Not sure what is on these sites or if they still work.

Blog Site W115/116
Restoring "Marlene Diederich": My Mercedes Diesel Rebuild: Service Manuals for the Mercedes W115 300D

W114/W115 forum
www.stroke8.org

W115 Manual part of
Mercedes-Benz Model 114/115

W115 the whole manual
Mercedes-Benz Model 114/115

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84 300D, 82 Volvo 244Gl Diesel