Post Checks, Evaluation and Corrective Action
Post Checks, Evaluation and Corrective Action1. If test results indicate excessive oil consumption, carry out a cylinder compression test. The cylinder compression test should be carried out with a fully charged battery and all spark plugs removed see the Compression Test Chart.
2. Compression should be consistent across all cylinders.If compression tested within the specifications found in this information, the excessive oil consumption may be due to wear on the valve guides, valves or valve seals.
3. A cylinder leak detection test can be carried out using an Engine Cylinder Leak Detection Air Pressurization Kit. This can help identify valves, piston rings, or worn valve guides/valve stems, inoperative valve stem seals or other related areas as the source of oil consumption.
NOTE: An oil soaked appearance on the porcelain tips of the spark plugs also indicates excessive oil use. A typical engine with normal oil consumption will exhibit a light tan to brown appearance. See Spark Plug Analysis for details. A single or adjoining, multiple cylinder leak can be traced by viewing the tips.
4. If an internal engine part is isolated as the root cause, determine if the repair will exceed cost limits and proceed with a repair strategy as required.
5. Once corrective action to engine is complete and verifying that all pre check items were eliminated in the original diagnosis, repeat the Oil Consumption Test as described above and verify consumption results.