Got a remanufactured lm7. Need to prelube it. Don't want to buy a $250 preluber. Someone told me to pour oil over the rockers and then crank it until I have good pressure. Does that sound ok? Any other ways of doing it?
Thanks.

 

Thats what I did. It took three good cranks before it showed oil pressure. I fired it up and has been perfect ever since.

 

Sounds good to me, it will be fine.

 

Have built several ls series engines, just cranked them up on assembly lube and always had instant oil pressure.

 

Of course, disconnect the coils and fuel injectors (or pull fuses). Crank until you get pressure. Don't overheat the starter.

 

 

Finally tried to prelube and check for pressure. Nothing on the dash gauge.
Poured oil over the rockers, filled the filter. Cranked a good 20-25 seconds
more than once, no pressure on the gauge. Should I be worried? I've never worked on engines, or even installed one until now. I've got good grounds.
Need some help.
Thanks.

 

Put a mechanical gauge on the block and crank it. You need to find out if your gauge is actually functioning.

 

Funny that you mentioned it. Bought a mech. gauge from Harbor freight. It has a 3/8"-18 NPT adaptor fitting which is too big for the hole at the block. I believe the hole on the block is 3/8" NPT, but which one? If I can get the right adaptor then I can check for pressure. Anybody know what size I need?

 

The oil pressure port is 16mm x 1.5 thread. You can find adaptor fittings that go to 1/8npt