What are the failure modes of the pre-chambers in a 617.951 engine? What symptoms are presented?

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)

I've seen the ball inside the pre-chamber break loose.

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Jim

Is there any way to determine if the ball pin is damaged without removing the pre-chamber?

I am experiencing a different combustion noise that doesn't sound like normal Diesel rap. It has gotten louder gradually

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)

Remove the Injector and get a very stong beamed Flashlight and look inside.
You might need to remove the Glow Plug to see it or have room.

Make a hooked shaped Tool and hook on to the Ball Pin and see if it moves around.

The red Arrow points to the Ball Pin.

Attached Thumbnails

 

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84 300D, 82 Volvo 244Gl Diesel

The tip sticking into the cylinder can get damaged, but I haven't heard of it yet. The result could be that the cylinder wall will be damaged (lack of compression) or that the diesel combustion will not be ideal, that can usually be heard (ticking or other diesel noises).

remeber air cleaner mounts make,noise,also a loose balancer will sound like a bad crankshaft

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1999 w140, quit voting to old, and to old to fight, a god damned veteran