CrustyBoy Posted May 17, 2022 Share Posted May 17, 2022 Hello Everyone, I recently bought an '88 2WD Comanche with a 4.0L and I'm pretty sure the Peugot 5-speed trans. It runs alright, starts off a little rough when cold but after it's warm it idles steady at 700RPM and runs very smooth. After I got it I immediately started doing basic maintenance. Spark plugs and an oil change. I noticed the serpentine belt had a small squeek so I changed that out along with the smooth idler pulley. Anyway, after I replaced those things and tensioned the new belt, it seems like my squeek has turned into a full-blown squeel. I'm pretty sure it's coming from the water pump. Shopping online I'm noticing these water pumps come with different hub sizes? Is that right? Is there an easy way to identify which one I have without removing it from the engine first? I'll probably go ahead and do the grooved idler pulley as well when I get to doing the water pump replacement. Appreciate any insight yall can give me. These trucks are so cool! Link to comment Share on other sites More sharing options...
eaglescout526 Posted May 17, 2022 Share Posted May 17, 2022 Mopar is the way to go. They still make them for the 4.0L. Link to comment Share on other sites More sharing options...
JMO413 Posted May 17, 2022 Share Posted May 17, 2022 1 hour ago, eaglescout526 said: Mopar is the way to go. They still make them for the 4.0L. Link to comment Share on other sites More sharing options...
75sv1 Posted May 18, 2022 Share Posted May 18, 2022 I do use NAPA water pumps. No real issues. I did install a MOPAR on one of my XJs. Best bet for reliability. As for variations, as I remember there are two different lengths or heights for water pumps. This matched to the pulley your original water pump has. Link to comment Share on other sites More sharing options...
scguy Posted May 18, 2022 Share Posted May 18, 2022 Mopar is best, but I haven't had any problems with Gates stuff Link to comment Share on other sites More sharing options...
cruiser54 Posted May 18, 2022 Share Posted May 18, 2022 country of origin is a good factor to consider. Link to comment Share on other sites More sharing options...
CrustyBoy Posted May 18, 2022 Author Share Posted May 18, 2022 Thanks for all the advice everyone. I shot from the hip and ordered this: https://www.ebay.com/itm/202020914981 Part number says V9900083. Let me know if I got ripped off or bought the wrong part if you can tell haha.. Link to comment Share on other sites More sharing options...
Parei_doll_ia Posted May 18, 2022 Share Posted May 18, 2022 AC Delco is good, I had a FlowKooler for about 2 days and had nothing but overheating issues and weeping coolant from the pump. Link to comment Share on other sites More sharing options...
CrustyBoy Posted May 21, 2022 Author Share Posted May 21, 2022 Well, I installed the new Mopar water pump and replaced the hoses. Seems to be working well. Now I'm chasing down a noise from another pulley. Does anyone know the correct part number for this pulley?? The smooth one to the right of it was real easy to find at a parts store, but this one is a pain in the @$$. The one I got from Oreillys is plastic and did not have the correct depth/shape to clear the bracket it mounts to. The original one is metal/grooved and has a deep side to help it clear that metal. Anyone familiar? Link to comment Share on other sites More sharing options...
Heinri_k Posted May 21, 2022 Share Posted May 21, 2022 On 5/18/2022 at 1:16 PM, keeponjeepinon said: AC Delco is good, I had a FlowKooler for about 2 days and had nothing but overheating issues and weeping coolant from the pump. Yikes. I read good things about flowkooler and decided to order one. Mines in the mail. Hopefully I don't have similar issues... Link to comment Share on other sites More sharing options...
cruiser54 Posted May 22, 2022 Share Posted May 22, 2022 5 hours ago, CrustyBoy said: Well, I installed the new Mopar water pump and replaced the hoses. Seems to be working well. Now I'm chasing down a noise from another pulley. Does anyone know the correct part number for this pulley?? The smooth one to the right of it was real easy to find at a parts store, but this one is a pain in the @$$. The one I got from Oreillys is plastic and did not have the correct depth/shape to clear the bracket it mounts to. The original one is metal/grooved and has a deep side to help it clear that metal. Anyone familiar? You have no AC? Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 22, 2022 Share Posted May 22, 2022 On 5/18/2022 at 12:16 PM, keeponjeepinon said: AC Delco is good, I had a FlowKooler for about 2 days and had nothing but overheating issues and weeping coolant from the pump. I also ran the AC Delco Gold pump after pulling a flowkooler. The flowkooler requires significantly more fluid capacity ie much larger radiator. Link to comment Share on other sites More sharing options...
CrustyBoy Posted May 22, 2022 Author Share Posted May 22, 2022 8 hours ago, cruiser54 said: You have no AC? Yep here's what I got. That top-left pulley is what I'm looking for. Going to go through your list as much as I can. Let me know if anything bad jumps out at you in the picture. The hose that runs from the radiator cap to the surge tank is pretty close to the fan. I think I can change that just by rerouting it. Link to comment Share on other sites More sharing options...
