1.'Get the Factory Service Manual (on 2 CDs )
(Mercedes Classic Center,"Google" it or call
1-800-222-0100).You will need it.
2. DIY dooable BUT,You Must Maintain tension on
The timing Chain(and secure the Chain to the
Camshaft Sprocket at the same time)[Hint:
Tie Wraps at least 6 of them.]
3. You must follow the Factory specified R+R
schedule for the "Cam Towers" so that you
DO NOT distort (AND BREAK) the Camshaft.
All the information may be available on this forum,
But the FSM comes in handy forever!
[You're going to loosen the nut securing the Camshaft
Sprocket to the Camshaft,Then wiggle the Camshaft
out Backwards,After removing the Cam Towers,and
removing(thereby slackening...AND resetting)the Chain
Tension(er).]

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'84 300SD sold
124.128