JacobVS Posted Saturday at 12:22 AM Share Posted Saturday at 12:22 AM So I am now having issues with my mj, it’s a 89 2.5l and has been running pretty good up until today. I drove her today to pick up some stuff started great and ran great. When I went to head home she would not start. I found out my oil was very low refilled it and now something isn’t working. The engine starts and runs but the belt does not spin. I am not sure what the issue is and am looking for some help. Link to comment Share on other sites More sharing options...
eaglescout526 Posted Saturday at 12:29 AM Share Posted Saturday at 12:29 AM Like belt isn’t spinning at all? Sounds like it’s slipped off the harmonic balancer. Link to comment Share on other sites More sharing options...
Eagle Posted Saturday at 12:33 AM Share Posted Saturday at 12:33 AM Is the belt tight? If so, there should be some rather loud noise and a smell of burning rubber. Basically, there's a good chance one of the pulleys the belt runs over has a seized bearing: Water pump, alternator, a/c compressor (or idler), power steering pump. Link to comment Share on other sites More sharing options...
89 MJ Posted Saturday at 12:46 AM Share Posted Saturday at 12:46 AM If the belt is on and tight, the water pump and alternator being seized would be my first two suspects. Link to comment Share on other sites More sharing options...
eaglescout526 Posted Saturday at 01:15 AM Share Posted Saturday at 01:15 AM 41 minutes ago, Eagle said: (or idler) 2.5L didnt get one with an AC delete. Unless the OP has something like my 84 where its an aftermarket set up with an idler. Link to comment Share on other sites More sharing options...
JacobVS Posted Saturday at 02:01 AM Author Share Posted Saturday at 02:01 AM 1 hour ago, eaglescout526 said: Like belt isn’t spinning at all? Sounds like it’s slipped off the harmonic balancer. It’ll spin a bit but I didn’t want to run it long without it working Link to comment Share on other sites More sharing options...
JacobVS Posted Saturday at 02:02 AM Author Share Posted Saturday at 02:02 AM 1 hour ago, Eagle said: Is the belt tight? If so, there should be some rather loud noise and a smell of burning rubber. Basically, there's a good chance one of the pulleys the belt runs over has a seized bearing: Water pump, alternator, a/c compressor (or idler), power steering pump. Sure seems tight, how much play should it have when it’s tight? Link to comment Share on other sites More sharing options...
JacobVS Posted Saturday at 02:03 AM Author Share Posted Saturday at 02:03 AM 1 hour ago, 89 MJ said: If the belt is on and tight, the water pump and alternator being seized would be my first two suspects. That’s my thoughts too Link to comment Share on other sites More sharing options...
JacobVS Posted Saturday at 02:04 AM Author Share Posted Saturday at 02:04 AM 48 minutes ago, eaglescout526 said: 2.5L didnt get one with an AC delete. Unless the OP has something like my 84 where its an aftermarket set up with an idler. All stock on this one Link to comment Share on other sites More sharing options...
89 MJ Posted Saturday at 02:09 AM Share Posted Saturday at 02:09 AM The belt should have less than an inch of movement if it’s tensioned properly. I’d pull the belt off and figure out what isn’t spinning and replace it. Link to comment Share on other sites More sharing options...
JacobVS Posted Saturday at 05:09 AM Author Share Posted Saturday at 05:09 AM 2 hours ago, 89 MJ said: The belt should have less than an inch of movement if it’s tensioned properly. I’d pull the belt off and figure out what isn’t spinning and replace it. Thanks for the Advice I hope to get started on it tomorrow. Link to comment Share on other sites More sharing options...
pizzaman09 Posted Saturday at 05:40 PM Share Posted Saturday at 05:40 PM What is the condition of the harmonic balancer rubber? Could the center be spinning inside the outer ring? Link to comment Share on other sites More sharing options...
watchamakalit Posted Saturday at 05:57 PM Share Posted Saturday at 05:57 PM 17 minutes ago, pizzaman09 said: What is the condition of the harmonic balancer rubber? Could the center be spinning inside the outer ring? I would think Something would have to put allot of tension on the belt for that to happen. Seems the balancer would throw the belt or come apart before that occurred. Edit: I would pull the belt and check all the pulleys to see what turns. Link to comment Share on other sites More sharing options...
eaglescout526 Posted Saturday at 06:05 PM Share Posted Saturday at 06:05 PM 25 minutes ago, pizzaman09 said: What is the condition of the harmonic balancer rubber? Could the center be spinning inside the outer ring? Oooooo I didnt think of this but I can see there not being enough material left on the balancer to drive the pulleys. Link to comment Share on other sites More sharing options...
pizzaman09 Posted Saturday at 06:54 PM Share Posted Saturday at 06:54 PM I've seen an alternator locked solid on an XJ, if the balancer rubber is weak, then maybe it powers through and slips instead of burning the belt up. Link to comment Share on other sites More sharing options...
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