Replace valve stem seals with cylinder head installed - AR05.30-P-3512MCC

ENGINE 132.9 in MODEL 451.3/4

Fig 1: Identifying Valve Tappet And Adaptation

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Valve Stem Seals With Cylinder Head Related Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Valve Stem Seals With Cylinder Head Related Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Remove
1	Remove fender liner in left and right rear fender at the rear	* not for USA ↓	AR88.10-P-1400MCC
		* for USA only ↓	AR88.10-P-1400MCU
2	Remove rear end CBS		AR88.20-P-1900MCC
3	Lower rear drive module	* not for USA ↓	AR01.00-P-3050MCC
		* for USA only ↓	AR01.00-P-3050MCU
4	Remove intake camshaft and exhaust camshaft	* not for USA ↓	AR05.20-P-6992MCC
		* for USA only ↓	AR05.20-P-6992MCU
5.1	Remove starter	ENGINE 132.9 in MODEL 451.3 (except 451.334/380), 451.4 (except 451.480) * not for USA ↓	AR15.30-P-7100MCC
		* for USA only ↓	AR15.30-P-7100MCU
5.2	Remove transmission cover	ENGINE 132.9 in MODEL 451.334/380/480 * not for USA ↓	AR26.30-P-0310-01MCC
6	Install retaining lock for engine		AR03.30-P-1600-06MCE
		Retaining lock	Figure
7	Remove spark plugs
			AP15.10-P-1580MCC
8	Screw adaptation (2) into the respective spark plug bore and attach compressed air hose	Adaptation	Fig 5
9	Apply compressed air to cylinder	This avoids the valve falling into the combustion chamber.
10	Screw in thread extension (3) and counter stay (4) in the area of the respective valves into a threaded hole on the cylinder head	Thread extension for retaining fork	Figure
		Repair tools for valves	Figure
11	Remove valve tappet (1) to the respective valves from the basic bore in the cylinder head	Do not use magnets. Gathering of the smallest metal shavings can occur due to magnetization of the valve tappet (1) which can lead to damage of valve tappet (1) and camshaft. When recycling the valve tappet (1), it must be reinstalled at the same location. The valve tappets (1) are designed in various thicknesses to compensate for the valve clearance. The dimension for the thickness of the valve tappet (1) is located on its underside.
12	Attach lever handle and depressor (6) to the thrust fork (5) and hook into the counter stay (4)	Depressor	Figure
13	Position depressor (6) in the middle on the upper valve spring retainer (8) and press valve spring (9) together through pressing together the lever handle
14	Remove valve locks (7) using suitable magnets and also remove thrust fork (5) using a depressor (6) and lever handle
15	Remove valve spring retainer (8) and valve spring (9)	Observe installation position of valve spring (9). The valve spring retainer (10) can remain in the cylinder head.
16	Detach valve stem seal (11), using pliers out of the valves repair tool, from the valve guide
	Install
17	Lubricate new valve stem seal (13) with engine oil
18	Insert new valve stem seal (13) on the valve stem (12) and press on using drift (14)	The new valve stem seal (13) must not removed again from the valve stem (12). The valve stem seal (13) is damaged during removal and is therefore unusable. Drift	Figure
19	Insert valve spring (9) and valve spring retainer (8)	Observe installation position of valve spring (9).
20	Hook thrust fork (5) with depressor (6) and lever handle into the counter stay (4)
21	Position depressor (6) in the middle on the valve spring retainer (8) and press together valve spring (9) through pressing down the lever handle, insert the valve locks (7) on the valve stem (12) in the cutout and then relieve the valve spring retainer (8)	Check for correct seating of the valve locks (7); repeat the operation step if necessary.
22	Remove thrust fork (5) with depressor (6) and lever handle
23	Insert valve tappet (1) on the respective valve in the basic bore in the cylinder head	When recycling the valve tappet (1), it must be reinstalled at the same location. The valve tappets (1) are designed in various thicknesses to compensate for the valve clearance. The dimension for the thickness of the valve tappet (1) is located on its underside.
24	Remove thread extension (3) and counter stays (4) on the cylinder head	Thread extension for retaining fork	Figure
25	Repeat operation steps 8 to 24 until all valve stem seals (11) have been replaced by new valve stem seals (13)
26	Disconnect compressed air hose and remove adaptation (2) from the spark plug bore	Adaptation	Fig 5
27	Install spark plugs
			AP15.10-P-1580MCC
28	Remove retaining lock for engine		AR03.30-P-1600-06MCE
		Retaining lock	Figure
29.1	Install starter	ENGINE 132.9 in MODEL 451.3 (except 451.334/380), 451.4 (except 451.480) * not for USA ↓	AR15.30-P-7100MCC
		* for USA only ↓	AR15.30-P-7100MCU
29.2	Install transmission cover	ENGINE 132.9 in MODEL 451.334/380/480 * not for USA ↓	AR26.30-P-0310-01MCC
30	Install intake camshaft and exhaust camshaft	The timing chain is not yet installed since the valve clearance should be checked before assembly. * not for USA ↓	AR05.20-P-6992MCC
		* for USA only ↓	AR05.20-P-6992MCU
31	Check valve clearance, adjust if necessary
	Set valve clearance		AP05.30-P-0560MCC
32	Lift and fasten rear drive module	* not for USA ↓	AR01.00-P-3050MCC
		* for USA only ↓	AR01.00-P-3050MCU
33	Install CBS rear end		AR88.20-P-1900MCC
34	Install fender liner in the left and right fender	* not for USA ↓	AR88.10-P-1400MCC
		* for USA only ↓	AR88.10-P-1400MCU