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Water pump rotation |
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GremlinP38
AMC Apprentice Joined: Jun/30/2012 Location: Michigan Status: Offline Points: 134 |
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Posted: Jun/16/2019 at 2:48pm |
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i have a friend that has had an overheating problem on his ‘73 6 cylinder Gremlin and he finally figured out today that the impeller was a reverse rotation design. He knows what to look for now but we were wondering what used a backwards rotation setup. I did a quick search of the forums but didn’t see anything.
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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v belts rotate one way. And most surpentine belts rotate the other way. Sounds like you first got the wrong pump.
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GremlinP38
AMC Apprentice Joined: Jun/30/2012 Location: Michigan Status: Offline Points: 134 |
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Definitely wrong pump. Just wondering what the normal application should have been. Jeep? Later Eagle? Doesn’t look like the one on my 99 Cherokee. Just curious.
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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9060 |
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Normal application would have been an air conditioned Eagle with a serpentine belt system. The water pump rotation is reverse to the V-belt style. Joe
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Happiness is making something out of nothing.
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19689 |
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Any serpentine belt AMC 258 six with a fan, around 82-88. The 4.0L uses a serpentine belt and the same reverse rotation water pump. the XJ Cherokee uses the same pump body and impeller, but a shorter shaft and a different bolt pattern on the hub so you can't bolt a fan to it. Wranglers and Grand Cherokee 4.0Ls use a different hub and engine driven fan. The bearings in the pump with and without engine driven fans are different also.
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Frank Swygert
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billd
Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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Beware that we can say SOME in those years used the serpentine belt, but not all. Not sure what the criteria was from the factory but every Eagle I've ever owned was v-belt while my 4.0 equipped vehicles were all serpentine and yet SOME Eagles did have serpentine.
AC didn't seem to be the difference as the non-AC Eagles appear to be quite rare. I know they exist but of all of the Eagles I have seen, worked on or owned, every one of them had AC. So we can't say "AC equipped" cars - some yes, not all. Years? I know of those of similar or same years as those I've owned which were serpentine and not v-belt like mine. Would love to know the criteria - why did some get serpentine and yet in the same year - even with AC, most got v-belt. I don't have 1980 and later parts books to go by and see if I can find a pattern. Farna is also right - although I know it wasn't part of the question - some jeeps had the fan offset, not in the center on the pump like, for example, the ZJ. The ZJ 4.0 is a perfect match to the 258 fan and water pump setup except for the drive - serpentine vs v-belt. For Jeep we know it was a design and engine bay issue as far as the fan on the pump or not, that sort of thing - but why did some Eagles have serpentine and others not? To be sure when I buy a water pump I always take my original with me and have them open the box, lay them together and compare for an exact match. Glad I did with the 4.0 years ago because at first they brought out the wrong pump even though I specified 94 ZJ 4.0 Take an example, compare impeller, shaft and hub, etc. |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19689 |
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I've seen Eagles the same years and equipment, early to mid 80s models, some with V-belts others with serpentine. I've been told that the Canadian built models starting about 81 or 82 all had serpentine and the Kenosha built kept V-belts up to a point, but I can't substantiate that, and don't know when Kenosha switched to serpentine. I'm pretty sure the last couple years (87-88) all Eagles had serpentine belts, but not 100% on that. I've seen an 88 model with serpentine belt, at least I was told it was an 88... didn't check.
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Frank Swygert
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73Gremlin401
Supporter of TheAMCForum Joined: Mar/02/2013 Location: Stmbt Sprgs CO Status: Offline Points: 955 |
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The Eagle/Concord/Spirit serpentine setup started with California market cars - apparently to prevent owners from removing/disconnecting the air-pump on the 81-83 cars. It did show up randomly on 49 state cars during that period of time, but there doesn't seem to be any rhyme or reason behind it, possibly more a supply-side issue at the factory, but the actual reason is probably lost forever.
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73 Gremlin 401/5-spd.
77 Matador Wagon 360/727. 81 Jeep J10 LWB 360/4-spd 83 Concord DL 4-dr 258/auto |
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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9060 |
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Your reasoning is sound, but the reference I used for my first answer (which I cannot recall now) mentioned specifically that early Eagles with air conditioning used serpentine belts. I like your answer better though. Joe
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Happiness is making something out of nothing.
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