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Old 07-23-2018, 10:17 PM
Join Date: Oct 2017
Location: Roanoke, Virginia
Posts: 3
Prechamber Removal OM621

I've been looking everywhere online to find a tool to remove the prechambers on my OM621 engine. Lots of info for every other MB diesel out there but none for the ole 4 cylinder. Trying to finish an overhaul due to a blown head gasket which means the head needs planing, so the prechambers have to come out.
Any information will help.
1965 190Dc
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Old 07-24-2018, 03:09 AM
Registered User
Join Date: Mar 2003
Posts: 398
Everything you've found for om615/616/617 (w115 and w123's) on this matter applies for om621 too. They use the same collars (hence the tool,thread M24x2mm ) and the thread on the PCs is the same (M22x1mm).

You can build your own tool for the pc threaded collars out of a proper sized socket ... and for the pc removal you can use a bike crank tool + a slide hammer (google the threads on this forum for further info).

The tools themselves are not too expensive . One can find a taiwanese replica of the collar tool for $30-35...the PC threaded ones(for use with a slide hammer ) are more expensive(roughly twice the price).
Baum Tools ,Sir Tools , ZDMack , Klann ;Shimano or Park crank puller tool...
I'd make sure I had the PC rings of the right height too...and the glow plugs-removed before the intervention.
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Old 07-24-2018, 04:25 PM
Join Date: Oct 2017
Location: Roanoke, Virginia
Posts: 3
Sure, I am waiting to get the head back but I'll give it a try. I read all the things you've mentioned, but since they never specifically say for an OM621, I figured those tools would not work.
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