Re: Oil Pressure

["Myron Ware" <cmw@domain.elided>]

Richard,
  I had trouble believing my guage as well (4-cyl 152).  I put a 
pressure guage directly on the engine where the oil pressure sending 
unit screws in, and found that when idling cold, there was much 
greater pressure (I guess from the oil being thicker) than I 
expected, and as the truck warmed up, the pressure went down to 
normal for idle.  When the revs are brought up once it's warm, the 
pressure on the guage corresponded to the service manual specs.  You 
might try a glycerin filled pressure guage like I did.  I mounted 
mine on a "T" with the oil sender so I can have my dash guage as well 
as the mechanical guage to peek at if something seems odd.
HTH,
Myron

Original message:
> I have a 74 Scout II with an oil pressure problem.  I have a 345 V-8.  
> When I start the vehicle (cold), the engine pressure goes to around 
> 3700.  As soon as the engine starts warming the pressure drops. It 
> soon drops to almost zero.  It will raise some as you accelerate the 
> engine.  I am not running the engine until I get this fixed.