Now that you’ve changed the engine oil, how about those other fluids?

There’s no greasy chain to adjust on a shaft-driven bike. But there is regular maintanence. If you don’t do it, you’re liable to destroy the seals and gears spinning inside. The replacement cost will make you wish your bike had a chain.
That’s why changing the final drive oil on a regular basis is key. Many people recommend it be done at 6,000-mile intervals — or about every time you change your motor oil.

Getting final drive oil into the pan requires ingenuity and good scotch.

Fortunately, it’s even easier than changing your oil.
Here’s what you do on a classic shafty, the BMW R1150RT:
First, gather your tools. You’ll need a torque wrench and a 6mm allen wrench for the filler plug, located on top of the rear hub. A 19mm socket fits the drain plug below it. Get a drain pan and cut a piece of cardboard or other material to keep the oil from draining onto your rear wheel. Also, you’ll need a small funnel and possibly a measuring cup.

Final drive drain plug is attractive, literally.

For oil, almost any GL-5 rated gear oil in the 75-90 weight will do. I am using Castrol 80-90, non-synthetic gear oil ($6.99 per quart at Kragen). Also, you must have two new crush washers. They are about 50 cents each at the dealer.
Start by positioning the drain pan under the drain plug with the cardboard chute in place. Remove the filler plug first. Then unscrew the drain plug and let the oil flow out. Inspect the plug. It has a magnet on it to catch metalic debris and keep stuff out of the works. If there’s a lot of metal on your plug, start saving for a new final drive.
Clean it off, put a new crush washer on it and screw it back in by hand. Torque it to about 17 foot-pounds.
Fill the final drive with fresh oil. It takes 230 ml or about 8 ounces. You may need a separate measuring cup if the oil bottle doesn’t have markings on the side. Castrol gear oil has a narrow tipped end that is perfect for getting the oil into the small filler hole.

Filler up.

Once you’ve filled it, put the filler plug in with a new crush washer. Tighten to 17 foot-pounds also. Dump the used oil in with the other stuff you’re recycling. I put it all in one-gallon iced tea jugs from Trader Joe’s. I like them because they are clear and have wide openings.

Bill’s garage: Oil change for the ’02 BMW R1150RT

As you’ve seen, changing the oil and filter on a motorcycle is a relatively simple task that even a beginner can do. Servicing this BMW sport-tourer is no different. Here’s a straightforward how-to on the bike.

Everything you need except the torque wrench and the beer.

First, assemble your tools and parts. You’ll need four liters of moto-specific oil. I use Castrol 20-50 4T because it’s cheap and they stock it at my local auto parts store. My filter is a Hiflofiltro HF163 ($9.95) instead of the BMW-branded filter at $18.95. In addition, you’ll need two new crush washers and shop towels.

For tools, you’ll need a torque wrench, a ratchet, a 76mm filter wrench, an 8mm allen head wrench or driver, an oil catch pan and a funnel. An aftermarket service manual is a nice thing to have, too.

Knowledge is power. Always have a shop manual nearby.

Get the bike hot and park it on the center stand. No need to remove the fairing. You can reach everything. Postion the catch pan and remove the drain plug with the 8mm driver. The plug is located on the bottom of the engine case. Be careful not to let it fall in the oil.

Drain plug with oil filter on right. Pink Schwinn in background.

Thar she blows!

Discard the old crush washer in a place where you won’t accidentally reuse it.

Clean plug and new crush washer.

Next, grab your filter wrench and ratchet and remove the filter. It is in a recessed spot near the drain plug. If the rubber gasket is not in the old filter when you take it out, check to be sure it isn’t stuck to the case. If so, reach up and pull it out.
Prepare your new filter by filling it with oil and spreading a bit of oil on the rubber gasket to help the seal.

Priming the filter and wetting the seal


Clean off any grit from the engine case before installing the new filter. The filter should be torqued to just 8 foot-pounds or about hand-tight.

You put the lime in the coconut ... or something like that

Going up. Installing the filter.

Clean the drain plug, put a new crush washer on it and install it, torquing it to 23 foot-pounds. Don’t overtighten.
Now you’re ready to fill the bike with oil. It will take about 3.75 liters. Don’t overfill it. It goes in the oil cap atop the left cylinder head. I use a small funnel and pour the oil carefully, so it doesn’t spill on the engine.

Oil goes in da hole.

Check your oil level by looking at the sight glass below the cylinder and behind the fairing. A flashlight helps to see it.
Finally, start the bike and check for leaks.
Pour the old oil in a jug and take it back to the auto parts store to recycle it.

High-tech records management system

I usually write the mileage and date on a piece of masking tape and stick it somewhere on the fairing. In 6,000 miles or so, I’ll change the oil and filter again.
You’re done!
–BV