BMW R100R [135/168] Disassembling engine

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NOTE On the USA engine version slacken union nut 18 and take air line 16 off the cylin der head before removing the cylinder head Examining cylinder head Carefully clean combustion residues off combustion chamber and quench edge Examine combustion chamber in area of sparkplug bore seatfor signs of cracking Examine sealing surface for signs of dam age smooth off if necessary DISASSEMBLING CYLINDER HEAD Removing valves 11 4 DISASSEMBLING ENGINE NOTE Compression TDC is reached when NOTE The engine does not require to be removed for performing repair work and disassem bly of cylinder head cylinders pistons conrod and conrod bearings REMOVING CYLINDER HEAD Take off cylinder head cover 11 after slackening the cap nut 12 and the 2 fas tening nuts 4 Removegasket IO of cylinder head cov er Slacken spark plug 5 Turn clutch flange to position piston at compression TDC With engine installed engage 5th gear and set TDC by turning rear wheel 11 16 1 The TDC mark 2 appears in the inspec tion hole on the left engine housing 1 and 2 Inlet and exhaust valves of the appro priate cylinder are closed play can be felt at rocker arm Slacken locking nuts 9 at adjusting screws 15 After slackening the 4 collar nuts 8 take off rocker arm 13 togetherwith clamping blocks 7 and rocker arm shafts 14 Withdraw tappet rods 16 Slacken cylinder head nuts 6 Detach cylinder head from cylinder with light blows from a plastic headed ham mer Pull cylinder head off the tie bolts 3 Mount valve spring tensioning device BMW No 11 12 750 onto cylinder head Clamp tensioning device tight with central nut 1 Press valve spring down by turning spindle Separate valve cone from spring plate by light blows to the bottom of the valve valve head Use a magnet or pincers to remove valve collets 5 Release pressure on device Take off valve spring 3 top and bottom spring plates 2 4 Withdraw valves down the way Examining valves and valve guides for wear Clean combustion residues of valves Check diameter of valve stem Vs with external micrometer Wear limit for valve stem diameter Vs min Inlet 7 925 mm Exhaust 7 915 mm 11 17

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