75sv1 Posted May 22, 2022 Share Posted May 22, 2022 10 hours ago, ghetdjc320 said: I also ran the AC Delco Gold pump after pulling a flowkooler. The flowkooler requires significantly more fluid capacity ie much larger radiator. I think Hornbrod and GoJeep had isses with Hi-Flow water pumps, Hesco and Flowcooler. They had to put a restriction in the upper hose. I think Go-Jeeps website is still up. Link to comment Share on other sites More sharing options...
cruiser54 Posted May 22, 2022 Share Posted May 22, 2022 Take the pulley off and take it to the parts store. Napa comes to mind. Heck, you might be able to replace the bearing. Link to comment Share on other sites More sharing options...
omega_rugal Posted May 22, 2022 Share Posted May 22, 2022 5 hours ago, CrustyBoy said: Yep here's what I got. That top-left pulley is what I'm looking for. Going to go through your list as much as I can. Let me know if anything bad jumps out at you in the picture. The hose that runs from the radiator cap to the surge tank is pretty close to the fan. I think I can change that just by rerouting it. Factory Non AC... unscrew it, if it woobles replace the bearing Link to comment Share on other sites More sharing options...
1987Comanche Posted May 22, 2022 Share Posted May 22, 2022 It's an A/C bypass/blockoff/ or idler pulley, depending on what site or store you're searching. Last time I checked they made a new one for the HO engines but not the Renix ones. So far the AC Delco w/p is doing well. I had to replace the AutoZone w/p 2x, both times started making scary noises. The first one left a scar on the outside of cyl #1 water jacket. Link to comment Share on other sites More sharing options...
1987Comanche Posted May 22, 2022 Share Posted May 22, 2022 Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 22, 2022 Share Posted May 22, 2022 I believe the Hesco and flowkooler are practically the same unit. The Hesco bored thermostat housing was also an issue contributing to overheating. The oem system can’t really be significantly improved upon without a significant capacity upgrade in the radiator. Novak or the old JeepSpeed Griffith come to mind. Otherwise, the oem components are the way to go imo. Best system I ran was ac delco gold water pump (or the oem Mopar), Mopar hoses (with the anti-collapse spring), Mopar 195 t stat with air bleed hole, oem 7 blade mech fan with oem shroud, later xj style 10 blade e fan and a Mishimoto radiator. AC full blast in the tropics going up long steep grades with zero issues. It’s just been my experience that most of these cooling system “upgrades” don’t work well as stand alone “upgrades”. Even on a stroker I’d go with a stock system (maybe mishimoto or cold case radiator) Link to comment Share on other sites More sharing options...
cruiser54 Posted May 22, 2022 Share Posted May 22, 2022 https://duckduckgo.com/?q=53002903+pulley&atb=v314-1&ia=web Link to comment Share on other sites More sharing options...
ratrapp Posted May 22, 2022 Share Posted May 22, 2022 i used the hesco water pump and t stat housing on my old 88 mj.the w/p had a bad bearing after 2 days of use that of course they wouldnt warranty and i never could get the t stat housing to seal right.i put a parts store gmb pump and the factory housing back and had no problems. Link to comment Share on other sites More sharing options...
75sv1 Posted May 23, 2022 Share Posted May 23, 2022 Heso does or used to make a spiral vane water pump. When I bought one, it was like the Flowcooler. The impellor was a one piece though. I think the original Flowcoolers, they riveted a plate on top of the impellor. They would sometimes come off from reports. I did read on another web board the they recently bought a Hesco and it had their spiral impellor. I think a GMP housing. So, worth the $$$, probably not. I think a possible or advertised 5 hp gain. I did talk to the guy I bought my stroker kit from. He just said a stock water pump. I'll probably use the Hesco (Flowcooler impellor) on it. If $$ are there, I am thinking a Davis radiator. I also want to change the transmission fitting to the front and the overflow bard to the drivers side. Also, there is the thermostat to talk about. I would avoid Mr. Gasket. I have has two of them fail. One came apart. The other, just locked up. These were the Hi-flow types. I have a Stewart planned for the Stroker. I did get some NOS Carrols and another brand off of E-Bay to try one some other motors. I do have a mini-stroker build going on for the MJ. I'd probably just go Super Stant for the Thermostat for the OP. Link to comment Share on other sites More sharing options...
CrustyBoy Posted May 23, 2022 Author Share Posted May 23, 2022 18 hours ago, cruiser54 said: https://duckduckgo.com/?q=53002903+pulley&atb=v314-1&ia=web Went ahead and ordered the Crown Automotive unit that pops up in your search there. Thanks for that! We'll see how it works. If it's a dud I'll go the bearing replacement route instead. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 23, 2022 Share Posted May 23, 2022 3 hours ago, 75sv1 said: I think the original Flowcoolers, they riveted a plate on top of the impellor That was GMB high flow that was a two piece impeller design (at least my GMB high flow was like that). The flowkooler has been a billet spiral one piece impeller for a great many years. Whether or not Hesco originally designed the first billet impeller on a 4.0 water pump I don’t know but a very large number of hesco’s parts these days are rebranded markups. Link to comment Share on other sites More sharing options...
CrustyBoy Posted June 1, 2022 Author Share Posted June 1, 2022 Idler pulley came in but was the wrong part. I'm actually pretty sure the seller sent me the wrong part in the correct box (box said PN 53002903).. All of the pictures of the part online look like this (the original pulley looks like this too): The actual pulley I got looks like this and does not fit: Those fins that run from the inner bearing area to the outer edge rub against the metal mounting point for the AC. So buyers beware I guess? Just posting this for anyone who needs the same pulley. If anyone knows of a reputable source for parts like these I'd really appreciate it. Link to comment Share on other sites More sharing options...
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