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post #1 of (permalink) Old 12-21-2001, 10:28 AM
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Engine Questions (AMC 304)

Ok I'm looking at buying a 79 CJ5 with the AMC 304 in it. I'm looking at putting a TBI Fuel Injection Kit on it, if I get this jeep. The engine burns a little oil, and all the cylinders have 120+ lbs of pressure, except cylinder #8 which is just barely over 100lbs. When first started up during the day it blows a moderate cloud of white smoke. They say it's not uncommon for these engines to burn about a quart of oil in 3k miles, but this engine burns a little more than a quart in 1k miles. The jeep has 150K some miles on it. My main concern is I don't want to do this if the engine will crap out anytime soon, which I know is a hard thing to determine. Could I assume the majority of the oil burning is going on in the 8th cylinder or is it possible oil is leaking down the valves in which a head rebuild would help out tremendously (just with the oil burning)? I really don't want to rebuild the entire engine if I can avoid it, and a engine swap would be out of the question as an entirely new painless wiring kit was just put in. I realize this engine won't last forever but If I can get at least 15k to 20k miles out of it I would be happy. What do you guys think?

Steven McIntosh
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post #2 of (permalink) Old 12-21-2001, 10:58 AM
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Re: Engine Questions (AMC 304)

White smoke is coolant. Blue is oil. Might thre be a head gasket problem around #8? Does it loose any coolant?

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post #3 of (permalink) Old 12-21-2001, 02:52 PM
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Re: Engine Questions (AMC 304)

thats a wore out engine it sounds like, and I wouldnt put any money into a 304 really, you could roll the dice on a used 360 for a few hundred$ and try it? it will bolt in, you only need a flywheel.

I surely woudntt waste money on a head build with a engine of questionable condition.

do a leak down test to determine where the leaks are and after its been properly assesed you can decide if its worth spending any $$ on.

buying a Jeep with engine problems, it better be CHEAP


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post #4 of (permalink) Old 12-21-2001, 06:49 PM
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Re: Engine Questions (AMC 304)

Does it have the 3 speed or 4 speed ? How is the body ? Ozark is right , that engine sounds pooped and could be a head gasket . With all the 360`s around I would find a good one and go that route . Grab a TBI unit off a Chevy 350 and away you go .The only reason I used my 304 is because it only had 10,000 miles on it and it scoots along pretty good with the Comp Cam I put in . And 16 or so MPG [img]/wwwthreads_images/icons/smile.gif[/img]

<font color=black>Jeff [img]/wwwthreads_images/icons/cool.gif[/img] </font color=black>
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post #5 of (permalink) Old 12-21-2001, 09:07 PM
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Re: Engine Questions (AMC 304)


I have to agee with the other posts. The motor has seen better days. I have over 175K on my 78 CJ5 304 and it runs ok. It does burn oil but, oil is cheap and the jeep is old enough that I do not have to have pass DEQ.

Check to see if the CJ is a factory 4 speed. If it is, the tranny will be the coveted T18 with a 6.32 1st gear. The T18/304 combo was only offered from the factory in that year (79). This makes the jeep worth more to me and I would deal with the motor issue as long as the frame and body are straight and the price is not too high ($3500 or less depending on the other goodies it comes with). AMC 360's are easy to find for a swap. (Don't rebuild the 304 unless you want to as the rebuild kit costs more for the 304 than the 360.) Try to get one from a manual tranny truck (if AMC ever made one, not sure) to get the flywheel or it will cost about $250 more to get a new one.

Good Luck!

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