Rattley JD exhausts

[Flat 10]

I have several JDs all of them rattle but one 6620 is particularly bad. At a loss. Checked heat shield not cracked that I can see, all Allen bolts tightened, checked rubber mounts but it’s still driving me mad, it’s by far the loudest noise in the cab. I should say that engine runs very nicely so doubt this is any sort of factor. There must be something obvious I’ve missed. @Phil P @Tractortech and anyone else. TIA

 

[Tonym]

Sound like the baffles inside the exhaust have broken off their spotwelds. Only repairs would be new exhaust or cut open the existing one, reweld the baffles them weld it back together.

 

[Phil P]

Has the strap that goes around the exhaust box snapped? Causes the box to rattle against the bracket on the head.

 

[Flat 10]

Sound like the baffles inside the exhaust have broken off their spotwelds. Only repairs would be new exhaust or cut open the existing one, reweld the baffles them weld it back together.

Are there baffles in the pipe? This is where noise is worst.

 

[Flat 10]

Has the strap that goes around the exhaust box snapped? Causes the box to rattle against the bracket on the head.

I’ll check. Noticed one snapped when I did head on one of them and welded up so that’s definitely a possibility.

 

[nick...]

My 6620 rattled but found a crack in heat shield and repaired and far better.i think things rattle at a certain idle speed.another50 rpm makes a huge difference
Nick...

 

[Flat 10]

My 6620 rattled but found a crack in heat shield and repaired and far better.i think things rattle at a certain idle speed.another50 rpm makes a huge difference
Nick...

Agree with you about rpm but as said in OP no heat shield cracks. OTOH @Phil P the bracket that we welded that holds silencer clamp on has broken again so I will buy another one this time. Thanks

 

[cousinjack]

Our 10 series rattles where the pipe that goes along under the cab meets the upright stack... don't know if it's the same design on the 20's but the 4cyl are worse for it than the 6cyl..

 

[Tractortech]

Now Then..
I usually have the tractor running at the revs where the rattle is. Then gently poke and prod it. Most times you can make it rattle and stop it too then it's easy to work out.
Generally they're OK..

 

[KB6930]

Try the heat shield over the manifold and turbo there's a bracket at the back end that breaks

 

[Flat 10]

Try the heat shield over the manifold and turbo there's a bracket at the back end that breaks

Good idea

 

[Flat 10]

Agree with you about rpm but as said in OP no heat shield cracks. OTOH @Phil P the bracket that we welded that holds silencer clamp on has broken again so I will buy another one this time. Thanks

New bracket is much stronger.....

 

[Flat 10]

Our 10 series rattles where the pipe that goes along under the cab meets the upright stack... don't know if it's the same design on the 20's but the 4cyl are worse for it than the 6cyl..

I think you can buy a replacement with improved brackets......