John Deere B Carb Help!

[olrusty70]

A friend of mine has bought a different carb for his B. I just tor it down tonight and cleaned everything out and re assembled it. Because i am a Oliver man what do i need to look out for and where is a good starting possition for the carb settings when we go to put this back together and run it? Thanks. BA

 

[Kurt_JDB]

B.A,

there are a few tricks to really cleaning a DLTX carb. There are some passages associated with the idle circuit that often require cleaning up by using an aircraft drill bit of the right size. These are reached by removing all the drill plugs. There is also a brass nozzel located in the stem of the carb that should be removed and cleaned.For final adjustment, you could start with about 1 and1/2 turns out on the idle needle and 3/4turn out on the load needle.

Roberts carb sells all the parts and also has info and tools. Pat"s site has some good info also.

Kurt

 

[John T]

Rusty, I agree with Kurt (been there done that n had to start all over lol) the only way to reallyyyyyyyyy clean one of those carbs while youre in there anyway is to remove the brass drill plugs n bore/clean out the passages behind them using the No 40 and 53 and other long aircraft drill bits available from Roberts Carb Repair. Often you have to use heat to get the drill plugs out. Id also remove the main center vertical brass nozzle and clean it n the bore n all its lil side holes out if its dirty at all n makse sure ther float dont have any invisible lil pin hole leaks n set the laod n idle needles apprx as Kurt said n see what happens?????

John T

 

[sgtbull]

Removing the main jet can be a trick. Best way i've found is to thoroughly clean the area below the jet, (inside the threaded portion of the lower carb body), then tap the hole in the bottom of the jet to fit a very long bolt. I usually use a bolt out of a starter or generator that holds the two end caps together, as it is plenty long. (don't recall the tap size, but just match it to your bolt) I then take a fairly large crescent wrench, dial it down to just fit the shaft of the bolt, and while holding the carb over something soft (the ground outside my shop, not the concrete floor!), use the crescent wrench like a slam hammer, and tap the head of the bolt while holding the carb in your other hand. Don't put the carb in a vise as you run a risk of breaking something. Usually, a few taps, and the jet is out. The threaded hole will have no noticeable effect on the jet's performance. I usually clean the stem out with my bead blaster, just being carefull not to get carried away with it. I've done LOTS of carbs this way with good results.