Measure piston projection - AR03.10-P-7041-01AW

TEST VALUES FOR PISTONS

Number	Designation			Engine 601, 602 except 602.98, 603	Engine 604.910/912
BE03.10-P-1001-02B	Piston projection (a) with new crankcase		mm	0.74...0.96	0.735...0.965
BE03.10-P-1001-02B	Piston projection (a) with new crankcase	See picture in		-	AR03.10-P-7041-01A
BE03.10-P-1002-02B	Piston projection (a) with machined crankcase		mm	0.96...1.16	0.835...1.015
BE03.10-P-1002-02B	Piston projection (a) with machined crankcase	See picture in		-	AR03.10-P-7041-01A

Fig 1: Identifying Dial Indicator (001 589 53 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Dial Indicator Holder (343 589 00 40 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

After replacing the pistons/connecting rod or machining the crankcase contact surface, it is necessary to measure the piston projection.

Measure projection between piston crown and contact surface of crankcase without cylinder head gasket fitted on.

The measurement must be carried out in the direction of the piston pin in order to eliminate piston rock.

Position piston at TDC
Measure piston projection between piston crown and crankcase contact surface at the two measuring points (arrows).

Fig 3: Locating Piston Projection Between Piston Crown And Crankcase Contact Surface Points

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.