USA Motorcycling

Harley Davidson motorcycles are renowned for their classic design and robust performance. However, like any vehicle, they are susceptible to maintenance issues, with oil leaks being one of the more common problems owners may encounter. Oil leaks can occur in several places, such as worn head gaskets, valve cover gaskets, and oil pump seals. Riders often associate the iconic Shovelhead engines produced from 1966 to 1984 with the notorious image of a Harley leaking oil, primarily due to subpar quality controls during those years.

Understanding the Harley Davidson oil system is key to identifying and resolving leaks. The system has undergone numerous design changes over the years, with significant improvements, such as the redesigned oil pump introduced in the 2020 models. Despite these advancements, Harleys, like all motorcycles, can develop leaks over time. Causes range from simple wear and tear to more complex issues like a damaged oil pump check valve or overfilling of the oil tank. Preventative maintenance and timely repairs are crucial to ensuring the longevity of your motorcycle’s performance and avoiding the effects and dangers associated with oil leaks. But what else do you need to know?

Common Causes of Oil Leaks

Harley Davidson motorcycles are renowned for their style and performance, but they can sometimes be prone to oil leaks. By understanding these common issues, you can keep your ride in top condition.

Gaskets and Seals

Your Harley’s engine is equipped with gaskets and seals that maintain a tight barrier to prevent oil leaks. Over time, these components can deteriorate due to temperature fluctuations and constant pressure, leading to oil seepage. Notably, the head gasket, along with other sealing surfaces, must be regularly checked for wear and tear.

Oil Pump Issues

Issues with the oil pump can also lead to oil leaks. If the pump malfunctions, it may cause an inadequate seal or improper oil flow, resulting in leaks. Regular inspections ensure the pump maintains its integrity and operates as intended.

Drain Plug and Oil Filter

The drain plug and oil filter are common spots for leaks. If the drain plug isn’t tightened properly or the seal has worn out, oil can start to drip. Similarly, an improperly fitted or damaged oil filter can also be the culprit. Always make sure they are properly secured and free from damage after an oil change.

Rocker Boxes and Pushrod Tubes

Lastly, pay attention to the rocker boxes and pushrod tubes. If these areas develop leaks, it could indicate a need for replacement or a tightening of the components. Regular inspection can help identify leaks early and prevent potential engine damage.

Harley Davidson Oil System Overview

Your Harley’s oil system is the lifeblood of your engine, ensuring that each moving part is properly lubricated and cooled. Understanding the various components and how they work together is essential to maintaining your bike’s performance and longevity.

Lubrication System Components

The lubrication system of your Harley Davidson is designed to reduce friction and wear in the engine and transmission. Here’s what makes up this crucial system:

• Air Cleaner: It ensures that the air mixed with the fuel is free of debris and contaminants.
• Engine: The heart of your bike, where the oil is circulated to provide lubrication.
• Transmission: Gears are kept running smoothly with proper oil flow.
• Oil Tank: Acts as a storage for the oil before it’s pumped through the system.
• Oil Pump: This component draws oil from the tank and circulates it throughout.
• Automatic Lubrication System: Delivers controlled amounts of oil to necessary parts at varying engine speeds.
• Primary Chaincase: Houses and lubricates the primary chain, requiring its own supply of oil.

Oil Tank and Check Valve

Oil Tank:

• Location: Assumed to be at the bottom or side of the engine, depending on your model.
• Functionality: It stores the oil that will be circulated throughout the engine.

Check Valve:

• Purpose: Prevents oil from flowing back into the oil tank and keeps it where it’s needed.
• Significance: A faulty check valve can lead to issues like oil sumping, where oil accumulates in the bottom of the crankcase.

By keeping an eye on these systems and ensuring they’re functioning correctly, you can prevent the common dilemma of oil leaks that has been a notable concern for various Harley models, especially older ones like the Shovelhead engine. Regular maintenance and understanding how your bike’s oil system operates are crucial to a smooth ride.

Specific Model Concerns

When addressing oil leaks in Harleys, it’s important to consider that different models may have their own common issues. Your familiarity with these can help in faster diagnosis and repair.

Electra Glide and Road King

Your Electra Glide or Road King may present oil leaks that can be tricky to spot. Here are some specific concerns:

• Oil on the Crankcase: If your 2007 Electra Glide smells of oil while riding, but no drips are evident when parked, inspect the bottom of the crankcase. An oily residue on the drain plug often suggests oil is seeping from somewhere above.
• Breather Tube Issues: Some oil leak fixes include installing a special filter on the breather tube. This is particularly useful for older models of these bikes, keeping oil in the motor while allowing air to escape.

Road Glide and Street Glide

Analyzing oil leaks on your Road Glide and Street Glide motorcycles will often involve checking the following:

• Oil Pump and Check Valve: Should you find that your bike is leaking oil while running, consider inspecting the oil pump’s check valve. Leaks from this area tend to clear up following normal pressure from the oil pump.
• Oil Reservoir Levels: Overfilling the oil reservoir on your Street Glide may lead to oil seeping into the air filter. Keep the oil level between half and three-quarters full and check it while on the stand for accurate measurement.

Preventing and Addressing Oil Leaks

Oil leaks can be a nuisance, but with the right know-how, you can keep your Harley Davidson running smoothly. Regular maintenance and proper oil change practices are your frontline defense against leaks, and knowing when to visit the dealership is essential for more complex issues.

Routine Maintenance and Inspections

To prevent oil leaks, it’s key to stick to a schedule of regular maintenance. Your Harley’s engine thrives on attention, so make routine inspections a habit. Here’s what you should keep an eye on:

• Check for any loose bolts or fasteners every month.
• Inspect hoses and gaskets and replace them if they show signs of wear or damage.
• Ensure that the oil filter is tightly fitted and not clogged.

