Re: stag-digest V3 #98

[ASMaughan <ASMaughan@domain.elided>]

In a message dated 02/04/98  08:32:48, you write:

<< Subject: Oil pressure
 
 Bruce
 
 The best thing about oil guages is, the Stag doesn't normally have one!
 
 I don't, because;
 1.  they are something else to worry about
 2.  they are never accurate
 3.  oil pressure is of hardly any consequence
 4.  They don't measure oil flow
 5.  oil pressure is controlled by the relief valve, more than the bearing=
 s
  >>

Bruce,

Once again very sound advice from Mike. I have found that a Stag engine with
knackered bearings will tend to show low pressure mainly at hot idle, but
usually manage a fairly respectable pressure on the run. This is because the
engine idles very slowly and so the pump revolves very slowly thereby not
moving much oil, once at revs the pump spins faster it can manage to overcome
the lack of backpressure in the system caused by worn bearings.

One unscientific indication of worn bearings is to travel hot at say at 60mph
and just ease back gently on the throttle ( not enough to decelerate ) worn
bearings will allow the crank to move slightly upward in the journals so
blocking more effectively the oil ways and gives a slight ( 5psi ) rise in
pressure.

If it is the pump plain tired, MOSS sell for 3UKP an uprated spring which on a
good engine gives hot idle of 50psi and running pressure around 80psi. Might
stretch the chains quicker but its comforting to know you've plenty of blood
pressure.


Andy Maughan