Connecting Rod Noise

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Old 18 Apr 2004, 10:19 pm   #1 (permalink)
EMC
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Default Connecting Rod Noise

I have a 1999 Camry LE with 89,000 miles. I have had oil changes every
3,000 miles and have done all scheduled maintenance work. I was just at
the dealer to do the 90,000 mile service and have the timing belt
replaced. While there, I asked them to check a noise I have been having.
It started abruptly about 8 months ago and is a ticking/tapping noise
which is loudest first thing in the morning or at a cold start, especially
on a cold day. I don't hear the noise at highway speeds, but can hear it,
although muffled, at lower speeds while accelerating. The mechanic kept
the car overnight to hear the noise first thing in the morning and said
that it sounded like a connecting rod noise caused by excessive clearance.
No explanation for how this could have happened. The same mechanic said
that it was a valve noise back in December, but this time he said he did a
more thorough check. He said that I could have major problems down the
road or the noise may just be bothersome. I don't know what to do --
should I just sell the car and cut my losses. Thanks.

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Old 21 Apr 2004, 05:00 pm   #2 (permalink)
Daniel M. Dreifus
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Default Re: Connecting Rod Noise

"EMC" <e.carpenter@nospam.earthlink.net> wrote in message news:<d299101208bcba4f578a4d29047c6a50@localhost.t alkaboutautos.com>...
> I have a 1999 Camry LE with 89,000 miles. I have had oil changes every
> 3,000 miles and have done all scheduled maintenance work. I was just at
> the dealer to do the 90,000 mile service and have the timing belt
> replaced. While there, I asked them to check a noise I have been having.
> It started abruptly about 8 months ago and is a ticking/tapping noise
> which is loudest first thing in the morning or at a cold start, especially
> on a cold day. I don't hear the noise at highway speeds, but can hear it,
> although muffled, at lower speeds while accelerating.


Get a second opinion (from another mechanic).

Could be something else, like a loose connection on the knock sensor.

You'd be talking about rebuilding the whole bottom end of the engine
to correct a connecting rod bearing noise, and it should be very
unlikely. WIth 3,000 mile oil changes at 89,000 miles, you should be
good for a lot longer unless there's a prior owner who neglected
maintenance.
Does your engine oil generally look fairly clean, or is it dark black?
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Old 21 Apr 2004, 07:50 pm   #3 (permalink)
EMC
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Default Re: Connecting Rod Noise

The oil never looks very dirty between oil changes, and the car doesn't
seem to burn any oil. I am the original owner.

Thanks for your help.

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Old 22 Apr 2004, 05:53 am   #4 (permalink)
m Ransley
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Default Re: Connecting Rod Noise

A noise when cold is usualy the valve train and can be of little worry
, When hot is usualy when lower ends make more noise as oil thins.

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Old 22 Apr 2004, 06:09 pm   #5 (permalink)
Jason James
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Default Re: Connecting Rod Noise


"EMC" <e.carpenter@nospam.earthlink.net> wrote in message
news:d299101208bcba4f578a4d29047c6a50@localhost.ta lkaboutautos.com...
> I have a 1999 Camry LE with 89,000 miles. I have had oil changes every
> 3,000 miles and have done all scheduled maintenance work. I was just at
> the dealer to do the 90,000 mile service and have the timing belt
> replaced. While there, I asked them to check a noise I have been having.
> It started abruptly about 8 months ago and is a ticking/tapping noise
> which is loudest first thing in the morning or at a cold start, especially
> on a cold day. I don't hear the noise at highway speeds, but can hear it,
> although muffled, at lower speeds while accelerating. The mechanic kept
> the car overnight to hear the noise first thing in the morning and said
> that it sounded like a connecting rod noise caused by excessive clearance.
> No explanation for how this could have happened. The same mechanic said
> that it was a valve noise back in December, but this time he said he did a
> more thorough check. He said that I could have major problems down the
> road or the noise may just be bothersome. I don't know what to do --
> should I just sell the car and cut my losses. Thanks.
>



Conrod bearing noise is loudest when the engine is up to operating temp. It
shows itself under load when the bearing is working hardest. This occurs
during acceleration and the bearing can 'rattle' when in its free state
which occurs at certain cruising speeds ( around 50-55mph) when
the throttle is feathered (not power-on, or off, but in between)

The easiest way to check for bearing noise is to warm the engine to
norm-op-temp, then run the revs to about 1300,..then quickly bring the
engine to 2500 rpm and back. Do this a few times and you should hear the
bearing if its loose.

Another way is to install an oil-pressure gauge. If there is a loud bearing,
it should show as lower than normal oil-pressure at norm-op-temp. Once the
engine is revved, the OP will climb quickly with it, then drop as revs drop
again.

Tapping noises when very cold is usually not indicative of a bearing. In an
engine like the Toyota twin OHC where there are no hydraulic lifters, a
noisy piston sounds more like it.

Any mechanical noise which gets louder as engine load increases, should be
checked out as breakage down the line can happen. Some engines such as the
early Suzuki small 4WDs had noisy pistons when cold as normal,...the 2.2 L
Camry donk is not one of them tho.

Seems like you are the victim of mis-adventure if it is a rod-bearing.

Jason


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