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Sunday, October 10, 2010

327 - Gentlemen, Start Your Engine - Strike 2

Dennis K., Max H. and Ty came over today to help with the second attempt to start our 327.  We started the day very optimistic but we were soon disappointed.  We believe we still have a fuel problem.


We looked at everything that had anything to do with fuel.  In this short video Max is simulating manifold vacuum to push gas through the injectors, Ty is running the starter and coil wire, I am running a drill motor to turn the high pressure fuel pump, and Dennis is spraying starting fluid and running the throttle.  It was pretty comical and we did laugh about it, but the engine did run for a few seconds.  We all agreed it was lack of fuel. 


We examined the fuel line from the primary fuel pump up to the fuel injection unit and it was dry.  Max and Dennis removed the fuel lines and the primary fuel pump for further inspection.  The pump was bench tested and it worked fine.  Something else was wrong.


The culprit was a bent fuel pump push rod.  You can see the bend when it's put against a straight edge.   The push rod was wedged in the block which means it wasn't functioning.  Fortunately Dennis had a spare one and now the pump works perfect.  We tried a couple more attempts to start the motor  but now we have too much fuel.  We decided to give the battery and the starter a rest and try it again in a few days. 


Ty and I spent the rest of the day installing the drive shaft and shift linkage.  When we were finished we looked for something else to do and there was nothing.  The rolling chassis is done!  We couldn't believe it.


The next post will be an update on the fuel injection unit.  I was able to find a new spill plunger and it should arrive in a few days.  I'll replace the one we repaired last week and take another look at all the vacuum connections and diaphragms.  Ty took several of my fuel injection books home with him so hopefully we can noodle our way to a running motor.  Stay tuned for more.  Thanks for watching.

Thursday, October 7, 2010

327 - Fuel Issue - Solved!

After our first attempt to start our 327 failed, I went hunting for the problem.  I removed the fuel meter from the FI assembly then removed the spill plunger.  The loose pieces you see make up the spill plunger.  As you recall, the spill plunger regulates fuel flow by diverting recirculating gas to the fuel injectors.


This is a diagram of the spill plunger.  It's a very simple unit with only two moving parts.  The top two.


This is a picture of our spill plunger sitting adjacent to the pieces on the diagram.  Look close and you'll see that we are missing the critical piece that actually diverts the fuel.  The valve face is the second piece from the top.


Since I can't go to Napa and buy this piece I decided to make one.  The one I am holding was reduced in size a little bit more before it was installed.


Here it is installed in the spill plunger body.


The following is a 2 minute video of the spill plunger bench test.  If you have a slow connection you may want to pass on the download.

It was a streaming success!!