WORK PROCESS
SMALL-ENGINE MECHANIC
O*NET/SOC CODE: 49-3053.00 RAPIDS CODE: 0525
DESCRIPTION: Repairs fractional-horsepower gasoline engines used to power lawn mowers, garden tractors, and similar machines, using handtools: Locates causes of trouble, dismantles engines, using handtools, and examines parts for defects. Replaces or repairs parts, such as rings and bearings, using handtools. Cleans and adjusts carburetor and magneto. Starts repaired engines and listens to sounds to test performance. Replaces engines on machine.
ON-THE-JOB TRAINING:
APPROXIMATE HOURS
A. MOTOR REPAIR
1000
1. Valves
a) remove, replace, replace and reseat
b) adjust valve tappet clearances
2. Pistons
a) reline cylinder walls
b) align pistons and rods
c) replace rings and pins
d) fit new pistons
e) replace or adjust bearings
3. Crankshaft – Cam Gear
a) inspect
b) turn or replace out-of-round shafts
c) replace cam gear
d) check and play
e) check and set timing
f) replace or adjust bearings
4. Engine Tune-Up
B. IGNITION
400
1. Plugs, Points, Condensers, Magnetos, and Wires
check, clean, adjust or replace
2. Automatic Spark Advance adjust or replace
C. CARBURETION
400
1. Air Cleaner clean or replace filter
2. Fuel System (Gravity) a clean, adjust or replace:
a. tank
b. needle valves
c. float
d. throttle controls
1) check, repair or replace fuel pump
2) check and adjust governor
D. STARTERS
200
1. Check, Adjust, or Replace Parts
E. ENGINE TUNE-UP AND TROUBLESHOOTING
750
1. Test and Adjust Plugs and Points
2. Test Compression
3. Check Timing
4. Adjust Valves
5. Adjust Carburetor
F.CLUTCH
150
1. Adjust, Repair or Replace
G. BENCH WORK
600
1. Operation of Various Machines
a) valve reface
b) lathe
c) drill press
d) arbor press
e) grinders
f) assorted hand tools
2. Welding Equipment burning, welding, brazing, soldering
H. ATTACHMENTS AND APPLICATIONS
500
1. Repair, Adjustment and Maintenance
a) mowers
1. rotary
2. reel type
3. riding
b) snow blowers
c) cultivators
d) snow and ice vehicles
e) chain saws
f) raying devices
g) generators
h) “go-carts”
i) pumps
j) garden tractors
k) outboard motors
TOTAL HOURS
4000
144 hours of related instruction are required for each apprentice for each year.
BLUEPRINT READING
- fundamentals
- assembly drawings – exploded, detail
- parts lists – reading, requisitioning
- schematic circuit
MATHEMATICS
- fundamentals
- electrical
- power
- estimating
SAFETY
- fundamentals – human factors, mechanical factors
- trade safety
- first aid
INDUSTRIAL AND LABOR RELATIONS
- history and background
- current regulations
- Trade Theory and Practice
- tools, machines and instruments
- operations, care and maintenance
- construction land terminology
- troubleshooting procedures
- electrical theory
TRADE SCIENCE PRINCIPLES OF:
- internal combustion engines – 2 cycle, 4 cycles
- electrical generation – magnetos, generators
- ignition
- power transmission
- friction
- properties of gasoline
- electrical theory
REFERENCES USE AND SOURCES OF PRINTED MATERIAL
- manuals
- handbooks
- parts lists
