Compression pressure depends on a lot of variables including head style, piston head design as well as wear. A C113 engine to have 102psi would have to have a 6.9 compression ratio which is possible for a factory original gas C113; i.e step head pistons with a gas head. That is 100% efficiency for a 6.9 CR. To estimate what a compression test reading should be, multiply the compression ratio for the engine as equipped (piston design and head)by 14.7 psi which is one atmosphere pressure and then multiply by about 90%. If I remember correctly, the old distillate engines had compression ratios less than 5 to 1. That would put the expected compression reading to be below 70 psi and that engine will run like a top.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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