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Unread 11-14-2010, 07:28 PM   #1
funkysandman
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4.2 starter motor type

I've got an 85 cj7 that I swapped an 89 yj 4.2 in place of an amc 150.

I have a starter from an 82 4.2 but I'm thinking it may not be compatible with the 89 4.2. I looks like it would bolt right up, but the gear wheel looks like it would be engaged without turning the key. The 82 starter motor only has one terminal on it and no piggyback solenoid.

Anybody know if I can use the 82 starter or do I have to find a later yj version?

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Unread 11-14-2010, 08:54 PM   #2
fredrok
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It should mount the same and frankly, I believe it should work as well. I know the later model has a solenoid mounted because it's a high torque starter. The older is not but I have to believe it will still physically work. All you need to do is take a quick measurement from mounting surface to flywheel and then compare it to the starter nose measurement.

Let us know how it goes....
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Unread 11-15-2010, 08:05 AM   #3
funkysandman
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The gear wheel on the 82 starter sticks out about 3/4 inch...it looks like the teeth would be engaged as soon as I bolt in on...I'm going to return the 82 starter to the store if it doesn't work out, but I don't want to destroy it. Are the flywheels that much different from 82 to 89?
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Unread 11-15-2010, 10:54 AM   #4
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I believe the later models have the crank position sensor teeth on the wheel, but off hand not sure about dimensions. Sorry, wish I was more of a help.
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Unread 11-15-2010, 01:18 PM   #5
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Quote:
Originally Posted by funkysandman View Post
Are the flywheels that much different from 82 to 89?
No. They are interchangeable among 258's. The change came when YJ's went to 4.0s.
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Unread 11-15-2010, 01:55 PM   #6
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so should the 82 starter work on the 89 4.2?
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Unread 11-15-2010, 07:21 PM   #7
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Quote:
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so should the 82 starter work on the 89 4.2?
If you want some more proof, go on some of the chain store sites and compare the part numbers.
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Unread 11-15-2010, 07:36 PM   #8
wrongway92407
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If you use the 82 flywheel. 89 was a change year, all the 89's I've seen have the small starter. The later small starters will not work with the earlier flywheels the bolt pattern on the starters are the same. The 4.2 starter should hook up using the 2.5 connections. The 2.5 starter will not work it's to small and is the same as a ford fiesta, you just have to change the drive end housing. But if your drive end is good and you have to have a starter then it will work. 82 flywheel 82 starter, 89 flywheel 89 starter.
if you use the small starter just use the wires from the old solenoid. works great.
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86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
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Unread 11-16-2010, 09:42 AM   #9
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ok, got an 89 starter - it has 2 terminals - 12v power and lower voltage start signal, but does that mean I can get rid of the starter relay on the fender well?
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Unread 11-16-2010, 12:45 PM   #10
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You can but you may have to run jumpers from the batt cable on the starter to alt. I don't remember if the wires were long enough, I think they were. These are 4.0 starters. The 2.5 I have runs good but has 0 power when going up hill or crawling through large rocks, Tri County Gear has what they call an Inertia Ring that bolts to the flywheel to help keep it going in the rough stuff, but I'm just putting in a 4.0.
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My fleet:
86 CJ7 5.7 vortec. 4L60,D44's,OBA,Air tank bumpers w/D rings detroits,4.88,35" bfg, mt's 9500ti warn
86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
86 CJ7 bone stock, w/factory 44 never seen the dirt soon to be for sale
87 Wrangler also never seen the dirt.
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Unread 11-17-2010, 11:57 AM   #11
funkysandman
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89 starter works!
also noticed a bad engine ground while at it...that never helps!
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Unread 11-17-2010, 03:29 PM   #12
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Great, probably cranks a lot faster.
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My fleet:
86 CJ7 5.7 vortec. 4L60,D44's,OBA,Air tank bumpers w/D rings detroits,4.88,35" bfg, mt's 9500ti warn
86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
86 CJ7 bone stock, w/factory 44 never seen the dirt soon to be for sale
87 Wrangler also never seen the dirt.
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