farmer52 Posted June 4, 2015 Share Posted June 4, 2015 The A/C belt on my MH is squealing when I accelerate. I am going to install a new belt since I do not know how old is this one. I did a quick look last week and could not determine how to tighten the compressor. Does anyone have the service procedure or know how to loosen and put tension on the compressor/belt? What is the tension spec? Thanks in advance for the info. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/ Share on other sites More sharing options...
David Posted June 5, 2015 Share Posted June 5, 2015 Ken, If your E7 is like my E6's, the compressor sits on a table. loosen the bolts that come up through the table into the compressor. There may be bolts that move the compressor to tighten the belt then re tighten the mount bolts. Check the table for cracks. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-292358 Share on other sites More sharing options...
farmer52 Posted June 14, 2015 Author Share Posted June 14, 2015 Got into a can of worms today. I was able to determine how to adjust the tension on the A/C belt (4 bolts holding the compressor and 2 jack bolts). Anyway, after tightening the belt (was not that loose), I still had a squeal at high rpm so I was able to stand in front of the grille and listen as it continued to squeal. The noise was coming more from the driver's side (alternator side). So I checked the belts and they seemed loose. I was able to get the alternator belts tightened but now the squeal was constant and louder when I turned on the A/C. Next I loosened the belts slightly and still squealing constantly. Now I am thinking alternator bearing. When the A/C is energized, it puts a load on the alternator (is my thinking correct?). I removed the alternator but no side motion in the shaft. Anyway I am a going to have it rebuilt. I hope this will eliminate the squeal.Any thoughts? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293248 Share on other sites More sharing options...
alex g Posted June 14, 2015 Share Posted June 14, 2015 I had to replace some drive pulleys on my engine they would not let the belts stay tight check to see where your belts sit on the pulleys they should be slightly above the top 1 Quote Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293249 Share on other sites More sharing options...
41chevy Posted June 14, 2015 Share Posted June 14, 2015 Belt could also be "glazed" from slipping on top of anything else. I'd personally put new belts on just for G.P. Paul 1 Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293259 Share on other sites More sharing options...
farmer52 Posted June 14, 2015 Author Share Posted June 14, 2015 Belts look okay but I will likely put new belts on while it is down.BTW, the belts were cool to touch. I figure if they were slipping, they would be warm. However the pulley on the alternator was very warm. Which leads me to believe the bearing is bad. 1 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293286 Share on other sites More sharing options...
220cummins Posted June 14, 2015 Share Posted June 14, 2015 I know in the past, if the belts looked ok ie not fraying, chaffing, cracks, or dry rot, I've put a little dielectric grease on belts that squeal and that usually corrects it. It's worth a shot if you plan on getting new belts anyway. Quote Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293290 Share on other sites More sharing options...
farmer52 Posted June 14, 2015 Author Share Posted June 14, 2015 Thanks everyone for the comments. I removed the alternator on Saturday and will be going to the rebuilder on Monday. Hopefully I will have it back on Tuesday. It is getting "crunch time" for Macungie. I know, I should have checked it when I returned from York. Hind sight is 20/20 as they say. Just been busy with the house in OH and farm property in PA. Seems there is less time to do stuff since I retired. 1 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293298 Share on other sites More sharing options...
farmer52 Posted June 15, 2015 Author Share Posted June 15, 2015 Update on the alternator issue. I checked on reman alternators and the cost is only a "few" dollars less than a new Delco which has a (1) year warranty versus a 30 or 90 days on reman. My alternator is a 22SI 145A and Watt has a 24SI 160A. The 24SI has dual internal cooling fans, otherwise they are the same (J mount, etc.). Unless someone states otherwise, 24SI it is. I can eventually have my old 22SI rebuilt and keep as a spare. The saga continues......New alternator and belts and hopefully the squealing will be eliminated. If not, perhaps there is a mouse or two caught somewhere. 1 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293444 Share on other sites More sharing options...
Quickfarms Posted June 15, 2015 Share Posted June 15, 2015 What belts are you using?I had a similar issue on my ford with the gates alligator belts. Changed the belt to a factory one and the squeal went away. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293450 Share on other sites More sharing options...
farmer52 Posted June 15, 2015 Author Share Posted June 15, 2015 QF - The MH currently has Mack branded belts and that is what I plan to install. Thanks! Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293464 Share on other sites More sharing options...
farmer52 Posted June 17, 2015 Author Share Posted June 17, 2015 SUCCESS!! This morning I purchased a new Remy 24SI from Watt and installed it this afternoon. I also installed a new A/C belt but not alternator belts. The new belts were not long enough (although correct belts per parts book P642). So I reintalled the old belts (P652). I crossed my fingers and eyes and started the MH. Then with baited breath I turned on the A/C and NO SQUEALING!!! Did some snap accelerations and WONDEROUS!!Only issure, I could not get the A/C compressor jack bolts installed so I used a pry bar and "snugged" the belt and tightened the anchor bolts. The new belt may stretch after some running.FYI, the 24SI has dual internal cooling fans versus one external fan on the 22SI.So if the Lord is willing and the creeks don't rise, I will be on my way to Mudcungie Thursday morning.Right now I am happier than a pig in shit mud.P.S. Barry - kudos to Terry for recommending the 24SI (and it was cheaper than a 22SI which was not in stock). Also, shop installed the pulley! 1 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293647 Share on other sites More sharing options...
Popular Post j hancock Posted June 18, 2015 Popular Post Share Posted June 18, 2015 Sounds like a good upgrade for the MH alternator.I called over to the Kilt and told Red that Ken was on his way and he his truck wouldn't be squealing this year. 3 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/40343-mh-ac-belt/#findComment-293776 Share on other sites More sharing options...
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