BMW R1100 Spezifikationen PDF herunterladen (Seite 46)

Leaking Cam Covers and Oil filler Cap - Stephen Karlan (Dali Meeow)

If you own an R850 or R1100 BMW and there is excessive grime or some messy

oil leaks around the oil filler cap or the black plastic cam covers at the rear of the

cylinders, then your bike might benefit from some high temperature O rings. The

original O rings are made of soft materials and will deform after extended use

and heat.

The solution is two-fold. While you are changing O rings, also check the plastic

for any casting flash. This hint comes from Rob Lentini, who suggests that you

run your fingers over the inside of the plastic parts and feel for bumps or rough

spots created when the parts were made. Many plastic parts have this bump or

ridge and, if it has not been smoothed, it provides a path for oil to leave the

engine. Take fine wet-dry sandpaper or a fine file and smooth off any bumps.

Thanks to Bob Gorman for identifying the problem. He said, "For some reason

BMW choose to use an o-ring made out of a very soft material. Over time this

material will loose its 'O' and become flattened, allowing oil to easily flow around

the seal." Even the Viton O rings will wear over time, but that should be

measured in years.

The second part of the solution is to replace the O rings with a high temperature

material called Viton. These are made for aircraft and are used in extreme

conditions --they work well in the BMW. There are several sources for these

Viton O rings, such as a local seals or bearing shop listed in the Yellow Pages.

Here are step-by-step instructions for replacing the O rings:

REPLACING THE OIL FILLER O RING.

Do this with the engine cold. Locate the black plastic oil filler cap on the top of

the left cylinder and remove it. Inspect the filler cap and check the O ring on the

bottom to be certain that it is soft and not damaged. Do not remove the O ring on

the inside of the filler cap, this is not the one you want to replace. Put the filler

cap aside.

There is a black plastic ring still in the cylinder head. Locate the black tab at the

rear of the ring that mates with a small depression in the cylinder head; observe

this tab because you must line up the tab when you reinstall the plastic ring

later. The O ring that you want to replace is located on the outside edge of this

black plastic ring; this O ring is the only thing holding the black plastic ring in

place. Remove the black plastic ring carefully by placing your pinky finger in the

oil filler hole and pulling up gently or by prying it out (try a flat-head screwdriver).

When it is out, use your fingers or a small flat-head screwdriver to remove the

old O ring on the outside of the plastic ring, check the plastic, and install the

smallest of the Viton O rings (Parker #214) from the set of three that you will

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BMW R1100 Spezifikationen Seite 46