By being proactive, you can catch and fix small issues before they become big problems.

Harley Davidson Recalls and Criticisms

You may have heard about Harley Davidson’s recall history as well as some criticisms of their motorcycles related to oil leaks. Here’s the detailed scoop on what you need to know.

Recall Information

In recent years, Harley Davidson conducted a significant recall affecting around 57,000 bikes due to an oil line coming loose, posing a hazard. Furthermore, the company has also had to recall approximately 238,300 motorcycles over a clutch issue in certain 2017 and 2018 models.

Here’s a quick breakdown of recall events:

• July 1999-Present: Comprehensive recall database available.
• Recall over oil line: Affects 57,000 bikes.
• Clutch issue recall: Involves around 238,300 motorcycles from 2017 and 2018.

If you’re concerned about your bike’s recall status, you can reach out to Harley Davidson Customer Service for direct assistance.

Addressing Unreliable Criticisms

The criticisms regarding Harley Davidson bikes often revolve around the long past image of oil leaks, most notably associated with the Shovelhead engine. However, it’s important to acknowledge that technological advancements have significantly improved their reliability. Worn gaskets and seals, typical in the Shovelhead era, are not as common in modern Harleys.

To counter unreliable criticisms:

• Recognize technological evolution in newer models.
• Understand that older critiques may not apply to current bikes.

Though past models have faced their share of skepticism, it’s always prudent to base opinions on the most current and factual information available. Keep in mind that while no brand is without fault, steps have been taken to address and rectify past issues.

Troubleshooting Harley Oil Leaks

When you notice a spot of oil under your Harley, it’s crucial to address it promptly. Small leaks can grow, and sumping issues may lead to performance problems.

Identifying Small Leaks

Small leaks may seem trivial, but they can signal the beginning of a larger issue. Begin by cleaning your bike thoroughly; this will make new oil traces easier to spot. After a ride, inspect for fresh oil. Key areas to check include:

• Gaskets: Worn head and valve cover gaskets commonly give way to oil.
• Seals: Oil pump seals are frequent leak points.
• Oil lines: Ensure they are snug and not cracked or worn.

Dealing with Sumping Issues

Sumping is when oil pools in the crankcase and can lead to leakage. If you suspect sumping:

1. Check if the bike’s oil tank is overly full, which may indicate oil is not returning properly.
2. Inspect the oil pump, particularly the check valve; it should prevent oil from flowing back and pooling.
3. Ensure the oil bag/tank vent line is clear to allow air in and prevent pressure build-up pushing oil out.

Remember, regularly maintaining your Harley and addressing leaks early will keep your ride smooth and save you from more complex repairs down the road.

Effects and Dangers of Oil Leaks

Your Harley-Davidson is an intricate machine where every component counts for optimal performance. An oil leak is not just a mess—it’s a serious concern. Let’s explore how oil leaks can impact engine performance and the risks they pose.

Impact on Engine Performance

Oil is the lifeblood of your engine. It lubricates moving parts to reduce friction, keeping everything running smoothly. When your Harley leaks oil, it’s often indicative of excess oil from the breather or other seals. A decrease in oil level means reduced lubrication, which leads to increased friction among engine parts. Low oil pressure can make it harder for your engine to operate at peak efficiency.

• Engine lubrication: Reduced oil levels affect lubrication, causing more friction.
• Oil pressure: Leaks can lead to low oil pressure, crucial for keeping your engine parts well-oiled.

Risks of Engine Overheating

An oil leak in a Harley-Davidson engine might not seem like it directly causes overheating, but it’s a contributing factor. With less oil in the system, the remaining oil works harder and can break down more quickly under high temperatures. This breakdown can lead to engine overheating. Secondly, if oil reaches the floor, it can be a safety hazard, increasing the risk of slips or falls—particularly if the oil seeps onto parts of the tire.

• Overheating: The engine could overheat due to diminished oil, causing potential engine damage.
• Safety hazard: Leaked oil on the garage floor poses a risk to you and your bike’s safety.

Harley Leaking Oil: Myths vs Facts

When it comes to your Harley-Davidson, you might’ve heard about the lore of oil leaks or maybe you’ve witnessed a few drops beneath your own bike. Let’s set the record straight between myths and facts regarding this topic.

Myth: All Harleys leak oil, no matter what.
Fact: While older models may have had more issues, modern Harleys are well-engineered to prevent leaks. Regular maintenance can usually keep your bike leak-free.

Common Concerns:

• Harley leaking oil after sitting: It’s not uncommon for any motorcycle that has been sitting for an extended period to show some signs of oil seepage. The oil can settle, and gaskets or seals may dry out, causing minor leaks. Once you start riding regularly again, the leaks might stop as the gaskets swell from oil exposure and heat.
• Harley leaking oil at head: Sometimes, you may notice oil around the cylinder head. This could be due to a failed gasket, which is replaceable. A proper assessment by a technician can determine if the head gasket or another component is at fault.

Pro Tips:

• Keep an eye on where your bike is parked for any signs of oil.
• Perform regular oil changes and maintenance.
• Consult with a certified Harley-Davidson technician if you’re unsure.

Remember, not all oil drops are from a leak; sometimes it’s just a bit of overflow from the airbox or a sign you need a quick check-up. Always refer to your Harley’s manual and speak to a professional for personalized advice.

Frequently Asked Questions

In this section, you’ll find concise answers to common questions about oil leaks in your Harley Davidson, helping you to diagnose and remedy the issue effectively.