Originally Posted by Jzack
My Cummins manual actually states to pull the fuel relay and crank the engine for a certain amount of time after storage to prevent a dry start. I like to use Lucas Oil Stabilizer to prevent a dry start condition instead. I don't believe you will have oil pressure immediately upon start up after long term storage.
How much storage time before you need to do this? Over 6 months? 1 month? Can you post a copy of that section from your Cummins manual? What engine size are you talking about?
I was a diesel mechanic for 30 years (retired now) and I have never heard this. However, I'm sure there are plenty of things I never heard about.
These big diesel engines create oil pressure so fast, that some manufacturers (i.e. Cat) want you to install the oil filter dry. It is printed (to not to pre-fill) on the filter itself. But that's for a normal oil/filter change - perhaps that doesn't apply to engine coming out of long term storage.
I have not been able to find any info from the engine manufacture on this. I've been searching the internet for confirmation. I can only find posts in forums (opinions about filling or not filling oil filters) - and nothing about cranking the engine to build oil pressure before starting it.
Maybe the small diesel engines (Cummins 5.9 and similar size) are different than the larger engines in this regard.
Many modern diesel engines use "high pressure oil to actuate the injectors" (i.e. HEUI) so they wont start until there is oil pressure. So no need to print anything about it in a manual, as that is the only way it works.
So how do you prevent the engine from starting on one of these big diesel engines? What relay are you pulling? There is no "fuel relay" on these larger diesel engines (they don't have electric fuel pumps).
I agree that some of the oil in the galleys and head will drain back to pan over time, but I just don't buy that the engine is going "dry" (at least not after 3 or 4 months of sitting). I've taken apart engines that were sitting in the shop yard for months and they had plenty of oil in the top end and galleys.
Of course I don't know everything. I don't want to sound like I'm arguing here.
I'm here to learn and share - so if you have anything on this from Cummins or Detroit or Volvo, post a copy.