View Full Version : Engine rebuilt, how to prime the oil pump on OM647?

Glow Plug
01-11-2013, 10:17 PM
What is the correct way to prime the oil pump. It is a chain driven pump, so I don't know if there is a way to do it correctly, or if it is even necessary. I am just trying to avoid a dry start. Used assembly lube on all internals. Thanks. :thinking:

01-12-2013, 03:30 AM
Its not really necessary to prime the oil pump...

Glow Plug
01-12-2013, 05:52 AM
Is it a self priming pump?

Aqua Puttana
01-12-2013, 12:00 PM
Is it a self priming pump?
Oil pumps (gear pumps) are positive displacement design and will self prime.

On gas engines I know people who leave the spark plugs out and turn over the engine to initially pump the oil. Having the spark plugs out reduces any load on the bearings created by compression. If you leave the glow plugs out and disconnect the camshaft sensor it would do the same thing for a diesel.

Pre-running a newly rebuilt engine takes set up time so most engines are fired up without doing that. That is what assembly lube is for. That said, pre-running an unloaded engine may have some advantage. FWIW. vic