I think I have the problem in hand.
Yesterday I spent hours with straight edges and clamps and tried to get the plane of both the mounting bracket with the two holes and the plane of the bolt hole for the pulley exactly parallel.
It took two or three tries on and then off the car but that last attempt seems to have stopped 99% of the squeal.
I will see if Jim Carpenter gets back to me and if he does in fact have an NOS bracket, I will buy it. I may even take a small box and pour some Plaster of Paris or Silicone and make a negative of this bracket so in the future I have a
way to make sure the part is not bent!
I will get the car out on the highway this week for a long drive and that will let me know if this issue is put to bed.
James
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
On Behalf Of John Grady
Sent: Saturday, April 8, 2023 16:00
To: John Nowosacki <jsnowosacki@xxxxxxxxx>
Cc: James Douglas <jdd@xxxxxxxxxx>; Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Frustrating Squeal...
While on this , I once built up a J with a cam ( and in an unfortunate move) a shift kit in the 727 .
J already shifts pretty high at WOT guess 5500 -6000 . With shift kit , really hard shifts but also maybe 400 more rpm .
So what happened a few times is the belts turned over in the grooves )had seen that before on a friends 4 spd 60 vette . But twice it tossed the long belts which wrapped around the fan and destroyed the radiator . ( but 1-2 shift was
unreal , J stepped sideways ) .George R type thing (?)
At the time the max wedge did this too , throw belts as well as shearing off the tip of the oil pump drive , turning your max wedge into a boat anchor in a second . Lesson : forget high pressure or high volume pumps .
Later a much better heat treated oil pump drive came . But stock pump was fine .
The cure at the time for belt hassles were “ deep groove “ pulleys for B Block . A lot of $ and a lot of work and maybe no ac pulley version .
Also IRR special “ race” belts from Dayton with black and white segments on the backing .
I am not sure if segmented belts help cause or cure this issue . I think segmented bend easier , steal less hp but the reduced cross section of cord at thin places says more stretch to me and break easier .
A wedge is not a sbc or a hemi , they are done below 6 k imho , so thinking of that feeds back to keep moderate belt speed .
john g
The 440 belt system for A/C on my Hurst started to give me problems a few years ago. There were no strange noises, but under high revs (while hammering the loud pedal out on the highway), there was a tendency
for the small belt that goes around the idler/tensioner for the water pump to get tossed, which is obviously not good for engine cooling at such high revs on warm days. The 'fix' came from swapping out the original bracket with an old one I had in my parts
stash. The original bracket had developed a slight tweak and was no longer keeping the belt in proper alignment with the water pump and crank pulley. I believe the bearing/pully itself is still available at auto parts stores, but not the bracket itself.
Might be a good idea to scavenge a couple from A/C cars in junkyards if you can still find some.
Also, I used to have a few Jensen Interceptor cars back in the day, which were equipped with 440 engines and A/C. There was an interesting bracket as part of that system that held a 'wheel/idler' that rode
on top of the A/C belts between the compressor and alternator that stopped the flopping of the belts. It was not a tensioner, as the belt tension was still controlled by alternator position, but was just an added item to reduce the flopping of the belts when
the compressor was engaged. Maybe it was something Chrysler added to the engine around 73/74, or maybe it was something Jensen did? Never saw the bracket on any Chrysler from 1970 or earlier, but it was present on both my 73 and 74 Jensens.
I have been trying to ruin down that belt or pulley noise for weeks. I do not want something to fail and go through my new radiator.
At first I thought it was the AC clutch bearing. New bearing. Then perhaps the idle pulley bearing. I got an NOS one and it sounds worse!
I studied the pulley bracket very intently and it is perhaps a hair bent. So I pulled it off again and ran a straight edge on the bracket and the pulley face it appears a little
out. So I give it a whack and put it back on and the noise goes down a lot.
As I am revving it HARD I also notice that the alternator-AC belts look like they want to “climb” a little on a hard rev. That bracket is forged so I do not know how that can be
adjusted if it is out a little.
In the AM I am going to pull the idle pulley out one more time and give it a little more in the same direction and see what I get.
I wonder if these new cog style belts bite better and if things are even a little bit out of alignment can cause the belts to squeal under a load more than the old smooth belts?
I did spray them with belt dressing.
What a PITA.
James
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