Question about 1989 Toyota Cressida
Where was the oil? On the electrode in the combustion chamber? Or was
it on the top of the plug where the spark plug wire connects to it? If
the latter scenario is the case, then it's probably the spark plug tube
seals at the valve cover. These dry up and get compressed over time and then fail to seal. Try replacing these first and clean up any oil.
Recheck the plugs after a week or two. If there's still oil, then you
may need the lower spark plug tube seals.
These lower seals go between the cam towers and the cylinder head. If you wind up replacing these, then you should probably put in a new cam seal as well. Check the factory service manual for the proper torque specs on the cam tower bolts. It's also helpful to back off the valve adjustment screws until they're flush with the bottom of the rocker arms. This helps prevent the screws from catching on the top of the valve stems and bending a valve when you're putting the rocker arm assembly back on the head.
Posted on Sep 05, 2009
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Posted on Jan 02, 2017
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