Now with Distributor-Less Ignition (DIS) that happens even less. The risk of washing out the engine is water in the ignition. With a shiny clean engine, that you check after each drive, its a lot easier to spot leaks at their source instead of their end-point. It always help to thoroughly clean the engine, like spray it down with Simple Green or another De-Greaser, even scrub built up deposits with a brush and hose it completely, then let dry. Pretty much what IC and others said before, I had to add the collecting and dripping from the lowest point, to make sure if you hadn't consider it yet, you would.
So, its easy to mistake the point where leaking fluid is collecting and dripping from as the source of the leak itself, when in reality it could be somewhere else because you're missing the clues. Often the lowest point on the engine/trans is the bottom of the bellhousing (becoming less and less so in more modern designs). The rear cam journal soft plug at the rear of the block is less common, but still a possibility.Īny leaking fluid "tends" to pool at the lowest point, and then drip off from there. The intake manifold rear gasket is also common. The oil sender from up top next to the distributor is a common leaker. Oil will tend to leak downwards from gravity and rearwards from road draft. Of course with a lot of miles, anything is possible. Many oil leaks can look like a rear main leak and it is usually the first thing people think of, but in the big picture, it isn't all that common. Interdynamics Oil and Fuel Systems UV Dye (1 oz.) 374CS: Advance Auto Partsīe careful in diagnosing a suspect rear main leak. If the oil is too clean to see the definite leak source or leak drip/spray pattern, a UV dye and light can help make it more visible. Does the flex plate appear to be flinging the oil around the inside of the bell-housing? The rear main seal service procedure is shown on p. Study the 'Rear seal area leaks-Inspection' procedures on p.
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