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Old 03-11-2014, 01:01 PM   #1
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Changing out 4.0L 99 TJ

So I bought a new I6 4.0L with 110k on engine for my 99 TJ. About to pullout the old one and my coworker mentioned you may want to change the engine mounts- all the vibrations may made em weak.

He makes a good point but I'm curious the logistics. There's only 2 mounts I can see, is it worth them to change if jeep has 220k on it? and I hear it's best to get them from the dealer since after market engine mounts wear out and can cause engine to fall and yielding a whole slew of issues.


Lil advice this is my first engine swap. I expect there to be quite a bit of cursing like everyone warns lol

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Old 03-11-2014, 01:31 PM   #2
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OEM Engine mounts are durable. I would just inspect and replace if needed.

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Old 03-11-2014, 02:04 PM   #3
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At 220k it's probably a good idea, I just replace mine at 245k and it's cured my exhaust manifold from cracking every few thousand miles
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Old 03-12-2014, 07:07 PM   #4
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OEM Engine mounts are durable. I would just inspect and replace if needed.
The engine was rebuilt before the prev. Owner told me.

I plan to inspect them anyway. What am I looking for? Cracks? This is the most intimitae I've gotten with my engine before aside from replacing starters
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Old 03-13-2014, 06:42 AM   #5
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Originally Posted by Zeraybah Baba View Post

The engine was rebuilt before the prev. Owner told me.

I plan to inspect them anyway. What am I looking for? Cracks? This is the most intimitae I've gotten with my engine before aside from replacing starters
Cracks and excessive amount of compression...
I could stick a screwdriver through mine they were so worn...
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Old 03-13-2014, 09:48 AM   #6
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Cracks and excessive amount of compression... I could stick a screwdriver through mine they were so worn...
Dang! I'll be sure to keep an eye out for it. Thanks for illustration

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