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Unread 04-03-2002, 07:28 PM   #1
Plink
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What is the difference between a '87 258 and a '86 258

It seems like my 87 has a 86 258 in it. Can anyone tell me the difference between the two? Thanks

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[FONT=tahoma][SIZE=3][COLOR=black][B]87 YJ 4.2[/B][/COLOR][/SIZE][/FONT]
[B]2" BL, 2" Shackle, 1.5" Black Diamond and Junk[/B]
[B]31 MTRs on MOABs[/B]
[B]Need new front and rear bumpers[/B]
[B]HAM: KB3JQS[/B]
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Unread 04-03-2002, 07:57 PM   #2
johny1i
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One easy way may be the valve cover--I know a lot of CJ's (if not all) came with plastic ones. My 1990 came with an aluminum one, a revision that I believe began with the 1987 Wrangler. Also, that CJ valve cover only has approximately 7 bolts that hold it on while mine has about twice that many.
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Unread 04-04-2002, 06:02 AM   #3
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Thanks I'll take a look today.
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[FONT=tahoma][SIZE=3][COLOR=black][B]87 YJ 4.2[/B][/COLOR][/SIZE][/FONT]
[B]2" BL, 2" Shackle, 1.5" Black Diamond and Junk[/B]
[B]31 MTRs on MOABs[/B]
[B]Need new front and rear bumpers[/B]
[B]HAM: KB3JQS[/B]
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Unread 04-04-2002, 06:56 AM   #4
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I looked and there were definetly more then 7 bolts. The reason I'm asking is because I got an 87 and it was much wider and the threads don't match the one I took off. I bought a 86 CJ 258 oil filter and it worked. I just want to make sure I buy the right parts for my Jeep. If the oil filters are that different then I really need to make sure.
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[FONT=tahoma][SIZE=3][COLOR=black][B]87 YJ 4.2[/B][/COLOR][/SIZE][/FONT]
[B]2" BL, 2" Shackle, 1.5" Black Diamond and Junk[/B]
[B]31 MTRs on MOABs[/B]
[B]Need new front and rear bumpers[/B]
[B]HAM: KB3JQS[/B]
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Unread 04-04-2002, 09:48 AM   #5
johny1i
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Try to get some input from someone with an '87. Something must be up for it to have that oil filter situation, and my valve cover suggestion was very non-technical. My brother has an '85, so I can only compare that to my '90.
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Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
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Unread 04-04-2002, 11:23 AM   #6
4wheeler4CJ
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The basic engine block should be the same. I don't know what minor changes there could be. I would imagine that the oil filter is the same. Most changes over the years occurred on the top ends (intake/exhaust/aircleaner/vbalve cover, etc.)

If you can get the engine ID #, you can cross-check it with a service manual to find the year, etc.

I suspect you have an '87 motor, and they gave you the wrong part. <img border="0" title="" alt="[Wink]" src="wink.gif" />
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Unread 04-04-2002, 11:23 AM   #7
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Roger that! With people swapping heads and blocks no telling what you're going to get. I bought my YJ for $50 and a case of Sam Adams! For that price I'll take just about anything!
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[FONT=tahoma][SIZE=3][COLOR=black][B]87 YJ 4.2[/B][/COLOR][/SIZE][/FONT]
[B]2" BL, 2" Shackle, 1.5" Black Diamond and Junk[/B]
[B]31 MTRs on MOABs[/B]
[B]Need new front and rear bumpers[/B]
[B]HAM: KB3JQS[/B]
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Unread 04-04-2002, 12:31 PM   #8
4wheeler4CJ
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Good frickin deal! Gotta love a deal like that!
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Unread 04-04-2002, 12:59 PM   #9
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Hey 4wheeler4CJ do you have the crank pulley off the 258??? The one I have is eating fan belts.
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[FONT=tahoma][SIZE=3][COLOR=black][B]87 YJ 4.2[/B][/COLOR][/SIZE][/FONT]
[B]2" BL, 2" Shackle, 1.5" Black Diamond and Junk[/B]
[B]31 MTRs on MOABs[/B]
[B]Need new front and rear bumpers[/B]
[B]HAM: KB3JQS[/B]
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Unread 04-04-2002, 01:47 PM   #10
4wheel4fun
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It really depends on when your 87 was manufactured. My 87 was actually built in late 86' for the 87' year, so it came with a plastic valve cover. The engine core is really the same. The critical changes came in the trans and Tcase.
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Unread 04-04-2002, 02:03 PM   #11
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Mine has the Aluminum valve cover. I found some vacuum leaks this morning. I replaced the old hose and my idle is around 800rpm. It sounds pretty good but it still coughs alittle. I'm hopeing that will stop when the year old gas runs out! I mixed in some 97 oct. Anyone have any tips on cheap engine mods and lifts. I'm thinking about doing a 2" block lift. I have no idea kind of lift I should do. I don't plan on doing heavy off roading but would like to do a little bit this summer. Thanks
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[FONT=tahoma][SIZE=3][COLOR=black][B]87 YJ 4.2[/B][/COLOR][/SIZE][/FONT]
[B]2" BL, 2" Shackle, 1.5" Black Diamond and Junk[/B]
[B]31 MTRs on MOABs[/B]
[B]Need new front and rear bumpers[/B]
[B]HAM: KB3JQS[/B]
Plink is offline   Reply With Quote Quick reply to this message
Unread 04-05-2002, 07:55 AM   #12
4wheeler4CJ
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I have a '76 232 Block (same as the 258), I'll have to look to see if I still have the pulley, I'm almost positive, I have every part for the complete engine, I disassembled it when i took it out of the Jeep, so i could sell the components (engine wasn't running when I bought the Jeep, had sat a while). Email me to remind me to look, LOL ericnmish@yahoo.com <img border="0" title="" alt="[Wink]" src="wink.gif" />
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Unread 04-05-2002, 02:44 PM   #13
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Already did....let me know.
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[FONT=tahoma][SIZE=3][COLOR=black][B]87 YJ 4.2[/B][/COLOR][/SIZE][/FONT]
[B]2" BL, 2" Shackle, 1.5" Black Diamond and Junk[/B]
[B]31 MTRs on MOABs[/B]
[B]Need new front and rear bumpers[/B]
[B]HAM: KB3JQS[/B]
Plink is offline   Reply With Quote Quick reply to this message
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