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Unread 03-28-2013, 11:58 AM   #1
colejacobs
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Life of a 258

I am curious how long a properly maintained engine has lasted folks? I hear people brag about low mileage on an original engine all the time; heck my '77 CJ5 has 41K original and runs like a champ. But what have some of you been able to squeeze out of a 258 when properly maintained?

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Unread 03-28-2013, 12:34 PM   #2
WindKnot
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1977 CJ7 
 
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I am convinced that after the end of WWIII the cockroaches will be driving around in I-6 Jeeps! If AMC could've figured out better gas mileage and emissions for them they'd still be around. The EPA was the only thing that could kill them!
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Unread 03-28-2013, 12:43 PM   #3
adams1985cj
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I had my first CJ for about 6 years and had 215,000 original miles on it when I sold it. Still ran perfect never had any issues with it. That was in 2002 from what I understand the guy still has it and has not replaced the engine. Not sure of the miles now.
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Unread 03-28-2013, 12:48 PM   #4
jaketr1
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1999 TJ Wrangler 
 
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iv heard 300k is not unheard of
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Unread 03-28-2013, 01:23 PM   #5
colejacobs
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Wow unreal. I see where people rebuild their 258's or replace them with something else and have always been curious.
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Unread 03-28-2013, 02:51 PM   #6
Renegade82
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I have roughly 150k on mine before my restore. Hope it last a good bit longer.
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Unread 03-28-2013, 07:08 PM   #7
only in a jeep cj
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I got 200k on mine when a piston skirt broke. I drove it like a stolen sports car for over 150k of that.
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1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
2003 Inca Gold TJ Rubicon
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Unread 03-29-2013, 07:09 AM   #8
jaketr1
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mine when last tagged in 2010 before i got it title said 189,000 but who knows but other than a carb rebuild and some exhaust holes it runs good.
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Unread 03-29-2013, 07:43 AM   #9
Caish
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The 4.0 is known to last 200k to 300k miles.
The 258 was never known to be a Lemon, just an oil leaker.
I would expect 200k+ from the latter year models,
and the early ones 100k to 150k reasonably.

Why the difference?
Research and Development a lot changed in metallurgy and
engineering from 1972 to 1987 (last year the 258 was used if I remember right)
engineers learned more about why some parts fail and improved them
they learned better bore shapes, such as being wider at the top than bottom,
Better rings and aluminum alloys for the pistons, and the list goes on.
I just want to know why on the 259 and 4.0 they could not make a timing chain
that that didn't have 15 to 20 degrees of slop new.
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Unread 03-29-2013, 07:47 AM   #10
Slydeco
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1985 CJ7 
 
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Mine thru a pushrod up into the valve cover and layed down,,But still ran on 5 Cylinders!!
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Unread 03-29-2013, 01:45 PM   #11
NJPiney
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235k '89 yj. Has a little valve tap and oozes oil. Still cookin!
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Unread 04-04-2013, 04:49 PM   #12
uptillnow
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Quote:
Originally Posted by Caish View Post
The 4.0 is known to last 200k to 300k miles.
The 258 was never known to be a Lemon, just an oil leaker.
I would expect 200k+ from the latter year models,
and the early ones 100k to 150k reasonably.

Why the difference?
Research and Development a lot changed in metallurgy and
engineering from 1972 to 1987 (last year the 258 was used if I remember right)
engineers learned more about why some parts fail and improved them
they learned better bore shapes, such as being wider at the top than bottom,
Better rings and aluminum alloys for the pistons, and the list goes on.
I just want to know why on the 259 and 4.0 they could not make a timing chain
that that didn't have 15 to 20 degrees of slop new.
I have soaked the new timing chain in hot oil for hours, let it cool down, then install them. After about 1,000 miles (nothing really) re-degreed the cam and found at least 15 degrees of stretch or retarded cam timing. I used a Morse chain with little bushings. The cheaper timing chains have much worse stretch to them. (Dynagear)
My two cents.
UPTILLNOW
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Unread 04-05-2013, 10:02 AM   #13
1986cj
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I have 198,000 on my 86 and has some piston slap for the last 50,000 or so, but uses no oil between changes and still passes emissions with no problem. I drive to and from the mts and I run a average of 65+ through south park with no problems.
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