Timing-cover oil seals dependable performance

Timing-cover oil seals

A common source of leakage is the timing-cover oil seal at the crankshaft-pulley end of the engine. Generally, oil leaks most from the seal when the engine is running fast, less when it is idling.

Tighten the central bolt sufficiently to compress the gasket.

Tighten the central bolt sufficiently to compress the gasket.

Check for signs of oil sprayed out sideways in line with the oil seal or pulley on to adjacent parts of the bodywork or engine.

Look also at the underside of the engine beneath the seal, and on the sump pan for oil streaks starting at the lower edge of the seal.Timing-cover oil seals dependable performance.

The only cure for a leaking oil seal is replacement, and ensuring that the rotating parts with which it is in contact are smooth and free of burrs or raised metal.

If an engine needs topping up with fresh oil more than usual, or if you see a pool of oil under the engine where the car has stood, there is an oil leak. Trace the source immediately.

The engine could be damaged if the leak is allowed to become serious.

Finding the exact source of the leak is easier if you first clean the outside of the engine thoroughly with a proprietary degreasing fluid and a stiff bristle brush. Protect electrical parts with plastic bags, or plastic sheets held on by sticky tape, then hose the degreaser away with water until the engine is reasonably clean and oil-free. Leaking oil then shows clearly. Timing-cover oil seals dependable performance.