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Unread 11-24-2010, 08:40 AM   #1
andr3w
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Putting new engine in TJ, what should I do to the engine first?

I just bought a 97 TJ with a blown 2.5 liter engine in it for really cheap...I have a 2.5 liter engine out of a rolled Jeep that I am gonna put in, but now I am wondering if there is any work I should do on the engine before swapping it in? I was already thinking about the rear main seal, valve cover gasket, etc...I would just like to replace stuff that might be an issue later down the road and would be easier to replace or fix while the engine is out of the Jeep.

Thanks,
Andrew

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Unread 11-24-2010, 08:52 AM   #2
tjwrangler99
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Dono if the 4cyl have the problem, but make sure the exhaust manifold isnt cracked.
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Unread 11-24-2010, 09:02 AM   #3
NotURMailman
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If you have the time, space, and equipment (and are really that concerned about it). You could put the engine on a stand, pressure wash it, and buy an engine gasket set and go to town replacing all of the seals and gaskets (obviously don't go replacing a good head gasket. WHile you have the valve cover and oil pan off you could clean out the engine oiling system really good. But, that's just if you feel like doing all of that just for a warm fuzzy...
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Be very careful with the wife mod. Uninstallation can be extremely expensive. Wife mods have been known to take the Jeep and all other mods during the uninstall process. Also, make sure you service your wife mod properly as often as humanly possible. Wife mods not properly serviced may malfunction or uninstall themselves at any time.
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Unread 11-24-2010, 09:04 AM   #4
tjwrangler99
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why not paint it =)

Make it look nice and new!
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Unread 11-24-2010, 09:05 AM   #5
hefightsfire
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Man I'd have a hard time putting the 2.5 back in. Have you considered just finding a 4.0?
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Unread 11-24-2010, 09:17 AM   #6
andr3w
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Quote:
Originally Posted by NotURMailman View Post
If you have the time, space, and equipment (and are really that concerned about it). You could put the engine on a stand, pressure wash it, and buy an engine gasket set and go to town replacing all of the seals and gaskets (obviously don't go replacing a good head gasket. While you have the valve cover and oil pan off you could clean out the engine oiling system really good. But, that's just if you feel like doing all of that just for a warm fuzzy...

What would you suggest is the best way to clean out the oiling system? I wouldn't mind taking the time and putting in new seals and gaskets, even if its just for the warm fuzzy.

@hefightsfire = I thought about putting in the 4.0, but I have the 2.5 liter already so I am just gonna put that in, plus its an easier install then the 4.0.
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Unread 11-24-2010, 09:34 AM   #7
NotURMailman
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With the engine on a stand and the valve cover, oil pan and manifilds off you can put a large drip tray under it, set a container of solvent so that the oil pump pick up is submerged, install a new oil filter, and spin the oil pump with a drill. Or you can re-install the oil pan without a gasket (after you clean the inside of the pan really good),re-install the valve cover without a gasket, install the new oil filter, fill the oil pan with five quarts of solvent, and spin the oil pump with a drill.

DO NOT turn the engine with the solvent in the oiling system!

Do this BEFORE you install any of the new seals!

After you do this, install another new oil filter and repeat the process with fresh oil to get ALL of the solvent out of there!

Replace ALL of the seals (other than the head gasket, but including valve seals) after you do this.

After you install the engine, be sure to use engine break in additive with high ZDDP.

I would probably go the re-install oil pan and valve cover with out gaskets route to avoid a huge mess. Be sure to clean the oil pan and valve cover really well first.

Make sense?
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Quote:
Be very careful with the wife mod. Uninstallation can be extremely expensive. Wife mods have been known to take the Jeep and all other mods during the uninstall process. Also, make sure you service your wife mod properly as often as humanly possible. Wife mods not properly serviced may malfunction or uninstall themselves at any time.
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Unread 11-24-2010, 09:47 AM   #8
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Replace the freeze plugs.
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Unread 11-24-2010, 08:12 PM   #9
mudb8
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Differential gears......
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Unread 11-24-2010, 09:00 PM   #10
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better cam
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