On the After 1985 Engines the Engines that use a Prechamber Collar/Ring with 2 Slots to retain the Prechambers and use the same style of Injector Bodies as on My 671.952. Those Injectors thread into the Collar itself.

On the Engines with the Prechamber set up for Angled Injection the Prechamber Collar/Retaining Ring is Slpined. On those Injectors the Threads are near the very bottom of the Injector; the Threads are finer and the Injector Threads directly into the Prechamber. Also the Threaded area diameter is smaller.

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84 300D, 82 Volvo 244Gl Diesel