odd compression

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Mar 4, 2008 | 12:50 PM

MisterCMK

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From: Blue Hill Township

odd compression

I've got a 97 Dakota at work here and it has the AMC/Jeep 2.5L OHV I4. It has no compression on 1 and 4, 2 has low compression and 3 is normal. I pulled the valve cover and all of the rockers look fine and everything is moving. I'll probably pull the head next here as I'm thinking a headgasket. BTW, the engine has 180k on it.

Mar 4, 2008 | 01:34 PM

fordboy_52

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From: Abilene Kansas

did you do a leak down test? i would do this before doing anything else. you might be able to get away with some top end work with the heads still on the motor.

Matt

Mar 4, 2008 | 07:03 PM

MisterCMK

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From: Blue Hill Township

The mechanic that we took it to first did and said that it was leaking out the exhaust and the crank case.

I pulled the head off this afternoon. Stick a fork in 'er. She's done.

Mar 4, 2008 | 08:17 PM

fordboy_52

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From: Abilene Kansas

how did u not hear that!? lol

Matt

Mar 4, 2008 | 08:26 PM

Ford_Six

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From: The Big, Oregon

Looks like the 390 from my 72. Or the engine in my old Escort. That one dropped a valve seat and blew chunks into the other cylinders back through the intake.

Mar 4, 2008 | 09:21 PM

Eagle460

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I fail to understand how you could not hear anything with the engine running, looks pretty bad. Ouch.

Do you plan on replacing the engine with another of the same make? What's happening?

Mar 4, 2008 | 09:23 PM

MisterCMK

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From: Blue Hill Township

Quote:

Originally Posted by fordboy_52

how did u not hear that!? lol

Matt

The guy that was driving it said that it didn't make much noise and just turned off. I am surprised it wasn't more dramatic when the piston grenaded itself. Depending on when we can get a motor I'll post up pics of the oil pan.

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Mar 5, 2008 | 08:47 AM

MisterCMK

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From: Blue Hill Township

Quote:

Originally Posted by Eagle460

I fail to understand how you could not hear anything with the engine running, looks pretty bad. Ouch.

Do you plan on replacing the engine with another of the same make? What's happening?

I'm not sure yet. I'm pricing out engines for the truck. We will probably end up putting another 2.5 I4 in there and getting it back on the road. That is the simplest and easiest route at this point and it means that we won't be looking at purchasing another truck.

Mar 5, 2008 | 08:48 AM

#10

MisterCMK

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From: Blue Hill Township

Quote:

Originally Posted by Ford_Six

It probably didn't make much louder of a noise than the detonation that caused the damage-

Heh. I'm anxious to see what the piston looks like.

Mar 5, 2008 | 05:02 PM

#11

rebocardo

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From: Atlanta GA

Wow. This brings up a point of all the cars on CL with 150,000+ miles with "just needs a headgasket"

I wanted to buy a cheap Trooper 4x4 with 202,000 miles for $500 (nuked tranny) and he gave me a bunch of hassle because I wanted to do a compression test before I bought it. Thinking now I will skip it, has an anti-freeze leak ...