Question 1

Why should the crank be rotated after installing each piston?

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Question 2

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

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Question 3

A rolling head prybar is handy for aligning what part?

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Question 4

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

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Question 5

What should be installed on the rod bolts to protect the crank against accidental nicks during piston installation?

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Question 6

Two technicians are discussing crankshaft bearing installation. Technician A says that upper and lower main bearing inserts are always interchangeable. Technician B says to lubricate the backsides of the bearing inserts before installing them. Who is right?

Accepted Answer

Technician B is correct because lubricating the backsides of the bearing inserts before installation is not recommended; lubrication is applied to the surface that contacts the crankshaft to ensure proper lubrication during engine operation. Technician A is incorrect because upper and lower main bearing inserts are not always interchangeable; they may have different designs or features to accommodate specific load characteristics or oil flow requirements in the engine.

Question 7

In automatic transmission cars, which seal should be replaced while the engine is out?

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Question 8

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

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Question 9

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?

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Question 10

When tightening the exhaust manifold bolts, which ones are tightened first: inside or outside?

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Question 11

An OHC cylinder head is being installed on an engine. Technician A says that some OHC cylinder heads cannot be installed if the camshaft is not positioned correctly at TDC. Technician B says that valves can be bent if the correct procedures are not followed. Who is right?

Accepted Answer

Both technicians are correct. Technician A is right because the alignment of the camshaft at Top Dead Center (TDC) is crucial for some Overhead Cam (OHC) engines during cylinder head installation to ensure proper timing and valve operation. Technician B is correct because incorrect installation procedures, including improper timing alignment, can lead to valves contacting the piston, causing them to bend.

Question 12

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

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Question 13

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?

Accepted Answer

Technician A is correct because a missing alignment bushing can indeed lead to misalignment between the engine and transmission, potentially causing a broken flexplate due to uneven stress distribution. Technician B is also correct because forcing an engine into alignment with its mounts can place uneven pressure on the engine block, potentially leading to distortion of the cylinder bore.

Question 14

The engine should be run at 1500-2000 rpm for _____ minutes when first started after a rebuild.

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Question 15

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

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Question 16

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

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Question 17

How are the rings broken in during a test drive?

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Question 18

Each of the following can result in reduced crankshaft bearing oil clearance EXCEPT:

Accepted Answer

Dirt on the block or the main bearing parting halves does not affect crankshaft bearing oil clearance.

Question 19

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

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Question 20

If the block does not have aligning pins for the timing cover, how can the cover be aligned?

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Quiz 16: Reassembly and Starting