #1 – July 22, 2007, 08:26:09 AM The clutch is held by a big nut but the fan is held by the normal bolts you are use to seeing.the fan bolts here are the key.now,,,,,,,since you cant see behind the pump plully, ill asure you that there is a usefull tool built into the pump itself. there is a hole machned into the pump that i believe is on the left side of the pump.,, you could hunt it down with a mirror but it needs to be located.actually , iirc,, i think there are two holes in the pump so double your fun with two punches or bolts.1-remove a single fan to clutch bolt.2-pass a bolt, punch , long metal object through clutch/fan assy.3-locate your hole in the water pump4-rotate fan until punch is in water pump hole.(not a wheap hole)5-now your locking your clutch to the water pump.6-now your ready to loosen the clutch nut.the water pump shaft is machined like a nipple fitting. The nut you see is a part of the clutch.Your engine is likely a CCW rotation (viewing the flywheel as its suppose to be)its likely you will have to "righty loosey" "lefty tighty" the nut.In other words its reverse threaded most likely on a ford motor.to keep it simple,, viewing the motor, you will turn the nut CW to loosen and CCW to tighten. There will likely be locktite as well. Juste put a big ass pipe wrench with pipe or large cresent with pipe to break it loose.To install,,,,,,,,,,,,,*********JUST SPIN IT ON****** you dont need to tighten.when the engine starts repeatedly over time,, it just keeps on getting tighter because of the direction it torques when cranking.again,, the key to locking it up is to find the hole in the water pump , line up that hole with your bolt you removed from the fan,, pass an object into the clutch assy and into the pump thus locking it in place.good luck.,, they are not fun if you have'nt done it before. Just study your engine rotation for a moment and re-read what i said above , it will make sense. the last thing you want to be doing is loosening in the wrong direction when you finally figured out you were tightening.If you already have a new part either pump or clutch,,, look at the thread path / pattern and you'll be able to tell which direction you need to spin to loosen.Usually, all you have to do is leave the belt on and loosen it by striking the cresent or pipe wrench with a hammer.[COLOR="Red"]************i might be a little wacked out on which bolt to remove,,, If its not the fan bolt,, then its going to be an actual waterpump pully bolt. Either way,, a small bolt needs removed so you can line up your bolt hole to the one machined into the pump.********[/COLOR] Quote Selected
Fan clutch question Reply #2 – July 22, 2007, 09:20:17 AM This is a good time to install a 3G alternator and an electric fan. Quote Selected
Fan clutch question Reply #3 – July 22, 2007, 11:03:35 AM I'm not absolutely sure on the Bird pumps like you have, but the front cover is different on the later stuff...Quote from: jcassity;162547 Just study your engine rotation for a moment and re-read what i said above , it will make sense. the last thing you want to be doing is loosening in the wrong direction when you finally figured out you were tightening.If you already have a new part either pump or clutch,,, look at the thread path / pattern and you'll be able to tell which direction you need to spin to loosen.Usually, all you have to do is leave the belt on and loosen it by striking the cresent or pipe wrench with a hammer.[COLOR="Red"]************i might be a little wacked out on which bolt to remove,,, If its not the fan bolt,, then its going to be an actual waterpump pully bolt. Either way,, a small bolt needs removed so you can line up your bolt hole to the one machined into the pump.********[/COLOR]IF the pump runs on the inside of the belt it's a CW rotation, on the outside CCW... The inside of the belt is ALWAYS to the crank pulley.. Quote Selected
Fan clutch question Reply #4 – July 22, 2007, 11:12:39 AM use a strap wrench on the pulley, and your timing cover is for the "short" water pump style. meaning a earlier covers will cause a belt misalignment. Quote Selected
Fan clutch question Reply #5 – July 22, 2007, 09:36:13 PM thanks for the help..... when i went to advance, the tool they had sucked (it was a c-shaped wrench that was supposed to hold the pulley bolts... yeah, right)... so i went to o'reilly's and they had a kd tool that actually grabbed the pulley bolts.... that did the trick... that and a bottle of liquid wrench :)..... so anyway, if anyone ever is doing one, it is a regular thread nut (counter-clockwise to loosen) and the o'reilly loaner tool worked great.... thanks againas for the electric fan and 3g alternator, they might come when we finally restore this thing... i have to stop driving it everywhere first :) (i have a 95 amp factory alternator already... is that the 3g?) Quote Selected
Fan clutch question Reply #6 – July 23, 2007, 09:04:15 AM i always use a long air chisel. just a little hit and its loose. if you're careful you wont scar the nut. Quote Selected
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