Thread: Oil leak
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Old 02-22-2015, 03:46 PM   #3
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I'd check first to see if you can narrow down what part of the engine you see the leaking at. If I couldn't determine that, then I look at the oil drain plug and oil filter, I've found those loose on a couple cars I've had. If that looks okay, then there are a couple common oil leaks on these Supras. Check on the exhaust side of the engine just below the distributor. Lots of oil there? Likely a bad o-ring around the distributor shaft. Remove distributor, replace o-ring, reinstall distributor, and reset ignition timing. Another common oil leak is the no. 3 cylinder head cover. This is the piece that runs the length of the engine between the valve covers, that the spark plug wires clip into. This cover doubles as a gasket for 4 oil passages across the cylinder head. When these leak, which they almost always do, you usually find lots of oil on your spark plug wires, and it can get bad enough to cause misfires if left unchecked. You likely won't see the oil until you pull a spark plug boot out and fling oil everywhere. This piece is fairly straightforward to replace after removing the throttle body, intake pipe, and spark plug wires. Remove it by removing the 4 oil plugs holding it in, they use a 14mm hex key or Allen wrench. If it was leaking, you should replace your spark plug wires and possibly spark plugs as well. Also, since you're already torn down this far, its not a bad idea to replace the valve cover gaskets as well, as they tend to leak a little oil with age.
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