[Hikin Mike]

Just replaced my radiator with a Cold Case and temps are great. Next project. For a very long time, when I get on it I hear my fan belt screaming. Took a good look and it looks like my alternator pulley is misaligned. The alternator itself seems to be correct, just the pulley is off.

Do they sell different alternator pulleys?

[Scott Thelander]

looks more like your power steering pump is crooked .??
the upper alternator adjustment bracket is on the wrong waterpump bolt and no rear support to intake..
we need to know your pulley part numbers stamped into them
and a picture shot of the rea of the pump and alternator....
looks like you dont have the washer over the stud at the adjuster,,, to push drivers side forward and straighten the pulley

[Hikin Mike]

Originally Posted by Scott Thelander

looks more like your power steering pump is crooked .??
the upper alternator adjustment bracket is on the wrong waterpump bolt and no rear support to intake..
we need to know your pulley part numbers stamped into them
and a picture shot of the rea of the pump and alternator....
looks like you dont have the washer over the stud at the adjuster,,, to push drivers side forward and straighten the pulley

I put a strait edge on the water pump pulley and power steering pulley. They are fun. The issue is the alternator.

I know for a fact the alternator is not original. I can see if I can read it without removing it.

I'll take a pic shortly...

[Hikin Mike]

Best I can tell/read, the alternator p/n is 1102479 55A.

The washer is there in the power steering pump.

[lust4speed]

From what I can see in the photos it looks that the water pump pulley is slightly to the rear of both power steering and alternator pulleys. How does the crank pulley align with the water pump pulley? If it is also slightly forward, I'd be inclined to fix the problem by installing a spacer between water pump hub and pulley.

[68 Firebird]

yeson mine i have a small shim spacer behing waterpump pulley. that brings all 4 into perfect alignment. Gerry

[Gary H]

Looks like wrong water pump pulley to me. If you eye the balancer pulley compared to the water pump pulley it appears that the water pump pulley grooves are too far back. Get the number off the water pump pulley and let's see what it is.

[David Jones]

I suspect the problem lies either with the water pump (long/short) or the wrong water pump pulley. Neither the alternator belt or the power steering pump belt looks correct via the pictures. The PS belt leaves the water pump pulley tight to the front of the pulley and arrives at the pump tight to the rear of it's pulley. Are the pump and pulley vintage 1969 possibly? Tough year due to a water pump change.

[Hikin Mike]

I have a few things to do today and I'll try and get a part number from the water pump pulley today.

The car is a 1970 455 from a Bonneville. I'm pretty sure most of the parts are from the same engine. When I bought it 35 years ago the original motor was gone and there was no motor in it, in fact it used to have a SBC due to the mounts.

[tooski]

I had the same misalignment problem when installing the CVF kit. I was ready to install a spacer on the pump flange, then did research on the pumps. Turns out I had the early/short pump. Picked up the late/long pump and everything lined up perfectly. If you order a pump for a '69 you may get either the early or long pump. Ordering a '70+ pump gets you the long. Research shows the difference is 1/2", but measuring both pumps showed it to be less than that.

[Hikin Mike]

Well, well, well. Looking into it again, I put a metal straight edge on the crank pulley and ps pulley and then the wp pulley. They are not flush. Thankfully I was able to read the water pump pulley without any problem. Looks like p/n 481040XT. Looks like I need a 1/4" spacer.

[Scott Thelander]

so you have a 71 up water pump pulley on a 67-70 ps pump pulley
they dont like each other by 1/4" ish

sounds like you may need a 69-70 9799128 ac water pump pulley to start with

whats your ps pulley 9786901 ?

[Hikin Mike]

Originally Posted by Scott Thelander

so you have a 71 up water pump pulley on a 67-70 ps pump pulley
they dont like each other by 1/4" ish

sounds like you may need a 69-70 9799128 ac water pump pulley to start with

whats your ps pulley 9786901 ?

Water Pump - 9796351
Power Steering Pulley - 9786901 XU

[Scott Thelander]

well now
you have a 4" GM pump .... not a 4.5 ... ok .... = distance from gasket to the front of fan hub
then
you need a 9796061 68 69 ac pulley fairly sure or there is another also 68 9788886 ? if I was by my books/notes... its smaller diameter than
the 6061 .. I have a couple spares of those
or its time for a new 4.5 quality pump and the 9799128 pulley

IF
the crank pulley is a 9790842 and 9790843 68 69 70 .... and not a 48 _____ 71 n up number

no 48 _ _ _ _ _ number water pump or crank pulley will line up correctly without issues to your power steering set up .

from my screwin around I have done ... and read about

others please chime in also

"OLE pinion" where art thou !!!

Scott

[Hikin Mike]

Originally Posted by Scott Thelander

...
IF
the crank pulley is a 9790842 and 9790843 68 69 70 .... and not a 48 _____ 71 n up number

Not sure I can get to seeing the crank pulley. Since it's 200 degrees outside right now, I'll look into it either this evening or first thing in the morning.

[Scott Thelander]

you are correct you cant see it it needs to come off its under the reinforcement plate or ring...

IF

the crank and power steering line up exactly with your straight edge
chances are good that is the correct one ... its only 4 bolts to pull it off ... just to know

tuck a couple pieces of cardboard against the engine side of the radiator while your wrenchin ... just incase of
a slip ........ when pullin the fan

[Hikin Mike]

Originally Posted by Scott Thelander

you are correct you cant see it it needs to come off its under the reinforcement plate or ring...

IF

the crank and power steering line up exactly with your straight edge
chances are good that is the correct one ... its only 4 bolts to pull it off ... just to know

tuck a couple pieces of cardboard against the engine side of the radiator while your wrenchin ... just incase of
a slip ........ when pullin the fan

While I was measuring with the straight edge, the crank and ps pulleys are NOT flush. Maybe 1/8-ish difference.

I JUST replaced the radiator with a new Cold Case on Sunday...lol!

[Hikin Mike]

Crank Pulley - 9790842 YB

[Schurkey]

Thousands of years ago, my crew had to align pulleys/sheaves on City Buses. The A/C compressor would slide back and forth to get the alignment correct.

We learned right away that you need to hold the straightedge from the top of the crank sheave to the top of the A/C compressor pulley, from the bottom of the crank pulley to the bottom of the A/C compressor pulley, THEN run the straightedge from the A/C compressor back to the crank. Going both ways is the only way to determine fore/aft problems vs. twist or tilt; or a combination. Usually, it was a combination of twist, tilt, and fore/aft. It's a three-dimensional world, there's a heap of ways for pulleys to NOT be aligned.

[Hikin Mike]

Looks like I'm going to use shims. Finding the correct water pump pulley is probably not going to happen.

Question, is Pontiac different then Chevy wp pulleys? Most wp spacers show GM and Ford, so I assume they will fit.

Thanks again.