Engine distributors DSG-423 User Manual

DSG-423 GENERAL INFORMATION
01-12
Compression Tests
Compression Gauge Check
1. Make sure the oil in the crankcase is of the correct
viscosity and at the proper level and that the battery
is properly charged. Operate until the engine is at
normal operating temperature. Turn the ignition
switch to the OFF position, then remove all the spark
plugs.
2. Set the throttle plates in the wide-open position.
3. Install a Compression Tester such as Rotunda
Compression Tester 059-R0009, or equivalent, in
the No. 1 cylinder.
4. Install an auxiliary starter switch in the starting
circuit. With the ignition switch in the OFF position,
and using the auxiliary starter switch, crank the
engine a minimum of five compression strokes and
record the highest reading. Note the approximate
number of compression strokes required to obtain
the highest reading.
5. Repeat the test on each cylinder, cranking the
engine approximately the same number of
compression strokes.
Test Results
The indicated compression pressures are considered
within specification if the lowest reading cylinder is
within 75 percent of the highest reading. Refer to the
Compression Pressure Limit Chart.
If one or more cylinders reads low, squirt approximately
one tablespoon of clean engine oil meeting Ford
specification ESE-M2C153-E on top of the pistons in
the low-reading cylinders. Repeat the compression
pressure check on these cylinders.
Example Readings
If, after checking the compression pressures in all
cylinders, it was found that the highest reading obtained
was 1351 kPa (196 psi), and the lowest pressure
reading was 1069 kPa (155 psi), the engine is within
specification and the compression is considered
satisfactory.
Interpreting Compression Readings
1. If compression improves considerably, with the
addition of oil, piston rings are faulty.
2. If compression does not improve with oil, valves are
sticking or seating improperly.
3. If two adjacent cylinders indicate low compression
pressures and squirting oil on each piston does not
increase compression, the head gasket may be
leaking between cylinders. Engine oil or coolant in
cylinders could result from this condition.
Use the Compression Pressure Limit Chart when
checking cylinder compression so that the lowest
reading is within 75 percent of the highest reading.
Compression Pressure Limit Chart
MAX-MIN
kPa (psi)
MAX-MIN
kPa (psi)
MAX-MIN
kPa (psi)
MAX-MIN
kPa (psi)
924 - 696
(134 - 101)
1131 - 848
(164 - 123)
1338 - 1000
(194 - 146)
1154 - 1158
(224 - 168)
938 - 703
(136 - 102)
1145 - 855
(166 - 124)
1351 - 1014
(196 - 147)
1558 - 1165
(226 - 169)
952 - 717
(138 - 104)
1158 - 869
(168 - 126)
1365 - 1020
(198 - 148)
1572 - 1179
(228 - 171)
965 - 724
(140 - 106)
1172 - 876
(170 - 127)
1379 - 1034
(200 - 150)
1586 - 1186
(230 - 172)
979 - 738
(142 - 107)
1186 - 889
(172 - 129)
1303 - 1041
(202 - 151)
1600 - 1200
(232 - 174)
933 - 745
(144 - 109)
1200 - 903
(174 - 131)
1407 - 1055
(204 - 153)
1055 - 1207
(153 - 175)
1007 - 758
(146 - 110)
1214 - 910
(176 - 132)
1420 - 1062
(206 - 154)
1627 - 1220
(154 - 177)
1020 - 765
(148 - 111)
1227 - 917
(178 - 133)
1434 - 1075
(208 - 156)
1641 - 1227
(238 - 178)
1034 - 779
(150 - 113)
1241 - 931
(180 - 135)
1448 - 1083
(210 - 157)
1655 - 1241
(240 - 180)
1048 - 786
(152 - 114)
1225 - 936
(182 - 136)
1462 - 1089
(212 - 158)
1669 - 1248
(242 - 181)
1062 - 793
(154 - 115)
1269 - 952
(184 - 138)
1476 - 1103
(214 - 160)
1682 - 1262
(244 - 183)
1076 - 807
(156 - 117)
1282 - 965
(186 - 140)
1489 - 1117
(216 - 162)
1696 - 1269
(246 - 184)
1089 - 814
(158 - 118)
1296 - 972
(188 - 141)
1503 - 1124
(218 - 163)
1710 - 1202
(248 - 186)
1103 - 872
(160 - 120)
1310 - 979
(190 - 142)
1517 - 1138
(220 - 165)
1724 - 1289
(250 - 187)
1110 - 834
(161 - 121)
1324 - 993
(192 - 144)
1631 - 1145
(222 - 166)

Engine distributors DSG-423 Specifications

General

Brand	Engine distributors
Model	DSG-423
Category	Engine
Language	English