Question about 2002 Ford Expedition
Really light smoke often appears blue. That light blue smoke as well as white smoke is oil smoke. (That is why some people will insist that oil smoke is blue...)
That is oil that has seeped into the combustion process. That most often is valve-stem seals/valve guides. The oil under the valve covers on top of the heads runs down the valve stem as the engine sits. (It is pretty unlikely that oil would seep up, past the rings...)
If that is the case, removing the heads and having the valve guides really fixed is the best solution.
You can inspect this problem without that level of disassembly, though.
After removing the valve covers and spark plugs.
Turn the engine to get a piston near TDC (but not quite at TDC). You don't want the vale to be able to drop into the cylinder, but you want a little room between the valve and the piston top.
There is a type of valve spring compressor that has a pair of prongs that grip the spring, with a hand-wheel on top to push down on the retainer.
Use a valve spring compressor like that to remove the valve-spring-retainer keepers, the valve-spring retainer and the valve spring(s) from 1 valve. Check the side to side play to see how the guide is. Check the condition of the seal. Check all the valves this way, unless you find right away that there is enough wear that rebuilding and reconditioning the head is necessary.
Posted on Jul 06, 2010
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Posted on Jan 02, 2017
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