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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
Joined: Aug 2004
Posts: 1,361
SWEET Offline
ODSS Lawman
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
Joined: Oct 2008
Posts: 273
D
David Bush Offline OP
Shop Shark
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
Joined: Oct 2008
Posts: 273
D
David Bush Offline OP
Shop Shark
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
Joined: Feb 2004
Posts: 19,015
H
Hotrod Lincoln Offline
Boltergeist
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
Joined: May 2005
Posts: 6,185
B
bartamos Offline
Master Gabster
I will still run either way. It will not cause a no spark.


I'm away on an ego trip. Will be back on Feb 30.


Re: No fire on '51 GMC after sitting for a year [Re: bartamos] #1244028 Mon Nov 20 2017 12:54 PM
Joined: Oct 2008
Posts: 273
D
David Bush Offline OP
Shop Shark
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
Joined: Oct 2008
Posts: 273
D
David Bush Offline OP
Shop Shark
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
Joined: Apr 2005
Posts: 7,616
Justhorsenround Offline
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
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
Joined: Sep 2013
Posts: 816
M
moparguy Online
Shop Shark
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
Joined: Oct 2008
Posts: 273
D
David Bush Offline OP
Shop Shark
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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