Topic: AC Idler Bracket

[bmcgc]

65 coupe:   14 Aug build date, 289, alt, cast WP, AC with York compressor (added at a later date Im guessing) non-thermactor

Im adding factory PS.

When I bought the car it had a 2 groove crank pulley and 1 groove WP pulley.  The AC had a 67 clutch.  No fixed idler.

I have installed the correct 3 groove crank and 2 groove WP pulleys and a 65/66 AC clutch.

Alt, WP, crank pulleys line up.

I have not installed the PS pump yet, I bought a bracket and it arrived bent.

The AC clutch and crank pulley line up, the adjustable idler does not.

I dont think I have the correct adjustable idler, I see no way to shim the idler out to meet the AC belt.  The adjustable idler bracket  is also the top alt bracket, so it cant move.

My adjustable idler is C5AA-8A619-B.

I think I need C5ZZ-8678-B.

The fixed idler I bought is C5AA-8A619-D.  Its not installed since it goes over the PS bracket, but it looks like it will line up with the AC belt.

Any help on the correct adjustable idler?

When I used spacers to get the adjustable idler to line up with the AC crank and clutch pulley grooves, it rubbed the alt belt, thats why Im thinking i have the wrong adjustable idler.

[bmcgc]

The C5AA bracket must be the correct bracket.

The bracket can not move away from the engine since the alt also bolts to it.  So moving it with spacers makes a problem with the alt.

What I need is the pulley to move out almost a 1/2in, Im wondering if the bracket has the correct pulley on it.

As the pic shows, its 2.5in from the back of the slotted groove to the face of the pulley.

Can someone with a 65/66 with AC and PS measure that distance for me?

[ChrisV289]

Little hard to measure when it is in the car but hope these help

[rockhouse66]

The C5AA-B is the correct idler.  There are spacers behind two of the idler attachment bolts to the water pump housing.

[BKnapp]

Osborn Electrical Manual indicates that the idler you bought is correct....C5AA-8A16-D, but spacers are required. Page 57 of the Osborn Electrical Manual might be helpful, along with Jim’s Hardware/fastener guide located in the Library.

Obviously the Osborn Assembly manual could have errors, so hopefully others will chime in. I know you are probably getting pretty frustrated as I have been following a few of you our threads...good luck!