Generac Power Systems TXP - Manual (Page 36)

A. ) Use a standard compression gauge.
Insert end of gauge into spark plug
hole. Open throttle wide open and
crank the engine. Repeat compression
check for second cylinder. There
should be no more than a 25 per cent
difference in compression between
the two cylinders. A greater pressure
difference indicates loss of compress­
ion.
RESULTS: 1.) Compression Low...........................Go to
Paragraph ’’B”
2.) Compression Good....Go to
Test 29
B. ) Squirt a few drops of oil into the
spark plug opening of one cylinder.
Repeat compression Test of Paragraph
’’A” above. If compression is higher
than was obtained in "A”, RING or CYL­
INDER wear is indicated. If little or
no difference in compression is noted,
compression loss is due to a leaking
HEAD GASKET, FAULTY VALVES, etc.
TEST 24 -
COMPRESSION
Repeat Paragraph "B" for second cylinder,
RESULTS: 1.) Compression Increased,.Go
to Test 27 and 28
2.) No increase........................................ Go
to Tests 25 and 26
TEST 25
HEAD GASKET
Refer to ENGINE REPAIR section of this Manual.
TEST 26
VALVES
Refer to ENGINE REPAIR section of this Manual.
TEST 27
RINGS
Refer to ENGINE REPAIR section of this Manual.
TEST 28
CYLINDER
Refer to ENGINE REPAIR section of this Manual.
COMPRESSION
GAUGE
SPARK PLUG
REMOVED
#
Issued 3-78
4.15