Compression Pressure Limit Chart
NOTE:
The indicated compression pressures are considered within specification if the lowest reading cylinder is at least 75% of the highest reading. Refer to the Compression Pressure Limit Chart.
| Maximum Cylinder Pressure - Minimal Cylinder Pressure | Maximum Cylinder Pressure - Minimal Cylinder Pressure | Maximum Cylinder Pressure - Minimal Cylinder Pressure | Maximum Cylinder Pressure - Minimal Cylinder Pressure |
|---|---|---|---|
| 134.0 -100.9 psi (924 -696 kPa) | 164.0 -123.0 psi (1, 131 -848 kPa) | 194.1 -145.0 psi (1, 338 -1, 000 kPa) | 223.9 -168.0 psi (1, 544 -1, 158 kPa) |
| 136.0 -102.0 psi (938 -703 kPa) | 166.1 -124.0 psi (1, 145 -855 kPa) | 195.9 -147.1 psi (1, 351 -1, 014 kPa) | 226.0 -169.0 psi (1, 558 -1, 165 kPa) |
| 138.1 -104.0 psi (952 -717 kPa) | 168.0 -126.0 psi (1, 158 -869 kPa) | 198.0 -147.9 psi (1, 365 -1, 020 kPa) | 228.0 -171.0 psi (1, 572 -1, 179 kPa) |
| 140.0 -105.0 psi (965 -724 kPa) | 170.0 -127.1 psi (1, 172 -876 kPa) | 200.0 -150.0 psi (1, 379 -1, 034 kPa) | 230.0 -172.0 psi (1, 586 -1, 186 kPa) |
| 142.0 -107.0 psi (979 -738 kPa) | 172.0 -128.9 psi (1, 186 -889 kPa) | 201.9 -151.0 psi (1, 392 -1, 041 kPa) | 232.1 -174.0 psi (1, 600 -1, 200 kPa) |
| 143.9 -108.1 psi (992 -745 kPa) | 174.0 -131.0 psi (1, 200 -903 kPa) | 204.1 -153.0 psi (1, 407 -1, 055 kPa) | 233.9 -175.1 psi (1, 613 -1, 207 kPa) |
| 146.1 -109.9 psi (1, 007 -758 kPa) | 176.1 -132.0 psi (1, 214 -910 kPa) | 206.0 -154.0 psi (1, 420 -1, 062 kPa) | 236.0 -176.9 psi (1, 627 -1, 220 kPa) |
| 147.9 -111.0 psi (1, 020 -765 kPa) | 178.0 -133.0 psi (1, 227 -917 kPa) | 208.0 -155.9 psi (1, 434 -1, 075 kPa) | 238.0 -178.0 psi (1, 641 -1, 227 kPa) |
| 150.0 -113.0 psi (1, 034 -779 kPa) | 180.0 -135.0 psi (1, 241 -931 kPa) | 210.0 -157.1 psi (1, 448 -1, 083 kPa) | 240.0 -180.0 psi (1, 655 -1, 241 kPa) |
| 152.0 -114.0 psi (1, 048 -786 kPa) | 182.0 -135.8 psi (1, 255 -936 kPa) | 212.0 -157.9 psi (1, 462 -1, 089 kPa) | 242.1 -181.0 psi (1, 669 -1, 248 kPa) |
| 154.0 -115.0 psi (1, 062 -793 kPa) | 184.1 -138.1 psi (1, 269 -952 kPa) | 214.1 -160.0 psi (1, 476 -1, 103 kPa) | 244.0 -183.0 psi (1, 682 -1, 262 kPa) |
| 156.1 -117.0 psi (1, 076 -807 kPa) | 185.9 -140.0 psi (1, 282 -965 kPa) | 216.0 -162.0 psi (1, 489 -1, 117 kPa) | 246.0 -184.1 psi (1, 696 -1, 269 kPa) |
| 157.9 -118.1 psi (1, 089 -814 kPa) | 188.0 -141.0 psi (1, 296 -972 kPa) | 218.0 -163.0 psi (1, 503 -1, 124 kPa) | 248.0 -174.3 psi (1, 710 -1, 202 kPa) |
| 160.0 -119.9 psi (1, 103 -827 kPa) | 190.0 -142.0 psi (1, 310 -979 kPa) | 220.0 -165.1 psi (1, 517 -1, 138 kPa) | 250.0 -187.0 psi (1, 724 -1, 289 kPa) |
| 161.0 -121.0 psi (1, 110 -834 kPa) | 192.0 -144.0 psi (1, 324 -993 kPa) | 236.6 -166.1 psi (1, 631 -1, 145 kPa) | 251.9 -189.0 psi (1, 737 -1, 303 kPa) |
If one or more cylinders reads low, squirt approximately one tablespoon of engine oil meeting Ford specification on top of the pistons in the low-reading cylinders. Repeat the compression pressure check on these cylinders.