Gentleman, I am in need of experience and expertise... Can someone tell what might have gone wrong here? Or hypothesize such that I can try to figure out what is going on? As always, I am deeply indebted and humbled by the knowledge of those in the profession. Injector Seal Ring Burn through Picture

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique

looks to me like either the injector face is trenched or the prechamber face is trenched.
(or you did a joe and under torqued it)


Joe

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Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364

The crush seemed good in that the center ring is forced downa dn when I compare it onthe bench it looks like it had a good seal.
torque value was 54 or 57 ft lbs. Can't remember at the moment. Which I think is correct according to Haynes.

Could a "trenched" prechamber cause a slight miss? this is my symptom and I have been trying a lot of things to correct this problem. I also used about a quart of oil ove the 550 miles with a motor that compression checked at 345 to 360 psi in all 5 holes. I'm thinking valve stem seals for fixing this...
As you can tell I'm grasping at straws here!

I'm about ready to try a different IP and see if this will fix it but I only have access to a 1985 MW pump and this is a 1980. Should that be a problem though? The pump looks identical in all respects. I also have access to a 1979 M-RSF pump but it does not have the vacuum bleed mount on it. Would this matter for testing? I don't know why I am obsessed with the pump as the root of this problem other than it seems I have done just about everything else to try to isolate it.

__________________
'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique

Anyone ever actually seen this problem before?

__________________
'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique