Preventive Maintenance and Troubleshooting Chapter 12.
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Transcript of Preventive Maintenance and Troubleshooting Chapter 12.
Preventive Maintenance and Troubleshooting
Chapter 12
Objectives
Know how to clean and engine. Check and change the oil in a four-cycle
engine. Mix fuel and oil correctly for a two-cycle
engine.
Objectives
Perform preventive maintenance on engine systems, including the crankcase breather, air cleaner, and muffler.
Prepare a water cooling system for storage. Describe systematic troubleshooting. Use manufacturer’s service manuals to
determine engine specifications and explain why this information is necessary when servicing a small engine.
Preventative maintenance
It is what it sounds like. List some tasks that would fall under the
heading of preventative maintenance.
Keeping Engines Clean
What if the cooling fins are not clean?
Methods of cleaning Compressed Air Scrape with a wooden block Aerosol Cleaner
Checking oil level and condition
Dipstick
Filler Plug
What happens if there is too much oil?
Checking oil level and condition
How do you know when to change oil?
Loaded oil:
Changing Oil
Warm the engine up first. Why?
The name of the game is to get all the old oil out and keep everything dirt free.
Oil filters:
Mixing oil and fuel
Some gas…then oil...shake…rest of gas…shake
Oil should remain suspended indefinitely. If fuel is stored for a few weeks or more,
gasoline stabilizer should be added to prevent oxidation, varnish, and corrosive acids.
Condensation
Why does it happen?
How can you prevent it?
Air Cleaner Service
Before each season, or more often in dusty conditions.
Follow manufacturer’s recommendation (especially if under warranty).
Oil-wetted
Dry types
Dual-element
Crankcase Breather Service
Muffler Service
Why might you need a new one?
NEVER CLEAN WITH GASOLINE!
Maintaining Water Cooling System
Rust Inhibitor:
Flushing (Reverse Flushing):
Should you run straight water?
Systems Cooled with Saltwater
Saltwater is extremely corrosive.
Gearbox should be removed from water when it is not running.
Fresh water should be run through the engine using a scoop or operating the engine in a barrel of fresh water.
Everything should be wiped clean with an oily rag.
Storing Water Cooled Engines
Antifreeze Rust Inhibitor
Drain Completely if the engine won’t be used all winter.
Drain gearcase of outboard engines and refill with the proper grease.
Follow manufacturer’s recommendations.
SYSTEMATIC TROUBLESHOOTING K.I.S.S. Check the easiest things first.
What does an engine need in order to run? - - - - - -
Checking RPM
Using the engine’s vibration
Optical Tachometer
Stoboscope
Test Compression
List the steps:
What should compression be?
What are we checking for?
Test Differential Pressure
Leak down test:
What are we checking?
How is it done?
Service Information
Look in the service manual.
Follow the recommended procedures. Most engines will be the same, but it is good to read about your engine b/c something may be a bit different.
Troubleshooting Charts
Very handy!
Tolerances, Clearances, Torque, and Sequence You MUST check them and they MUST be
right. Cutting corners will only hurt your
performance and your engine in the end.
Objectives
Know how to clean and engine. Check and change the oil in a four-cycle
engine. Mix fuel and oil correctly for a two-cycle
engine Perform preventive maintenance on engine
systems, including the crankcase breather, air cleaner, and muffler.
Objectives
Prepare a water cooling system for storage. Describe systematic troubleshooting. Use manufacturer’s service manuals to
determine engine specifications and explain why this information is necessary when servicing a small engine.