Odd noise at cold start-up

[Kodiak]

For the past week I've noticed a light, rapid rattle upon slight pedal pressure after a cold start-up. It makes no difference if it is in gear or not. It almost sounds like something's caught in the fan (but that checks out clear). After a couple of minutes it goes away, not to return until the next morning. I can't track it down. Anybody got any ideas?



Thanks.

 

[JohnE]

Kodiak;



Overnight and morning temperatures been sliding lower on the mercury stick lately? All diesels will produce more noise when cold. Let it run a few minutes before starting out and keep your right foot light until it warms a bit. I usually start it and then go back in the house to grab my lunch sack, briefcase, etc. Winter is another story...



John

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edit

Just remembered something. In Engineeringese the rattle of a diesel (especially the cold prattle) is known as combustion noise. Gassers call it <em>knock. </em></font>

 

[Kodiak]

Thanks for the reply, JohnE. I don't think this is normal engine noise, though. It's more of a metallic clanking (but very light). I'm wondering if this is the kind of noise made by a failing fan clutch. Sounds like it's coming from that area, but it doesn't last long enough to nail down.



Guess I'll just have to wait until it graces me with its presence more often!



Thanks again.

 

[diesaldual]

Double check!! I had the same noise. . It was coming from the transmission... It would only do it first thing when it was cold. .

Not to sure what it was, but the last time my transmission man was in there he done some adjustments and turned up the pressure a little. .

 

[Kodiak]

diesaldual,



I didn't even want to say this out loud, but this is what I feared. I was kinda hoping somebody would say, "Oh, just give it a swift kick in the right rear tire, and the sound will go away. "



Did yours do this in neutral as well as Drive and Reverse?



From what you say, the good news is that this isn't a death rattle. A good transmission man can wave a dead chicken over the pumps and valves and make it good again. I'm there!



Thanks.