Actron Vacuum & Pressure Tester Kit CP7803 - Manual (Page 2)

0
Engine Vacuum
5
10
15
20
25 30
10 9 8 7
6 5 4
3 2 1 0 1 2
3 4 5 6 7
Fuel Pump psi
G
A
S O
L I N
E
0
Engine Vacuum
5 10
15
20
25 30 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7
Fuel Pump psi
0
Engine Vacuum
5
10
15
20
25 30 10 9 8 7 6 5 4
3 2 1 0 1 2 3 4 5 6 7
Fuel Pump psi
VOLUME TEST
1. Operate engine with fuel line connected to fill
carburetor fuel bowl. Stop Engine.
2. Disconnect the fuel line at the carburetor and
connect a flexible hose to the fuel line using the
adapter as shown in Figure 11. Insert the other
end of the hose in a proper gasoline container.
3. Have an assistant start the engine. While hold-
ing the gasoline can, carefully collect the dis-
charge from the fuel pump for exactly 30
seconds. The assistant must count off the time
precisely and turn off the engine after the 30
seconds to get an accurate measurement. Re-
connect the fuel line to the carburetor.
4. Remove the gasoline from the engine area.
Pour the contents of the gasoline can into
another container marked off in fluid ounces
such as a kitchen measuring cup. Record the
fuel quantity.
5. After taking all measurements, return the fuel to
the vehicle’s gas tank.
Test Results
Consult the manufacturer’s specifications for re-
quired fuel delivery rate. If specifications are not
readily available, use the following table as a guide.
Engine Displacement Ozs. Collected
(CID) (30 seconds)
Up to 225 8
225 to 350 11
Over 350 16
If the above conditions are not met, replace or
repair the defective components.
TO
FUEL
TANK
CARBURETOR
CONNECTION Fig. 11
4
5
6
Fig. 12
Customer Service
For product information or customer service
please call 1-800-ACTRON-7 (1-800-228-7667)
Monday through Friday, between 8:30 a.m. and
4:30 p.m. Eastern time or fax anytime at
(216) 651-2388.
Actron can also be reached by Email or on the
Internet.
Email address: [email protected]
Internet home page: http://www.actron.com
One Year Warranty
If within one year from the date of purchase this
equipment fails due to defect in materials or work-
manship, return it to Actron and Actron will repair it
free of charge.
This warranty gives you specific legal rights, and you
may also have other rights which may vary from state
to state.
Actron Manufacturing Company
9999 Walford Avenue
Cleveland, Ohio 44102-4696
®
©1997 Actron Manufacturing Company. Sunpro is a
registered trademark of Snap-On Tools Company and is
used under exclusive license.
2-202002
3
2
1
3. Hold the vacuum gauge with rubber universal
adaptor firmly over the valve cover hole or filler/
breather cap opening.
A. A properly working PCV system will draw a
vacuum of about 3 to 5 inches within 10 seconds.
B. If there is very little or no change in the
gauge reading in the first 10 to 15 seconds of
the test the PCV valve is clogged or frozen, or
there is excessive air leakage in the vacuum
hose between the intake manifold and PCV
valve (or other leakage into the crankcase).
4. Repair or replace the defective parts as needed
and reconnect hoses.
DISTRIBUTOR VACUUM
ADVANCE MECHANISMS
The amount of spark ignition advance needed is
determined by the intake manifold vacuum and
engine speed.
The vacuum advance mechanism in the distributor
is connected to the intake manifold or carburetor by
a rubber hose. To measure the amount of vacuum
at any RPM, disconnect the hose from the distribu-
tor and insert a “Tee” connector (Item 4, Figure 12)
in line with this hose and another back to the
distributor as shown in Figure 9. Also, connect the
gauge to the “Tee” as shown.
NOTE: The vacuum reading can appear to be
normal during the above tests while the advance
mechanism is defective; that is, frozen due to rust,
dirt or corrosion.
FUEL PUMP TESTING
CAUTION: Use extreme care in disconnecting
fuel lines. Catch all gasoline in a container and
discard. Leaking gasoline is a serious fire
hazard.
Initial Inspection
Before testing, check tightness of all fittings and
connections.
Check the rubber fuel lines at the fuel pump for
deterioration, such as splitting, cracking and
spongyness.
If leaks are evident in lines or fittings, repair or
replace as necessary. If leakage is detected in the
pump at the diaphragm flange, in the sheet metal
cover, or in casting breather holes, replace the
fuel pump. Check fuel level and remove any kinks
in the fuel line. It is not necessary to remove the
fuel pump for any of these inspections.
Procedure
1. Disconnect the fuel line between the fuel pump
and the carburetor and attach the vacuum gauge
hose to the fuel line, using adaptors as neces-
sary. (See Figure 10).
NOTE: The fuel in the carburetor fuel bowl will be
sufficient to run the engine for these tests.
2. Operate the engine at idle. Hold gauge at
carburetor height and note the reading. Stop
engine and re-connect fuel line.
Test Results
Compare the observed reading with the
manufacturer’s specifications. If specifications are
not immediately available, fuel pump pressure
can be considered satisfactory if it is between 4
and 6 PSI, with lower readings for smaller dis-
placement engines. If pressure reading falls out-
side this range, consult the manufacturer’s speci-
fications before replacing the fuel pump.
MANIFOLD VACUUM
CONNECTION
TO
FUEL
TANK
Fig. 10 CARBURETOR
CONNECTION
Fig. 9
ALTERNATE VACUUM
CONNECTION ON CARBURETOR
Test Results
On many systems, little or no vacuum is applied to
the distributor at idle; as the throttle is opened wider
(engine RPM increases), the vacuum gradually in-
creases. The manifold vacuum drops when the en-
gine is accelerated in proportion to the amount of
throttle advance. The gauge should read between
18 and 21 for normal engines. Check vehicle manual
for your car for proper value.
If the vacuum gauge does not change or changes very
little with a change in RPM as described above, the
vacuum hose may be open or cracked, or the diaphram
in the advance mechanism may be punctured.
Vacuum & Pressure Tester Kit
Repair Parts
Key
No.
Part No. Description
1 31-269 Vacuum and Pressure Gauge
2 400-384 Black Rubber Hose for air
and fuel (24")
3 1000-1113 Universal Adapter –
Fuel line, air and PVC
4 400-810 "Tee" Fitting
5 400-819 Tapered Hose Adapter
6 180-784 1/8 NPT X 0.187 Barb
2-202002 Instruction Manual