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Re: starting the engine [message #322186 is a reply to message #321702]

Wed, 16 August 2017 07:27

77Royale

Messages: 461
Registered: June 2014
Location: Mid Michigan

Karma:

Senior Member

The choke plate has a small metal tab that protrudes through the passenger side of the carb. This tab fits loosely into a slot of the of end of the metal choke spring which is covered by a plastic cover. As the metal in the spring expands and collapses due to the hot and cold of the engine the spring will "tighten/wind up" with cold, and will loosen/unwind when it gets hot. The winding up or down of the spring is what moves the choke plate open or closed on the actual carb.

So with a cold engine, the spring is wound up and it forces the choke plate in the closed position. As heat is applied to the choke spring either through a choke stove/chimney tube with engine heat (which you have currently)or through an electrical connection (electric Choke)the choke plate will gradually open up. This takes a few minutes to do as the engine warms.

An electric choke is essentially the same as far as parts, but there is one wire which needs to go to 12V when the key is on. (Key on Hot) With an electric choke it does not matter if the engine is actually running, As long as the key is on the choke will warm up via electricity and will gradually open up. They are adjusted in the same manner as a non electric choke.

Why someone wants an electric choke? Perhaps the choke stove pipes are bad (mine were) You can cap off / block off the choke plate on the intake manifold and then run a single wire to key hot 12V and install the electric choke. It takes all of 10 minutes to install it.

They both work on the same principles.

That said. A hot engine when shut down will have the choke in the fully open position as it locks. To unlock the choke and get the butterfly plate to close one must push the gas pedal to the floor, This squirts a bit of gas in the carb, and also snaps shut the choke butterfly plate.

You loosen, not remove, the three slotted screws with small hold down plates on the choke housing and rotate the assembly toward the rear of the coach to adjust the choke to close more fully. Rotating it toward the front of the coach will open the choke more. This has to be done on a cold engine so the spring is fully wound up.. By adjusting we are talking rotating the housing a few degrees, or millimeters to get the butterfly plate fully closed, or very near fully closed. again on a cold engine.

Hope this helps.

77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy. Mid Michigan

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[Message index]

		starting the engine By: kstockwell on Sun, 06 August 2017 13:55
		Re: starting the engine By: shaunone on Sun, 06 August 2017 14:18
		Re: starting the engine By: kstockwell on Sun, 06 August 2017 14:26
		Re: starting the engine By: Carl S. on Sun, 06 August 2017 14:49
		Re: [GMCnet] starting the engine By: James Hupy on Sun, 06 August 2017 14:51
		Re: [GMCnet] starting the engine By: kstockwell on Sun, 06 August 2017 20:16
		Re: [GMCnet] starting the engine By: k2gkk on Sun, 06 August 2017 20:25
		Re: [GMCnet] starting the engine By: kstockwell on Sun, 06 August 2017 20:38
		Re: [GMCnet] starting the engine By: k2gkk on Sun, 06 August 2017 22:24
		Re: [GMCnet] starting the engine By: Richard Denney on Sun, 06 August 2017 22:57
		Re: starting the engine By: mrgmc3 on Sun, 06 August 2017 23:15
		Re: [GMCnet] starting the engine By: ljdavick on Mon, 07 August 2017 01:14
		Re: starting the engine By: Chris Tyler on Mon, 07 August 2017 04:24
		Re: [GMCnet] starting the engine By: Bruce Hart on Mon, 07 August 2017 06:13
		Re: [GMCnet] starting the engine By: kstockwell on Mon, 07 August 2017 07:15
		Re: starting the engine By: JohnL455 on Mon, 07 August 2017 08:56
		Re: starting the engine By: kstockwell on Sun, 13 August 2017 14:11
		Re: starting the engine By: kstockwell on Sun, 13 August 2017 14:35
		Re: [GMCnet] starting the engine By: Keith V on Mon, 14 August 2017 09:00
		Re: [GMCnet] starting the engine By: kstockwell on Mon, 14 August 2017 14:45
		Re: [GMCnet] starting the engine By: Keith V on Mon, 14 August 2017 15:20
		Re: [GMCnet] starting the engine By: kstockwell on Mon, 14 August 2017 18:00
		Re: [GMCnet] starting the engine By: 77Royale on Mon, 14 August 2017 15:34
		Re: [GMCnet] starting the engine By: kstockwell on Mon, 14 August 2017 18:25
		Re: [GMCnet] starting the engine By: k2gkk on Mon, 14 August 2017 16:21
		Re: [GMCnet] starting the engine By: kstockwell on Mon, 14 August 2017 18:02
		Re: [GMCnet] starting the engine By: k2gkk on Mon, 14 August 2017 20:35
		Re: [GMCnet] starting the engine By: Keith V on Tue, 15 August 2017 08:43
		Re: starting the engine By: JohnL455 on Tue, 15 August 2017 08:44
		Re: [GMCnet] starting the engine By: bdub on Tue, 15 August 2017 09:23
		Re: [GMCnet] starting the engine By: kstockwell on Wed, 16 August 2017 06:14
		Re: [GMCnet] starting the engine By: kstockwell on Wed, 16 August 2017 06:18
		Re: [GMCnet] starting the engine By: Richard Denney on Wed, 16 August 2017 07:03
		Re: [GMCnet] starting the engine By: USAussie on Wed, 16 August 2017 07:19
		Re: [GMCnet] starting the engine By: kstockwell on Wed, 16 August 2017 08:16
		Re: starting the engine By: jhbridges on Tue, 15 August 2017 11:05
		Re: starting the engine By: 77Royale on Wed, 16 August 2017 07:27
		Re: starting the engine By: kstockwell on Wed, 16 August 2017 19:17
		Re: starting the engine By: jhbridges on Thu, 17 August 2017 08:15
		Re: starting the engine By: kstockwell on Thu, 17 August 2017 10:11
		Re: [GMCnet] starting the engine By: James Hupy on Thu, 17 August 2017 10:26
		Re: [GMCnet] starting the engine By: jimk on Thu, 17 August 2017 11:02
		Re: [GMCnet] starting the engine By: kstockwell on Thu, 17 August 2017 11:29
		Re: [GMCnet] starting the engine By: kstockwell on Thu, 17 August 2017 17:35
		Re: [GMCnet] starting the engine By: James Hupy on Thu, 17 August 2017 18:00
		Re: [GMCnet] starting the engine By: kstockwell on Thu, 17 August 2017 18:19
		Re: [GMCnet] starting the engine By: James Hupy on Thu, 17 August 2017 18:25
		Re: [GMCnet] starting the engine By: kstockwell on Thu, 17 August 2017 18:35
		Re: [GMCnet] starting the engine By: kstockwell on Thu, 17 August 2017 18:34
		Re: [GMCnet] starting the engine By: kstockwell on Sun, 20 August 2017 08:05
		Re: [GMCnet] starting the engine By: James Hupy on Sun, 20 August 2017 09:00
		Re: [GMCnet] starting the engine By: kstockwell on Sun, 20 August 2017 09:29
		Re: starting the engine By: kstockwell on Sat, 19 August 2017 15:16
		Re: starting the engine By: C Boyd on Sat, 19 August 2017 19:00
		Re: starting the engine By: kstockwell on Sun, 20 August 2017 07:42

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