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Unread 07-02-2013, 10:31 AM   #1
StanF
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4.0L Craigslist Engine - How to Check it?

Bought a 4.0L Craigslist engine for $250. Supposedly out of a 1995 Cherokee with 150K miles, but who knows.

Will be for a 2.5L to 4.0L swap in my 1995 YJ. I'm considering three options:

1) Full rebuild ($$$)
2) Head job, cleanup and external accessory replacements ($$)
3) Minimal cleanup, etc, and swap it in. ($)

If the engine is in good shape, I'd like to save some money, and NOT do the full rebuild. But I don't want to get the engine in, and then immediately pull it out for a spun bearing, cracked head or something.

Is there anything I can do to an engine on a hoist to figure out its condition? Ideas? Suggestions?

Thanks!

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Unread 07-02-2013, 11:49 AM   #2
Mud Machine
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Do a compression test on each cylinder, (if you don't own one you can rent them at most parts stores) check oil for any obvious contamination or neglect, spark plugs may give some indication of maintenance, shine flashlight into valve cover to look for sludge, and check the block for any serious oil leaks new or ongoing. These are a few basic things that may help you.
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Unread 07-02-2013, 01:53 PM   #3
StanF
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Quote:
Originally Posted by Mud Machine View Post
Do a compression test on each cylinder, (if you don't own one you can rent them at most parts stores) check oil for any obvious contamination or neglect, spark plugs may give some indication of maintenance, shine flashlight into valve cover to look for sludge, and check the block for any serious oil leaks new or ongoing. These are a few basic things that may help you.
Thanks - all good suggestions! I was planning to do all this, but the compression test is problematic without a bell housing (I don't have an AX15 yet). Was definitely planning to drop the oil pan and remove the valve cover for a closer inspection.
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Unread 07-02-2013, 08:25 PM   #4
ltrail
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Cylinder leakage test may be better if it's not in the vehicle. This will give an idea of how the engine is doing as fat as ring sealing, and valve seats.
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Unread 07-02-2013, 10:47 PM   #5
caoboy
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Leakdown test will be more accurate.

AT LEAST:

Waterpump

Rear/Front main seals

Valve cover gasket

Intake manifold and throttle body cleaning/gaskets

Oil pan gasket

You don't want to do work twice, and if it passes the leakdown, then you won't need to go into the head/block. I'm going through this with my brother with his Honda, he wants to get the engine in asap, I keep telling him to not rush it and swap out every possible seal/gasket minus the head gasket so that way the motor will be good for the next 90K.
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Unread 07-02-2013, 10:54 PM   #6
WhiteOut
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^ This is what I just did.

New waterpump and t-stat, valve cover gaskets, rear main seal, new oil pump, oil pan gasket, throttle body cleaning, throttle body gasket, CPS, new plugs, upper and lower rad hoses. New battery terminals and connections for the winch. All are MUCH easier when the new engine is on a stand.
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Unread 08-04-2013, 07:56 PM   #7
petey156
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If you are pulling the oil pan, You might as well pull a few rod and main caps off and check the bearings for copper color showing. If all looks good, I would put a high flow oil pump in.
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