Replace ring gear on flywheel · ar0330w8312c · Mercedes-Benz WIS

AR03.30-W-8312C

Replace ring gear on flywheel

13.9.06

ENGINE 457.9 in MODEL 374, 375, 940, 942, 943, 944, 958

W03.30-0014-04

1 Ring gear

2 Flywheel

A Bore to receive bolt for clutch pressure plate

B Ring gear inside diameter and flywheel diameter to ring gear mount

	Removing
 Danger!	Risk of injury to skin and eyes caused by handling hot or glowing objects.	Wear safety gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
1	Remove flywheel (2)		AR03.30-W-8002C
2	Use a welding torch to rapidly heat up ring gear (1) and press it off flywheel (2) using a suitable drift	 Put something under the flywheel (2).
	Measure
3	Measure ring gear inside diameter and flywheel diameter for mounting ring gear (B) on flywheel (2) and calculate overlap between ring gear (1) and flywheel (2)	 Possibly also replace flywheel (2) or rework diameter of the flywheel (2) to receive ring gear (1) to the next deviation and select a new ring gear (1) with the appropriate deviation.
		Flywheel dia.	*BE03.30-N-1005-03C
		Ring gear inside diameter	*BE03.30-N-1001-04G
		Overlap between ring gear and flywheel	*BE03.30-N-1002-04G
	Install
4	Heat new ring gear (1)	 The correct pulling on temperature is reached once the ring gear (1) has a bright yellow annealing color.	*BE03.30-N-1001-04G
5	Lay ring gear (1) onto the flywheel (2) as far as the contact surface	 Allow ring gear (1) to cool down for at least 2 minutes and then reposition ring gear (1) using a brass drift.
6	At centerings on ring gear (1) through the bores (A)	 Use dia. 11,0 mm drill bit. The centerings are needed to bore out the core bores.
7	Predrill core bores for thread in ring gear (1)	 Use dia. 4,5 mm drill bit.
8	Bore out core bores for thread in ring gear (1) to gauge block	 Use dia. 8,5 mm drill bit.
9	Turn flywheel (2) and chamfer core bores in ring gear (1)
10	Cut a thread in all core bores in ring gear (1)	 Use a thread cutter (M10).
11	Install flywheel (2)		AR03.30-W-8002C

Check values for flywheel

Number	Designation				Engine 457.9


BE03.30-N-1005-03C	Flywheel dia.	for mounting	Standard	mm	432.490 to 432.645
		Starter ring gear	Deviation 0.5	mm	431.990 to 432.145

Test and adjustment values for starter ring gear, flywheel

Number	Designation				Engine 457.9


BE03.30-N-1001-04G	Ring gear inner dia.		Standard	mm	432.000 to 432.155
			Deviation 0.5	mm	431.500 to 431.655
		Permissible radial runout at ring gear seat		mm	0,5
		Width		mm	18.25 to 18.75
		Installation temperature		°C	200 to 230
BE03.30-N-1002-04G	Overlap between starter ring gear and flywheel			mm	0.335 to 0.645

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