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Unread 07-10-2013, 10:03 AM   #1
1987Jeep
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YJ Advice Needed

Hello all. I purchased a 1987 Jeep YJ that is a project vehicle. The Jeep has a Peugot transmission and the engine that is supposed to be in this Jeep is a 4.2L; Well the engine that is in the Jeep is 4.0L without an Intake or Exhaust manifold, the wiring harness was cut off at the firewall and it has no radiator.

Now my question to you is if you purchased this Jeep with intentions of only spending about $1000 for repairs what would you do?
There are so many options but I am not sure if I should look for a 4.2L a wiring harness and a radiator or If I should look at this as a long term project and just accept the fact that this project may cost more than $1000.
Your advise and expertise with Jeeps is greatly appreciated.

Thank you!

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Unread 07-10-2013, 10:15 AM   #2
superj
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there is a very minimal harness on an 87 so you could wire it yourself, easily using a diagram from an old cj
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Unread 07-10-2013, 11:06 AM   #3
roadyrob
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first thing I would do is a compression test to find out the condition of the engine, also check the transmission, if they changed the motor it may be an ax15. when know what you have make your decision.
like superj said you can keep it simple, a 4.2 intake will fit with a little work. a hei ignition only needs a hot wire to run, the 4.2 alternator is simple and selfcontained, very easy to wire up. you will need an electric fuel pump.
on the other hand you can get most of the parts you need for fuel injection from a cherokee in a junk yard.
your choice on which way to go.
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Unread 07-10-2013, 11:26 AM   #4
1987Jeep
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It is a Peugot BA10. I found a stock intake and exhaust manifold with a carb for $100. Would installing the HEI distributor eliminate the need for a new wiring harness? I was looking at maybe installing an E-Z wiring kit to make it simple but I am still hesitant to spend any money until I know all that is needed to make this motor work.
The motor has compression.
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Unread 07-10-2013, 11:55 AM   #5
roadyrob
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the 4.2 intake will work, you will need a 4.0 exhaust manifold.
there are numerous threads on th 4.0 head swap with a carb, pretty much the same thing as far as mounting everything.
heres one.
http://www.jeepforum.com/forum/f8/an...d-carb-153635/

the only wires needed for a hei distributor are a switched hot wire and a wire for the tach, at the firewall connector the hot wire is a larger yellow wire, the tach is green with a black stripe. you said the harness was cut at the firewall connector so I assume its intact inside the jeep. you will still need a simple harness for the alternator, starting circuit, gauges and lights.
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Unread 07-10-2013, 12:27 PM   #6
1987Jeep
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Thank you I appreciate it.
The casting number on the head is 8933002 when I googled it it shows to be a 4.2l head off of an 86 258. The engine block casting number is 53005535 and that apears to have come from a 1987-90 4.0L.

So the head is from a 1986 4.2 on a 87-90 4.0L block what a mess. So now should I purchase that manifolds and carb for the 4.2L for $100? Is there any wiring required for the stock carb on a 4.2L
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Unread 07-10-2013, 12:36 PM   #7
Siva283
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Quote:
Originally Posted by 1987Jeep View Post
Thank you I appreciate it.
The casting number on the head is 8933002 when I googled it it shows to be a 4.2l head off of an 86 258. The engine block casting number is 53005535 and that apears to have come from a 1987-90 4.0L.

So the head is from a 1986 4.2 on a 87-90 4.0L block what a mess. So now should I purchase that manifolds and carb for the 4.2L for $100? Is there any wiring required for the stock carb on a 4.2L
87 - 90 jeeps were a 4.2. 4.0 didn't start until 91

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Unread 07-10-2013, 12:49 PM   #8
1987Jeep
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The block is stamped 4.0 on the passenger side and when I googled the casting number on it 53005535 it says it is a 1987-90 Jeep block is it possible it came out of a Cherokee?
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Unread 07-10-2013, 01:19 PM   #9
roadyrob
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could possibly be from a cherokee. look on the passenger side of the block towards the bottom in front of the oil filter if theres a hole its for the fuel pump and its a 4.2. also, you don't want to run a stock carb, its computer controled, look into a motorcraft, weber or holley.
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Unread 07-10-2013, 01:43 PM   #10
1987Jeep
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No hole for a mechanical fuel pump. Would a Motorcraft carb bolt right up?
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Unread 07-10-2013, 02:04 PM   #11
rambo3489
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You my friend are in for the LONG haul. And it will cost you more than $1000. TRUST me. Do yourself a favor and do things right from the start. Don't halfass it.
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Unread 07-10-2013, 02:06 PM   #12
rambo3489
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Quote:
Originally Posted by 1987Jeep View Post
No hole for a mechanical fuel pump. Would a Motorcraft carb bolt right up?
You will need a plate for it to bolt up to the 4.2 intake manifold. I think I have one I could send you if you'd like? It's a great carb.
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89 YJ.. My first jeep and I won't let it go. ▀||||▀

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[URL="http://www.jeepforum.com/forum/f22/my-yj-build-adventures-thread-1356941/"][SIZE="3"][B]BUILDING THE YJ MY WAY[/B][/SIZE][/URL]
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Unread 07-10-2013, 02:22 PM   #13
roadyrob
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the motorcraft carb requires an adapter and some work on the linkage. heres a thread with a few links.http://www.jeepforum.com/forum/f8/ho...ester-1068648/
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Unread 07-10-2013, 02:39 PM   #14
1987Jeep
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rambo3489 what would you do if you were in my position? roadyrob that thread is very helpful thank you.
I think I may eventually rip out the engine, trans, and transfer case and upgrade like many other have done on this forum; but for right now i would just like to get this thing running as is if possible. I just dont want to spend to much money right now than just get rid of it all.
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Unread 07-10-2013, 02:46 PM   #15
1987Jeep
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Do you guys know where I can find or what type of vehicle the Motorcraft carb came on from the factory?
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