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is this engine blown?

To: <datsun-roadsters@autox.team.net>
Subject: is this engine blown?
From: "Daniel Neuman" <neuman@RadOnc17.UCSF.Edu>
Date: Tue, 30 Dec 2003 14:04:27 -0800
Hello All,
        I need y'alls collective engine wisdom.  On xmass day we were
cruising to the big family gathering in Irene's Jag- the one with the
350/350 combo.  Something must of happened along the way and it started to
overheat...I watched the oil pressure go from 40-20-10-ish as I was
attempting to make it to an off ramp.  
        Had the car towed home and checked it out over the weekend.  The oil
was really really foul-burnt nasty smelling.  I changed the oil and the
coolant and the plugs and started the car up.  It started up fine and at
idle it sounded a little noisy like a rocker arm was not adjusted correctly.
When I rev'd it up above idle it starts to make a horrible racket and there
is no oil pressure showing on the gauge.  If I had to guess I would say the
racket is coming from the lower part of the engine.  I popped the valve
covers off and the rocker arms and pushrods look okay.  
        What do you guys think is wrong?  Did I destroy the crankshaft
bearings?  The engine is not leaking oil why do I not have any oil pressure?
        Thanks,
                Daniel Neuman
                Oakland CA
                69 2000 (which still runs great)





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