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Old 02-05-2016, 02:00 PM   #1
40cpe
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Default First start after rebuild

I'm getting nervously close to starting my engine and want to do it with the least wear on internal parts. It was assembled with assembly lube on bearings, etc. I have the "95%" oiling system and will fill the filter with oil. My plan is to turn the engine with plugs out until I get oil pressure. I filled the oil pump gears with assembly lube. Will I gain anything by pouring oil down the galley going to the pump from the top? Seems as if most of it will run out the pick up tube. Anything I've missed?
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Old 02-05-2016, 02:09 PM   #2
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Default Re: First start after rebuild

Sounds like you're ready. If the pump is packed tight you should get pressure fairly quickly. Pouring oil down the hole won't do much. Be sure to use quality break in oil and
start er' up.
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Old 02-05-2016, 05:01 PM   #3
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Default Re: First start after rebuild

Your oil pump is positive displacement. If it is packed full of start up lube that should act as a check valve. I would fill the oil passage, it should drain thru the cam bearings to rod bearings. I used a 1 inch pipe with a 1x1/4 reducer on each end, screwed one end to oil port, filled with oil and used air pressure to fill the passages. No dry bearings and instant oil pressure on start up. Harley
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Old 02-05-2016, 05:23 PM   #4
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Default Re: First start after rebuild

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Originally Posted by 40cpe View Post
I'm getting nervously close to starting my engine and want to do it with the least wear on internal parts. It was assembled with assembly lube on bearings, etc. I have the "95%" oiling system and will fill the filter with oil. My plan is to turn the engine with plugs out until I get oil pressure. I filled the oil pump gears with assembly lube. Will I gain anything by pouring oil down the galley going to the pump from the top? Seems as if most of it will run out the pick up tube. Anything I've missed?

I'll be starting a rebuilt flathead up in a few weeks too and interested in this. I'm used to running the oil pump to pump up the pressure with a drill and priming shaft. Not sure what would be an initial break-in oil for these engines. Seems like I read somewhere in a previous post to use 20-50 racing oil.
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Old 02-05-2016, 06:15 PM   #5
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Default Re: First start after rebuild

No way to drive the pump with a drill. I would use a good 10W 30 for first start.
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Old 02-05-2016, 06:23 PM   #6
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Default Re: First start after rebuild

Talking oil is like playing with matches sitting in a puddle of gasoline around her...wait and watch me burn
Use a break in oil for flat tappet cams.
What youre looking for is added protection for your cam and less friction modfiers to let your rings seat.
A straight 30 break in oil will do it.
Make sure your ignition and carb jetting is set so it will run descent.
Fire it up resist the will to let it idle...rev it up and let it run for 20min.
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Old 02-05-2016, 06:52 PM   #7
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Default Re: First start after rebuild

This won't work if you've installed the engine but if it's still on the engine stand, turn the engine 180 and let the oil flow. Good luck and relax, what's the worst that can happen?
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Old 02-05-2016, 10:19 PM   #8
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Default Re: First start after rebuild

As Init1 said, I did get oil pressure pretty quickly, 50# using the starter. I'm using Comp Cams' 10w-30 break-in oil. Started it, timed it, ran it 20 minutes at ~1500-1700 RPM.
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Old 02-06-2016, 12:39 PM   #9
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Default Re: First start after rebuild

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Originally Posted by harley View Post
Your oil pump is positive displacement. If it is packed full of start up lube that should act as a check valve. I would fill the oil passage, it should drain thru the cam bearings to rod bearings. I used a 1 inch pipe with a 1x1/4 reducer on each end, screwed one end to oil port, filled with oil and used air pressure to fill the passages. No dry bearings and instant oil pressure on start up. Harley
I am thinking of doing this on my rebuild. Can you explain in a bit more detail how to do this? Thanks.
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Old 02-06-2016, 02:29 PM   #10
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Default Re: First start after rebuild

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Originally Posted by 40cpe View Post
As Init1 said, I did get oil pressure pretty quickly, 50# using the starter. I'm using Comp Cams' 10w-30 break-in oil. Started it, timed it, ran it 20 minutes at ~1500-1700 RPM.
Just to add a little, vary the speed around every few minutes. Such as 1500 RPM for a few minutes, then say 1700 RPM for a few, then maybe 1600 for a few, then back to 1500 and so on. What you do not to do is let it idle!
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Old 02-06-2016, 03:41 PM   #11
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Default Re: First start after rebuild

Also, now that you have it running and you've broken in the cam - don't run it any more without putting it under load . . . or you may find that you have a hell of a time getting the rings to seal. Lots of guys like to sit in the driveway and idle the shit out of new engines - cause the cam sounds cool - not a good idea. Run it under fairly heavy load through the gears a few times . . . don't baby it.
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Old 02-06-2016, 04:28 PM   #12
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Default Re: First start after rebuild

We're breaking in the cam with this 20 minute run, aren't we? How about running it after the 20 minute run, cool down, and re-torque head bolts? I'd like to set up my converted chevy distributor before it goes into the car. I realize the need to get on the road under load to seat the rings as soon as possible but some engine stand time is necessary first.

EDIT: Sorry Bored&Stroked, I didn't see your post before this one
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Old 02-06-2016, 10:50 PM   #13
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Default Re: First start after rebuild

IMHO any idle time on a fresh engine is not good. Need to get the timing the best you can and not be messing around on an engine stand trying to adjust the distributer. If you need to set it I would run the engine up to say 2000 RPM (or wherever the advance max is) and set the timing at the total advance you are looking for (say 18 degrees or so). To do all of this you would need some timing marks on the pulley.
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Old 02-06-2016, 10:54 PM   #14
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Default Re: First start after rebuild

Exactly what JSeery says!
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Old 02-06-2016, 11:38 PM   #15
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Default Re: First start after rebuild

I'll hold off on any more running until I can load it up.

I'm covered on the timing marks
Attached Images
File Type: jpg timingmarks.JPG (108.1 KB, 35 views)
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Old 02-07-2016, 12:05 AM   #16
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Default Re: First start after rebuild

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Originally Posted by Bored&Stroked View Post
Also, now that you have it running and you've broken in the cam - don't run it any more without putting it under load . . . or you may find that you have a hell of a time getting the rings to seal. Lots of guys like to sit in the driveway and idle the shit out of new engines - cause the cam sounds cool - not a good idea. Run it under fairly heavy load through the gears a few times . . . don't baby it.
And exactly this!! The rings need healthy gas pressure behind them to force them out to the cylinder walls and seat properly.

Lonnie
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Old 02-07-2016, 09:51 AM   #17
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Default Re: First start after rebuild

Just curious, but does anyone know how the factory did it? I'm sure the guys that drove them off the end of the line were not easy on them. I've always heard of the head bolt re torque but was it done at the dealer?
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