Extra Rattle

[wwwabbit]

We have a early 80's Grumman "bread truck/milk van" as our command truck for our Search and Rescue group. It has the 6.2l GM diesel in it. All in all I think to does OK, but no one wants to drive the stinky diesle but me (they all love the new F550 V10 gasser )

Anyway, I have noticed over the last month or so there is a new "rattle" coming from the front of the motor. Sounds the worse when it is in a low idle when warm, then when it is rev'ed up even a little bit. Sounds like an extra diesel knock, or something a little loose rattleing against something. I have gone over everything I can... it sounds louder at the front of the motor then the rear of it.

Thoughts on what it could be?

 

[towcat]

how many km/miles on the motor and does it have surging issues?

 

[wwwabbit]

I don't remember how many km's on it... although I think it has been around the block more then once. No surging issues, it idles solid and drives with constent power. A good part of it's time, when it is on a call, is spent with the foot on the floor.

 

[towcat]

I'm starting to think a timing chain that's about to let go very soon

 

[dieseldummy]

Crack the injector lines to see if it is cylinder specific. Could be as simple as a sticky injector. Also make sure that the cold timing advance is coming off once the engine is warmed up.

 

[wwwabbit]

The cold idle is coming off, is there something else for the timing advance?

I will see what kind of time I can get with it tomorrow evening to crack a few lines and see if there is an injector sticking.

Timing chain eh? That does not sound good.... that is why I like the gears in my truck. Any easy way to confirm that?

I wonder if I could talk them into replacing it with a 6.5 turbo