Exam 16: Reassembly and Starting

A recently rebuilt engine has several burned pistons. Technician A says that pistons can burn or seize in the cylinder due to an intake manifold air leak. Technician B says that too rich an air-fuel mixture is a likely cause of this problem. Who is right?

What should be done to threaded holes in the block before reassembling the engine?

Briefly explain what happens when vapor lock occurs.

What service is performed on distorted stamped-steel oil-pan and valve-cover screw holes?

Why is the crank pried forward and backward before torquing the thrust main bearing cap?

Would an oil pump mounted inside the crankcase usually use a gasket on its outlet?

A technician has installed a new camshaft and is now installing the distributor. Technician A says to be sure that the number one cylinder is on its intake stroke. Technician B says that the engine can be cranked or turned by hand until the distributor and oil pump are aligned. Who is right?

A rolling head prybar is handy for aligning what part?

Some main bearings have dowels that must fit into a hole in the block.

Technician A says when reassembling an engine, mushroom-style lifters must be installed after the camshaft. Technician B says it is impossible to straighten a warped camshaft. Who is correct?

Technician A says that a broken flexplate can result if an alignment bushing is missing and the engine and transmission are not in alignment. Technician B says that forcing an engine into alignment with its mounts can result in a distorted cylinder bore. Who is right?

The first service and checkup is recommended at _____ miles after an engine rebuild.

A feeler gauge is used to measure mechanical valve lash.

On an engine with a standard transmission, insure the flexplate is installed correctly.

What procedure can be performed to its companion when a cylinder's valves are both rocking during valve overlap?

Following an installation of a rebuilt engine, a technician breaks in the engine by accelerating from 45 mph to 55 mph and coasting back to 45 mph several times. During this process, which of the following is/are true?

Technician A says when the timing is advanced, the idle will be high. Technician B says to check connecting rod side clearance with an inside micrometer. Who is correct?

Technician A says that if a distributor has a gear on the bottom of its shaft, the oil pump cannot be primed in the normal way. Technician B says the lubrication system can be primed with a pressure primer. Who is correct?

Technician A says backfiring will occur if the distributor is installed 180° off. Technician B says a rebuilt engine should not be run at idle speed for the first few minutes after it is started. Who is right?

When painting, how can you protect machined areas you do not want paint to stick to?