Actron Automobile Accessories CP7821 User Manual

6. On a normal cylinder, the  
needleshouldadvanceoneach  
stroke until it reaches a peak.  
All cylinders should test within  
the engine manufacturer's  
specifications and readings  
shouldnotvarymorethan10%  
from cylinder to cylinder.  
9. If a reading on two adjacent  
cylinders is 20 pounds or more  
lower than the rest of the cylin-  
ders, a defective head gasket  
is indicated.  
®
CP7821  
150  
10  
120  
180  
210  
240  
90  
60  
30  
12  
14  
8
6
4
16  
18  
20  
2
270  
300  
0
kPa x 100  
COMPRESSION  
TESTER  
0
10. If readings are low or un-  
even between cylinders, pour  
a teaspoon of S.A.E. #30 oil  
into each cylinder and retest. If  
the readings increase consid-  
erably,thefaultispoorlyseated  
or worn rings. If the readings  
remain about the same, the  
valves are at fault.  
Compression  
Tester  
7. If the needle fails to advance  
normallyorifitremainsthesame  
for several strokes and then  
startstoclimb,thecylinderhasa  
sticking valve.  
8. If the compression reading is  
15 or more pounds above the  
manufacturer'sspecification, it  
is indicative of carbon build-up  
in the cylinder.  
11. When tests are completed,  
put the spark plugs back in the  
engine and return the high ten-  
sion lead to the center of the  
distributor. Unblockthethrottle  
and replace the air filter.  
INSTRUCTIONS  
3. Remove the air filter and block  
open the carburetor throttle  
plates to maximum. Remove  
the high tension lead from the  
center of the distributor and  
ground it.  
Before making this test it  
is a good practice to check  
and be sure that all  
cylinder head bolts are  
tightened to the engine  
manufacturer's torque  
specifications.  
Customer Service  
One Year Warranty  
For product information or customer ser-  
vice please call 1-800-ACTRON-7 (1-800-  
228-7667) Monday through Friday, be-  
tween 8:30 a.m. and 4:30 p.m. Eastern  
time or fax anytime at (216) 651-2388.  
If within one year from the date of pur-  
chase this equipment fails due to defect in  
materials or workmanship, return it to  
Actron and Actron will repair it free of  
charge.  
1. Run the engine for about 15  
minutes until it reaches normal  
operating temperature.  
Actron can also be reached by Email or  
on the Internet.  
This warranty gives you specific legal  
rights, and you may also have other rights  
which may vary from state to state.  
2. With the engine off, loosen all  
spark plugs about one turn,  
then use an air hose to blow all  
the dirt out of the spark plug  
wells. Then remove all of the  
sparkplugsandgaskets.Place  
them on a clean flat surface in  
the order in which they were  
removed. This will help to cor-  
relate any compression prob-  
lem with the condition of the  
plug from the particular cylin-  
der involved.  
Email address: [email protected]  
Internethomepage: http://www.actron.com  
4. Hold the compression tester in  
the spark plug hole and crank  
the engine for at least 4 com-  
pression strokes or until pres-  
sure stops rising on the tester.  
®
Actron Manufacturing Company  
9999 Walford Avenue  
Cleveland, Ohio 44102-4696  
5. Record the compression read-  
ing and repeat the test on all  
remaining cylinders.  
©1997 Actron Manufacturing Company. Sunpro is a regis-  
tered trademark of Snap-On Tools Company and is used  
under exclusive license.  
2-202103  
 

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