Your donations help keep this valuable resource free and growing. Thank you.
|
Belt and AC Questions |
Post Reply | Page 12> |
Author | |
apannizzo
AMC Nut Joined: Jun/08/2015 Location: NY Status: Offline Points: 335 |
Post Options
Thanks(0)
Posted: Jul/11/2018 at 1:59pm |
I have a 74 AMX with a 360. The belt that goes around AC compressor and Power steering pump is a little too Big and gives a slight Squeaking noise when accelerated. Does anybody know the correct part or part number for correct belt needed. The belt is relatively new and no more adjusting can be done to pick up slack. Also, when I put AC on Desert mode, there is a squealing coming from AC Compressor by where Pulley on AC Compressor is. On regular AC there is no Squealing. Could this also be related to Belt? Lastly, is there a Low Pressure Switch on this system? If so, where would I find it? Any and all Feedback would be Appreciated.
Thanks Al |
|
Allan Pannizzo
|
|
304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
Post Options
Thanks(0)
|
Hi, just checking... you do have the idler pulley installed, right? It should be located between the timing cover and alternator, and tensions the belt properly for AC cars.
Billd did answer your question in your previous post about the low pressure switch not being part of AMC AC systems back in the day. He did state you could have one installed at the sight line fitting, as a method to cut off the feed to the compressor clutch, when low pressure condition is happening. It is not stock, but it will do as an option. |
|
71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
|
apannizzo
AMC Nut Joined: Jun/08/2015 Location: NY Status: Offline Points: 335 |
Post Options
Thanks(0)
|
Dude,
Yeah for some reason on my end I could not find the First Post I started. It Disappeared! Anyway, OK, there is a Tensioner there. Was looking to try a Different Belt but wanted to get some Feedback. What about Squealing at Desert Mode? Any Advice? |
|
Allan Pannizzo
|
|
304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
Post Options
Thanks(0)
|
Well, having had both a 73 and a 71, 304 engine with AC, the squealing can be by pressure build up from extra cooling. Usually if your belt is a wee small, taking it to a good parts store can measure or compare with a new replacement. 74 is no different than 73, unless your pulley is not factory or a late production from early 75. I think the 75 had a non serviceable pulley, and may be slightly bigger. You may have the parts counter person pull a 75 belt and a 73 belt to compare with. I needed a smaller belt for my van, back in 2003, and that's how we got the right fit. |
|
71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
|
6768rogues
AMC Addicted Joined: Jul/03/2007 Location: United States Status: Offline Points: 6234 |
Post Options
Thanks(0)
|
My 68 290 had an Eaton PS pump and no idler. I think that was added later. I would take off the belt, go to Carquest or other local store, and tell them you want one a little shorter. Our Carquest will measure it and give options for other lengths.
|
|
Content intended for mature audiences. If you experience nausea or diarrhea, stop reading and seek medical attention.
Located usually near Rochester, NY and sometimes central FL. |
|
Buzzman72
AMC Addicted Joined: Sep/15/2009 Location: Southern IN Status: Offline Points: 2713 |
Post Options
Thanks(0)
|
Another pertinent question might be...is it factory A/C, or is it American Air? American Air was the dealer installed A/C kit, and might use a different belt.
|
|
Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
|
|
akimmet
AMC Nut Joined: Aug/02/2012 Location: Republic OH Status: Offline Points: 428 |
Post Options
Thanks(0)
|
What is the number on the belt currently installed?
Some belts have easy to decipher part numbers, so it could be easy to come up with a part number that is an inch shorter. Knowing how the numbers work ahead of time is far easier than dealing with a clueless parts store clerk. As an example: Dayco 15440 = 15/32" wide 44.0" inches long. With Dayco numbers, the first two numbers denote width in 32nds of an inch, With 15, 17, and 19 as standard automotive belt widths. The last three numbers denote the length in inches. The decimal point is omitted before the final digit. |
|
304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
Post Options
Thanks(0)
|
That is what I was thinking, but was not sure how the codes worked until you explained it. What I mentioned by smaller, is less belt width. Could fit by length, but may not hold as well, if the factory requires a wider belt. A thinner belt 15mm can make the same length belt as one that is 19mm, fit looser, as the V will seat deeper in the groove, thus making your pulleys seem smaller. One way to fix an odd fit is to get a wider belt, as long as the belt fits flush, not protruding out from the pulleys. |
|
71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
|
PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5904 |
Post Options
Thanks(0)
|
Original Post got moved to the HVAC sub-forum section at the top of the Body & Interior Section
( the HVAC sub forum is real easy to miss isolated up at the top of the Body & Interior Section ) A/C Compressor Fan Belt, using the 1967-72 Parts Manual and RockAuto: With the '72 & Up Lobe Shaped Saginaw P/S Pump: AMC # 321 5365 = GATES Belt 9640 High Capacity V-Belt; HC50 15/32 x 64-3/8 With the '72 & Earlier Round Eaton P/S Pump: AMC # 321 2069 = GATES Belt 9620 High Capacity V-Belt; HC50 15/32 x 62-3/8 |
|
apannizzo
AMC Nut Joined: Jun/08/2015 Location: NY Status: Offline Points: 335 |
Post Options
Thanks(0)
|
OK Got the Belt you recommended. Was able to make it nice and snug. Turned AC on and all squealing gone even in Desert mode and everything is Beautiful!!! Thanks for Everybody’s Help!
|
|
Allan Pannizzo
|
|
Post Reply | Page 12> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |