quiz 3 Flashcards
wrench to use on fuel line fittings
flare nut
instrument use to measure crankshaft runout
dial indicator
what measures main bearing journal diameter
micrometer
needle movement on dial bore gauge from top of cylinder to bottom
out of round
measurement, biggest to smallest on each axis of cylinder to find
taper
wrench never used to loosen fasteners
torque wrenches
correct wrench used to loosen fasteners
socket
hammer used for engine disassembly
dead blow
standard pitch/thread count of metric fastener is measured in?
mm per thread
fastener used for high clamping force
uniform bearing stress (UBS) fastener
when altitude increases, what is the effect on the air/fuel mixture
lean
ratio of air/fuel mixture enter cylinder vs 100% full
volumetric efficiency
detonation
spontaneous combustion after normal timed ignition
pre-ignition
a point within the combustion chamber when it becomes so hot that it becomes a source of ignition and causes fuel to ignite before spark plug fires
service limits
wear limits for in service engine
5 events of 4-stroke engine
intake
compression
timed ignition
power
exhaust
stroke def
piston travels from TDC-BDC and vice versa
wrist pin retainer clip
retainer clip opening in line to be with the connecting rod
push rods function
transfer linear motion of lifter to rocker arm
used on most linline 4,6,v-6,v-8 engines
camshaft motion
changes rotary motion to reciprocating motion
loop scavenging
transfer ports are angled to minimize the loss of charge out of the exhaust ports
2-stroke induction systems
piston port
cylinder reed
case reed
crankshaft motion
reciprocating motion to rotary motion
valve overlap disadvantages
loss of torque
hp at low rpm
possibility of high exhaust hydrocarbon emissions
cylinder leak down % if engine is in good condition
6-14%
yamaha model # first character F
1
4-stroke
setting cam tension on auto cam chain tensioners
fully auto chain/belt tensioners adjust as engine is running
they do not use locking bolt
valve lash on screw locknut system, cylinder being adjusted is in what position
rotate crankshaft to TDC compression
if there is low compression, how would you determine if the piston rings are the cause
add a little bit of oil into cylinder and recheck. if compression rises, the piston rings are worn
2-stroke cylinder configurations
single cylinder
inline series
v-series
cylinder position on leak down test
rotate crankshaft until piston of cylinder is at TDC on compression stroke
temperature of engine for compression test
operating temperature
first step to remove stern drive engine
disconnect battery for safety
when changing a 40hp engine to a 75hp engine, what do you check
the fuel condition
1/4 * 20 * 1/2 fastener, what does the 20 mean
20 threads per inch
the difference in high/low readings that would indicate problems during compression test
when the difference is greater than 10%
