DXLT carburetor rebuild

[Cessnapilot89]

Hello folks,

Sorry to be a bother, but how hard is it to rebuild a DXLT 71 carburetor? My only carb rebuild experience was on an SU from an MG midget. Are there any specialty tools that j need to look for?
Also , is there a recommended vendor I should shop with?

 

[greenmech]

Hello folks,

Sorry to be a bother, but how hard is it to rebuild a DXLT 71 carburetor? My only carb rebuild experience was on an SU from an MG midget. Are there any specialty tools that j need to look for?
Also , is there a recommended vendor I should shop with?

Not too hard, you may want to get a video from Robert's Carb shop that shows how. Ron MN

 

[620 John]

Special tools I use are:

1/4" tap to tap threads into the nozzle and use a 1/4" bolt to remove it.

An adjustable reamer for reaming the throttle shaft bushings. https://drillsandcutters.com/7-a-hss-adjustable-reamer-9-32-5-16/

Drill bits
https://www.amazon.com/Black-Aircraft-Extension-Qualtech-Length/dp/B07BF5QZ8B

https://www.amazon.com/Cobalt-Aircraft-Extension-Glbcox640-Length/dp/B0799GZ2C9

And I have a sand blast cabinet to bead blast the entire carb. If you don't have cabinet find someone who does and have them blast it.

Carb kits I've been getting from Marks Carb Parts on Ebay or Steiner tractor parts.

 

[Cessnapilot89]

Thank you! What media do you use in your blast cabinet?

 

[Mark-Ia]

You will need to heat the brass plugs to get them out.

 

[620 John]

Thank you! What media do you use in your blast cabinet?

If I remember right I'm using Black Beauty blast media fine 20/40 mesh

Another thing I just remembered is the float hinge bushings can be hard to get out. Heating them helps but they can still be stubborn sometimes. I found that an impact driver works really good for those. https://www.napaonline.com/en/p/SER1140?cid=paidsearch_shopping_dcoe_google

 

[Cessnapilot89]

Thank you all! I appreciate it

 

[Mike(NEOhio)]

I rebuilt a 71 and 46 with parts from Roberts. The throttle plate will wear at the bottom due to its vertical shaft. Get a new one. With the new bushings it helps to file them flush with the bore or it will be hard to get it to idle well. A little heat with a propane torch will get the brass plugs to come out easier, just use a good screwdriver. I made a puller for the nozzle from a 10-32 threaded rod and nut.

 

[620 John]

I rebuilt a 71 and 46 with parts from Roberts. The throttle plate will wear at the bottom due to its vertical shaft. Get a new one. With the new bushings it helps to file them flush with the bore or it will be hard to get it to idle well. A little heat with a propane torch will get the brass plugs to come out easier, just use a good screwdriver. I made a puller for the nozzle from a 10-32 threaded rod and nut.

I do something similar with the throttle bushings.

I push the bushings in further than they need to be and use a die grinder and flap wheel to shape the bushing to the same profile as the carb bore. Whether this makes a noticeable difference in performance I do not know.

 

[Mike(NEOhio)]

I do something similar with the throttle bushings.

I push the bushings in further than they need to be and use a die grinder and flap wheel to shape the bushing to the same profile as the carb bore. Whether this makes a noticeable difference in performance I do not know.

View attachment 79119

View attachment 79120

I used a die grinder or Dremmel too. Didn't mention it because most guys don't have one.

 

[Cessnapilot89]

Thank you gents! I appreciate it!

 

[sandhillcarbs]

Thank you gents! I appreciate it!

I'd Be happy to rebuild it for you!!!

give me a call anytime

 

[DiggerSr]

What are the threads of the 2 Brass drill plugs next the economizer that you have to go threw the flange to get at. I got 1 out, the other was pretty well stuck. Drilled it out , but need to clean up the threads some.
Thanks in advance

 

[Mike(NEOhio)]

I rebui

What are the threads of the 2 Brass drill plugs next the economizer that you have to go threw the flange to get at. I got 1 out, the other was pretty well stuck. Drilled it out , but need to clean up the threads some.
Thanks in advance

I rebuilt a 71 and a 46. No trouble getting the plugs out. Clamped to the bench, a "good" screwdriver with both hands and a little propane torch till it just smokes. Roberts Carb sells the taps.

 

[DiggerSr]

It was clamped in a vise, had a good screw driver... used MAP gas and got it good and hot. Still wouldn't budge. Ended up drilling the majority of it out. Wanted to clean up the threads. Was wondering what the treads were

 

[DiggerSr]

never mind. Figured it out already. All threads cleaned out, and tapped the fuel nozzle and pulled that out too.

 

[620 John]

As mentioned earlier, an impact driver can be your friend in that situation. Glad it worked out though.

 

[NoDakInMN]

Works better if you use a small tip on an oxy/acetylene torch. Heat then can be focused more directly on the brass plug. Entire procedure on Robert's video, never had one fail to come out easily using that method.

 

[51PuddlejumperB]

Hello folks,

Sorry to be a bother, but how hard is it to rebuild a DXLT 71 carburetor? My only carb rebuild experience was on an SU from an MG midget. Are there any specialty tools that j need to look for?
Also , is there a recommended vendor I should shop with?

Don’t forget to clean the three tiny holes near the throttle plate (side of the throat)