My truck makes a strange noise on startup sometime. You can see it at 0:11 of this video.

http://dev.mantlegames.com/rob/truck_groan.flv

Any ideas? It started during the winter I believe. It only does it when it's cold and it usually doesn't last more then a few seconds (rarely it'll go for 30 seconds).

I bought a remanufactured engine and my timing chain guides broke after < 80,000km. I just replaced them, chain and headgasket. This video is post replacement and it's still making the same sound. Last year when the noise started, I replaced the waterpump and distributor.

Truck is driving better then ever though on it's short test drives so far, but I'm worried about driving it until I figure out what's wrong.

If you can't see the video, try installing
http://www.videolan.org/vlc/

Thanks!

 

Can you tell which side of the motor its coming from? Could it be the clutch fan?

 

My best guess is a bearing is on it's way out. Fan, alternator, power steering, A/C compressor, etc.