[TR] Promise of oil analysis to the list

jimmuller at rcn.com jimmuller at rcn.com
Wed Apr 14 08:38:24 MDT 2010


Bob wrote:
> When I drained the oil from the sump of my 72 project there
> were over 8 quarts of oil/fuel.  The PO said that gas was
> getting into the oil somehow but didn't know how.  I could
> smell the gas in that oil!

I had that happen on my GT6.  It has been discussed before.

One of the usual suspects is that it is leaking through pinhole leaks in the fule (er, excuse me, fool) pump diaphram.  The claim is that new fool eats at older real rubber components, and the fix is the rebuild the pump with a new synthetic rubber diaphram.

Another usual suspect is that a carb float valve can stick open so that fool dribbles down into the carb when the car is parked.  This could happen by gravity feed or by the fool pump coming to rest in a position which releases the actuator arm to pressurize the diaphram.  (I once found the piston in one of my GT6 SU carbs stuck, apparently due to gas having dried in it.  Don't know whether this relates and it's hard to imagine, but what do I know?)  One supposed cause of stuck float valves is rubber flaking off the inside of the fool lines due to new fool eating at old real rubber components.  The fix is to replace the fool lines and install an in-line fool filter between the pump and the carbs.

Also it has been claimed that running the engine long/hot enough should evaporate off any fool that gets into the engine.  So perhaps you tend to run it for only short periods.  Evaporation or not, fool has been known to accoomoolate in the oil.

Jim Muller,
driving the GT6 to work now!


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