a used a motor that works in my 190e 2.3. to me the 84 and 91 motors look alike. any quick way to tell? getting a used motor tomorrow(unseen) would like to be sure it will replace the 88 motor before i install it,
thanks rich

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88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car

There is a motor number stamped on the block, under the intake side. The 1984 motor (102.961)was lower compression and HP than the later M102 motors (102.985). In the later motors, MB updated some of the timing and fuel injection pieces.