Oil Cooler Pipes - are they under pressure ?

[DiscoTdi]

TDi300 EDC auto model. The upper oil cooler hose appears to have a slight weep and I suspect the crimp is leaking.

It seems from crawling the web that on various other makes of vehicle that these oil lines are under pressure - presumably the main oil pressure from the pump - which would imply the oil flow is straight from the pump output, through the cooler and into the main galleries.

Would this the case with the TDi300 ?

If so this would seem a bit odd, as the oil flow through the cooler is controlled by a thermostat in the oil filter housing and therefore when cold there would be no oil flow to the main galleries....:confused:

So why do the oil pipes look so chunky and of the type you would expect to handle high pressure ?

I'm confused.com

Appreciate anyone who could enlighten me as to how these can be under great pressure.

Cheers

[ComicalEngineer]

The entire oil supply system is under pressure. The pressure is regulated by a bypass valve to approximately 50psi (2.3 bar) when the engine is running at normal speeds. There is also a bypass valve in the oil filter to ensure that if the oil filter blocks your engine still gets oil.

The system is sized such that oil is fed under pressure to all bearing surfaces. The pressure falls to zero as the oil weeps out and drains back into the sump.

Assume that ALL of the oil system is under 50psi at 120degC andall components must be designed for these conditions.

HTH

[rhodisland]

i changed both of mine two years ago and thay cost about £20 for both. easy job little bit of a mess

[eddie300]

The entire oil supply system is under pressure. The pressure is regulated by a bypass valve to approximately 50psi (2.3 bar) when the engine is running at normal speeds. There is also a bypass valve in the oil filter to ensure that if the oil filter blocks your engine still gets oil.

The system is sized such that oil is fed under pressure to all bearing surfaces. The pressure falls to zero as the oil weeps out and drains back into the sump.

Assume that ALL of the oil system is under 50psi at 120degC andall components must be designed for these conditions.

HTH

50psi = 3.45bar (1 bar = 14.5037744 psi)

[ComicalEngineer]

50psi = 3.45bar (1 bar = 14.5037744 psi)

Finger dyslexia. :p