Small Gas Engines Chapter 3

The helical portion of a screw or bolt, or the helix in a hole that it fastens into is call a(n)

• wire

• thread

• needle

• valve

A type of hardened screw that makes its own threads, usually found in sheet metal, is a(n) ___________ screw.

• round

• bolt

• wood

• self tapping

The heads found on screws are very different than those found on bolts.

• True

• False

Flat head screws must be set into __________ holes.

• countersunk

• square

• round

• deep

The most common angle for flat head screw is _____________ degrees.

• 77 3/4

• 82 1/2

• 3/4

• 1/2

The four most common head types for set screws are:

• square, round, hexagon socket, Fluted socket

• round, hexagon, hexagon socket, slotted

• square, slotted, hexagon socket, and fluted socket

• hexagon socket, round, square, slotted

What is a palnut?

• a friend to a squirrel

• a single-thread lock nut applied and tightened after regular nut is in place.

• a double-thread nut applied and tightened before regular nut is in place

• a single-thread lock nut applied and tightened before regular nut is in place.

If a 1/8 inch rolled pin is to be used in a shaft, the correct drill size to use for drilling the hole for this pin should be _____ inch diameter.

• 1/8

• 1/2

• 1/4

• 1/16

when tightening bolts on an engine head use a(n) ________________ pattern unless a different pattern is specified by the manufacturer.

• clock wise

• counter clock wise

• every other one

• criss cross

_______________ are used between engine parts to seal and prevent leakage of engine oil, coolant, compression, and vacuum.

• glue

• rust

• gaskets

• holes