How Achieve You Close a Compression Check on a Boat Engine?
Learning determine a compression proof on an engine is an leading skill. When you purchase a boat and cannot satisfy it in the inundate for a proof propel, at the identical least a compression trial Testament helping hand you drive the context on the engine. When a boat you own is not running great, performing a compression probation Testament cinch provided you admit a earnest engine complication or whether you obligation to glimpse outside for your dilemma. Doing a compression research on an engine is not demanding and one man can easily complete it.
Prepare the Engine
Guide the engine for at least Thirty minutes. Whether you can carry the boat in baptize to place the engine under a "load," it improves the chances of an accurate reading. Do the same for each spark plug cylinder and write down the number for each.
Results
On two-cycle engines, the readouts should all be within a few psi of each other--no more than Fifteen psi difference between any of the cylinders. Keep the engine running until it is at normal operating temperature.Remove and Check Spark Plugs
Turn off the engine and take out all of the spark plugs. While the plugs are out, it is a great time to examine them for burns. The spark plug's correct color (after use) is tan and it should not have any burn marks, or charcoal coloring. If one or more sparkplugs is wet, shiny and black it is fouled by oil, gas, or both.
Attach the Compression Tester
Attach the good sparkplugs back on their wire. Lay them on the engine. Set throttle and choke open. Screw in the compression tester into one of the spark plug holes. Spin the engine throttle and read the tester. It will give you a readout of PSI (pounds of pressure per square inch). Whether you are on land, garner the engine at 1,200 rpms. This gets the choke opened up. Pay attention to the temperature gauge.
On four-cycle engines, the lowest number should be Seventy five percent of the highest reading.
Variables
Low battery power, a weak starter, or an engine that cools down before the testing is complete can corrupt the readings you get from a compression tester. A compression test is a useful gauge as a part of your engine diagnostics, but not as a single method of troubleshooting.
