ENGINE REPAIR weekly quiz 11/6/2020

When checking the main bearing fit with plastigage,

• rotate crankshaft after tightening cap

• rotate crankshaft before tightening cap

• do not tighten cap

• do not rotate crankshaft

If insert-type bearing is properly fitted to a crankshaft, it will have^

• a slight drag

• clearance of 0.00075 inch-0.0015 inch

• drag but not lock

• clearance of 0.006 inch - 0.008 inch

Little or no increase of a wet compression test following a low/dry compression reading may indicate

• a burned valve condition

• weak compression rings

• excessive cylinder taper

• early valve timing

After a wet/dry compression test, the compression reading on one engine cylinder reads 85 psi dry and 120 psi wet. This usually indicates

• a leaking head gasket

• worn-out piston rings

• worn valve guides

• burned valves

Low oil pressure can be the result of

• worn piston rings

• worn valve guides

• a clogged oil filter

• worn bearings

A typical interference angle would find the valve faced at an angle of ____________degree(s) less than the seat angle

• 1

• 2

• 3

• 4

Overhead cam engines timing chains may use ______tensioners

• Mechanical

• Spring

• Hydraulic

• All of the above

Timing belt service intervals are critical on many engines because

• timing affects idle quality

• loose belts may damage the water pump

• valve damage may occur if the belt fails

• Both A and C

An engine emits blue smoke for a few seconds when starting cold; the MOST likely cause is

• Fuel system is too lean

• A coolant leak to the cylinder

• Worn valve seals

• Worn piston rings

What is the primary advantage of round-toothed timing belts when compared to square-toothed timing belts?

• Less expensive

• Higher torque capacity

• Shorter service intervals

• Quieter operation