Replacement of valve stem seals
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05—270 Replacement of valve stem seals
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Valve clearance
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with engine cold (approx. 20
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with engine warm (60 C±15
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Intake
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0.101)
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0.151)
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Exhaust
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0.35
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0.40
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M 0.05 mm higher during lasting outside temperatures below —20 °C.
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Valve adjusting wrench 14 mm (2 each)
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615 589 00 01 00
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Holding wrench for valve spring retainer
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615 589 00 03 00
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Slip gage holder, red
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0.10 mm thick 0.15 mm thick 0.20 mm thick 0.35 mm thick 0.40 mm thick
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617 589 00 40 00
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Slip gage blades
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617 589 00 23 00 617 589 01 23 00 117 589 00 23 00 617 589 03 23 00 617 589 04 23 00
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Assembly mandrel for valve stem seals Intake and exhaust
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617 589 00 43 00
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Socket 27 mm, 1/2″ square, for rotating engine
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001 589 65 09 00
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Contact handle for rotating engine (component of compression pressure recorder 001 589 46 21 00)
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001 589 46 21 08
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05.8-270/1 F 2
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Conventional tool
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Cylinder leak tester
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e.g. made by Bosch, EFAW 210 A made by SUN, CLT 228
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Note
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Valve stem seals of intake and exhaust valves are of different design and should not be mixed up. They are differently colored to show difference.
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Intake valve stem seal
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– black
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Exhaust valve stem seal — green
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In addition to oil wiper lip (A), the valve stem seals also have a gas sealing lip (8).
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A Oil wiper lip B Gas sealing lip
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Renewing
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1 Remove rocker arms with rocker arm brackets (05-235).
2 Remove valve springs (05—250).
3 Force off valve stem seals with a screwdriver or pull off with pliers.
Attention!
Do not damage valve stem and valve guide.
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05.8-270/2
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4 Lubricate new valve stem seals and mount by means of assembly mandrel.
For this purpose, be sure to place an assembly sleeve on valve stem.
5 Install valve springs (05—250).
6 Install rocker arms with rocker arm bearing brackets (05-235).
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7 Adjust valve clearance (05—210).
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05.8-270/3 F 2
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