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Posted by: 930cabman Feb 9 2022, 06:28 PM

We are about to fire a new 2056 and have tried to pump oil through the system prior to igniting. I have pulled the spark plugs and hooked up an oil pressure gauge. I can crank the starter for 30 seconds or so, but nothing registering on the gauge? More cranking?
Thanks

Posted by: Superhawk996 Feb 9 2022, 06:38 PM

Ideally you primed the oil pump with some light petroleum grease like Vasoline to help that pull suction quickly. If not don't panic. Postitive displacment gear pumps are self priming. Vasoline just helps expedite oil pump prime.

Again, ideally a good Moly lube on the rods and cams. Moly isn't going to wear off at slow cranking speeds. No moly? Don't panic, long before there was Moly, mechanics have been using oil to pre-lube without harm. Moly is just nice insurance.

More cranking is in order. There is a lot of volume to fill initially before you will develop pressure. 30 seconds at slow cranking with the starter speed isn't much by the time it works its way to the oil pump. Remember oil pump is driven off cam. Cam is driven off crank at 1/2 crank speed. Crank speed and rotation are but a small fraction of starter motor RPM's.

@http://www.914world.com/bbs2/index.php?showuser=24877

Posted by: fixer34 Feb 9 2022, 06:50 PM

As noted, hopefully there is some assembly lube on all the moving parts. Registering oil pressure just by cranking the starter isn't too likely due to the low speed and volume. You mainly want to make sure the oil galleries are full.
Probably better off to remove the gauge (depending where it sits) and hold a rag over the hole while someone else cranks it. Once you get oil flowing out the hole, you know the pump is primed. Put the gauge or sender back in, then fire it up. Just watch the gauge and make sure it registers in the first 5-10 seconds.

Posted by: 930cabman Feb 9 2022, 07:08 PM

Yes with the assembly lube, all main and rod bearing surfaces, same with cam bearings and plenty on the lifters and cam. I spoke with my local starter/alternator rebuilder earlier and he informed me 30 seconds or 1 minute of starter running time is fine. I have tried a couple times and the last tine I did open the fitting feeding my oil pressure gauge.
Lucky for me, I have the engine/trans on a rolling stand and it is not installed in the chassis.

Thanks for the feedback

Posted by: iankarr Feb 9 2022, 08:02 PM

What @http://www.914world.com/bbs2/index.php?showuser=22428 and @http://www.914world.com/bbs2/index.php?showuser=17908 said. On my 2056 it took probably 3 x 30 second tries. Assume you're using break in oil, right?

Posted by: bkrantz Feb 9 2022, 08:52 PM

Mine took closer to ten 30 second crank spurts.

Posted by: barefoot Feb 10 2022, 07:48 AM

My 2056 build would not produce oil pressure like you're attempting.
I pulled to cover off the pump to discover the pump was DRY !! (I was set-up to do a cam break-in on a garage floor rig so access was easy)
I finally discovered that the oil strainer in the sump had collapsed to cover the inlet suction tube.
Fixing that cured the problem quickly. I had plenty of break-in lube on all bearings & cam lobes, so everything worked out OK.

Posted by: 930cabman Feb 10 2022, 10:11 AM

Straight 30 Wt, non detergent

I did not pre fill the oil filter, but will pull it today and fill it.

Posted by: 930cabman Feb 10 2022, 10:12 AM

How did the strainer collapse? and how long ago was your build

Posted by: bkrantz Feb 10 2022, 09:39 PM

Some of the gurus here say not to pre-fill the filter. It is down-stream from the pump and might make it harder to get the pump sucking from the case.

For my break in oil, I also used straight 30, and also added a zinc boost.