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Re: No fire on '51 GMC after sitting for a year [Re: David Bush] #1243888
Sun Nov 19 2017 12:03 PM
Sun Nov 19 2017 12:03 PM
SWEET  Offline
ODSS Lawman
Joined: Aug 2004
Posts: 1,343
Fredericksburg, VA
I'm not sure this matters, but your original post said you wired the coil negative to the distributor. If positive ground, shouldn't the positive go to the distributor???


SWEET
Sergeant At Arms
Old Dominion Stovebolt Society

BUNS?!?!?! Where we're going, we don't need no buns.....

1950 GMC 450 (25% owner)
1951 Chevy 1/2-Ton
The GreenMachine
In the Stovebolt Gallery
Re: No fire on '51 GMC after sitting for a year [Re: SWEET] #1243893
Sun Nov 19 2017 12:56 PM
Sun Nov 19 2017 12:56 PM
D
David Bush  Offline OP
Shop Shark
Joined: Oct 2008
Posts: 273
Decatur, Georgia
Hey, Sweet. I noted the way the old coil was hooked up before I installed new one. Old one wired pos to starter and neg to side of distributor. Truck ran fine this way, but I see your point. Seems like it would be the other way around. Kind or wondering why it was wired this way originally... ohwell

Re: No fire on '51 GMC after sitting for a year [Re: David Bush] #1243895
Sun Nov 19 2017 01:09 PM
Sun Nov 19 2017 01:09 PM
D
David Bush  Offline OP
Shop Shark
Joined: Oct 2008
Posts: 273
Decatur, Georgia
Been reading up a bit since I just posted. I think the PO had the coil wired backwards and I assumed it was correct since the truck ran. Don't think that's my problem, but I'm going to switch it to pos to the distributor when I get a chance to work on it today. Thanks for the input. Learn something new every day.

Re: No fire on '51 GMC after sitting for a year [Re: David Bush] #1243912
Sun Nov 19 2017 03:20 PM
Sun Nov 19 2017 03:20 PM
H
Hotrod Lincoln  Online
Boltergeist
Joined: Feb 2004
Posts: 18,564
Dellrose, TN
Reversed coil polarity requires about 20% more voltage to fire the spark plugs, since the spark is coming from the "cold" side, the ground electrode, and jumping to the center. Finding that out on a cold, wet morning when the thing won't start is quite a learning experience! I used to use that example for my students when teaching oscilloscope diagnosis- - - - -the difference in the firing line voltage on the scope is very obvious when the polarity is reversed intentionally.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: No fire on '51 GMC after sitting for a year [Re: David Bush] #1243938
Sun Nov 19 2017 06:19 PM
Sun Nov 19 2017 06:19 PM
B
bartamos  Offline
Master Gabster
Joined: May 2005
Posts: 5,907
State48 Ranch
I will still run either way. It will not cause a no spark.


1960 GMC K1001 (The Oreo SpeedWagon)
To each his own or the Highway.
All I know is what the voices in my head tell me and a little from watching TV.




Re: No fire on '51 GMC after sitting for a year [Re: bartamos] #1244028
Mon Nov 20 2017 12:54 PM
Mon Nov 20 2017 12:54 PM
D
David Bush  Offline OP
Shop Shark
Joined: Oct 2008
Posts: 273
Decatur, Georgia
Finally got through moving furniture and hanging ceiling fans and got back to the GMC last night.


...and the winner is... condenser/points. Flipped the posts on the coil so positive to distributor, new condenser and points (old ones looked bad when I pulled them. Pulled and checked plugs and tweaked the gaps so everything was right. Popped right off. Got her running by doing shade-tree timing (turn distributor until she starts, set for best idle, then slightly retard). I'll take her out today and see how she goes down the road, Mighty glad to get her going - I've got to move her to another house and it'll be much easier under power. yahoo

Thanks for all the suggestions! shake

Re: No fire on '51 GMC after sitting for a year [Re: David Bush] #1244131
Tue Nov 21 2017 12:18 PM
Tue Nov 21 2017 12:18 PM
D
David Bush  Offline OP
Shop Shark
Joined: Oct 2008
Posts: 273
Decatur, Georgia
Still got timing to mess with, running but wants to conk out at low RPM under a load. At least I can get her moved now. All I've got to do is find a place to put her! ohwell

May be selling her - hate to - bought new by my ex's great grandfather in '51. Needs valve job and clutch is pretty weak. If I do decide to let her go I'll post it first here. Basically a rust bucket with good running gear - only had about 30,000 on i t when parked - farm truck.

Thanks again for the tips to get her going.

Last edited by David Bush; Tue Nov 21 2017 12:18 PM.
Re: No fire on '51 GMC after sitting for a year [Re: David Bush] #1244139
Tue Nov 21 2017 02:19 PM
Tue Nov 21 2017 02:19 PM
Justhorsenround  Offline
Grease Monkey
Joined: Apr 2005
Posts: 7,270
El Reno, Okla
David, sorry to hear you are thinking of selling. If you do decide to go that route, be sure to post your for sale notice in the Swap Meet Forum along with a price (per Stovebolt rules) and do not post in the regular forums. Just a friendly reminder. Hope you get to keep her!


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

Re: No fire on '51 GMC after sitting for a year [Re: David Bush] #1244147
Tue Nov 21 2017 03:38 PM
Tue Nov 21 2017 03:38 PM
M
moparguy  Online
Shop Shark
Joined: Sep 2013
Posts: 783
Watford City ND...
Setting timing. The true shade tree method is to keep increasing timing until labor knock (pre-ignition knock) sets in under light load in high gear while accelerating. Then back timing off the smallest amount possible to eliminate the ping. The advantage to this system is you'll have optimum timing for the gasoline used. No timing light required.


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: No fire on '51 GMC after sitting for a year [Re: David Bush] #1244242
Wed Nov 22 2017 12:30 PM
Wed Nov 22 2017 12:30 PM
D
David Bush  Offline OP
Shop Shark
Joined: Oct 2008
Posts: 273
Decatur, Georgia
Thanks, mopar guy. That's what I'll do once I get a little time. My big thing was just to get her running and driving so she could be moved under her own power. Busy moving ex-wife right now.

Got you, Just horsing around - wasn't trying to put up an ad. If I do I'll put it in the correct forum. Hoping we won't have to sell.

Last edited by David Bush; Wed Nov 22 2017 12:32 PM.
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