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Old 12-12-2019, 08:22 AM   #1
rockfla
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Default Same question, different approach-pictorial

Okay
back to the 39 Mercury choke knob replacement. Offered "today" by Carpenters for a replacement is a choke knob with a "blade" style actuating rod. I have a "replacement" knob but has NO rod attached, just a slot cut to go over the "existing" rod which is "hex". ANY suggestions or successful attachment with the latter description. Again hopefully the attached pictures "explains it all"???
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File Type: jpg 1939MercChoke3.jpg (20.5 KB, 115 views)
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Old 12-12-2019, 08:23 AM   #2
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Default Re: Same question, different approach-pictorial

Here is the knob on the original choke rod but how can I attach it "firmly"?
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Old 12-12-2019, 09:12 AM   #3
51 MERC-CT
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Default Re: Same question, different approach-pictorial

What I would do is, first clean and de-grease the components to remove all residue.
Then attach using 'gel' type Super Glue.
From what I can see the knob could also be 'pinned' to the shaft.
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Old 12-12-2019, 09:48 AM   #4
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Default Re: Same question, different approach-pictorial

@51-MercCT
As you can see, J B Weld didn't work as there is a little residue left on the knob from a "past" attempt. I will think through the "pin" method as getting a drill into the space where the knob fits in is tedious at minimum. Thanks for the response.
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Old 12-12-2019, 10:07 AM   #5
51 MERC-CT
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Default Re: Same question, different approach-pictorial

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Originally Posted by rockfla View Post
@51-MercCT
As you can see, J B Weld didn't work as there is a little residue left on the knob from a "past" attempt. I will think through the "pin" method as getting a drill into the space where the knob fits in is tedious at minimum. Thanks for the response.
If it were mine the whole cable assembly would be out and on the bench to do any repair.
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Old 12-12-2019, 11:30 AM   #6
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Default Re: Same question, different approach-pictorial

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Originally Posted by 51 MERC-CT View Post
If it were mine the whole cable assembly would be out and on the bench to do any repair.
That looks to be the "best" approach!!! Thanks again!!!
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Old 12-12-2019, 12:42 PM   #7
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Default Re: Same question, different approach-pictorial

Make a matching piece of plastic or metal to fit around and match contour of the bottom half of the square rod contour and then secure it bottom to the bottom of the knob top with 4-40 threaded screws.
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Old 12-12-2019, 12:48 PM   #8
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Default Re: Same question, different approach-pictorial

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Make a matching piece of plastic or metal to fit around and match contour of the bottom half of the square rod contour and then secure it bottom to the bottom of the knob top with 4-40 threaded screws.
Hmmmm. Thanks for that idea.
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Old 12-12-2019, 01:16 PM   #9
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Default Re: Same question, different approach-pictorial

How about heating the cable end and melting it into the replacement a little deeper then using a hot melt glue gun to fill in the remaining
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Old 12-12-2019, 01:39 PM   #10
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Default Re: Same question, different approach-pictorial

The Carpenter replacement would be best except for color match to other knobs. To repair the original, go back to the JB Weld, but know that it will require both chemical and mechanical bonds: For the chemical bond, as said by another, it must be cleaned and used as directed on the label. For the mechanical bond, smooth flat surfaces don't provide enough bite to overcome the leverage applied when you pull the choke, so rough up the flats and give it some nooks and crannies with a Dremel.
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Old 12-12-2019, 06:51 PM   #11
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Default Re: Same question, different approach-pictorial

It looks like someone modified the system with a different type of choke cable assembly.
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Old 12-13-2019, 04:47 AM   #12
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Default Re: Same question, different approach-pictorial

I'm a fan of both JB Weld and Gorilla gel super glue. I'd be going with 51 MERC's suggestions.....out on the bench to wire wheel and then acetone clean, followed by the gel super glue! JMO.
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Old 12-13-2019, 07:50 AM   #13
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Default Re: Same question, different approach-pictorial

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Originally Posted by rotorwrench View Post
It looks like someone modified the system with a different type of choke cable assembly.
It's an all original car, Un-restored 3 time Rouge medallion winner. SO the "aftermarket" knob is the modified part OR in this case an only "halfway to where you need to be" part.
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Old 12-13-2019, 04:12 PM   #14
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Default Re: Same question, different approach-pictorial

If I remember correctly, the Fords for 38 & 39 were similar but with obvious differences. The throttle & choke rods come through the firewall behind the dash and have a slotted fork attachment so there is some adjustability. The flat blade was attached to the rod fork with a screw that could be tightened in a position for best function. The dash had a slotted grommet that fit in the hole for the knob to pass through.

Here is a link to the throttle/choke rods at the DC site. https://www.dennis-carpenter.com/en/...-throttle-rods

DC mentions it fits Mercury but it may need tweeking. I only believe it when its installed and working.

I use a but load of different type cables on the helicopters and they aren't near as reliable as the old Ford set up like that.
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