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Failed compression test


This is a discussion on Failed compression test within the How To forums, part of the Jeep Liberty - KJ (02 to 07) category!
Yep should do no damage to the bottom end of the engine....

In this section it explains how to do installations and modifications.


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Old 06-19-2015, 07:47 AM   #11 (permalink)
 
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Yep should do no damage to the bottom end of the engine.
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Old 06-19-2015, 06:38 PM   #12 (permalink)
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How the hell do you get those stupid plastic clips that hold the heater hoses off?
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Old 06-19-2015, 09:48 PM   #13 (permalink)
 
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Originally Posted by Dannyboy745 View Post
How the hell do you get those stupid plastic clips that hold the heater hoses off?
Don't bother with them. Instead take off the oil filler neck - there are 2 small bolts that hold it to the block. Remove them and the filler neck with the heater hose clips (and therefore heater hoses) can be moved out of the way.

Bob
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Old 06-20-2015, 12:01 AM   #14 (permalink)
 
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Yea after reading into it some states cover used cars under the lemon law for a month or two after purchase but not florida only cover new or new lease cars so yea no that wont work
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Old 06-22-2015, 09:30 PM   #15 (permalink)
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So this job has turned to big a pain. Didn't know I was going to need special tools just to get the engine apart. Now I have to spend like $130 bucks on tools I will almost never use.
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Old 06-23-2015, 12:57 AM   #16 (permalink)
 
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Rent them or buy them and sell them off afterwards.
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Old 06-25-2015, 08:07 AM   #17 (permalink)
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How many miles does this engine have on it? It's been a given since T model days that doing the head(s) will cause increased oil consumption. How much is usually in proportion to mileage/wear on the lower end.

Someone mentioned a used engine transplant. Good luck with that! the 2002-03 3.7 is very model specific. ALL of em are 12+ years in service, and most are well over100K miles. When I had to re-engine mine a few weeks ago, these engines were going for 1,500.-1,800. bucks with a 30day warranty. New reman from O'Reilly with unlimited mileage, 2 year, labor inclusive warranty was $3k That didn't take long to ponder.

As far as a back yard valve/head job? Not for the faint hearted, but well within most mechanically inclined, industrious individuals scope. IF you're sweating a couple plastic hose clamps,,,,,,,,,,,, might not work out too well.

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Old 06-25-2015, 07:29 PM   #18 (permalink)
 
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Originally Posted by M38 Bob View Post
How many miles does this engine have on it? It's been a given since T model days that doing the head(s) will cause increased oil consumption. How much is usually in proportion to mileage/wear on the lower end.

Someone mentioned a used engine transplant. Good luck with that! the 2002-03 3.7 is very model specific. ALL of em are 12+ years in service, and most are well over100K miles. When I had to re-engine mine a few weeks ago, these engines were going for 1,500.-1,800. bucks with a 30day warranty. New reman from O'Reilly with unlimited mileage, 2 year, labor inclusive warranty was $3k That didn't take long to ponder.

As far as a back yard valve/head job? Not for the faint hearted, but well within most mechanically inclined, industrious individuals scope. IF you're sweating a couple plastic hose clamps,,,,,,,,,,,, might not work out too well.

Bob
You can use a 3.7 from up to at least a 2012 Chrysler product. It requires some internal work to swap over the crankshaft ring and the cam sprocket but it saves a LOT of money. The reason original '02 and '03 Liberty engines are expensive is because most folks aren't willing to dive into the engine a little bit so they want a direct replacement. It's not a technically difficult project, just takes a little time and patience.

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Old 03-13-2018, 06:59 PM   #19 (permalink)
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So looking at a very similar issue.
Just got back from a mechanic who told the wife that cylinder 2 had 5lbs compression. Same engine 2002 3.7 Jeep Liberty.

Does the compression indicate the problem is with the valve seat or does it require more diagnosis?

He quoted me $4800 to replace the engine. That seems very high to me. Also if you cant get a new engine then maybe not worth the effort?

I just don't have the money to put out right now and wondering if I can be the next expert youtube trained mechanic or I could at least find someone who can do it for much much less.
TKS,
Chris
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Old 03-15-2018, 09:38 PM   #20 (permalink)
 
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Originally Posted by cnull View Post
So looking at a very similar issue.
Just got back from a mechanic who told the wife that cylinder 2 had 5lbs compression. Same engine 2002 3.7 Jeep Liberty.

Does the compression indicate the problem is with the valve seat or does it require more diagnosis?

He quoted me $4800 to replace the engine. That seems very high to me. Also if you cant get a new engine then maybe not worth the effort?

I just don't have the money to put out right now and wondering if I can be the next expert youtube trained mechanic or I could at least find someone who can do it for much much less.
TKS,
Chris
Being a 2002 your screwed with pricing since they changed the cam/crank tone rings for later model years.Your going to pay twice the price for '02's then newer models.

You can drop in a used newer engine but you will have to swap the older cam/crank tone rings in to work.

There is a "how to" somewhere on this sit on what is needed and how to do it.Not saving much if any over paying for the correct remaned engine from the start.
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