naf Posted June 10, 2018 Share Posted June 10, 2018 (edited) Noticed my 99 MJ (EDIT: 89 MJ) was dripping coolant onto the driveway... After I add more coolant to the reservoir to start a steady drip again, the farthest I can see is that it is dripping onto the top of the serpentine belt as it wraps around the lowest pulley. Am I correct that the thing above the lowest pulley is the water pump? To get a better view, is the next step pulling the radiator fans? Edited June 11, 2018 by naf fix year, no time travelling Link to comment Share on other sites More sharing options...
AZJeff Posted June 10, 2018 Share Posted June 10, 2018 The lowest pulley is the crankshaft. The one directly above it is the water pump. There is a weep hole on the bottom of the water pump "snout" that supports the shaft sticking out of the front of the pump. The weep hole allows leaking water to leave the pump and avoid instantaneous distruction of the shaft bearings. SIgns of weepage at that hole means it is new water pump time. Link to comment Share on other sites More sharing options...
naf Posted June 11, 2018 Author Share Posted June 11, 2018 water pump replacement going pretty comedically bad so far i started the truck to move it to the shade with the fan removed, heard a clunk and now and i think i lost a piece... is there some kind of pulley that runs that fan that is behind the fan itself on the same bolts? anybody got a pic/diagram of it? either i lost a part or I'm real confused about where the belt is supposed to go on the fan, because theres no good place to put a belt on for the fan anymore. still trying to get the damn bolts of the water pump too :-( Link to comment Share on other sites More sharing options...
AZJeff Posted June 11, 2018 Share Posted June 11, 2018 Here is the belt diagram for the 4.0 with AC. Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 11, 2018 Share Posted June 11, 2018 I think this is correct for your 89? Unless you really have an uber-rare 99 MJ.. Link to comment Share on other sites More sharing options...
naf Posted June 11, 2018 Author Share Posted June 11, 2018 ya the second diagram looks right. (89 of course, haha) the part i lost was the fan pulley. wtf? pretty big part to disappear. o well, went and grabbed another one from the junkyard (but if i find mine in 30 days they take returns, woo) so i put the new water pump on the first time and tested it just by filling the overflow coolant tank. leaked around the gasket. i redo it, this time actually used gasket sealant. and then when I'm tightening the bottom bolt i break off the bolt :-) this is going great... Link to comment Share on other sites More sharing options...
AZJeff Posted June 13, 2018 Share Posted June 13, 2018 On 6/11/2018 at 9:41 AM, HOrnbrod said: I think this is correct for your 89? Unless you really have an uber-rare 99 MJ.. DOH.....I HATE when I jump the gun and don't check which FSM I consult for the pic. Yup, I posted the pic from the 2000 XJ manual. Your pic is correct. Sorry. On 6/11/2018 at 9:41 AM, HOrnbrod said: Link to comment Share on other sites More sharing options...
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