Mercury Monterey Specifications download pdf (Page 17)

GROUP 1-ENGINES AND EXHAUST SYSTEMS

TABLE

1—

Manifold Vacuum Gauge Readings

PLUNGER

A1265-A

FIG.

6-Correct Position of

Eccentric

Six, position the valve rocker arm.

If an end valve rocker arm was

removed, slide it into position on

the shaft and install the washers and

retaining pin. Perform a preliminary

valve lash adjustment as necessary.

Operate the engine until normal

operating temperature has been

reached. Check and adjust the valve

lash or Silent Lash clearance.

On an engine with hydraulic valve

lifters,

install the valve rocker arm

shaft.

8. Install the valve rocker arm

cover(s) and the air cleaner.

MANIFOLD VACUUM TEST

A manifold vacuum test aids in

determining the condition of an en-

gine and also in helping to locate

the cause of poor engine perform-

ance.

To test manifold vacuum:

Operate the engine for a mini-

mum of 30 minutes at 1200 rpm.

Install an accurate, sensitive

vacuum gauge in the intake mani-

fold fitting.

Operate the engine at recom-

BE SURE

PLACE INDICATOR

TIP IN

CENTER

OF PUSH ROD SOCKET

Al333-A

FIG.

7-Camshaft Lobe Lift-

Mechanical Valve Lifters

Gauge Reading

18 inches—All engines.

Low and steady.

Very low.

Needle fluctuates steadily as

speed increases.

Gradual drop in reading at

engine idle.

Intermittent fluctuation.

Slow fluctuation or drifting

of the needle.

Engine Condition

Normal.

Loss of power in all cylinders caused possibly

by late ignition or valve timing, or loss of

compression due to leakage around the piston

rings.

Manifold, carburetor, spacer, or cylinder head

gasket leak.

A partial or complete loss of power in one or

more cylinders caused by a leaking valve, cyl-

inder head or intake manifold gasket leak, a

defect in the ignition system, or a weak valve

spring.

Excessive back pressure in the exhaust system.

An occasional loss of power possibly caused

by a defect in the ignition system or a sticking

valve.

Improper idle mixture adjustment, carburetor,

spacer, or intake manifold gasket leak.

mended idle rpm, with the transmis-

sion selector lever in neutral.

Check the vacuum reading on

the gauge.

TEST CONCLUSIONS

Manifold vacuum is affected by

carburetor adjustment, valve timing,

the condition of the valves, cylinder

compression, and leakage of the

manifold, carburetor, or cylinder

head gaskets.

Because abnormal gauge readings

may indicate that more than one of

the above factors is at fault, exercise

caution in analyzing an abnormal

reading. For example, if the vacuum

is low, the correction of one item

may increase the vacuum enough so

as to indicate that the trouble has

been corrected. It is important,

therefore, that each cause of an ab-

normal reading be investigated and

further tests conducted where nec-

essary in order to arrive at the cor-

rect diagnosis of the trouble.

Table 1 lists various types of

readings and their possible causes.

Allowance should be made for

the effect of altitude on the gauge

reading. The engine vacuum will de-

crease with an increase in altitude.

COMPRESSION TEST

Be sure the battery is properly

charged. Operate the engine for a

minimum of 30 minutes at 1200

rpm. Turn the ignition switch off,

then remove all the spark plugs. Re-

move the coil high tension lead at

the distributor cap.

Set the throttle plates (primary

throttle plates only on a 4-barrel

carburetor) and choke plate in the

wide open position.

Install a compression gauge in

No.

1 cylinder.

Using a remote starter switch,

crank the engine several times and

record the highest reading recorded.

Note the number of compression

strokes required to obtain the highest

reading.

Repeat the test on each cylin-

der, cranking the engine the same

number of times for each cylinder as

was required to obtain the highest

reading on the No. 1 cylinder.

TEST CONCLUSIONS

A variation of ± 20 pounds from

specified pressure is satisfactory.

SOLID TAPPET-TYPE

PUSH

ROD

BE SURE

PLACE Indicator

TIP

CENTER

OF PUSH

ROD

SOCKET

FIG.

8-Camshaft Lobe Lift-

Hydraulic Lifters

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 36 37

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Mercury Monterey Specifications Page 17

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