74 big block idler pulley with factory air.

[Charlied]

Want to replace idler pulley. Car has two belts. Original pulley about 1.5 inches wide, diameter 4 inches.Ordered “correct “ pulley from Rock Auto diameter right, width 1 inch, would work with single belt. Napa part same.
Any idea who might sell correct one ? Think part # is 3830 162, if I read my part book correctly.
Thanks

 

[pnora]

Want to replace idler pulley. Car has two belts. Original pulley about 1.5 inches wide, diameter 4 inches.Ordered “correct “ pulley from Rock Auto diameter right, width 1 inch, would work with single belt. Napa part same.
Any idea who might sell correct one ? Think part # is 3830 162, if I read my part book correctly.
Thanks

If its the water pump belt tensioner pulley you are talking about it is a single groove.

 

[Charlied]

If its the water pump belt tensioner pulley you are talking about it is a single groove.

Sorry, I wasn’t clear. The pulley keeps tension (downward)on the twin belts that run from the crank up to the A/C compressor, to the alternator and has no grooves. I think the idea was since it is a long run from A/C compressor to alternator to cut down on vibration and belt hop.
My concern is with the pulley slightly narrower,could a belt slide off. Maybe making a mountain out of a molehill here.
What do you think ?
Thanks for listening.

 

[pnora]

This would be your pulley. 1 inch wide is plenty for two belts. 1974 DODGE CORONET 6.6L 400cid V8 Idler Pulley | Shop Now at RockAuto

 

[Charlied]

This would be your pulley. 1 inch wide is plenty for two belts. 1974 DODGE CORONET 6.6L 400cid V8 Idler Pulley | Shop Now at RockAuto

Well, I bought that pulley from Rock Auto, doesn’t work, returned it. Checked around, NAPA, ADVANCE, the pulley they offer identical. What’s crazy all say correct for factory air, which is what I have, I don’t get it.
Maybe since I have dual pulley alternator has something to do with it.
If I get ambitious tomorrow will take a picture and send it you

 

[T2R9]

Can the bearing be pressed out and replaced? Just thinking out loud, 73 and up stuff gets weird. Kinda why I am using 72 and down pulleys on my 74.

 

[khryslerkid]

If it's just a bad bearing a lot of the time you can replace just that.

 

[pnora]

Well, I bought that pulley from Rock Auto, doesn’t work, returned it. Checked around, NAPA, ADVANCE, the pulley they offer identical. What’s crazy all say correct for factory air, which is what I have, I don’t get it.
Maybe since I have dual pulley alternator has something to do with it.
If I get ambitious tomorrow will take a picture and send it you

All factory a/c in that vintage had a dual groove alternator. Post some pictures.

 

[Charlied]

All factory a/c in that vintage had a dual groove alternator. Post some pictures.

OK,here are pics. BTW confident P/N is 3830162,haven’t found one.

 

[Charlied]

Can the bearing be pressed out and replaced? Just thinking out loud, 73 and up stuff gets weird. Kinda why I am using 72 and down pulleys on my 74.

Good thought, have to investigate, have to find some one to do it, way above skill level.attached some pics, believe P/N 3830162 . Thanks

 

[Charlied]

If it's just a bad bearing a lot of the time you can replace just that.

Good idea, have to search for some one who could it, don’t have a drill press and above skill level. Attached some pics of pulley, it’s really a tensioner.