How to spin new engine to build oil pressure before start

[daytona701]

Hi, Just finished installing rebuilt 5.7 in 2012 1500. I want to spin engine with starter to see oil pressure before running engine. Removed fuel pump fuse and engine won’t spin. What’s the best way to spin engine without starting? Thanks.

 

[GTyankee]

Remove the spark plugs, that eliminates compression
It will freewheel

On my Harley, i remove the plugs, shoot a couple shots of light weight oil into the cylinders & press the starter button
No pressure is put on the crankshaft or camshaft

 

[SYKRAMMAN]

Or just floor it and it will crank and crank till you let off the pedal, it puts the truck in flood mode.

 

[ramffml]

Or just floor it and it will crank and crank till you let off the pedal, it puts the truck in flood mode.

I could just try it myself of course; but when you let go of the pedal and the engine catches, does the engine rev any higher on that initial catch than it would have with a normal start? Does it rev higher than normal?

 

[daytona701]

The engine is rebuilt and hasn’t been started yet. I want to spin the engine without starting until I see oil pressure on the oil pressure gauge to make sure there is oil circulated throughout the engine before initial startup. The fuel line is disconnected at the intake manifold. I removed the fuel pump fuse and the starter doesn’t work. If the ecm doesn’t see voltage at the fuel pump does the ecm stop the starter from working?

 

[SYKRAMMAN]

I could just try it myself of course; but when you let go of the pedal and the engine catches, does the engine rev any higher on that initial catch than it would have with a normal start? Does it rev higher than normal?

It revs a little if you continue cranking, just let off the pedal and ignition the same time.

 

[daytona701]

I would rather not have to remove 8 coils and 16 spark plugs. I could unplug the coils to prevent firing the spark plugs.

 

[British Bulldog]

All this is sound advice……in the old days when I have rebuilt engines, crank with spark plug leads off, or disconnect coils. I assume it would still work. Yes, major pain to take all those spark plugs out again!
If it cranks with leads off, I can’t see a problem and you will get oil pumped around engine and pressure up. BUT, before anyone else says it, I’m no expert lol.

 

[daytona701]

Ok, tried to spin the engine and battery was at 11.78 volts after 2 days on the trickle charger. Just got a click at the solenoid. Got the last new H-7 AGM battery on the shelf at Walmart. Walmart didn’t have regular H-7. Guess I should feel lucky even if it cost $180 with a 4 year warranty. Installed new battery and used a old flexible vacuum hose to route the gas coming out the fuel line on top of the engine to a 1 gallon plastic water bottle on the floor under the truck. Cranked starter about 6 times without seeing rise in oil pressure. Connected fuel line and started engine. Ran rough for 30 seconds than smoothed out real good.

 

[dhay13]

Back when I used to build engines I would spin the pump up with a drill and priming rod. When I first started I did do what you are wanting to do but was quickly convinced that wasn't a good idea. Even though RPM's are low you are still spinning metal to metal with no oil pressure until your passages and oil galleys are filled. This was with Chevy engines and I never built a Mopar so can't speak from experience with them. If the builser already primed it then you might be ok since the passages would already be filled

 

[Mister Luck]

I’ve haven’t had the experience in building a 5.7 hope you took pictures of your process

We would pack the oil pump with grease and the pressure created would vacuum up the oil from the pan into the oil pump and into the galleys

Another way is there’s a device called pressurized oil priming tank
re-builders and engine shops sometimes loan them out but I don’t know if they’d work on your build.

EDIT
found this :

5.7 Rebuild, Priming the Oil Pump?

www.chargerforums.com

EDIT#2

Not sure if a garden sprayer would work because
I think you need at least 100psi

 

[HEMIMANN]

Elsewhere in the Forum we were discussing just this, but for any Hemi engine - not just new. This was a pre-lube strategy if the engine hasn't been run for a while, of if it's cold out.

A member advised us that these engines can be cranked over without starting by pressing the gas pedal to the floor, then cranking. It would for a number of us - don't know if it works across all model years, variants, etc.

Give it a try! Short of that, in the old days we'd punk homies by pulling the coil primary wire. Not sure there's one main primary feed wire anymore.

