Maintenance - Minor Service

1. Change the engine oil and filter

Oil changes will be much quicker if the machine is first ridden far enough to warm up the engine to normal operating temperature this will thin the oil and ensure that any particles of dirt or debris will be retained in suspension in the oil and flushed out with it.
Place the machine on its center stand on level ground, place container of at least 4 liters (approx 7 Imp pints, 4 US qts) beneath the crankcase. Unscrew the filler plug from the engine right-hand outer (crankshaft) cover, then use a suitable Allen key to unscrew the drain plug from the center of the sump (oil pan). While the oil is draining into the container, clean the drain plug carefully, wiping any metal particles off its magnetic insert, and renew its sealing washer if it is worn, flattened or damaged.
Remove the three retaining screws and withdraw the oil filter cover, noting the sealing 0-ring. Wash the cover in a high flash-point solvent and renew the 0-ring if it is worn or damaged.
Unscrew and discard the oil filter element. On very early 100 models the element had a hexagon form moulded into its lower end to permit fitting and removal, using a suitable spanner. However, it was over tightened by some owners to the point where the filter cracked or its seal failed under pressure, or even the crankcase lower section was cracked. The machining of the filter sealing surface was modified on later models to lessen the risk of this happening, and a modified filter element was introduced which has no hexagon and therefore requires a special tool, BMW part number 11 4 650 to fit and unscrew it. The tool is reasonably cheap and should be easily available from any authorized BMW dealer; in fact after market versions of it are already available. If the tool is not available, the sump (oil pan) must be withdrawn (see Chapter 5 - Fuel & Oil) and the filter unscrewed using a strap wrench or similar car-type filter removal tool; if this is done the oil pump pick-up screen should be cleaned as described in Chapter 5 - Fuel & Oil. Note that none of the early type filters should now remain in service; all should have been replaced by the later modified type.

When all the old oil has drained, thoroughly, clean the filter sealing surface and apply a film of oil to the new filter's sealing ring. Screw the new element into place by hand only until it seats lightly, then tighten it by a maximum of half a turn. If tools other than the BMW special tool (or a pattern version of it) are being used, be very careful not to over tighten the filter element or to damage its casing as it is installed. Refit the sump (oil pan) as described in Chapter 5 - Fuel & Oil, if applicable. Ensuring that the sealing 0-ring is correctly installed, refit the filter cover and tighten the retaining screws securely; use the specified torque wrench setting, where available. Ensuring that its sealing washer is correctly installed and its threads are clean and dry, refit the angina oil drain plug and tighten it securely to its specified torque wrench setting.

Fill the crankcase with the specified amount of the correct type and viscosity of engine oil, refit the filler plug, then start the engine and allow it to warm up to normal operating temperature to distribute the new oil fully around the angina. Stop the engine and wait a few minutes for the level to settle then check it and top up, if necessary, as described under the daily check heading. Wipe off any spilt oil, check that both filler and drain plugs (and other disturbed components) are securely and correctly refitted, and check subsequently for signs of oil leaks.

Note that whenever the sump (oil pan) is removed, the crankcase interior should be wiped clean with a lint-free cloth and the oil pump pick-up filter gauze should be cleaned. Refer to Chapter 5 - Fuel & Oil.

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Unscrew drain plug from center of sump (oil pan) to drain engine oil


Engine oil filter is located inside separate cover bolted to sump (oil pan)


Oil filter element must be removed using a special tool which engages its shaped end...


... and is unscrewed using a spanner or other tools as shown


If special tool is not available car-type filter strap wrench can be used as shown after sump (oil pan) has been removed


Fit filter element as described in text, being careful not to over tighten - note oil pump pick-up filter gauze, which must be cleaned whenever sump (oil pan) is removed


Check sealing O-ring is correctly installed when refitting filter element cover