A、A.hold the valves open
B、B.keep the valves off their seats until the exhaust stroke is completed
C、C.close the valves
D、D.open inlet valves when the air injection cycle begins
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A、most critical in a four-stroke cycle diesel engine B、most critical in a two-stroke/cycle diesel engine C、most critical in a four-stroke/cycle diesel engine if it is turbocharged D、of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
A、A.engine operating speed B、B.an air manifold C、C.a hydraulic distributor D、D.individual cams and valve gear
A、the air start valve timing gears and rods B、a cylinder check valve C、individual cams and valve gear D、an air manifold poppet valve
A、A.increased engine breathing efficiency B、B.excessive valve lash C、C.excessive lube oil consumption D、D.lower than normal fuel consumption
A、a cylinder air charge of higher pressure B、increased pumping losses C、less valve overlap D、reduced blow-by
A、reduce wear on the valve stem B、permit the use of alloy valve seat materials C、reduce heat transfer from the valve seat D、facilitate valve removal for servicing
A、excessively late injection timing for each cylinder B、incorrectly adjusted intake valve timing C、incorrectly adjusted fuel injector D、incorrectly adjusted intake valve clearance
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