eep UNIVERSAL SERl ES SERVICE MANUAL COMIPRESSION PRESSURE I IN I I CHART Maximum Minimum lwiaazncimum Minimum Pressure Pressure Pressure Pressure psi kg cm psi kg cm psi kg cm psi kg cm 134 9 42 101 7 10 188 13 22 141 9 91 136 9 56 102 7 17 190 13 36 142 9 98 138 9 70 104 7 31 1 92 13 50 144 10 12 140 9 84 105 7 38 194 13 64 145 10 19 142 9 98 107 7 52 196 13 78 147 10 33 144 10 12 108 7 59 198 13 92 148 10 40 146 10 26 110 7 73 200 14 06 150 10 55 148 10 40 111 7 80 2012 14 20 151 10 62 150 10 55 113 7 94 204 14 34 153 10 76 152 10 68 114 8 01 206 14 48 154 10 83 154 10 83 115 8 08 20113 14 62 156 10 97 156 10 97 117 8 23 210 14 76 157 11 04 158 11 11 118 8 30 2122 14 90 158 11 11 160 11 25 120 8 44 214 15 04 160 11 25 162 11 39 121 8 51 216 15 18 162 11 39 164 11 53 123 8 65 218 15 32 163 11 46 166 11 67 124 8 72 1220 15 46 165 11 60 168 11 81 126 8 86 222 15 61 166 11 67 170 11 95 127 9 83 224 15 75 168 11 81 172 12 09 129 9 07 226 15 89 169 11 88 174 12 23 131 9 21 228 16 03 171 12 02 176 12 37 132 9 28 230 16 17 172 12 09 178 12 51 133 9 35 232 16 31 174 12 23 180 12 65 135 9 49 234 16 45 175 12 30 182 12 79 136 9 56 236 16 59 177 12 44 184 12 94 138 9 70 238 16 73 178 12 51 186 13 08 140 9 84 b Daulntlesas V 6 Engine Example To check tl1e engine cylinder compression use the Cylilndier No 1 2 3 4 5 6 following procedures Pressure psi 129 135 140 121 120 10 0 F rm1y insert 0mPF i0 t l g 1 Spafk plug Seventy five percen1 of 1 4O highest is 105 Thus POW F1g C 10 Crank gm Fh1 0 L gll 1 at least OUT Cylinder No 6 is less than seventy five percent compression strokes to obtain highest possible of Cylinder No 3 This condition accompanied lby Y 3d1 C low speed missing indicates an improperly seated Chec1 compression of eachlcylinder Repeat com valve Op wom O broken piston I ing pressioin checkdanddrecord highest reading obtained If one 0 more cylinders read IOW inject about LE E 2 a tablespoon of engine oil on top of pistons in low NOTE The recorded compression pressures are to read mg C ylmd i through spark plug pOI t Repeat be considered normal if the lowest reading cylinder eemF reS Sl m check en these eYlmde S ig more them seveniiyjive percent Of the highest If compression improves considerably rings are reading cylinder See the following example and worn If compression does not improve valves are the Compr ession Pressure Limit Ch art sticking or seating poorly If two adjacent cylinders indicate low compression Z H and injecting oil does not increase compression the c cause may be a head gasket leak between the 1 cylinders Engine coolant and or oil in cylinders it i g iX coulcll result from this defect cg li i ig 2 g i i A i l ek A V K r v g sg e w r Wj x v v 8 T manu r i e 1 f j j j j t E V def lnln E s 2 2 1 j 2 E H V 4 N w Zi V M V V l 5 I i i Q t FIG C 10 CHECKING ENGINE CYLINDER FIG C 11 CON I A CT POINTS IVIATERIAL COIMPRESSION DAUNTLESS V 6 ENGINE TRANSFER 25