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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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