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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Wed, Oct-11-2017, 04:41:21 AM   #1
Brent S
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Default S52 First Start - Priming the oil system

Hi Everyone - Has anyone primed the oil system on a fresh rebuild by disconnecting the oil chain, submerging the pickup in oil, and spinning the pump with a drill (as an example)? I think it should help fill the oil journals and get oil flowing faster on initial startup. My concern is the length of time between engine assembly and start-up could be 12 months. The assembly lube will more than likely wick away from the applied areas due to gravity etc. over that period of time. This approach requires the oil pan be left off until the last minute. Interested to hear your thoughts.
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Old Wed, Oct-11-2017, 04:43:58 AM   #2
Braymond141
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Default Re: S52 First Start - Priming the oil system

Don’t over think it. Pull the fuel pump fuse and crank the motor to circulate the oil. Doesn’t take much.
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Old Wed, Oct-11-2017, 06:58:02 AM   #3
T3AMFiSh
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Default Re: S52 First Start - Priming the oil system

if it was a fresh rebuild... i assume you used assembly lube on all parts such as the rods, crank, cams ect correct?

these are designed to give it that protection on 1st start up until that oil flows a few seconds after the start.. you should be fine, but if you want, do as braymond says
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Old Wed, Oct-11-2017, 06:37:20 PM   #4
j0rdan J
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Default Re: S52 First Start - Priming the oil system

I have a freshly rebuilt S52 as well. I have not broken it in due to a backwards installed clutch disk. But when I first ran the motor I just cranked it once to let the fuel pressure build up. Then it fired up the second try.

If you used assembly lubricant then you are fine. If you didn't, the just pop off the valve cover and pour some oil over the valve train before you start it.
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Old Thu, Oct-12-2017, 05:25:37 AM   #5
Brent S
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Default Re: S52 First Start - Priming the oil system

Assembly lube was liberally used everywhere. My concern is the period of time between assembly and start-up. I'm sure it won't hurt but am curious if anyone else has done it?
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Old Thu, Oct-12-2017, 01:30:38 PM   #6
jayjaya29
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Default Re: S52 First Start - Priming the oil system

Assembly lube stays put. It doesn't migrate over time.
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Old Thu, Oct-12-2017, 04:47:38 PM   #7
T3AMFiSh
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Default Re: S52 First Start - Priming the oil system

just to confirm that from jayjaya29... i did a FULL rebuild on my S54 this past January.. using assembly lube on rods, bearings, cams.. it all still looks to be in place, my engine is in the car, but not started.. i had to pop the valve cover for something and its all still coated..

also, do not break in an engine on synthetic.. use conventional oil only or use actual "break in oil" from companies like Royal Purple or Redline. they have more Zinc in them to seat the piston rings to the cylinder walls. it was suggested to me by BMW engine builders to break in the engine for 100 miles, continuous if possible, alternating RPMs from 2000rpm to 4000 and vice versa using down shifting and up shifting.

Last edited by T3AMFiSh; Thu, Oct-12-2017 at 04:54:14 PM.
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Old Thu, Oct-12-2017, 07:19:21 PM   #8
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Default Re: S52 First Start - Priming the oil system

My engine builder included 8 quarts of this when I picked up my engine.
http://www.drivenracingoil.com/dro/b...n-10w-235html/

Expensive but specifically made for engine break in.
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Old Tue, Oct-17-2017, 04:37:51 PM   #9
ClutchKickChris
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Default Re: S52 First Start - Priming the oil system

If you really want to what you can do is:

Pull the fuel pump relay/fuse
Remove the spark plugs (this greatly reduces load on moving parts and increases cranking RPM)
Crank the engine from 10-15 seconds to circulate oil
Reinstall spark plugs and fuel pump relay/fuse
Let'r rip
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Old Wed, Oct-18-2017, 03:18:17 AM   #10
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Default Re: S52 First Start - Priming the oil system

Quote:
Originally Posted by Brent S View Post
Hi Everyone - Has anyone primed the oil system on a fresh rebuild by disconnecting the oil chain, submerging the pickup in oil, and spinning the pump with a drill (as an example)? I think it should help fill the oil journals and get oil flowing faster on initial startup. My concern is the length of time between engine assembly and start-up could be 12 months. The assembly lube will more than likely wick away from the applied areas due to gravity etc. over that period of time. This approach requires the oil pan be left off until the last minute. Interested to hear your thoughts.
I had rebuilt my s50 and converted to s54 sump and brand new VAC pump and when I put it all together and tried to crank it without fuel and spark I still got no oil. After exstisive dry starts and investigations i got worried i was sold a bad pump and didnt want to damage the motor by constantly cranking it looking for oil. I had to take down the oil pan and prime pump off the car then reinstall it to get oil pressure. This was a huge PITA and I wish I knew better but I learned the hard way. My advice and practice going forward is to always prime the pump b4 installing it if it is a new pump, which it should be for a rebuild. Also how I know this isn't a one time fluke is because I recomended the same pump to a friend b4 installing mine and the same exact thing happened to them after their rebuild. Was a brand new pump. It makes sense in hindsite that if a fluid pump is dry it can't create a vacume without a film of oil to seal the surfaces.

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Discussing S52 First Start - Priming the oil system in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)