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Unread 12-03-2009, 05:09 AM   #1
Thunder Head
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1989 YJ Wrangler 
 
Join Date: Apr 2007
Location: Georgia
Posts: 6
My 1989 4 banger just blew up (pic added)

Hey guys,
My jeep lost power and quit on the way to work the other day. Pulled out the spark plugs to make sure i ws getting fire. They looked pretty bad so i put a new set of plugs and wires on. While trying to start the engine my vavle cover exploded into several pieces. I am assuming this means i have cylinder problems and the back pressure caused this. I am not a mechanical genius so i am not real sure. What do yall think?

Also, keeping in mind i dont know alot about engines. How hard is it to replace my 4 cyl. with a 6cyl.


Last edited by Thunder Head; 12-04-2009 at 08:07 AM..
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Unread 12-03-2009, 05:14 AM   #2
rompinthewoods
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1995 YJ Wrangler 
 
Join Date: Aug 2008
Location: Hendersonville, TN
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It is difficult to do for someone that knows about engines. From what you posted above, I would part it out and buy one with the 6 cyl or pay a mechanic to do it. But then again, it may be a good learning experience. I would use the search function on the homepage and find someone that has done it. Look at their process and see if it's something you can tackle.
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Unread 12-03-2009, 10:00 AM   #3
jeepnmike
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1999 TJ Wrangler 
 
Join Date: Aug 2006
Location: Gainesville/Radford VA
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Just swap in another 4 banger. It will be A LOT easier and cheaper.
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Unread 12-03-2009, 01:18 PM   #4
Thunder Head
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1989 YJ Wrangler 
 
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Location: Georgia
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Whats my best option for a new motor?
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Unread 12-03-2009, 01:33 PM   #5
jeepnmike
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Quote:
Originally Posted by Thunder Head View Post
Whats my best option for a new motor?
As far as a reman'd 4 banger?? I don't know much about remans but I haven't heard a lot of bad stuff about Jaspers.
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'95 YJ- 1.25" BL, 31" bfg's, black cragars, herc'd tub. sold
'99 TJ Sport- 35's, 8.8, 4.88s, 5" RC LA, JB SS SYE, UFC TT, HD steering
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Unread 12-03-2009, 02:01 PM   #6
oteps
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1980 CJ5 
 
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I have a jasper engine and tranny in my truck, 140,000 miles on the engine 120,000 on the tranny. And its a dodge auto with a lot of towing. I am starting to have some problems with the tranny now.
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Unread 12-04-2009, 08:06 AM   #7
Thunder Head
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Location: Georgia
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Any idea how the valve cover blew up?

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Unread 12-04-2009, 08:42 AM   #8
1998zj
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1995 YJ Wrangler 
 
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Wow that engine has been neglected during its miserable life.
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Unread 12-04-2009, 09:18 AM   #9
WJ-matt
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Location: Cape Cod
Posts: 320
the only thing i can come up with is a cloged pcv valve or an actual lifter/valve stuck and the presure just kept on building untill the valve cover blew up. How long have you had this jeep, and what kind of serveces have you done too it ? only reason i ask is the oil looks like sludge in thier. When was the last oil change done? and who did it?
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Unread 12-04-2009, 01:07 PM   #10
Thunder Head
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1989 YJ Wrangler 
 
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Location: Georgia
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I have put about 30 thousand miles on it since i got it. Its was up to 169,000. I was surprised at how dirty it was under the cover too. I service all my vehicles at around 3,000 miles. I replaced the pvc valve 6-7,000 miles ago because it was stopped up.

I havent done anything to the outside of the engine because i havent got there yet. It usless to clean it. Too much oil coming out around PVC valve. Kinda been waiting on it to die. It had a compresion problem in the #2 cylinder already.
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Unread 12-06-2009, 10:35 AM   #11
Geardo
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1998 ZJ 
 
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That is one nasty engine
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Unread 12-06-2009, 04:25 PM   #12
buzziegee
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1990 YJ Wrangler 
 
Join Date: Nov 2009
Location: Hespeler
Posts: 46
Fuel in the crankcase,,little spark,,,big boom,,god-damn dirty motor...remans are all good, used to build them myself ,,just not for Jasper..go to a local Automotive Machine shop and get some advice on your options...Buzziegee
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