sounds like a fricken deisel now
11-18-2010 | 12:11 PM
#16
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 17
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
Hi.
I have a '93 xj, 4.0 engine and I had the exact same problem. When I first got it, it had a little bit of lifter ticking, but nothing major. When I changed the oil, I used what I use in my full-size 1990 Dodge truck; 3 quarts 10-w30 and 2 quarts 20-w50 (I know it sounds wierd, but hey, the truck is 20+ years old and the engine still runs strong with no oil burning, so I must've been doing something right.)
Anyway, I did the same thing to my xj and the engine started sounding like a diesel and got so bad, even my buddy, an ASE master mechanic, was convinced I had a serious rod knock. After agonizing over needing a new engine, I came across a post that suggested just using the called for 10-w30 oil. I changed the oil to the 10-w30 and believe it or not, all the scary noises gradually went away (took about 3 weeks). That was 2 years ago,and it still runs quiet. Hope this helps.
I have a '93 xj, 4.0 engine and I had the exact same problem. When I first got it, it had a little bit of lifter ticking, but nothing major. When I changed the oil, I used what I use in my full-size 1990 Dodge truck; 3 quarts 10-w30 and 2 quarts 20-w50 (I know it sounds wierd, but hey, the truck is 20+ years old and the engine still runs strong with no oil burning, so I must've been doing something right.)
Anyway, I did the same thing to my xj and the engine started sounding like a diesel and got so bad, even my buddy, an ASE master mechanic, was convinced I had a serious rod knock. After agonizing over needing a new engine, I came across a post that suggested just using the called for 10-w30 oil. I changed the oil to the 10-w30 and believe it or not, all the scary noises gradually went away (took about 3 weeks). That was 2 years ago,and it still runs quiet. Hope this helps.
A more viscous oil also does not "help" the engine out if it's older or if it is knocking. The reason a thicker oil quiets knocking is because it doesn't transmit the SOUND of the knocking as much as a lighter weight oil does, and definitely does not make the problem go away - it could even make it worse.
11-18-2010 | 06:40 PM
#17
Thread Starter
Senior Member
Joined: Aug 2009
Posts: 724
Likes: 1
From: B-town sc
Year: 1989
Model: Cherokee
Engine: 4.0
Have you considered other possiblities rather than the type of oil he used. I put 10-40 in mine and it doesnt sound like a deisel. No extra additives like lucas, etc.
Could be a exhaust leak, one small enough would sound like a deisel. Does it sound like valves? Hows the oil pressure? Does the sound go up with the rpms ? Ask questions before you figure you know it all, and say hey you used the wrong oil.
The man clearly states that he does the same on EVERY jeep in his family and this has never happened.
Could be a exhaust leak, one small enough would sound like a deisel. Does it sound like valves? Hows the oil pressure? Does the sound go up with the rpms ? Ask questions before you figure you know it all, and say hey you used the wrong oil.
The man clearly states that he does the same on EVERY jeep in his family and this has never happened.
11-18-2010 | 07:14 PM
#18
Seasoned Member
Joined: Jun 2010
Posts: 352
Likes: 0
Model: Cherokee
I had the same thing happen to a 88 XJ that i used to own, with a mix of 5 quarts 15w-40 and 1 quart Lucas Petro Oil Stabilizer. I immediately drained those 6 quarts and refilled the sump with 10w-30, just like you guys say, and the noises went away. She had a little over 200,000 very hard and abused miles on her at the time, and the same motor is still going strong with over 250,000 miles on her now in my buddies possesion.
11-18-2010 | 07:43 PM
#19
CF Veteran
Joined: Jan 2010
Posts: 1,506
Likes: 2
From: WI
Year: '99
Model: Cherokee
Engine: 4.o
Within a month if the PO had put gear lube in it it would have blown up by now!!! I guarantee it. What brand and kind of oil and filter are you now running. I had the same issue running Q-horsepower and a K&N oil filter. switched to Mobil 1 and wicks filter and never looked back. And it was a lot cheaper then a new motor!!!!!!!!!!!
11-18-2010 | 07:47 PM
#20
Thread Starter
Senior Member
Joined: Aug 2009
Posts: 724
Likes: 1
From: B-town sc
Year: 1989
Model: Cherokee
Engine: 4.0
Within a month if the PO had put gear lube in it it would have blown up by now!!! I guarantee it. What brand and kind of oil and filter are you now running. I had the same issue running Q-horsepower and a K&N oil filter. switched to Mobil 1 and wicks filter and never looked back. And it was a lot cheaper then a new motor!!!!!!!!!!!
