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4.0cck vacuum booster and choke troubles


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  #1  
Old 12-12-2009, 10:42:48 AM
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ssimntih ssimntih is offline
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Default 4.0cck vacuum booster and choke troubles

our 4.0cck will over correct with the choke when we first start it, is there any way to put a solenoid on this? does anyone have any other fixes? also the "vacuum booster" on the manifold, how is this supposed to work? ours has worn the linkage in two and is no longer hooked up. does anyone have a parts breakdown on this booster?

on our welders, while they're running we can reach in with a armature stone and true the armature, can this be done on our onan generator? any other maintenance we should know about? were using this on a daily basis on a semi.

Last edited by ssimntih; 12-12-2009 at 10:48:57 AM.
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Old 12-12-2009, 11:36:51 AM
K D Redd K D Redd is offline
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Default Re: 4.0cck vacuum booster and choke troubles

When you say the choke over corrects when you first start the engine, are you meaning the choke does not unload quickly enough causing the engine to stumble from over choking? If so, my recent 4CCK purchase does the same thing. I have check and I have a good choke heating element and I also have the 28 or so volts from the generator head that heats the heating element. The heating element , after about 45 seconds to a minute get hot enough for the spring to relax. Being more familiar with automotive automatic chokes, It looks to me as if a vacuum dash-pot is needed to help open the choke when the engine starts. So far I have been manually opening the choke after engine start. I too would like an answer. We may need a new bi metal spring for the choke.
My unit also has a vacuum booster. It seam connected correctly. I can take a picture of it and post it here.

Kent
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Old 12-12-2009, 12:02:50 PM
Ben Clarke Ben Clarke is offline
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Default Re: 4.0cck vacuum booster and choke troubles

The automatic chokes on my CCK's all are adjustable. They have indicators stamped on them for richer and leaner settings. To adjust you loosen the locking screws and turn in the desired direction. Have a look to see if yours has the same set up.
Ben
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Old 12-12-2009, 08:33:43 PM
K D Redd K D Redd is offline
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Default Re: 4.0cck vacuum booster and choke troubles

Ben,

I am very aware of the adjustment. This is NOT my First Rodeo with an automatic choke. If I adjust it where the engine will be choke when it needs to be, The engine loads up to the point of almost dieing after start-up. If I manually open the choke everything is fine after about a minute as the bi-metal spring has been heated by the 28 olt dc power from the generator head fully opening the choke. I have adjusted it a couple of times.

ssimntih,

Here are a couple of picture of the linkage on the vacuum assist on my 4 CCK.

Kent
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Old 12-13-2009, 01:59:32 PM
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Default Re: 4.0cck vacuum booster and choke troubles

i think the springs are bad in our chokes, ours does exactly the same thing, no matter how you adjust it it doesnt work. last night we put a solenoid type choke mechanism off a mercury boat motor on our onan, just push a button and it chokes it, let off the button and it opens the choke, ill try to get pics up in the next few days.
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Old 12-13-2009, 02:27:54 PM
pegasuspinto pegasuspinto is offline
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Default Re: 4.0cck vacuum booster and choke troubles

I've seen this 'problem' on AJ Onans, they lack a pulloff for the choke. They all start fine, run a bit rough, after about 1 minute the choke opens up and they run fine. I just tell folks to let them warm up first. There is nothing broken about them, just made a bit low-tech.

Robert
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