Just saw this on books4 cars:

68-86 4 cyl gas engine service manual by Mercedes for 220 & 230 & G-Wagen ( 115 ) as in such models as 230E 230TE 220 and more

http://www.books4cars.com/3way/result2.asp?findyear=1986

Sounds like the one to me!

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'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.

"A Mercedes-Benz is like a fine wine, it only gets better with age."