Simon Juncal

Robert Goldpalm wrote:
> As pevious posted under: Hammering / knocking noise on 4.0L6 '99 Cherokee
> it seems, I am much closer to finding the source of the noise now.
> For the last hour, I have spent listening to the engine at idle,
> air-con and auxiliary fan off..
> No mistake, the noise is coming from the engine, around
> cylinder 5 or 6. The noise is also clearly audible around the
> left wheel house.
> It cycles on and off. It goes like: tick, tick, tick....increasingly
> loud for about 10-15 seconds, stops completely with a few
> seconds silence in between, and starts again. The cycle lengths
> are not completely even, with variations of within a few seconds.
> Some cycles are louder, some cycles softer, and sometimes, there
> is a longer brake in between the cycles.
>
> What could that be?
>
> Thanks again. I feel, I am much closer to solving this riddle now.

Lifter tapping, that cycling on and off thing, with it sometimes being
louder, sometimes softer; is a dead giveaway.

Simon Juncal

Robert Goldpalm wrote:
> As pevious posted under: Hammering / knocking noise on 4.0L6 '99 Cherokee
> it seems, I am much closer to finding the source of the noise now.
> For the last hour, I have spent listening to the engine at idle,
> air-con and auxiliary fan off..
> No mistake, the noise is coming from the engine, around
> cylinder 5 or 6. The noise is also clearly audible around the
> left wheel house.
> It cycles on and off. It goes like: tick, tick, tick....increasingly
> loud for about 10-15 seconds, stops completely with a few
> seconds silence in between, and starts again. The cycle lengths
> are not completely even, with variations of within a few seconds.
> Some cycles are louder, some cycles softer, and sometimes, there
> is a longer brake in between the cycles.
>
> What could that be?
>
> Thanks again. I feel, I am much closer to solving this riddle now.

Lifter tapping, that cycling on and off thing, with it sometimes being
louder, sometimes softer; is a dead giveaway.

Simon Juncal

Robert Goldpalm wrote:
> As pevious posted under: Hammering / knocking noise on 4.0L6 '99 Cherokee
> it seems, I am much closer to finding the source of the noise now.
> For the last hour, I have spent listening to the engine at idle,
> air-con and auxiliary fan off..
> No mistake, the noise is coming from the engine, around
> cylinder 5 or 6. The noise is also clearly audible around the
> left wheel house.
> It cycles on and off. It goes like: tick, tick, tick....increasingly
> loud for about 10-15 seconds, stops completely with a few
> seconds silence in between, and starts again. The cycle lengths
> are not completely even, with variations of within a few seconds.
> Some cycles are louder, some cycles softer, and sometimes, there
> is a longer brake in between the cycles.
>
> What could that be?
>
> Thanks again. I feel, I am much closer to solving this riddle now.

Lifter tapping, that cycling on and off thing, with it sometimes being
louder, sometimes softer; is a dead giveaway.

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

The horror of it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Nathan Otis wrote:
>
> I don't mean to insult yours, but he did say:
>
> > For the last hour, I have spent listening to the engine at idle,
> > air-con and auxiliary fan off..
>
> :-)
> n.

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

The horror of it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Nathan Otis wrote:
>
> I don't mean to insult yours, but he did say:
>
> > For the last hour, I have spent listening to the engine at idle,
> > air-con and auxiliary fan off..
>
> :-)
> n.

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

The horror of it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Nathan Otis wrote:
>
> I don't mean to insult yours, but he did say:
>
> > For the last hour, I have spent listening to the engine at idle,
> > air-con and auxiliary fan off..
>
> :-)
> n.

Robert Goldpalm

The diagnoses so far seem to be:

-lifter that is not staying pumped up
-Lifter tapping

I already did the "ATF in Engine Oil" trick without
success.

What to do? Anybody had an identical problem and
got rid of the ticking?

Robert Goldpalm

The diagnoses so far seem to be:

-lifter that is not staying pumped up
-Lifter tapping

I already did the "ATF in Engine Oil" trick without
success.

What to do? Anybody had an identical problem and
got rid of the ticking?

Robert Goldpalm

The diagnoses so far seem to be:

-lifter that is not staying pumped up
-Lifter tapping

I already did the "ATF in Engine Oil" trick without
success.

What to do? Anybody had an identical problem and
got rid of the ticking?

DougW

Robert Goldpalm did pass the time by typing:
> The diagnoses so far seem to be:
>
> -lifter that is not staying pumped up
> -Lifter tapping
>
> I already did the "ATF in Engine Oil" trick without
> success.
>
> What to do? Anybody had an identical problem and
> got rid of the ticking?

Might have to pull the head and replace the lifter.
You did make sure it's not the distributor making
that noise. Take the cap off and see if the rotor
will move side-to-side. It shouldn't move at all.

Could try running synthetic oil, that seems to have
make my lifters much more quiet, but they still tick
a bit. But if the lifter has collapsed you have no
option but to replace it.

--
DougW