4.0 Master Rebuild Kit - JeepForum.com
 
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post #1 of 6 Old 09-25-2020, 04:33 PM Thread Starter
jkountz67
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4.0 Master Rebuild Kit

Ive got a 2003 WJ with the 4.0. Its running fine but at 237K its getting a little tired. I want to do a complete and total rebuild BEFORE disaster strikes!
Im looking for recommendations for a complete master rebuild kit. I have searched and found several but honestly they all look the same. I prefer one that allows me to select oversized bearings and such if need be, I guess I wont really know that until the machine work is done.
Just wanted to pick the collective brains here and see what others experiences have been.

Thanks!!

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post #2 of 6 Old 09-28-2020, 08:58 AM
Mousejockey
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Got mine from a guy on Ebay, name brand parts, head gasket was wrong to go figure

Make sure to check valve lash when assembled, head and block work made my push rods a tad long, had to shim the rockers
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post #3 of 6 Old 09-29-2020, 04:40 PM
BlueFl.Wrangler
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Quote:
Originally Posted by Mousejockey View Post
Make sure to check valve lash when assembled, head and block work made my push rods a tad long, had to shim the rockers
How did you come to figure that out?

Diplomacy is the art of telling people to go to hell in such a way that they ask for directions

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post #4 of 6 Old 09-30-2020, 08:05 AM
Mousejockey
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Loud clanking when I fired it up

Its why I mention it to anyone rebuilding so they dont get the same surprise
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post #5 of 6 Old 09-30-2020, 11:15 AM
BlueFl.Wrangler
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Quote:
Originally Posted by Mousejockey View Post
Loud clanking when I fired it up

Its why I mention it to anyone rebuilding so they dont get the same surprise
So how did you figure out how much shim to install?
Are there specific shims for these-- 4.0 specific?
Thanks

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post #6 of 6 Old 09-30-2020, 11:58 PM
Mousejockey
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https://www.summitracing.com/parts/cca-7704-1

Would have to dig abit to find the shim kit I used

Before someone chimes in, Yes you can buy push rods in the correct length you need, Yes shimming under the rocker arm does effect the geometry on the valve train.

Proper length rods are ideal
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