You determine when the engine oil was last changed by

The oil filter should be changed, some manufacturers recommend, every

Some manufacturers recommend draining the old coolant from the cooling system and putting in new every.

On the heated-air system, when the engine is cold, the door in the air-cleaner snorkel should be

Valve-tappet clearance is measured between the valve stem and the

On many engines, valve timing is checked by means of markings on the

On engines that have the rocker arms mounted in ball studs, tappet clearance is adjusted by

Engines equipped with hydraulic valve lifters normally require

In some engines, grinding valves and seats may require installation of

Before a valve seat is ground, the valve guide must be

If camshaft bearings are worn, they must be

Three polluting gases that the engine gives off are

On engines with solid or mechanical lifters, insufficient clearance can result in

Items that must be removed before the pistons can be taken out include the

Before the pistons are removed, it is necessary to remove the

The pollutant formed by high combustion temperature is

If piston-pin bushings are worn, they should be reamed or honed oversize and

Two methods of checking clearance of rod bearings are to use

The material which flattens varying amounts to indicate the amount of bearing clearance is called

Two characteristics of rod bearings that help ensure proper fit are

The additional height of the bearing shell over a full half is called

Before installing a piston ring, check the ring gap with the ring

A ring compressor should be used in installing the piston-and-rod assembly so that the rings will

Oversize rings are for use

Crankshaft main journals can be measured on the engine with either a crankshaft gauge or

If Plastic gauge flattens more at one end than at the other when you are checking main-bearing clearance, it means that the

Do not leave the crankshaft supported in V blocks for too long a time because this could cause the

If one main bearing requires replacement, you should replace

If some main bearings are worn more than others, the engine may have

Taper or wear in the cylinder is greatest at the