304 oil pressure problem?? Help please

[Deuce]

Hi all,

Installed 355", ran in cam for 20min on run in oil, 4days later I drove up & down the road for 10 min. The next day I changed oil & filter.
Today I fired it up for 10seconds, but the oil pressure light will not go out, so I shut it down.

Could I have an air lock, or did I not run it for long enough?
JP Standard vol oil pump -flowed.
half filled filter and Filled sump with 15w-40 Valvoline Mineral oil (ran last block on 15w-60 penrite)

Thoughts please,

 

[hotrod]

oil bit light 20w 50 is what u should use , but your oil pump maybe the culprit , or maybe ya sender on ya oil switch.

 

[Deuce]

Thought a lighter oil would be good for a 4000km new engine.
sender is new

 

[ari666]

the pressure spring inside the pump clean/lubed/working properley?

edit * havnt cut the wire by accident?

 

[Deuce]

the pressure spring inside the pump clean/lubed/working properley?

edit * havnt cut the wire by accident?

It was lubed/cleaned properly when first assembled (which there has only been ~30min running since)

Oil pressure was present before oil change, slightly lacking now (as dummy light is on) Haven't been anywhere near risking wire snipping

 

[Immortality]

I to would think that a 15w-40 is a bit light for a Holden depending on the bearing clearances.

I recommend an actual pressure gauge to see what is going on.

The run is to bed in the lifters and shouldn't really effect the oil pressure. Did you check the bearing clearances on that 355 short you got?

Did you fire it up after the oil change or has it sat for a day? If it's sat it may be an airlock in the pump. Prime it through the oil pressure sender hole.

 

[Deuce]

I to would think that a 15w-40 is a bit light for a Holden depending on the bearing clearances.

I recommend an actual pressure gauge to see what is going on.

The run is to bed in the lifters and shouldn't really effect the oil pressure. Did you check the bearing clearances on that 355 short you got?

Did you fire it up after the oil change or has it sat for a day? If it's sat it may be an airlock in the pump. Prime it through the oil pressure sender hole.

Nah, never checked the clearance's.

had to shoot out straight after change, so unfortunately I let it sit for 2days before firing it up.
I was just thinking and planning on priming it through sender hole, PITA to do though.

 

[burnz]

loosen oil filter, crank over the engine but do not start. (priming oil pump)
if unsuccessful buy new oil pump and redo priming oil pump.

PS it take around 15 minutes to change an oil pump on a 304/308..

 

[Deuce]

ok, now I have it set up for priming through sender hole, but I have no spare oil to use (unless I drain a little from the sump)
I will buy a 1ltr tomorrow and see what I can achieve with priming it through the sender hole.

 

[profat]

My apology's for butting in but why on earth would you use running in oil they stopped doing that 20 yrs. ago.... just go to coles or wollies and get their cheap and nasty oil its friction modified free which is what you need.......also best advice from experience DONT use Valvoline oil it rots the seals and destroys motors and as Immortality suggests use a proper gauge not the idiot light