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Audio clip of my engine noise

Frank,
Hopefully someone will chime in to listen to your tape, but will say I'm very impressed with the clarity of the recording and yes the clunk does seem louder when the motor is warmed up.
 
Frank

If I were you , I would disassemble the oilpan to have a look at the bearings.
Just my 0.02ct opinion.
 
That's a tough one.

Here's my take....

At idle, it does sound kinda like a rod knock but there's something off on the rhythm. Further, IME, that knocking only gets louder as engine RPM is increased and is still very distinctive over engine noise. Perhaps my ears aren't interpreting right.

Frank, you're saying oil pressure is still comparatively nominal, right?

My next step would be to put the car on stands, remove all accessory belts, including the water pump/fan belt, and run the engine using a mechanics stethoscope to pinpoint the noise. A helper will be required. Start the engine cold and run it until satisfied that noise is isolated or until engine temperature due to lack of cooling impels a shut-down.

Start with the area you think is obvious, the engine block and oil pan area, then, if no joy, move around to other areas, noting what you hear. The helper can operate the throttle at your instruction and watch water temp.

I'd do some diagnostics before pulling the oil pan. That's my opinion. Hope it works out.
 
I must agree.....close to a rod knock but...... I had an oil pump on a Jeep that sounded like that and it still functioned. Replaced it and no noise.

As mentioned, do more testing before taking things off. Sometimes you can "feel" the pounding by laying your hands on the oil pan and valve covers to give you a place to start. Sounds like that will travel thru an engine.
 
If anything, the oil pressure is slightly higher, I guess due to the 20W50 oil.

That's a good idea about taking the belts off to isolate the noise.

Just a thought--would a loose/worn timing chain cause that kind of noise?

Frank
 
If it is so loose that it is slapping the sides of the timing cover.....yes. I have seen one wear thru the cover and still run.

Did the noise change any with the heavier oil.
 
Doesn't sound like a rod to me, too high pitch and the rhythm is off. Pulling the drive belts is a good idea. You can check the slop in the chain by moving the crank back and forth while the dist. cap is off and see how much movement the crank gets before the rotor moves. Put your hand on the fuel pump and see if it has a clunk feel at that rhythm, the chain is right by the fuel pump drive.

If it needs a different motor, I have a few good used ones here your welcome too.
 
Just to add to the possiablites, a wrist pin or pistion slap.
Try pulling one plug wire at at time while idling to isolate the cyl.
 
"AzPete" said:
Did the noise change any with the heavier oil.
Click to expand...

I first noticed the noise right after the oil change.

It's definitely more noticeable when warm. I don't hear it on startup.

I'll try all of the above ideas.

Frank
 
If you went to a heavier oil, I would be tempted to try the lighter oil again before tearing it apart. May be a bit heavy for the pump.....
 
"crustycurmudgeon" said:
Thank you, John, for the offer. I hope it doesn't get to that, though.

Frank
Click to expand...

Heck I hope it does. That means a BBQ at John's place when picking up the motor and then another BBQ at Frank's place when installing the motor.
 
Food - Food - Food - Food - Food , that's all you think about. Damn, now I'm hungry for BBQ . . . .

SHARI ! ~ What's for dinner ?
 
I agree, sounds wrong for rod knock. Very interested to see what this turns out to be-

BTW, Had BBQ tonight :yah
 
I wasn't able to definitively isolate the noise with a stethoscope. The only thing that came close was perhaps the fuel pump. There's very little slop in the timing chain. I didn't take the belts off, as the car has to be warmed up for the noise to even become evident. The oil pump sounds plausible as well, since I first noticed it after changing from 30wt to 20W50.

Frank
 
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