Any first start suggestions? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67C10BUB · 10-29-2010, 05:46 AM

I am about ready to start my 5.3L for the first time and I was wondering if anyone had any suggestions, since the motor has been sitting for a while. I already filled the coolant through the upper hose and I poured a teaspoon of Marvel Mystery oil in each cylinder and turned the crank by hand (very smooth feeling). Do I need to bleed the air from the fuel rail, or will it works its way out? Any tips would be appreciated.

*mrhino* · 10-29-2010, 12:00 PM

Pressure the rail by turning the key on and off a couple of times, and make sure you have everything out of the way. and hit the key. good luck, let us know how it goes

**TR65** · 10-29-2010, 11:29 PM

67,

My 6.0 sat for 2+ years and would not start until I bled the air out of the fuel rail with the schrader valve on the rail.

It could be that the injectors were stuck and it was just a coincidence that it started when I bled the rail? I can't find anything about bleeding air out of the rail in the service manual.

There are a lot of threads about stuck injectors after the engine sits for some years.

Good luck,

TR

68GMCCustom · 10-29-2010, 11:35 PM

since you can't use a drill to spin the oil pump like with a sbc...they say to pull power to the coils and then turn the engine over with the starter until the oil pressure comes up and/or you see oil flowing on the rockers. Then reconnect power and start it up.

67C10BUB · 10-30-2010, 09:51 AM

Thanks for the info. I started it up last night and it ran great. Very loud with open headers, though. It did seem to have a few stuck injectors. For the first few seconds it sounded like it was missing a few cylinders and then it came alive. I was so excited to finally hear it run. Maybe I'll post a video on my build thread some time soon.

Ackattack · 11-04-2010, 03:23 AM

Congrats, I know the feeling!

cdowns · 11-04-2010, 06:48 AM

on initial startups i always make sure that a freash fully charged fire extinguisher is close at hand

10-29-2010, 05:46 AM	#1
67C10BUB Registered User Join Date: Aug 2010 Location: Alta Loma, CA Posts: 610	Any first start suggestions? I am about ready to start my 5.3L for the first time and I was wondering if anyone had any suggestions, since the motor has been sitting for a while. I already filled the coolant through the upper hose and I poured a teaspoon of Marvel Mystery oil in each cylinder and turned the crank by hand (very smooth feeling). Do I need to bleed the air from the fuel rail, or will it works its way out? Any tips would be appreciated. __________________ 67 5.3L Build

10-29-2010, 12:00 PM	#2
mrhino Account Suspended Join Date: Aug 2007 Location: USA Posts: 1,223	Re: Any first start suggestions? Pressure the rail by turning the key on and off a couple of times, and make sure you have everything out of the way. and hit the key. good luck, let us know how it goes Last edited by mrhino; 10-29-2010 at 12:00 PM.

10-29-2010, 11:29 PM	#3
TR65 Senior Member Join Date: Nov 2007 Location: Greenville, SC Posts: 873	Re: Any first start suggestions? 67, My 6.0 sat for 2+ years and would not start until I bled the air out of the fuel rail with the schrader valve on the rail. It could be that the injectors were stuck and it was just a coincidence that it started when I bled the rail? I can't find anything about bleeding air out of the rail in the service manual. There are a lot of threads about stuck injectors after the engine sits for some years. Good luck, TR __________________ 1965 C10 SWB Fleet Two owner LS2 Swap Thread http://67-72chevytrucks.com/vboard/s...d.php?t=413880

10-29-2010, 11:35 PM	#4
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: Any first start suggestions? since you can't use a drill to spin the oil pump like with a sbc...they say to pull power to the coils and then turn the engine over with the starter until the oil pressure comes up and/or you see oil flowing on the rockers. Then reconnect power and start it up. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

10-30-2010, 09:51 AM	#5
67C10BUB Registered User Join Date: Aug 2010 Location: Alta Loma, CA Posts: 610	Re: Any first start suggestions? Thanks for the info. I started it up last night and it ran great. Very loud with open headers, though. It did seem to have a few stuck injectors. For the first few seconds it sounded like it was missing a few cylinders and then it came alive. I was so excited to finally hear it run. Maybe I'll post a video on my build thread some time soon. __________________ 67 5.3L Build

11-04-2010, 03:23 AM	#6
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,524	Re: Any first start suggestions? Congrats, I know the feeling! __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

11-04-2010, 06:48 AM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Any first start suggestions? on initial startups i always make sure that a freash fully charged fire extinguisher is close at hand __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY



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