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Unread 03-17-2011, 06:27 PM   #1
98muddyjeep
rockin lil red wagon
 
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1998 XJ Cherokee 
 
Join Date: Jun 2008
Location: Hatboro PA
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gather around good friends..

I have some bad news to share,as of yesterday my jeep was diagnosed with a rod knock.While shes being brave and trying to keep upbeat I know shes hurt bad. I am hoping this weekend weather permitting I will be able to do some exploratory surgery and see how bad things are.Depending on my findings I may just get the crank ground and polished and go with oversized bearings,I cant hurt things anymore so well see what happens.If that fails I will be looking for a new motor,i have to much time invested in her to just let her go so wish me luck.

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Unread 03-17-2011, 06:40 PM   #2
xjfever
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1995 XJ Cherokee 
 
Join Date: Feb 2008
Location: north Ga.
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Good luck and hope it works out for you.
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  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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Unread 03-17-2011, 06:54 PM   #3
jeeptorino68
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1992 XJ Cherokee 
 
Join Date: Aug 2005
Location: Damascus/ Corvallis OR
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stroker...
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92 XJ 4.0 HO,AW4, NP242, 30" BFG AT, 1.75 spacer and ZJ coils, double cherokee leaf pack and 2 inch rough country shackles, 2.5 inch dnynomax exhaust, magnaflow cat, front hooks & rear hitch, gas skid, front skid, warn t-case skid, 99+ intake, bored TB

02 KJ Limited, 255 70 16s, front skid, LS/373 gears
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Unread 03-17-2011, 07:03 PM   #4
98muddyjeep
rockin lil red wagon
 
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1998 XJ Cherokee 
 
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Location: Hatboro PA
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yea after 9 years and 138,000 miles(she already had 60,000 on her when i got her)she finally went,Im just kinda sad she didnt see 200,000 miles, I havent done anything to the motor other than oil changes, tune ups, belts a waterpump and alternator.I though about a stroker but with gas threatning to hit 5 bucks a gallon im not looking forward to using premium,but well see that could change real fast.
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Unread 03-17-2011, 07:04 PM   #5
warbuk
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1995 ZJ 
 
Join Date: Feb 2009
Location: Greenwood SC
Posts: 88
that sux, check on a long block assembly.
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Unread 03-17-2011, 07:42 PM   #6
meadz
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I feel your pain my motor just blew last week..
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Unread 03-17-2011, 07:46 PM   #7
Crazystang89
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Keep the compression down to around 9.0:1 or lower and using regular pump gas wouldn't be a problem. Also, gas mileage tends to increase slightly in stroker engines due to more low end torque. If you are gonna rebuild it anyway, you might as well.
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Unread 03-17-2011, 07:54 PM   #8
Brookhart63
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1999 XJ Cherokee 
 
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Drop a hemi in it sorry about your engine. im pretty sure gas mileage should go up like posted above. The less load a engine has the better the mileage. example: girlfriends dad just bought a 1989 S10 with a 350 dropped in and it gets 27mpg. But the bracket only allow less than 1/3 throttle so it keeps the tires. Nothing is wrong with strokin it!
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Unread 03-17-2011, 10:06 PM   #9
Aero
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poor thing.. I got mine last month with 170k, and seeing all these makes me think I'm gonna' be crying sometime soon.
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Unread 03-18-2011, 04:48 AM   #10
husker88jeep
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1988 XJ Cherokee 
 
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i put a crate motor in mine last fall... cost me about 1500.00 but it was cheaper than buying a new XJ
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Unread 03-18-2011, 05:52 AM   #11
cruiser54
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For sure rod knock? What's the oil pressure?Is it auto trans? If so, check the flexplate to torque converter bolts. They back out a mimmick a rod knock.
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Unread 03-19-2011, 10:14 AM   #12
98muddyjeep
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1998 XJ Cherokee 
 
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im pretty sure its a rod knock wel maybe a spun bearing, I had to limp her home and if i worked the gas just right the noise would go away and come back when i let off the gas.Oil pressure has been great at just a hair above 40 psi while moving and 10-15 at idle.I am going out in a bit to start looking around,I would love to rebuild it as a stroker but money is a bit tight right now but i do have future plans for a stroker motor but this is my DD and i have no plans on getting rid of her I am almost done building her so way to much time and money invested to stop now.
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Unread 03-19-2011, 10:24 AM   #13
cruiser54
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If the rattle is when OFF the gas, it's way more likely to be the flexplate bolts. Bearing knocks are under load, not coast, and are accompanied by low oil pressure. If I were you, I would enthusiasticly be crawling under there to check the bolts on the flexplate to torque converter. If this is the problem, you must send me a gift certificate for one six-pack of Guinness Extra Stout.

Any questions on checking the bolts, post up. We'll help you through it..
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Unread 03-19-2011, 04:44 PM   #14
98muddyjeep
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well I just pulled the inspection cover and its not the flywheel bolts they were all tight,its also not a rod knock but I did find the skirt of piston # 2 in the oil pan.I can see the cylinder and it looks good, no scores just missing a chunck of the side I can see the rings but like i said the cylinder wall is ok not to sure what to do now theres not to many motors for sale in the area right now and cash is low so i may look into a new piston any thoughts on this idea? Thanks for all your suggestions.
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Unread 03-19-2011, 08:22 PM   #15
98muddyjeep
rockin lil red wagon
 
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1998 XJ Cherokee 
 
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after doing some looking I know its cheaping out but I found I can get a piston for 41 dollarsso what do you guys think good idea or giant fail?Keep in mind moneys tight right now and its only a temp fix for a few months.
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