Why Do I Have a Puddle of Bar Oil Under My Chainsaw? (Guide)
Finding a puddle of oil underneath your chainsaw can be concerning. The bar oil is a key component that lubricates the chain and bar to keep your chainsaw running smoothly during operation. A leak indicates there may be an issue that needs attention. Don’t worry – in most cases, it is an easy fix. This guide will explore the common reasons for bar oil leaks and provide actionable tips to resolve them.
Bar oil is essential for reducing friction and preventing overheating, wear and tear as the chainsaw chain glides over the bar. Without proper lubrication, your chainsaw risks expensive damage. A sufficient oil supply ensures:
Smooth and efficient cutting: Oil enables the chain to glide seamlessly along the bar rather than grinding against it. This allows smooth, efficient cuts.
Prevents overheating: Friction from an unlubricated chain/bar combination causes rapid overheating. Oil cools components.
Minimizes wear and tear: Oil reduces friction between moving parts. This greatly increases the lifespan of bars and chains.
Safety: A well-oiled chain is less likely to bind or kickback when in use. This reduces risk of injury.
While most modern chainsaws feature an automatic oiling system, leaks can still occur and require attention. Finding and resolving them quickly saves you money and keeps your chainsaw running safely.
Common Causes of Bar Oil Leaks
There are a few typical culprits for bar oil leaks on chainsaws:
Gummed Up Oil Holes
After extensive use, sawdust and debris can clog the oil outlet hole under the bar. This prevents proper oil distribution. Ensure the hole is clear of obstructions. Use a wire brush, needle or blast of compressed air to remove built-up residue.
Loose Fasteners
The oil pump attaches via small screws underneath the chainsaw body. Vibration from use can loosen fasteners over time. Check for loose screws around oil pump components. Tighten any loose fasteners with a screwdriver. Apply threadlocker for added stability if leaks persist.
Worn or Damaged Oil Lines
The oil delivery lines between the pump and bar naturally degrade over time. Inspect tubing for cracks or holes that cause leaks. Replace any worn lines. Also check fittings for tightness at both pump and bar ends.
Faulty Oil Pump
With extensive use, internal gears or components of the oil pump can wear out. This reduces pumping capacity and pressure. A lack of pressure causes leaks past seals and gaskets. Test pump functionality and rebuild or replace if needed.
Blocked Tank Vent Hole
Some chainsaw models feature a small vent hole inside the oil tank. Sawdust or debris can block this hole, causing a vacuum and preventing proper oil flow. Use a paper clip or pipe cleaner to clear the vent.
Actionable Solutions For Resolving Bar Oil Leaks
Step 1 – Thoroughly Clean The Chainsaw
Before inspecting components, clean built-up debris around the underside. Caked on sawdust and grime can conceal leaks or damage. Use a brush, scraper and compressed air to remove residue. Wipe down with a rag and solvent cleaner.
Step 2 – Locate The Source Of The Leak
With a clean saw, add a small amount of oil to the tank. Operate the chainsaw briefly to circulate oil. Then tip the saw to locate the source. Look for fresh oil dripping from holes, gaskets or lines. Also inspect the bar oil hole for clogs.
Step 3 – Tighten Loose Fasteners
Use a screwdriver to check all screws around oil pump components and lines for tightness. Snug down any loose fasteners, being careful not to over tighten. Stripped screws must be extracted and replaced.
Step 4 – Replace Worn Lines and Gaskets
Inspect rubber gaskets around the oil pump for deformation. Check lines for cracks or holes. Any worn gaskets or degraded tubing must be replaced. Ensure fittings are tight at both ends of oil lines after replacing.
Step 5 – Test and Rebuild The Oil Pump
Separate the bar and chain to access the pump. Manually activate the pump lever and check that oil flows freely from the outlet. If flow seems low, the pump may need rebuilding or replacement. Consult your chainsaw service manual for pump rebuilding procedures.
Step 6 – Clear A Clogged Bar Oil Hole
If other areas check out, focus on the bar oil hole. Remove bar and chain and use a wire brush, needle or compressed air to remove built-up debris inside the lubrication hole. Reinstall components and test oil flow.
Be sure to take safety precautions including wearing gloves and eye protection when cleaning and inspecting your chainsaw. Follow all manufacturer guidelines if disassembling pump components for rebuild or replacement.
Tips to Prevent Bar Oil Leaks
Here are some helpful ways to avoid bar oil leaks happening in the first place:
1. Check oil levels frequently – Don’t let the oil tank run dry, as this allows pump operation without lubrication. Top up oil level every time you refuel your saw.
2. Use quality bar oil – Specialized bar oils contain additives to prevent gumming or thickening over time. Avoid substituting cheaper alternatives that could clog oil delivery components.
3. Frequently clean guide bar – Prevent debris buildup by regularly brushing off sawdust around the guide bar, particularly the oil holes. Maintain smooth chain/bar operation.
4. Inspect oil system seals – Check for cracked, worn or deformed seals around the oil pump annually. Replace seals proactively during maintenance to prevent leaks.
5. Clear vent holes on tanks – Use a fine wire or pipe cleaner to maintain open vent holes on bar oil tanks and prevent vacuum lock.
6. Review owner’s manual – Follow all lubrication system guidelines regarding suitable oils, inspection intervals, part replacement times and troubleshooting.
Avoiding leaks in the first place saves time and money over the long run. But even with careful maintenance, wear will occur. By quickly identifying and addressing the cause of leaks, you can get your chainsaw back up and running smoothly.
Frequently Asked Questions
Q: Where exactly should I check for loose screws or fasteners?
A: Focus on fasteners around the oil pump itself underneath the saw. Also check any fittings securing oil delivery lines at either end. Consult your owner’s manual for specific locations. Generally 4-5 screws secure the pump components.
Q: How can I test if the oil pump is working properly?
A: Separate the bar and chain to access the pump. Manually operate the pump lever while observing oil output. Oil should flow freely without spurts or sputters if the pump is functioning fully. Low flow indicates worn pump components.
Q: How do I unblock a clogged oil hole on the guide bar?
A: Remove bar and chain from saw. Shine a flashlight at an angle into the oil holes to check for compacted debris inside. Use a wire brush, needle or blast of compressed air to break up and remove built-up sawdust.
Q: Where can I find replacement oil pump components or lines?
A: Many chainsaw parts including oil system components are model-specific. Check with your saw dealer or manufacturer using your make/model information to find the correct replacement parts. Aftermarket parts suppliers may also carry suitable generic replacements.
Q: What weight oil is best for bar and chain lubrication?
A: Chainsaw manufacturers recommend using high-quality bar and chain oils with a viscosity rating of SAE 30. These oils contain tackifiers and other additives to cling to bar/chain components while resisting throw-off. Never substitute cheaper alternatives like used motor oil.
Q: How often should I replace the oil delivery lines?
A: There is no set replacement interval for oil lines, as lifespan depends on use levels. Inspect lines periodically for cracking or deterioration, especially if dealing with leaks. Proactively replace lines every 2-4 years with heavy use to prevent leaks from worn tubing.
I hope this guide has helped explain some likely reasons for finding a puddle of oil under your chainsaw along with actionable solutions for addressing bar oil leaks. Don’t hesitate to consult your owner’s manual or contact the saw manufacturer directly if you have any other questions. With a few simple fixes, you’ll have your trusty chainsaw back up cutting in no time!
