Oil priming... quick question

[kridgleyud]

Folks.  I'm going to be priming a rebuilt motor ... Oil pump already installed. I read that the starter can be used to crank motor with plugs out. 

Can this be done with a 6v starter and 12v battery?  Car is going to be 12v long term but I also read that the original starters are OK running 12v if you do not crank them long. 

Would this put me in the cranking too long range?

Thanks all. 

[dpollo]

With the plugs out, there is not much load on the starter so I cannot see any problems.  The  pressure should appear fairly quickly.

[maok]

Yes, no problem using a 12v battery on your starter. 

However, you are not really 'priming' the motor like that.

The purpose of priming the motor with oil is that you force oil into all the oil galleries, bearing, etc, without the engine assembly  turning.

[P15-D24]

We have seen this topic many times. Spinning the engine will eventually build pressure but you will have no lubrication for your mains or rods for quite some time. Better to use an external oil pressure tank attached to an oil gallery in the block. Fill the galleries from the external tank then spin the starter. If you used assembly lube on the rebuild it will  be gone after 1 or 2 revolutions leaving the mains without lubrication.  BTW the external tank method is what is recommended in the factory service manual.  

[wayfarer]

X2 on the pressure tank.

[kridgleyud]

thanks folks.  I'm looking at the external tank now and will rather have the insurance than ruining a fresh motor but cutting corners.

[P15-D24]

http://p15-d24.com/links/link/139-sealed-power-t40-engine-preluber-service-tool/

 

 

[Matt Wilson]

Here's my response in a separate, earlier thread.  Lots of other good info in the thread, too.

http://p15-d24.com/topic/44212-priming-oil-pump/?tab=comments#comment-471145