Compression Tester:
A compression tester is a tool used to measure the compression pressure inside the cylinders of an internal combustion engine. This pressure is crucial for the proper functioning of the engine as it ensures that the air-fuel mixture is compressed adequately before ignition.
Technical Explanation:
Common Symptoms:
- Engine misfires
- Loss of power
- Excessive exhaust smoke
- Rough idling
- Poor fuel economy
Diagnosing: To diagnose potential issues with the engine's compression, a compression tester is used to measure the pressure in each cylinder. The tester is screwed into the spark plug hole, and the engine is cranked over to build up pressure. The gauge on the tester will display the compression pressure, which should be relatively consistent across all cylinders. A significant variation in pressure between cylinders could indicate problems such as worn piston rings, leaking valves, or a blown head gasket.
Common Repairs: Depending on the diagnosis, common repairs for low compression may include:
- Replacing piston rings
- Rebuilding cylinder head
- Resurfacing cylinder head
- Valve job
- Head gasket replacement
Regularly checking the compression of an engine can help identify potential issues early on and prevent more severe damage in the future.