What Is Chainsaw Compression Tester?

Chainsaws powered by two-stroke gas have fewer moving parts than other types. A vacuum pressure or compression is created in the engine by the explosion and movement of the crankshaft.

Insert the spark plug hole with the compressed air and insert the compression gauge hose. Start the engine and pull the starter cord 10 to 15 times, or until the compression gauge needle reaches its maximum setting. It is recommended that compression be at least 90 PSI when it is hot and 100 PSI when it is cold.

To put it another way, how much compression do I need on my chainsaw? Their chainsaws should have a compression rating of at least 110 psi. The temperature of the tool can affect readings, as can the performance of specific engines or engines running at a higher or lower RPM. An engine that has been running for a while and is hot runs at a lower RPM than a chainsaw that is cold.

Keeping this in consideration, what causes too much compression in a chainsaw?

Compression issues are frequently fuel-related. When using yard equipment, old or contaminated fuel can lead to a slew of problems. Problems in gas lines and filters may cause excessive fuel, if this does not fix them. The tank is connected to the carburetor by a series of lines that return to the tank.

Crankcase movement and fuel explosion in a chainsaw’s combustion chamber produce the compression necessary for operation. The crankshaft’s explosion and movement create vacuum or compression pressure in the engine.

Check the Starter

Compression changes can result in a variety of issues, ranging from minor power reductions to a complete engine shutdown. As a result, other engine components must be ruled out before compression is identified as the problem’s root cause. For compression to be generated, the starter must spin properly. The starter includes the starter rope, pulley, recoil spring, and flywheel. Remove the starter assembly from the chainsaw’s side by unscrewing and removing the screws. Disassemble the starter parts and look for any damage.

Quick Compression Test

To find out if compression is dropping or increasing after checking the starter assembly’s function, the operator can move on to the next step. One more quick compression test will reveal whether or not your problem is due to compression in the first place. Place the chainsaw on the ground and begin to cut the tree down. Take the starter rope handle off the chainsaw and raise it off the ground. It’s possible that the compression is low if the rope is sluggish when being pulled.

Checking Compression Levels

A more detailed test is required if the operator has reason to believe that compression is being lost. A compression gauge, which measures engine pressure similarly to a tire gauge, is installed in the engine. The spark plug hole serves as the connection between the compression gauge and the cylinder. The starter rope should be pulled to exhaustion until the compression gauge reaches its maximum value. Compression readings of 100 to 160 psi work well for most chainsaws.

Compression Repair

Compression repairs can be difficult, so the operator must be able to determine with precision if compression is the source of the problems. Compression issues are typically the result of an air leak somewhere within the internal engine, most commonly around the crankshaft’s gaskets and seals. If any of these components are damaged or cracked, the entire engine will have to be disassembled to address the issue. Do not attempt these repairs on your chainsaw if you are unsure about your ability to do so safely. Improper repairs could result in engine damage.

Recommended Readings (Power Tools Bible)

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