Engine 83 CJ-7 Will a 4.0 bolt in a 4.2
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Engine 83 CJ-7 Will a 4.0 bolt in a 4.2
- Thread starter Badmeester
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- 4.0 4.2 cj-7 engine swap intake manifold
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- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
While yes it will bolt in most of your components won't work for. The exhaust is completely different and intake has to be modified. Power steering (assuming you have it) won't bolt up. You will have to run an electric fuel pump as there is no provision on the 4.0 block for a mechanical fuel pump. The harmonic balancer is another issue as well since the 4.0 is a serpentine belt setup and the AMC 258 i6 / 4.2l is a vbelt. I'm sure I'm missing a few things as well.
yellow85cj
Senior Jeeper
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- 85 CJ7, 258,4.0 head, T177, D300, Dana 30, AMC 20, 3.54
The AMC 258 i6 / 4.2l intake will fit. Very minor work to make it line up with the 4.0 head. You will need the exhaust manifold from the 4.0. You can use the balancer if you use v belt alternator and power steering and water pump. The water pump should be for a AMC 258 i6 / 4.2l as the 4.0 water pump runs in reverse as it is for a serp belt. You can use the AMC 258 i6 / 4.2l flywheel and clutch, but have to use a AMC 258 i6 / 4.2l starter. As stated , electric fuel pump will be necessary . I have been using a 4.0 head on my AMC 258 i6 / 4.2l so I know the intake and exhaust will work together. I did have to mod the PS bracket to block slightly as the 4.0 is a little taller. You make have some difficulty finding a pilot bushing/bearing that will fit the 4.0 and the CJ Transmission . It is can be done. May have to find one that fits one or the other then do a little "machining". I'm starting the same thing you are asking about. Replacing the AMC 258 i6 / 4.2l with a 4.0 and keeping it carb'd.
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- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
If it were mine I'd just go ahead and do the complete 4.0 with fuel injection. More power better fuel economy and cold starts
Badmeester
Jeeper
Thanks for the fast replys.
I forgot to mention that i run a propane system, kinda the same system as a forklift.
I will install an electric fuelpump for backup or when it´s too cold to start on propane.
The evaporatorsolenoid from the propane installation is already relay controlled so i can switch between gas and propane.
If fuel prices here weren't that crazy high($9,20/Gallon) i would stick with regular gas and convert to fuel injection.
When i convert to fuel injection i need to change the propane installation and the car has to be re-inspected which is going to cost me another $2K.
I forgot to mention that i run a propane system, kinda the same system as a forklift.
I will install an electric fuelpump for backup or when it´s too cold to start on propane.
The evaporatorsolenoid from the propane installation is already relay controlled so i can switch between gas and propane.
If fuel prices here weren't that crazy high($9,20/Gallon) i would stick with regular gas and convert to fuel injection.
When i convert to fuel injection i need to change the propane installation and the car has to be re-inspected which is going to cost me another $2K.
- Posts
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- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
That does change things up a bit. As long as you're going through all this hassle you can take the crank and rods from your AMC 258 i6 / 4.2l and put them into the 4.0 and build a stroker motor.
Badmeester
Jeeper
If i had the time, parts and a nice place to work i probably would go that route. Goal for now is to get the jeep runnin and driving as cheap as possible so we can enjoy it this summer. I'm doing all the work on my driveway and shed(10ftx18ft)
End of the year is my new shop(33ftx33ft) finished and i will take my projects to a higher level.
End of the year is my new shop(33ftx33ft) finished and i will take my projects to a higher level.
- Posts
- 2,183
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- 642
- Location
- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
Keep us posted.
As far as the garage whatever size you're thinking go bigger. Mine is 36x30 with 12' ceiling. Thought it was more than enough. Now I'm looking at additions.
As far as the garage whatever size you're thinking go bigger. Mine is 36x30 with 12' ceiling. Thought it was more than enough. Now I'm looking at additions.
Badmeester
Jeeper
Haha, the more space you have the more cars you buy. In the Netherlands land is very expensive. I would have go bigger if the costs for land and permits weren't so high.