 

[kurek]

A member advised us that these engines can be cranked over without starting by pressing the gas pedal to the floor, then cranking. It would for a number of us - don't know if it works across all model years, variants, etc

I've read this has been true since the dawn of fuel injection, as a "flood clear" strategy - BUT - I still have never done it on a vehicle I want to build oil pressure on and doubt I ever will.

What happens if for whatever reason it doesn't work? Vehicle starts up at full throttle and begins to rev before any oil pressure's present? No thanks.

On the 5.0 Mustang I just put new rockers/etc in I simply unplugged the fuel pump fuse.

 

[Mister Luck]

Something Like this connector on your oil filter housing
it’s supposed to be M22 x 1.5 thread pitch with a Quick connect 3/8 or 1/4 end of a pressure hose

General Pump D10037 General Pump 3/8" Male Quick-Connect Plug With M22 Female End | Ferguson Home

Save on the General Pump D10037 from Ferguson Home. Low Prices + Fast & Free Shipping on Most Orders. Find reviews, expert advice, manuals, specs & more.

www.pressurewashersdirect.com

Amazon.com: Fitting Metric M22 M22X1.5 Female to Pipe 1/8" BSP BSPP Female Adapter : Industrial & Scientific

Amazon.com: Fitting Metric M22 M22X1.5 Female to Pipe 1/8" BSP BSPP Female Adapter : Industrial & Scientific

www.amazon.com

 

[StickyLifter]

Floor gas pedal and hold
Turn ignition fob like you want to start it then let off.
Hold pedal down until you see oil pressure.
Let up on pedal to stop the starter motor.

Start as normal.

There is no extra rev, it doesn't dump fuel in the cylinders, and it won't hurt anything, but it will build oil pressure before you start it. I do it on cold mornings all the time. It's exactly what you want to do.

The engine will not start with the throttle depressed, it will just keep spinning the starter motor until you let up on the pedal.

 

[Bigskyroadglide]

Go here

16 minutes 11 seconds

Watch "HEMI Swap with Jasper Engines Replacement 5.7 in a Dodge Ram 1500 on 37" Tires" on YouTube

HEMI Swap with Jasper Engines Replacement 5.7 in a Dodge Ram 1500 on 37" Tires

http://www.jasperengines.com/stock-replacement-enginesThis is the official start of the 2009 Dodge Ram 1500 HEMI truck project in the AutoEdits Garage! This...

youtu.be

 

[StickyLifter]

That dude did it wrong. You don't have to hold the fob in the start position, just floor it and bump it like you always do in a 4th gen and it will spin until you release the pedal. The dip stick doesn't matter as long as there isn't oil pumping out on the floor. You want to have your gauges set so that you can see it build some oil pressure BEFORE it starts. 10 or 20psi is fine and then immediately start it while it has that pressure. If you let it sit it will bleed the pressure back down.

 

[Bigskyroadglide]

I would say it works either way. The point was a video to demonstrate it would not start with the gas pedal fully depressed and how it could be accomplished. The truck and the engine does not care about technique once it builds pressure above 5 psi.

I agree getting out and checking the dipstick is not necessary.

 

[StickyLifter]

I would say it works either way. The point was a video to demonstrate it would not start with the gas pedal fully depressed and how it could be accomplished. The truck and the engine does not care about technique once it builds pressure above 5 psi.

I agree getting out and checking the dipstick is not necessary.

Agree 100% Nothing beats that new engine excitment. Just wanted to get that oil pressure check suggestion in, but came off kinda jerky. Once I discovered the gas pedal trick, I started using it when I start my car in storage and my RAM on cold days. It's a super cool feature.

 

[GTyankee]

Every time that i had a rebuilt engine
i screw the spark plugs in about 2 threads to keep everything out of the cylinders

Then drop the engine into the vehicle or a solid engine stand & bolt it down & give it 12 volt wiring

Pull the plugs out shoot some light weight oil in the cylinders & turn it over, until you see oil pressure.
Put the plugs back in, Finish connecting everything up

I never worked on a new age HEMI, but i can't think much would be different