Repairing threaded holes for cylinder head bolts - AR01.40-P-1220AO

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ENGINE 120

Fig 1: Identifying Cylinder Head Bolts And Threaded Holes Dimension

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing, installing
1	Remove cylinder head		ra01001204150x
2	Widen hole	ø 12.5 mm, pay attention to core hole drilling depth	*BE01.40-P-1002-02C
3	Tap HELICOIL thread		*BE01.40-P-1002-02C
4	Screw in HELICOIL threaded insert	Pay attention to installation depth. Set installation depth by means of setting ring on spindle.	*WH58.30-Z-1001-33A
5	Use snap to snap off driver stud and remove
6	Install in the reverse order

TEST DATA OF CRANKCASE

Number	Designation			Engine 120
BE01.40-P-1002-02C	Threaded hole for cylinder head bolts repair version	Thread ø	M	12
		Threaded insert below contact surface dimension "A"	mm	5
		Dimension "B"	mm	2.5-3.5
		Dimension "C"	mm	14.4-14.6
		Screw-in depth HELICOll threaded insert dimension "D"	mm	14.4-14.6
		Original thread length dimension "E"	mm	40
		Core hole depth from contact surface dimension "F"	mm	45
		Dimension "G"	mm	51
		Fig. see		AR01.40-P-1220AO

COMMERCIALLY AVAILABLE TOOLS

Number	Designation
WH58.30-Z-1001-33A	HELICOIL - special version of workshop packingM12