Tightening procedure for crankcase bottom section - AR03.20-P-4351-05L

CRANKCASE, TIMING CASE COVER, END COVER

Number	Designation					Engine 137	Engine 275, 285
BA01.40-P-1008-01C	Bolt, crankcase bottom section to top part	1-14	M10	Stage 1	Nm	40	40
		1-14	M10	Stage 2	∠°	90	90
		15-28	M8	Stage 1	Nm	12	12
				Stage 2	∠°	90	90
				Stage 3	∠°	90	90
		29-54	M6	Stage 1	Nm	8	8
		29-54	M6	Stage 2	∠°	-	-
		55-61	M8	Stage 1	Nm	20	20
		55-61	M8	Stage 2	∠°	-	-
				See picture		-	-

Bolt assignment

Fig 1: Identifying Bolt Assignment Of Crankcase

Courtesy of MERCEDES-BENZ USA

Attach bolts by hand and tighten slightly e.g. with a battery-operated screwdriver

Inner and center threaded connection:

Tighten bolts 1 to 14 according to tightening stage 1, starting with bolt 1.
Drive in dowel pins.
Tighten bolts 15 to 28 according to tightening stage 1, starting with bolt 15.
Tighten bolts 1 to 14 according to tightening stage 2, starting with bolt 1.
Tighten bolts 15 to 28 according to tightening stage 2, starting with bolt 15.
Tighten bolts 15 to 28 according to tightening stage 3, starting with bolt 15.
External threaded connection:
Tighten bolts 29 to 35 starting with bolt 29.
Tighten bolts 36 to 39 starting with bolt 36.
Tighten bolts 40 to 54 starting with bolt 40.
Tighten bolts 55 and 56, starting with bolt 55
Tighten bolts 57 and 61, starting with bolt 57