1995 Chrysler Cirrus Engine taping at Idle but not while dr

Tiny
POET042005
  • MEMBER
  • 1995 CHRYSLER CIRRUS
Engine Mechanical problem
1995 Chrysler Cirrus 6 cyl Two Wheel Drive Automatic 102k miles

Things I have tried and found to be within specs.
1. Crankshaft and bearings
2. Flywheel/and cover
3. Oil screen.
4. Oil pressure
5. Oil level
6. Axles

Now after checking these things I cant seem to find the knock. I did pull one valve cover and started the engine to see if any lifters and or rockers were tapping but on that one side I did not hear anything I took the other side valve cover off moved rockers by hand looking for excesive clearence but did not find any. So now I am stummed even though I have not ruled out lifters as the possibility. How would I go about checking the rockers and lifters as possible culprits before I start aking the motor completly apart.

I would also like to rule out piston slap because Its not smoking in any way or burning oil.

Lastly I took a stethescope and listened all around the motor but again could not hear the tapping through the tool only without the tool but not sure where.

I can slightly here it the loudest under the car near the flywheel and cover openning.

and the tapping only happens when the car is idling after the engine has warmed up but when accelerating it goes away or when given gas at idle. Sometimes it goes away altogether before coming back.

ANy help would be great

Poet
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Thursday, July 1st, 2010 AT 12:33 PM

5 Replies

Tiny
KHLOW2008
  • EXPERT
Hi Poet,

Symptoms indicates the hydraulic lifters are the most likely cause. Most hydraulic equipped engines tends to have this problem when the engine ages.

The only way to rectify the problem is to service/replace the hydraulic lifters.
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Friday, July 2nd, 2010 AT 10:58 AM
Tiny
POET042005
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First off I thank you for your response to my question I see you found it in the forum. Well it just so happens that I've already changed the lifters as I figured well gotta try something but to no avail. The knock is still there. Now someone told me the knock could be the transmission input shaft even though i've never heard of this but I will say that I no the trans has been swapped once before. I was wondering whats your opinion on that and back to the pistons is there a test I can do to determine if its piston slap even though its no burning oil or smoking nor fouled spark plugs.

Hey and thanks again for the reply

Poet
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Saturday, July 3rd, 2010 AT 10:59 AM
Tiny
KHLOW2008
  • EXPERT
You're welcome.

Stethoscopes sometime do not transmit noises if the noise are hollow and the best way to get to the noise would be to use a rubber hose as stethoscope.

Intermittent noises are never easy to diagnose and it usually is something to do with the lubrications and lubrication acticvated parts. Even if you disassemble the engine, quite likely you might not find anything wrong, unless there are excessive wear on some parts.

Were the lifters replaced new or used?
Was there any difference after replacement?

Yours is an automatic so the input shaft nosie should not be the cause. That only occurs for manual transmissions.

Does the noise appears when the trans is shifted to D or R?

You mentioned the bearings were within sepcs, did you check the side thrust of the crankshaft?
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Saturday, July 3rd, 2010 AT 11:37 PM
Tiny
POET042005
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Well my friend the lifters were used I did make sure they were compressing and releasing before I installed I can now hear the lifters tapping with the engine as it accelerates or idles up and down the tap is constant and dose not go away which is a seperate noise from my original problem now I have a knock (the original problem) and a constant tapping ( which I no is the lifters). Ok what about doing a compression test cylinder by cylinder, I did check the thrust clearance and they were fine. When the car is shifted from D to R or N its no real difference in the original knock. The knock comes and go it never dose it when the car runs cold only after it warms up and even then hardly never while driving at any speed. The sound is a knock ant not a tapping for sure and it seems to be the loudest under neath the car but again the bears and thrust clearance were fine.

Any other Ideas please let me no it seems that my only option may be to dismantle and even then your right what I I find nothing.

Gonna try compression to check for cylinder pressure.

Thank u much
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Sunday, July 4th, 2010 AT 6:30 PM
Tiny
KHLOW2008
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I can't think of any other possibilities as you have covered all of them already.

Btw piston slaps might not incur excessive oil consumption.
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Monday, July 5th, 2010 AT 2:33 PM

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