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  #1  
Old May 29th, 2011, 09:42
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ParadiseXJ ParadiseXJ is offline
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Eliminating the "tick, tick, tick"

My 88 MJ has a tick, especially when cold, but it doesn't go away completely. I've put the stethoscope on the valve cover, nothing. It has a slight exhaust leak (proven when I seafoamed it) towards the rear of the engine. I stethoscoped the manifold, all the front components are new cause I've revamped the thing (water pump, alternator, A/C compressor, P/S pump, harmonic balancer).

So my question is: I know the AW4 has flexplate bolts that can work loose and cause a tick, but is the same with a 5 speed? Can the flywheel bolts work loose and cause the same tick?

OR

would the exhaust leak increase or decrease the tick
as it warms up?

Like I said I've run the stethoscope all around the engine bay, top end, oil pan, sides of block and cannot isolate the ticking. I've also changed the oil twice, seafoamed, MMO the first change to clean things out, Lucas oil stabilizer the second change. No difference in ticking.

When it's at operating temp the tick is less pronounced but still there at idle. When I'm reving or running the tick SEEMS to go away, but I know the ticks just get closer together and blend in with the engine roar. It doesn't seem to affect the performance of the engine, still runs very strong without any stuttering, backfiring etc.
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  #2  
Old May 29th, 2011, 09:53
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Re: Eliminating the "tick, tick, tick"

The injectors make a tick noise
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  #3  
Old May 29th, 2011, 10:05
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Re: Eliminating the "tick, tick, tick"

I can hear the ticking from the injectors with the stethoscope and they're much faster than the ticking I can hear with the "naked ear". Like a hummingbirds heartbeat.

Like t-t-t-t-t-t-t-t-....as opposed to tik-tik-tik-tik.

Unfortunately it sounds like the ticking purge cannister like newer models, but I don't have a newer model.
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  #4  
Old May 30th, 2011, 05:33
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Re: Eliminating the "tick, tick, tick"

Sure you're not hearing piston slap til the pistons warm up and expand? My 90 Comanche does this. 4.0s are notorious for piston slap.
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  #5  
Old May 30th, 2011, 06:44
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Re: Eliminating the "tick, tick, tick"

Quote:
Originally Posted by cruiser54 View Post
Sure you're not hearing piston slap til the pistons warm up and expand? My 90 Comanche does this. 4.0s are notorious for piston slap.
I could be. Anything's possible at this point I suppose. Is there anything that can be done to get rid of, or minimize it short of pulling the mill?
It's more annoying than anything else and I worry that I might be doing it harm to run it.

Oil's in good shape, WIX filter, top end is clean as a whistle.
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  #6  
Old May 30th, 2011, 14:14
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Re: Eliminating the "tick, tick, tick"

I had that problem for years with my 87, 4.0, and tried everything. 5-90 gave me a clue one day that worked. It seemed my lifters were sticking. Running the engine at no load up to 3500 to 4000 rpm for 1-2 minutes freed up the lifters, and the noise went away. Had to repeat the step several times, especially after cold morning starts, but the noise is pretty much 99% gone now, and stayed gone the last 15,000 miles. Now at 278,000 miles.

Something about the 4.0 needing to get up over 3000 rpm periodically to un-stick the lifters, and get them rotating again.

Worked on my 89 last winter also when it decided to start ticking. It only has about 120,000 miles on it, and a new head.
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34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091

Last edited by Ecomike; May 30th, 2011 at 14:18.
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  #7  
Old May 30th, 2011, 15:05
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Re: Eliminating the "tick, tick, tick"

I'll give that a shot, I was considering seafoaming again.

This truck did sit for almost 2 yrs.
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  #8  
Old May 30th, 2011, 15:17
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Re: Eliminating the "tick, tick, tick"

Mine went for years with out ever getting over 2400 rpm, from 2004 when I bought it, till about 2008. And who knows about the prior 224,000 miles before I got it. There were times when it was so bad, I was sure it was going to throw a rod. I had already tried years of snake oil tricks......Now it just purrs!
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Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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  #9  
Old May 30th, 2011, 16:38
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Re: Eliminating the "tick, tick, tick"

My Jeep has been running rough for several years. Purchased some BG44K recently after using it successfully on my Discovery 2, threw it in with 1/4 tank. Now it runs very quiet. Got it for $12 a can on e-bay. Its worth a try.
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  #10  
Old May 30th, 2011, 16:43
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Re: Eliminating the "tick, tick, tick"

44K is great stuff.
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  #11  
Old May 30th, 2011, 17:10
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Re: Eliminating the "tick, tick, tick"

Running rough is not the same as running smooth with a tick tick tick valve clatter sound.

My was so bad on cold morning starts it sounding like a hammer striking the valve cover 1-2 times a second.

BG44K is good for cleaning fuel injectors!
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Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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  #12  
Old May 30th, 2011, 18:04
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Re: Eliminating the "tick, tick, tick"

And 44K is good for cleaning carbon deposits from the combustion chambers and tops of pistons.
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  #13  
Old May 30th, 2011, 18:17
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Re: Eliminating the "tick, tick, tick"

check your header for a crack... mine is cracked and makes a ticking sound...
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  #14  
Old May 30th, 2011, 18:31
alek21 alek21 is offline
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Re: Eliminating the "tick, tick, tick"

harmonic balancer? mine would tick on and off. it was rubbing against the oil pan.
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  #15  
Old June 3rd, 2011, 05:30
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Re: Eliminating the "tick, tick, tick"

Quote:
Originally Posted by Ecomike View Post
I had that problem for years with my 87, 4.0, and tried everything. 5-90 gave me a clue one day that worked. It seemed my lifters were sticking. Running the engine at no load up to 3500 to 4000 rpm for 1-2 minutes freed up the lifters, and the noise went away. Had to repeat the step several times, especially after cold morning starts, but the noise is pretty much 99% gone now, and stayed gone the last 15,000 miles. Now at 278,000 miles.

Something about the 4.0 needing to get up over 3000 rpm periodically to un-stick the lifters, and get them rotating again.

Worked on my 89 last winter also when it decided to start ticking. It only has about 120,000 miles on it, and a new head.
My 90 MJ has had a cyclical lifter click at idle and I've tried all the snake oil treatments but nothing worked. Yesterday I tried 5-90's suggestion and it was gone after the 3 minutes at 3750 RPM. I'll keep you posted as time goes on.

BTW Mike, you never went over 2400 RPM for that long of time?
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