300TD (123.193) L5-3.0L DSL Turbo (617.952) (1984)
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2nd version: Cap nut reinforced in upper range, with larger supporting surface (B).
3rd version: Cap nut reinforced in upper range and hard-chromed.
Identification: silver colored.
On engines with chilled cast iron camshaft and rocker arms with carbide facing, only the hard-chromed cap nut may be installed.
The hard-chromed cap nut can also be installed on engines with chilled cast iron camshafts and rocker arms with inductance-hardened and hard-chromed
running surface.
Spare parts (ET) Sindelfingen will keep only hard-chromed cap nuts in stock.
Punched valve spring retainers (B) are installed instead of cold flow molding valve spring retainers (A). The punched valve spring retainer is recognized
by the narrow guide ring for valve spring (B, dotted surface).
In the event of repairs, these valve spring retainers (B) can be installed on engines installed up to now.
Production breakpoint: February 1981
Salt bath-nitrited counternuts (formerly phosphatized) are installed to improve operational reliability.
When stocks are exhausted, only the modified counternuts will be available.
The part number has not been changed.
Production breakpoint: October 1983
