Engine Oil pressure

Driver

Member
Mixed Farmer
So got a new manuka oil pressure gauge put into my hitatchi digger today. The one with capillary tube.

Is has an Isuzu 4bd1 turbo engine in it. It read the following pressures. At start up it was about 40 psi. Then worked it for an hour to get it hot. When left idling at working temperature it was dropping down to 15 psi. Rev it up and work it was about 30 psi.

Are these sounding low? Engine starts first click and no excess blow or anything from the breather.
 

Dave W

Member
Location
chesterfield
You really need to know the proper spec rather than a tff opinion.
But here’s my tff opinion. I’d expect a traditional engine to be around 60-80 psi
Modern engines may be vastly different
 

AnyOldName

Member
Location
The Motor City
Those numbers are pretty low, especially the 15psi hot idle pressure.

How many hours has it done? With those low pressure numbers, I’d expect one of these scenarios:

1) The engine has done a lot of hours and the bearings are all pretty worn.

2) It’s got the wrong oil in it (viscosity too low)

3) There’s a problem with a specific component, such as a damaged/worn oil pump or an internal leak somewhere.
 

box

Member
Livestock Farmer
Location
NZ
Where on the engine has the gauge been plumbed in? How accurate is the gauge? What brand is the gauge?

Lots of factors that can affect the reading. I personally wouldn't be too worried, provided it's showing *some* pressure, the engine runs well, sounds well and the idiot light isn't on.
 
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