Anyone with a OM601/602/603: You should check the throttle linkages
in your engine. They were made with plastic ball sockets. Older
(ironhead) engines used steel ball sockets that fail less frequently
If you still have plastic sockets, you should order steel
replacements from Rusty. Normally the linkage rods had one left hand
thread socket and one right hand thread socket. On my 87 603, I
found the rods had both ends threaded right hand.
I highly recommend changing plastic sockets for steel sockets. being
stranded because a goofy plastic link fails is easily preventable. I
found the first (outermost) linkage had been changed, but the two
linages under the manifold had not.
Here is the procedure:
1. Order new sockets from Rusty 000 993 04 61 (800 741 5252)
2. Get or scrounge 4 nuts. (Same size as glow plug) for lock nuts
3. Remove old linkage
4. measure C to C between the sockets, and you might want to also
take a Length overall measurement as a secondary reference.
5. unscrew the plastic sockets
6. put on a nut on each end of the rod, screw it all the way down
7. put on the new ball sockets.
8. adjust length to the correct C to C length (double check with
LOA, but C to C length takes precedence) On one of my linkages, I
had to Omit the nut and screw the socket all the way down to get the
C to C length short enough. Be sure to align the sockets correctly
They may be aligned or rotated 90 degrees, depending on the rod
9. tighten locknuts (8mm wrench) Use vice or vicegrips to hold rod
10. replace link on engine
If anyone needs left hand thread sockets, let me know. I have a
couple I don't need.
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