[ctsplicer]

Hey there.Now I'm looking for a 3 groove crank pulley for my 66 Bonneville 389 A/C equipped car.Any out there?

[tri.lllgto]

A/C pulley was a seperate pulley mounted behind the 2-grove pulley.The A/C 2-grove was also a different diameter than the non A/C version.

[Scott Thelander]

I can help... I also have the rare often lost big rubber ring that goes between the pulleys...

Ille pull em tomorrow eve and shoot a couple pics...

Scott scott68gto@comcast.net ....

[ctsplicer]

great ,thanks.

[Scott Thelander]

Here are the pics of the pulleys...

scott

[Scott Thelander]

here are the pulley pics...they will clean up well....
how is your balancer theysometimes crack thru to the seal side at the keyway... beware..

there is no sign of loose bolts on the pulleys and they are very straight...
thanks ...........scott

[ctsplicer]

I don't know about the condition of the balancer as it is still on the engine,and still in the car.How much for the pulleys?

[ctsplicer]

my crank pulley has p/n 978804 stamped on it.Different from the one you posted.Why is that?

[Scott Thelander]

Fairly sure that is the 66 67 non air power steering pulley... 1/2 inch or so smaller diameter than the a/c pulley... 9778804... with 2 7's.....is the number I think you meant

scott

[67Dan]

Originally Posted by Scott Thelander

Fairly sure that is the 66 67 non air power steering pulley... 1/2 inch or so smaller diameter than the a/c pulley... 9778804... with 2 7's.....is the number I think you meant

scott

I noticed online there are two different pulley numbers for the power steering pulley for AC VS non AC cars! You say there is a diameter difference, why?? Seems odd to me what they woudl do that at all!

I'm having issues with alignment and I'm hoping the mismatch water pump pulley will solve the problem, but now I find out about this and wonder?

Dan Mascheck

[Scott Thelander]

You should have mentioned the alignment problem first off...
I dont know what u need now,,,,,,,,

good luck

we thought u needed a lower pulley.. they all have the same depth just diff diameter..

so find the number on the waterpump pulley and post it.......

if thats where the problem lies........ probably got a chevy one or 68 up one...

[67Dan]

Originally Posted by Scott Thelander

You should have mentioned the alignment problem first off...
I dont know what u need now,,,,,,,,

good luck

we thought u needed a lower pulley.. they all have the same depth just diff diameter..

so find the number on the waterpump pulley and post it.......

if thats where the problem lies........ probably got a chevy one or 68 up one...

The bottom pulley my AC guy says is a 4 bolt correct one!

I think my issue on alignment is the water pump pulley and I have a correct one coming!

The question still is why do you need to different size pulleys for the power steering pump, AC VS non AC. Seems they should or could be the same.

[Scott Thelander]

Sounds like you have a 68 and newer balancer or an aftermarket one....

again pictures are worth a 1000 words........and probably a later timing cover also..

or a ground off timing mark on the old 66 cover...4 bolt balancer has larger dia. than 66's

I am on the side/standby on this situation... until you tell us the depth and diameter, of

your water pump pulley and its part number and what direction you need the belt to go.

and how far...pictures pictrures pictures...........u might have the wrong waterpump also


strliteblkjudge on the side -.-.

[67Dan]

Originally Posted by Scott Thelander

Sounds like you have a 68 and newer balancer or an aftermarket one....

again pictures are worth a 1000 words........and probably a later timing cover also..

or a ground off timing mark on the old 66 cover...4 bolt balancer has larger dia. than 66's

I am on the side/standby on this situation... until you tell us the depth and diameter, of

your water pump pulley and its part number and what direction you need the belt to go.

and how far...pictures pictrures pictures...........u might have the wrong waterpump also


strliteblkjudge on the side -.-.

I was told Pontiac at the end of the run in 67 changed to the 4 bolt system from the 6 bolt. I’m sure they were getting ready for the 68 and later that were getting ready to roll out of the factories!

Still that is not my question. Why the different size power steering pulleys for AC cars and non AC cars!

[Scott Thelander]

I thought the question was does any body have an a/c pulley for my

66 ,1966 ,sixtysix ,three 8tee nine, 389??? sorry I got lost....somewhere.. & I thought

67's were 400's though..mine was..hmm.......so your motor is a 67?? WOW I am lost..

this is burnin alot of braincells.........ok.......fill us in again........

as for size the second question....... I think the ac pulley size increased for efficiancy

of the cooling system... larger pulleys turn the belt further .....spinning the waterpump

faster... my garage has all manual trans non a/c cars... uh 1 68 yz a/c partscar outside

sorry thats all I am good for....... goin back out to the garage... good luck

..............scooter T.....

[ctsplicer]

Scott,unfortunately someone hijacked my thread and mixed you up.Check the names on the post.I am the originator of this thread and need an A/C pulley for the crank on a 66 Bonneville with crank pulley on the car that reads 9778804.

[ctsplicer]

Thanks for all the help.A buddy of mine just dropped off all the pulleys and the rubber seal.He had them sitting in his barn for the last 30 plus years.

[Scott Thelander]

ctsplicer I will pm you

[ctsplicer]

Confusing,ain't it?