prevent piston ring wear
shorten the ring break-in period
prevent cylinder liner glazing
appear slick and glazed
第1题：
Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except______.
A.open the indicator cocks
B.supply some CYL.Oil to cylinder liner wall with lubricator (only for two stoke diesel engine)
C.put the fuel handle in the "stop" position
D.pump up the air bottle
第2题：
clogged fuel injection pumps
increased cylinder liner wear
intake valve stem corrosion
varnish deposit on pistons
第3题：
Diesel engine blow-by is the leakage of combustion gases past the( ).
A.oil rings only
B.compression and scraper rings
C.cylinder liner sealing
D.cylinder liner ring grooves
第4题：
crankcase
piston
cylinder liner
crank cheek
第5题：
open the indicator cocks
supply some LO to cylinder liner wall with lubricator
put the fuel handle in the stop position
pump up the air bottle
第6题：
clogged coolant passages
a leaking cylinder head gasket
low fuel oil pressure
worn or broken cylinder liner sealing rings
第7题：
prevent any lubricant from reaching
prevent excessive lubrication from reaching the combustion space
Provide metal-to-metal contact to seal the cylinder against blow-by
assure a positive means of scraping carbon accumulation from the cylinder
第8题：
Low compression in a diesel engine could be caused by
A.worn or broken cylinder liner sealing rings
B.high cooling water temperature
C.worn or broken piston rings
D.low fuel oil pressure
第9题：
starting the engine while hot
knurling the piston skirt
operating the engine overheated
scuff resistant piston rings
第10题：
(1) only is correct
(2) only is correct
both (1) and (2) are correct
neither (1) or (2) axe correct