oil system

[IwantMKIII]

you won't see oil pressure as the stock gauge and most aftermarket gauges are not mechanical gauges.

Because of this, when you turn the engine over, nearly all electrical power is provided to the starter. This is why your radio turns off if it was on with the key turned to the the On position and you try to start the engine.

 

[deabionni]

you won't see oil pressure as the stock gauge and most aftermarket gauges are not mechanical gauges.

That makes sense, as I know I've cranked it enough by now that it should have oil throughout the whole system.

Do you think it'd be safe to try to start now?

 

[HommerSimpson]

if you pull the plugs the motor will crank a crap load faster... when the engine picks up oil you will hear the engine slow down due to it pumpin oil not air...

myself i like to crank it over till i feel the engine slow down.. and the guage go up... wait a few minuts and do over a few times......

 

[deabionni]

^^^ I don't have a spark plug socket with me today, so I'm priming it with the spark plugs in the engine.

Cranking it this way, will the gauge eventually move or will it stay at 0 PSI? I've been cranking on it which seems like forever. I spun off the oil fill cap, and there's oil on the cam lobe underneath that cap; so I know that there's oil circulating to the top of the engine, but still no pressure showing up on the gauge. (And yes, I double checked to see that the oil pressure sender is hooked up).

 

[Rennat]

what i discovered while troubleshooting my friends car was that, his car was FULLY charged, and i wanted to prime it before we started it because it had sat for a while. so i sat here and i hit 'start' with the key, and it spun and spun and spun and spun, i had to do like 3 long ass terms for it build pressure, but once it built the pressure, it was UP right away.

so it just takes a while...

 

[deabionni]

How long can I safely crank the engine?

The starter wire gets pretty hot after cranking for thirty seconds, which is why I shortened the cranking time to 15 seconds. However, apparently 15 second bursts with a minute in between isn't long enough, as I'm still not showing anything on the gauge.

BTW, thanks for all the help. I just want to make sure I don't screw anything up by starting the engine before the oiling system is ready.

 

[HommerSimpson]

How long can I safely crank the engine?

The starter wire gets pretty hot after cranking for thirty seconds, which is why I shortened the cranking time to 15 seconds. However, apparently 15 second bursts with a minute in between isn't long enough, as I'm still not showing anything on the gauge.

BTW, thanks for all the help. I just want to make sure I don't screw anything up by starting the engine before the oiling system is ready.

are the plugs in ? if so pull them...

 

[Rennat]

you dont have to pull the plugs. just undo the efi fuse, just like a rebuild. and then just crank it like a mother...

but it does take a while, and with the supras crummy wiring... it doesnt help...

 

[jdub]

you dont have to pull the plugs. just undo the efi fuse, just like a rebuild. and then just crank it like a mother...

but it does take a while, and with the supras crummy wiring... it doesnt help...

For one it won't start the engine

Two its not as hard on the starter since there is no pressure in the cylinder so it shouldn't heat up as much since it will be running so long.

 

[Rennat]

i guess that means we were right?

 

[MassSupra89]

No it means pulling the plugs will help in the ways IWant described as above.

With no plugs the starter doesn't have to fight against the compression when cranking it.

 

[CTsupra]

you won't see oil pressure as the stock gauge and most after market gauges are not mechanical gauges.

There is your answer. ^

When I change my oil, I crank for 10, 20 and 30 seconds respectively. Maybe a 15-20 second rest between cranks. Stock gauge will not show pressure, though the motor will be lubed.

 

[jdub]

i guess that means we were right?

LOL...pulling the plugs is a LOT easier on the starter and wiring.

 

[deabionni]

LOL, thanks for all the tips but I'm still confused on one thing: Will the stock gauge show pressure while cranking or not? Some of you say yes, while others say no. Which is it?

So far, I've been waiting for pressure to show on the gauge.

 

[Rennat]

according to everybody here, the stock gauge will not show pressure.

guess every car is a little different...

i just dont see the point in pulling plugs just to crank the motor... i've always, even on rebuilds, put the motor in complete, pulled the EFI fuse, and just crank it.

 

[IwantMKIII]

according to everybody here, the stock gauge will not show pressure.

guess every car is a little different...

i just dont see the point in pulling plugs just to crank the motor... i've always, even on rebuilds, put the motor in complete, pulled the EFI fuse, and just crank it.

Rennat, you're looking at it the wrong way. Its not just to eliminate spark (what pulling the fuses will do), just as I describes before, pulling the plugs will greatly reduce the force require by the starter and power require by the battery by eliminating the need for compression.

It is not required, just recomended as you could:

1 - burn out the starter
2 - drain the battery until dead as it will require much more power to compress
3 - stock wiring sucks and you run the risk of overheating the wiring, ultimately, greatly increasing resistance and causing even higher battery power requirements

And yes, the oil pressure will not show any pressure. It could work is if you devised a new wiring system for it to receive power while turning over the engine, but this is just not necessary.

 

[IJ.]

Mine shows pressure while cranking......

 

[Rennat]

i understand the concept, im just saying i never do it and for me at least, it works fine.

and IJ yours isnt the typical 7M by anymeans...

 

[IJ.]

Yeah but my Oil pressure gauge is stock and wired stock.... maybe you guys aren't making enough pressure cranking to register?

 

[HommerSimpson]

mine shows while cranking.....its stock