I'll keep you guys posted.
I'll keep you guys posted.
- Posts
- 2,183
- Featured
- 1
- Media
- 188
- Solutions
- 11
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- 642
- Location
- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
I know. I still have to many and want more. This was before I began thinning the heard
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- 84 CJ7 4 banger-owned since new in 1984 bought off truck at dealership - rebuilding 258, T176 with Sniper EFI D300 4:1 Lomax gears Twin Sticked 1 piece axels with locker
Looks like a bunch of crawfish ponds behind the garage there.
- Posts
- 2,183
- Featured
- 1
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- 188
- Solutions
- 11
- Thanks
- 642
- Location
- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
Coy ponds
My neighbor raises them. I've heard rumor he's the largest supplier in the US.
My neighbor raises them. I've heard rumor he's the largest supplier in the US.
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- 84 CJ7 4 banger-owned since new in 1984 bought off truck at dealership - rebuilding 258, T176 with Sniper EFI D300 4:1 Lomax gears Twin Sticked 1 piece axels with locker
My brother has 3 small ponds in his backyard with Coy.
- Posts
- 2,183
- Featured
- 1
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- 188
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- 11
- Thanks
- 642
- Location
- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
Probably came from my backyard. He has around 200 acres with deeds dating back to 1865
CJ
Admin
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- '72 CJ5, 401, T18, D20, D44, D30
'82 CJ8, 258, D300, AMC20, D30
4.0l vs AMC 258 i6 / 4.2l people ...
Badmeester
Jeeper
Hello everyone, here's a small update:
In the meantime i've bought (online) a 4.0 which was junk and was even worse then my own cracked AMC 258 i6 / 4.2l . The seller never responded again so i've got a nice 4.0 ornament in the backyard now.
I wanted to drive the jeep this summer so i pulled the exhaust/intake manifold and dremeld out the cracks and filled them with JB-Weld
Not really a pretty solution but the leak is fixed for now.
I drove around 200 miles and so far so good.
The plastic valvecover was leaking again and 2 of the 1/4 20 valvecover bolts we're stripped.
Fixed this with a Aluminum valvecover (RT35004) with 5/16 bolts.
Later this year when the shop is ready i'm pulling the engine and fix it the right way.
The search for a good engine continues.
In Florida is a Dutch guy that ships cars and parts to Europe.
If anybody knows a good used 4.0 or AMC 258 i6 / 4.2l for sale that can be shipped to (Palmetto) Florida, let me know.
In the meantime i've bought (online) a 4.0 which was junk and was even worse then my own cracked AMC 258 i6 / 4.2l . The seller never responded again so i've got a nice 4.0 ornament in the backyard now.
I wanted to drive the jeep this summer so i pulled the exhaust/intake manifold and dremeld out the cracks and filled them with JB-Weld
Not really a pretty solution but the leak is fixed for now.
I drove around 200 miles and so far so good.
The plastic valvecover was leaking again and 2 of the 1/4 20 valvecover bolts we're stripped.
Fixed this with a Aluminum valvecover (RT35004) with 5/16 bolts.
Later this year when the shop is ready i'm pulling the engine and fix it the right way.
The search for a good engine continues.
In Florida is a Dutch guy that ships cars and parts to Europe.
If anybody knows a good used 4.0 or AMC 258 i6 / 4.2l for sale that can be shipped to (Palmetto) Florida, let me know.
- Posts
- 2,183
- Featured
- 1
- Media
- 188
- Solutions
- 11
- Thanks
- 642
- Location
- Thurmont MD
- Vehicle(s)
- 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock
79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown.
89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown
92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear.
I have a 4.0 and a couple AMC 258 i6 / 4.2l in my shed. I don't know what shipping would be but your welcome to have em as I'm not going to use them.
CJ
Admin
- Posts
- 23,534
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- 4
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- 881
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- 50
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- Location
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- Vehicle(s)
- '72 CJ5, 401, T18, D20, D44, D30
'82 CJ8, 258, D300, AMC20, D30
An awesome gesture by a true gentleman Jeeper!
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