11-18-2010 | 07:57 PM
#21
CF Veteran
Joined: Jan 2010
Posts: 1,506
Likes: 2
From: WI
Year: '99
Model: Cherokee
Engine: 4.o
GET RID OF THAT FILTER!!!!!!!!!!!!!!!! I thought the same thing. They make good air filters I bet they make good oil filters. No my only guess as to why i had my issues is to the fact of Q-horsepower spent more on adds then on product. And a company that makes air filters has no right to make a oil filter unless they have a vary long record of success. Oil filters have a bypass valve that if not working can starve the top of the motor for oil and make a tick or even a knock. And if not corrected can cause serious issues. That's why I run wixx. They have been around a long time and know there stuff same with Mobil. There are other brands out there that are good. But for me if it hasn't been time tested and proven. I don't want it. That's why I drive and XJ!!!!
11-18-2010 | 07:58 PM
#22
Senior Member
Joined: Mar 2010
Posts: 718
Likes: 0
From: Miami,Fl
Year: 1998
Model: Cherokee
Engine: 4.0 L6 Srt
could the K&N filter possibly be restricting flow?? I was looking into getting a couple and now that i see that both of you guys used it and seem to of had this problem, im debating whether or not to get them now..
Sorry to thread jack.
v v vv Kool, Thanks vv v v
Sorry to thread jack.
v v vv Kool, Thanks vv v v
Last edited by 98jeepsrt6; 11-18-2010 at 08:09 PM.
11-18-2010 | 08:04 PM
#23
Thread Starter
Senior Member
Joined: Aug 2009
Posts: 724
Likes: 1
From: B-town sc
Year: 1989
Model: Cherokee
Engine: 4.0
its kool. ad i dont think soo iv never had a problem with k&n filters before
11-18-2010 | 08:25 PM
#24
CF Veteran
Joined: May 2010
Posts: 3,405
Likes: 2
From: Fort Collins, CO
Year: 1996
Engine: 4.0L HO
Everyone in my family swears by Napa gold filters. Only like 5 bucks and they are some of the best. We also use Carquest store brand oil, because all it is is debranded Valvoline. Great stuff, no additives or anything, except a can of seafoam a few hundred miles before a change to get all the sludge and crap out.
11-18-2010 | 09:23 PM
#26
CF Veteran
Joined: Nov 2008
Posts: 2,003
Likes: 4
Year: 1987
Model: Cherokee
Engine: 4.0
Within a month if the PO had put gear lube in it it would have blown up by now!!! I guarantee it. What brand and kind of oil and filter are you now running. I had the same issue running Q-horsepower and a K&N oil filter. switched to Mobil 1 and wicks filter and never looked back. And it was a lot cheaper then a new motor!!!!!!!!!!!
thing ran damn strong...but that was most definitely gear lube in it. crank, bearings, lifters, and cam are all shot.
11-21-2010 | 04:52 PM
#27
Newbie
Joined: Nov 2010
Posts: 5
Likes: 0
From: Wadsworth,IL
Year: 1997
Model: Cherokee
Engine: 4.0
ok, so i got this 91 xj 4.0 about a month ago. engine had a lil noise to it but so do all the other jeep my family has. So i changed the oil in it last night, did the usual like in i do in all the other jeeps 10w-40 with a bottle of lucas. Ever since i did that the noise has gotten worse! what is it?
01-07-2011 | 06:43 PM
#29
Thread Starter
Senior Member
Joined: Aug 2009
Posts: 724
Likes: 1
From: B-town sc
Year: 1989
Model: Cherokee
Engine: 4.0
Well, i found the problem. i guess it was just a coincidence it started after my oil change, but today i pulled the dust cover on the tranny and surenuff loose bolt's. so i tightend them the best i could ( i was running out of time and i was pissed) started her and no more diesel clunk. 
01-07-2011 | 06:55 PM
#30
Seasoned Member
Joined: Dec 2010
Posts: 283
Likes: 0
From: Davison, MI
Year: 1988
Model: Cherokee
Engine: 4.0
I personally use royal purple 10w30, for the engine and royal purple trans fluid and gear oil for every thing else. When I got my 88 i paid 300 for it and it knocked like hell. I had a motor ready and figured i'd try the RP 10w30 for kicks. 293,000+ miles on the 88 with that motor that was knocking. NEVER use additives. it's like putting a bandaid on a broken leg. The 88 is still running strong closin in on 300,000.
Last edited by thundaluvin; 01-07-2011 at 06:57 PM. Reason: adding more to story.