on a cold Cummins 5.9, takes at least 5>10 seconds to build up enough oil pressure and flow to quiet those far up the oil flow gallery lifters, fill the push rods and pump oil up to the rockers and cover/lube them.
NORMAL operation in winter cold temps.
get used to the cold start rattle. lots of reciprocating, pumping up and down iron.
can help things by going to a 5w40 or even better 0w40 low winter temp viscosity diesel rated CJ-4 oil. John Deere, Esso in Canada make a great cold winter 0w40 diesel oil. seen CATS start on it at -50d F and below.
always use the block heater for cold starts below 20d F and an oil pan heater for below 0d F.
speeds up initial oil flow.
nothing wrong with the Fram diesel filters. millions of miles on them, just not the quality of Donaldson, Cummins, etc. Everyone has their price point, we all don't shop at Neiman Markus or Walmart
DON'T push the idle up until the oil pressure gauge comes off zero and moves up. Let the bearing get some oil before you start running up the crankshaft speed.
Cummins valve train/lifters/rockers are noisy. this is not a piece of German engineering, a Mercedes you don't even hear drive up behind you.
did you replace the oil pump and pickup gaskets when you did the rebuild
. always a good idea.
the Cummins gerotor oil pump is good for 300k >500k miles if not run with diesel in the oil.
always recheck the valve lash measure 2k>5k miles after a rebuild. too loose, no real problem just noisy.
too tight and a valve smacks a piston top...disastrous in a diesel
My 2005 does the same thing since the engine rebuild. i replaced the oil sending unit with no change. If I bring the idle up to about 1,000 RPM when I first start the truck, it won't do it.
My concern is that the valves are quite noisy at first start-up, then get quiet, indicating no oil pressure at start-up for 5 to 10 seconds.
I use the Rotella 15 40 and O'reilley's filters. I just bought a box of Fram filters off of eBay but I haven't changed the oil yet.
I am going to adjust the valves, and see if there is any change at start-up.
I was worried that there may be some kind of restriction or maybe some part is worn causing this.