Re: [DMCForum] Re: tone L.O.C.

["Dave Stragand" <dave.stragand@xxxxxxxxxxxxxxx>]

For my DeSoto, the problem was more lack of oil pressure than lack of
compression (due to the hydraulic lifters not pumping up, which is not
applicable for a D).  I worked on the compression when I could see nothing
else below regular specs.  The engine should start and run on as low as
about 50 psi.  It won't run well, but under no load should at least fire.

If you're still experiencing a lack of oil pressure, this is something to
look at.  Mine comes up to at least about 40 psi (on a Midstate DMC
sender), but I would think it would be at least 10-20 on any sender.
Assuming you get the engine started due to some other reason, you will fry
it in short order if you have no oil pressure, so definitely keep an eye
on it.  Having thinned-out oil trapped in the pump -could- cause this, as
this type of pump requires the fluid it's pumping to be fairly viscous to
work correctly.  However, after cranking as much as you have, that should
not be an issue.

I'm forgetting exactly how the oil pump is driven, but I tend to remember
it's off of the distributor, correct?  If so, what you can do is put a
"priming tool" on it and turn it that way.  This is basically just a big
screwdriver blade on a drill -- you turn the pump in the normal direction
of rotation until the pressure comes up.  It may not help start the car,
but at least you'd know that your lubrication system is functioning
correctly.

You say you have a spark... but do you have all six sparks?  Here's how to
test:  Unhook the coil wire at the cap and hook it to a spark plug clamped
down to a ground on the engine.  Use your remote starter, and observe the
plug.  Do you see "spark spark...    spark spark...    spark spark"?  It
should be slightly uneven due to the odd-fire engine.  Also check that you
have the + and - on the coil correctly hooked up (you'll get a weaker
spark if not).

This is a simple one to keep in mind... but when you're back there with
the remote starter, you are leaving the key in the "on" position, right?
It won't start otherwise... been there, done that.  =)

-Dave
  ----- Original Message ----- 
  From: cruznmd 
  To: DMCForum@xxxxxxxxxxxxxxx 
  Sent: Sunday, August 03, 2003 8:52 PM
  Subject: [DMCForum] Re: tone L.O.C.


  --- In DMCForum@xxxxxxxxxxxxxxx, "Dave Stragand" <dave.stragand@xxxx> 
  wrote:
  >The speed of the engine, whether you cranked it with all of the 
  >spark plugs out, and whether you had the throttle wide open will all 
  play a part in the reading.  
  >  
  > At 100 psi on closed throttle, all other plugs in, you're just fine.
  >    
  > -Dave

  Ok, well as I've said, my engine isn't turning too fast and that 
  reduces the amount of volume so like the exhaust pressure, this may 
  have been somewhat reduced from the best it could be.

  I had all other plugs in, and closed throttle. The fuel was also 
  diabled so there was no fuel in the cylinder to take up space. 
  Afterwards, I realized that lack of fuel in the cylinder might also 
  slightly reduce pressure.

  -However-, Dave you said in your "DeSoto story" that you sent me, 
  that it took that engine 165 psi before it would run on it's own. I 
  realize we're looking at a world of difference in engines here, but I 
  didn't think 90-120 psi would be anywhere near enough.

  I also want to say that after putting some Marvel Mystery Oil in the 
  cylinders, and pulling the plugs, I spun the engine to work it in. 
  The engine cranked at -considerable- speed and yet I still have no 
  oil pressure. Could this be related?

  The oil pump worked perfectly when I tore the engine down, and I 
  didn't ever touch it. I never removed it, or it's chain or anything.

  It may have been totally drained since the oil was totally thinned 
  out by fuel. Would it have to be primed with oil?

[Non-text portions of this message have been removed]



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