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John Deere Tractors Discussion Forum
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Starting a B

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Ken Tabor

01-24-2004 17:06:06




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I recently obtained a model B. Had the magneto rebuilt, the carb rebuilt, the starter rebuilt. The motor is free. Tried to start it and can only get it to pop. Blew the can off the exhaust a few times, but can't get it to run. Switched the wires around on the magneto, moved the drive on the magneto 180 degrees. Tried a little ether. The valves are free and all are opening and closing. Suggestions? Ken

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Russ

01-25-2004 08:04:18




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 Re: Starting a B in reply to Ken Tabor, 01-24-2004 17:06:06  
JD B; IF YOU HAVE A FULLY CHARGED 6V BATTERY, NEW SPARKPLUGS AND FOLLOW THE LEADS OF CLOONEY AND NORDHOFF YOUR ONLY OTHER PROBLEM WILL BE SHUTTING IT OFF. AT SOME POINT TURN OPEN AND THEN SHUT OFF THE BRASS PETCOCKS BOTH LEFT AND RIGHT SIDES INTO A CLEAR CONTAINER AND LOOK FOR EXCESS WATER. GET A FULL B SERVICE MANUAL SO YOU CAN STUDY UP ON YOUR BEAST. THE INITIAL SETTINGS OF THE DLTX 67 OR OTHER CARB WILL BE KEY ALSO. GOOD LUCK.

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John T

01-24-2004 17:51:55




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 Re: Starting a B in reply to Ken Tabor, 01-24-2004 17:06:06  
Ken, if you BOTH swapped plug wires and reversed the mag 180, then youre right back where you started. If its a non gear reduction drive mag like a Wico C or X or similar, reversing the wires or rotating 180 and replacing the mag has the same affect. If its 180 out, they will often pop or bang or backfire or the flywheel will kick backwards. Remove the wires and with them attached to the plug and the plugs side up against frame ground, insure the left fires the left cylinder at TDC on its power stroke and then 180 later the right fires. You need a good visible blue and not a faint thin wimpy yellow spark. At cranking speeds, the mag has to produce a loud sharp snapping sound to fire the plugs.

I would install fresh plugs just to be safe, check that the spark is blue and fires on the pistons TDC, insure you have fresh clean water free gas, check the air cleaners lower bowl to make sure its water free, and see what happens.

Open the carb bowls lower drain cock/plug and insure a steady stream of gas flows a couple minutes approx 1/16 inch diameter. Make sure the choke butterfly plates is closing.

Post back your findings and any more questions or e mail [email protected] and we will go from there. Maybe try a pull start also.

Good Luck n God Bless

John T Nordhoff

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Clooney

01-24-2004 17:33:27




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 Re: Starting a B in reply to Ken Tabor, 01-24-2004 17:06:06  
Ken, with all that wire & mag moving you need to go back to square one & make sure the L/H side is producing a spark when the L/H piston is at TDC.. To do that just remove the L/H spark plug, then place it back in the plug wire & lay it on the block, then turn the engine in the starting direction & see if that left side is sparking as the dot on the flywheel hub lines up with the dimple in the flywheel covers bottom center.. If not you need to move the wires or mag, or turn the mag until it does..

~If it still won't start then you have another problem like leaking piston rings [try about 3oz of oil in each cylinder] or rusted valve faces or seats [you might have to pull start the tractor if the valves or seats are rusted],, or a carb choke problem [make sure the choke closes completely]..

~If you haven't already done so REPLACE THE SPARK PLUGS [no matter how good they look] as that is the major cause of those old Deere's having starting or runability problems..

~It might not hurt to do a compression test to see if you have enough initial compression to start it.. If it's way low try that 3oz of oil in each cylinder..

~Here's the bottom line... IF you have enough compression, & have a good fuel air mixture, & have a good blue spark AT THE CORRECT TIME, it WILL start..Now all you have to figure out is what it doesn't have....

~Let us know if it has ever run, or any other information or other things that have been done to it & we can help you get it going..

[email protected]

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Ken Tabor

01-24-2004 17:29:41




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 Re: Starting a B in reply to Ken Tabor, 01-24-2004 17:06:06  
I tried timing the mag, tried misting gas and ether into the manifold with a spray gun, rebuilt the carb and put that back on and did some playing with the adjustments. Still can't get anything but a frequent pop and bang.



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old

01-24-2004 17:29:32




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 Re: Starting a B in reply to Ken Tabor, 01-24-2004 17:06:06  
Have you checked the spark, is it yellow or is it blue, needs to be blue also how old are the plugs and what type of plug wire you have if they aren't copper core/true wire plug wires if won't run and if it does it won't run right



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Chris

01-24-2004 17:22:16




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 Re: Starting a B in reply to Ken Tabor, 01-24-2004 17:06:06  
Did you time your mag before you put it back on? I have made that mistake before. Also make sure you are getting a full flow of gasoline to your carb. Has the tractor been setting for a while?



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