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Old 06-14-2018, 02:46 PM
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Amazing New Found Power For My 2.5

Some of you have noted my dissatisfaction with the lack of power from my 2.5 YJ running 33s. I was tired of literally having to keep my right foot placed firmly on the floor just to try to maintain any respectable speed especially going up any sort of incline. I had resigned myself to the fact that a gear change was the only means to alleviate this misery. However, a slapping noise in my engine prompted me to replace the timing chain and gears in my engine. Upon disassembly, I noticed that the chain had stretched to the point that the cam gear mark was a full tooth's distance retarded from the crank gear mark. After I installed all new components, chains, gears, tensioner, etc. the results are nothing less than AMAZING. All shift points are lower, the torque gain is phenomenal, and I can even use 5th gear now! It's like driving a totally different Jeep now! I just wanted to share. My engine has 131,000 miles and, by the way, still has the slapping noise, I figure its piston slap. Anyways, I'm sure glad I put in all new timing components.

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Old 06-14-2018, 03:01 PM   #2
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Definitely need to do this with my 4.0

Im pushing 250k miles, due for a rebuild.

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Old 06-14-2018, 03:33 PM   #3
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I just did the chain on my 4.0 and it did seem to help on the low end it seems to pull stronger right off idle and it definitely runs better.
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Old 06-14-2018, 04:28 PM   #4
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I've stated on this forum in the past...."The timing chain is the most overlooked repair during complaints of a vehicle not running well".

My experience mirrors Krangler87s.

Good Luck, L.M.
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Old 06-14-2018, 05:05 PM   #5
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Ordered a new timing chain from Quadratec. Looking forward to some noticeable results if any at all. New parts always make me feel special though.
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Old 06-15-2018, 10:54 AM   #6
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With 224k miles on the clock, I thought about swapping out the timing chain in my YJ. But the thing runs great, burns zero oil, and is as quiet as a 4.0l can get. I'm undecided. Perhaps when I have nothing else left to do to it.

Glad you found your problem though OP!
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Old 06-15-2018, 01:37 PM
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My wife drove it yesterday for the first time after the repairs. She was like, 'what have you done to this thing?' She absolutely hated driving it due to stalling and downshifting, but now she loves it! It starts faster, idles better, doesn't act like its flooding all of the time, the exhaust is much cleaner, and the power restored is miraculous.
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Old 06-18-2018, 11:58 AM   #8
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I think I need to do a timing chain as well at 160k on my 4.0. Has anyone done a mild performance cam at the same time?
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Old 07-28-2018, 07:00 PM   #9
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How involved is this job? I ordered the timing kit which includes sprockets, chain, tensioner, some other rubber thing that I don't know what it is and gaskets. I ordered a pulley removal tool from harbor Freight. I'm pretty handy with tools and I've done all the work on my YJ but I have never done a timing chain. I got quoted $350 for labor. I'm thinking about doing it myself but I want to make sure there isn't some sorcery involved. YouTube was no help. Couldn't find anything as far as step by step instructions. Anyone knows where I can get a tutorial?
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Old 07-29-2018, 01:55 AM   #10
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A Chiltons manual has the basic instructions. A Factory Service Manual is somewhat more detailed, but states that you need a special factory tool. The Chiltons manual tells you how to do the job without the factory tool.
The FSM doesn't tell about the pulley sleeve which is usually necessary due to a wear groove in the vibration dampener.

Pic 3 is the sleeve in the process of being fitted to the vibration dampener (also called a crank pulley).

Good Luck, L.M.
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"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 07-29-2018, 09:14 AM   #11
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Thanks for the reply. Today I'm going to Autozone or O'Reillys to see if I find the manual. If not I will order it online. Also will check on finding the sleeve.
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Old 07-29-2018, 10:23 AM   #12
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The sleeve should come as part of the timing chain kit. Make sure you clean the shaft of the vibration dampener well prior to attempting to install the sleeve.


Good Luck, L.M.
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"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 07-29-2018, 10:31 AM   #13
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Will do, thanks.
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Old 07-29-2018, 08:11 PM   #14
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I just did the timing chain on my 1992 2.5. It is not hard but you must be extremely precise on alignment of the timing marks. Make sure you are at TDC on number 1 and that it does not move.

I have the 1994 FSM as a PDF. PM me and I'll send it to you tomorrow.

They only special tool I needed was a pulley pullet to get the harmonic balancer off. An impact wrench is super helpful but not critical.

Also, Alldatadiy.com is an inexpensive service manual. $15 per year per vehicle.

Sent from my SM-G930U using Tapatalk
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Old 07-30-2018, 11:43 AM
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If you're a decent mechanic, you can do it. I think you indicated that it's currently running well, so there are no problems going in. There's no magic involved. You DO NOT
>>Pull any spark plugs
>>Remove any distributor components
>>Have to line any marks up anywhere, EXCEPT the marks cast/stamped into the gears

Just imagine a straight line from the center of the cam to the center of the crank and make SURE the timing marks on each gear align along this line (pointing toward each other). Use a yardstick or some other straight edge t make sure. That is it. Hardest part is cleaning up all parts and putting the timing cover back on and ensuring a good seal at all of the critical points.
Good Luck........ keep us posted
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Old 07-30-2018, 03:21 PM   #16
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PM sent. Having issues sending messages or posting. Seems like the site is having technical issues. Thanks for the replies.

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