Factory put some 4.0's in the 86 CJ? - JeepForum.com
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post #1 of 16 Old 11-21-2019, 07:48 AM Thread Starter
John Strenk
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Factory put some 4.0's in the 86 CJ?

You find the most interesting things reading the Factory service manual.

This caught my eye in the 84-86 CJ-7/Scrambler Factory Service manual M.R. 252.
Not the manual for all the jeep vehicles.

1986-4-0-liter-engine..jpg

1986-4-0-intake-exhaust.jpg

I wonder if anyone had actually seen a 4.0 in a CJ other than ones put there ourselves.

It looks like a M.P.F.I. manifold but the mounting bolts go right into the Fuel Injector openings.

Name:  1986 4-0 FI.JPG
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post #2 of 16 Old 11-21-2019, 08:34 AM
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John that's a good question. Like all good questions asked here it will get many good answers and some will be better than others.

I will offer a conjecture. In order for technicians to use the 86 manual it should have been available for technicians to use early in the model year. Perhaps AMC anticipated running out of 4.2s and were going to use 4.0s later in the year. On the other hand wasn't the 4.2 offered in the YJ? The question I have is has anyone ever encountered a 4.2 "pre-cured sealed" valve cover and if so did they leak more or less than what we are used to?

Slightly off topic recently i was going through a major project on my 74. My neighbor who is a retired mechanic and worked for 7 years at a Jeep dealership told me when I referenced my digital TSM "We never used them d*** things!" You may be the first to ever read this section.

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post #3 of 16 Old 11-21-2019, 08:50 AM
87MJTim
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The 4.0 was not available until the 87 model year. It was only offered in the XJ and MJ models. The YJs only had 4.2 for 87-90. A 4.0HO was not available in the YJ until 91. For those four years (87-90) Jeep was producing both engines.

Unless someone can conclusively prove a factory 4.0 in a CJ, I will think the manual was printed/published in late 86/early 87 anticipating a 4.0 installation (which may not have happened).
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post #4 of 16 Old 11-21-2019, 08:55 AM
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I've probably read the '82 TSM 3 times from cover to cover. It is by far the best resource for working on our CJs. The sheer quantity of information can be a bit overwhelming, but if you use the alphabetical index to find the specific section you need, it's not bad at all.

I've never heard of any CJs with 4.0s from the factory, but we all know the strange things that happened at AMC over the years.

Matt


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post #5 of 16 Old 11-21-2019, 08:56 AM
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Printed/Revision date on that FSM? Maybe re-printed in 90/91 with updated parts and they copied the info from the YJ FSM?

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post #6 of 16 Old 11-21-2019, 10:05 AM
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Not trying to be arrogant; but with the number of people here and the years of personal experience, I'm going to say it never happened, or we would know about it already.

Sure, there are one off or odd dealer added 'factory' option from way back that pop up once-n-awhile and surprise us, but this would be known and documented by now.

I agree, this is referencing the later year 4.0L engines from '87 and up. I fact, rereading the highlighted passage, I believe it's actually just poorly written, as what they are saying is actually " all 4.0L engines, and some 4.2L engines from '86 and up...."

Likely they had used up the old style gasket and switched to the new one in late '86


JMHO

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post #7 of 16 Old 11-21-2019, 12:13 PM Thread Starter
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Well it appears there is a whole section on rebuilding the 4.0 at the back.

Looks like it applies to the CJ-7/Scrambler/YJ wrangler and others.

So they knew the YJ was coming out.

1986-4-0-general-info.jpg


Maybe the YJ manual was late in coming out so they used this instead. But boy, the electrical would be waaaayyy off.

Did the YJ ever come out with the Dana 44 axles?


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post #8 of 16 Old 11-21-2019, 12:23 PM Thread Starter
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Appears to be supplements to the CJ-7 manual added in 1987

suppliment-date.jpg



And found this diddy.


1986-height-adjustments.jpg


We all know about this....


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post #9 of 16 Old 11-21-2019, 12:25 PM
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Quote:
Originally Posted by John Strenk View Post

Did the YJ ever come out with the Dana 44 axles?
Nope, never.

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post #10 of 16 Old 11-21-2019, 01:14 PM
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Considering the 4.0 was introduced for the 87 model year in the XJ/MJ, it doesn't surprise me that a factory manual released in August of 1986 would have service info applicable to the 1987 model year.

1987 model year production for the YJ XJ and MJ began in July of 1986. The last CJ7 was produced in Jan 1986. So I highly doubt AMC had 4.0 engines laying around 6 months before they would have been needed.

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post #11 of 16 Old 11-21-2019, 01:24 PM
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Quote:
Originally Posted by JoonHoss View Post
Nope, never.

Hoss
This is only true for US/Canadian model YJ's.

The Dana 44 rear axle was used in some export models, mainly to the Middle Eastern markets.
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post #12 of 16 Old 11-21-2019, 02:02 PM
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I've seen things in shop manuals or parts fiches that never existed on the production vehicles, my assumption has always been it was added to the documentation when they were considering doing it so that the docs would be correct if it did happen. That would've been done before production, and there's no benefit to taking the time to remove it after production ends, so they leave it.

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post #13 of 16 Old 11-21-2019, 03:06 PM
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Quote:
Originally Posted by letitloose06 View Post
This is only true for US/Canadian model YJ's.

The Dana 44 rear axle was used in some export models, mainly to the Middle Eastern markets.
You are correct. (And I stand corrected)


I know way back one of the guys who frequented the YJ forum had a Canadian market YJ w/ a factory D44

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post #14 of 16 Old 11-22-2019, 12:26 AM
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october 1986 Popular Mechanics put it thus:
Attached Thumbnails
write up 40 popular mechanics 1986.jpg  
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post #15 of 16 Old 11-22-2019, 12:28 AM
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That explains the pre-cured sealer gasket, AMC had developed it and must have been rubbing their hands with glee at not having to pay $45 for a gasket anymore. if only Jeepforum had existed in 1986......
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