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Low oil pressure in 92 chevy pickup

 
 
Reply Mon 6 Apr, 2009 09:41 pm
My oil pressure is fine when the engine is cold but when it gets warmed up the pressure drops to 5 or 10 on the gauge. Is this the oil pump or something else? how could i tell?
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Type: Question • Score: 0 • Views: 2,637 • Replies: 7
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Rockhead
 
  1  
Reply Mon 6 Apr, 2009 09:45 pm
@coltonlipka,
probably something else, mostly...

How many miles, and what size motor?

and what weight oil do you run.

(is this a new problem?)
coltonlipka
 
  1  
Reply Sun 12 Apr, 2009 07:08 pm
@Rockhead,
this is a new problem its a 5.7 liter with 180,000, and ive been runnin 5/30? i dont have any wierd noises, and it runs fine except for the pressure dropping when at idle, i just replaced the timing chain a month ago, other then that no problems
Rockhead
 
  1  
Reply Sun 12 Apr, 2009 07:17 pm
@coltonlipka,
unless you live Way North, try running a 10/30 oil.

(I have a 90 with 175,000+ and I run 10/40 in it.)

5 weight is awfully thin after they get some use on them.
coltonlipka
 
  1  
Reply Wed 15 Apr, 2009 10:11 pm
@Rockhead,
ok i actually do live prety far north, anchorage , alaska. and i just changed to 10/30 but the pressure is still droppin after warm so should i go heavier
Rockhead
 
  1  
Reply Wed 15 Apr, 2009 10:17 pm
@coltonlipka,
you need 15 lbs of pressure at idle to be safe.

20/50 might work while it is warm, but it sounds like you may have trouble brewing...
coltonlipka
 
  1  
Reply Thu 23 Apr, 2009 08:26 pm
@Rockhead,
well bumer so should i replace the pump or is there a way to tell what is causing the pressure drop
Rockhead
 
  1  
Reply Thu 23 Apr, 2009 08:33 pm
@coltonlipka,
you can put a higher volume pump in it, but the long and short of it is that your bearing clearances have grown to the point that you are on the twilight of the motor.
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