For example, one higher cranking compression pulse followed by two lower cranking compression pulses followed by another higher cranking compression pulse followed by two lower cranking compression pulses strongly suggests the failure of one apex seal, corner seal, and/or side seal set. ![]() On the other hand, if the cranking compression increases or decreases in erratic steps there is a fault with one or more seals in that rotor. If you see an increase in the cranking compression reading in increments that become smaller at a uniform rate, this indicates even compression on all sides of that rotor. Insert the gauge in the remaining leading spark plug hole and repeat the test procedure. Repeat the test on this chamber at least once more to confirm your readings. Insert a compression gauge (if so equipped, disable the gauge's feature which retains the highest reading) into one of the leading spark plug holes and crank the engine long enough to obtain at least eight (8) compression pulses. First, crank the engine with the throttle wide open to purge the housings of any liquid. Unless you are able to start the engine using a remote engine starter, have an assistant crank the engine during the test. Next, remove the leading spark plugs (bottom plugs) only. Remove all four spark plug wires to prevent the engine from firing. Testing the cranking compression with the engine cold will most likely produce a false (higher than correct) reading. To properly test the engine's cranking compression pressure the battery must be fully charged, the starter in good condition, and the engine must be at normal operating temperature. An excess of liquid or a cranking speed that is either too slow or too fast will give incorrect readings. Two major factors to consider when performing a compression test are the presence of liquid (water, fuel, or oil) around the seals, and the cranking speed of the engine. While not infallible, this test can offer a good indication of the general condition of each rotor's apex, corner, and side seals. A compression test can be used to determine the condition of the apex, corner, and side seals of the rotary engine.Ī key step in determining overall rotary engine health is measuring the engine's cranking compression in the rotor chambers.
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