Should my 2003 BP5 Legacy pump oil to turbo when only cranking?

[duncanrp]

Hey, So im admist replacing another turbo on my 2003 BP5 legacy. I have been told to prime the turbo by connecting oil feed and cranking the car. I wanted to test if oils was pumping before I did this and when I tried it NO oil pumped. I have discovered that it does however pump oil when the car is started and idling.

Should there be oil pressure when cranking?

[Kiwi_Fozze]

Didn't replace with another vf38 did you?

Check the oil filters at each end of the oil feed lines

[Andy_Mac]

So you get oil come out of the supply line if you try crank it with the turbo supply removed?

You'll atleast know its making its way to the turbo or not that way

[duncanrp]

 kwi_fozze']Didn't replace with another vf38 did you?

Check the oil filters at each end of the oil feed lines

I did originally, that replacement Vf38 didn't last long... going for a VF44 now.

[quote name='Andy_Mac said:

So you get oil come out of the supply line if you try crank it with the turbo supply removed?

You'll atleast know its making its way to the turbo or not that way

No, i get no oil coming from turbo oil supply line when cranking the engine over (Crank position sensor unplugged) but I do get oil coming through when the car is fully started and idling,.

[Guest]

 duncanrp said:

I did originally, that replacement Vf38 didn't last long... going for a VF44 now.

No, i get no oil coming from turbo oil supply line when cranking the engine over (Crank position sensor unplugged) but I do get oil coming through when the car is fully started and idling,.

Had same problem once out of 15 odd times on same car...

[lachlan]

Does the oil pressure light go out ?

A bb turbo only wants abour a litre a minute when its running so at crank rpm id say none would come out it .

If it comes out when idling then id be happy enough

It takes about 20 seconds for an oil light to go out on the starter motor . Then u have a lik 1mm hole feeding into 200mm of 3 mm steel hose so itd prolly take half an hour for oik to come out it on the starter . Unless the engine had just been running

Edited October 23, 2015 by lachlan