Learn to diagnose internal engine mechanical problems with minimal disassembly using basic engine mechanical testing.
Engine testing starts when you open the hood. And, The visible condition of the engine can tell you a lot about its performance.
Before you even think about doing engine testing, look for signs of leakage.
So, Engine mechanical problems can have many causes. Component wear is both normal and inevitable. Also, Anything with moving parts will wear with prolonged operation. This wear can occur sooner than expected if an engine is abused or is improperly maintained. Sealing gaskets can split or leak, internal engine parts such as piston rings, bearings, and valvetrain components can wear, and intake and exhaust valves can burn, just to note a few common examples.
Remove the air cleaner and check the condition of the filter. Examine the PCV valve and hoses for damage and wear. Also, Inspect the coil, distributor (if the engine has one), plug leads and terminals for carbon tracking and broken insulation.
Finally, Don’t forget to pull the dipstick and check the oil condition. Also look for oil leaks at valve covers and other seals.
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