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#1
08-13-2006, 01:43 PM
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oil pressure on newly rebuilt 617 engine
Rebuild included a brand new oil pump. I am in the process of just turning the engine over with the starter to build oil pressure. The injectors are out so the engine is turning over freely. How long should it be before I see any oil pressure indicted on the gauge? I get nervous turning it over without seeing any oil pressure indicated on the gauge. Should I just go ahead and button it up and start it to build pressure or continuing to turn it over without starting it?
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Jim 
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#2
08-13-2006, 01:48 PM
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That pump needs to spin pretty fast for the oil to pressurize. I am sure you lubed everything up when it was assembled to I would hit the go button and it should register on the gauge in a few seconds. If there is no oil pressure for a few seconds, like after an oil and filter change, then that is ok.
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1981 300D 147k 1998 VW Jetta Tdi 320k 2001 Dodge Ram 2500 141k 1979 300D 234k (sold) 1984 300D "Astor" 262k(sold) Mercedes How-To and Repair Pictorials I love the smell of diesel smoke in my hair 
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#4
08-13-2006, 02:12 PM
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Everything got a good dose of assembly lube. I poured about 3/4 gallon of new oil into the oil filter housing prior to installing the oil filter/lid. The MB manual does not say anything about priming the oil pump. I would think that pouring the oil into the filter housing should get some oil in the oil pump.
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Jim
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#5
08-13-2006, 02:37 PM
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Since it takes several seconds for the pump to develop pressure after an oil change, my take is that you'll be threre forever at crank speed to see any indication on the gauge.
Just need to watch it like a hawk the first time you start it. Anything more than 10 seconds and something is wrong.
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#6
08-13-2006, 03:08 PM
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Filling the galleys that are empty and full of holes takes time.
I agree with Brian, run it and see if oil psi builds after a few seconds.
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#7
08-13-2006, 03:14 PM
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Im not sure about the 617 engine but when I had the engine out of my 500SEL to clean it up, head gaskets, valve guide seals, etc, I got oil pressure up using the starter before I even put the engine back in the car. If the oil pump won't work at say 200 RPM then there is something wrong. Just make sure there is oil in it and run the starter for 15 sec, then let it cool for 15 sec. Keep the battery charged. Pressure will come up. I would remove the valve cover and look for oil to the cam. If it gets oil to the cam, the pressure doesn't matter until after it is started.
Good luck.
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84 500 SEL (307,xxx miles)
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#8
08-13-2006, 06:08 PM
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[QUOTE=engatwork;1244966] How long should it be before I see any oil pressure indicted on the gauge?
You should be fine to crank it over till oil pressure comes up as you used plenty of "assembly lube" unless you did what I did once...leave the main oil gallery plugs out 
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 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#9
08-13-2006, 08:47 PM
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That starter will build oil pressure on these cars. At least on a 617 and 603 it will.
But it will take a bit longer, start it and shut it down if no pressure builds after a few seconds.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#10
08-13-2006, 11:21 PM
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i believe my favorite machinist packs the oil pump with assembly lube to prime it.
i would never have thought to try to get pressure up by cranking on a new motor. if it is all new i wouldnt worry about it. i would think cranking it over and over would run the assembly lube out of it and cause more harm than good. when he builds a motor for me we just put it in fill it up and start it up. the white assembly grease is really great stuff. in fact i can state that a 52 caddy motor will run several minutes without any oil in the pan after assembly with it and suffer no harm. dont ask how i know. but it did include alcohol.... and i am not referring to automotive anti freeze. tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#11
08-14-2006, 01:38 AM
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On rebuilt American V-8's, I think I remember
using an electric drill with a homemade attachment to fit the distributor shaft (which turns the oil pump) to prime everything as the starter just didn't have enough RPM's. Memory is vague, but we couldn't get pressure at starter speed with those.Seeing how careful you are with the things you post about, I'd give it a go.
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The Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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#12
08-14-2006, 10:43 AM
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It is possable to install that little shaft/gear UPSIDEDOWN that turns the oil pump, resulting in no oil pressure at least on the 616, yep, I did that one too
 .
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#14
08-15-2006, 10:27 PM
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Whats it at hot idle now? 3bar?
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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