Your Harley-Davidson Street Glide depends on three separate oil types to transfer power from the v-twin motor to the pavement: engine oil, primary oil and transmission oil. While changing the engine oil is a basic motorcycle maintenance skill, many new Harley-Davidson riders are often left in the dark when it comes to changing the primary oil. Fortunately, the process is fairly simple, requiring only a few tools and a minimal time investment.
Things You'll Need
- Torx 40 socket
- Socket wrench
- 1 qt. primary oil
- Primary inspection cover gasket
- Oil catch basin or container
- Towels or rags
Locate the oil drain plug and place your oil catch basin below it. The plug is placed under the left side of the motor, just below the primary "derby" cover.
Remove the primary drain plug with a Torx 40 socket attached to a socket wrench and allow the primary oil to drain.
Inspect the primary drain plug o-ring for damage, replacing the o-ring if necessary. Wipe away any metal shavings that may be attached to the plug's magnetic tip with a clean rag. Set the drain plug aside.
Remove the primary inspection cover, which is a rectangular-shaped panel located just before the derby cover. Remove the gasket from the primary inspection cover and discard.
Replace the primary drain plug, tightening it snugly against the primary cover.
Add primary oil into the primary by pouring it through the primary inspection port. This will take a maximum of 1 quart of primary oil. Do not overfill.
Place a new gasket on the primary inspection cover before re-installing.
Wipe away any spilled oil and dispose of used primary oil properly.
Tips & Warnings
- If possible, consult a service manual for comprehensive details about this process, torque specifications and other maintenance requirements.
- Start the motorcycle and let it warm up for a few minutes to help the primary oil flow better when draining. Be sure not to let the oil get too hot to prevent from getting burned.
- If you do not feel that you can complete this project, have the work done by a qualified technician.
- Do not over-tighten bolts to prevent damage. If possible, use a torque wrench to accurately tighten fasteners.
- If the drained primary oil smells burnt, your Street Glide may have a damaged or faulty stator. Have the motorcycle inspected by a qualified technician immediately.
- The Professional Motorcycle Repair Program; Professional Career Development Institute; 1995
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