Question about John Deere 420,1020,2010,2020,2510,2520 Tractor Float

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John Deere Model 445 garden tractor. Replaced plastic cam shaft gear, tried to start motor and it backfires through carb. I just removed front cover of engine to check the timing marks on both the camshaft gear and the crank shaft, everything set properly. I did not change the valves settings. Not sure what to check next.

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  • Al Spiegelhalter
    Al Spiegelhalter Aug 04, 2010

    I would like for 'John' to look at this problem.

  • Al Spiegelhalter
    Al Spiegelhalter Aug 05, 2010

    OK, you think the distributor is out 180 degrees. I have looked for a distributor, but I am unable to locate one. I need more details on how to correct the timing.

  • Al Spiegelhalter
    Al Spiegelhalter Aug 05, 2010

    John Deere 445 replaced camshaft, now backfires through the carb. it was suggested to rotate the camshaft. What drives the distributor? I see nothing on the camshaft that would drive the distributor. If there is nothing on the camshaft gear to change the timing of the distributor rotating the camshaft gear will do nothing. I realize the crankshaft turns serveral times before the camshaft makes one turn.

  • Al Spiegelhalter
    Al Spiegelhalter Aug 06, 2010

    Please read all of the other questions and solutions to my problem. When the expert asks how many cylinders there are, apparently does not have sufficent knowledge of the JD 445 garden tractor. I would appreciate someone that has knowledge of this tractor to answer my problem.

  • Al Spiegelhalter
    Al Spiegelhalter Aug 07, 2010

    I need help with my John Deere 445 - I need help from someone who knows about this engine.

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Hi

Please check for the anti back fire solenoid in the front of the carb. Check whether the wiring to it is fine and if it is getting +12 V. If yes then you maybe required to replace the solenod.
However, if this doesn't resolve the issue then you would need to adjust manually so that decompresser works normally. Inspect the flywheel key as well, it may have sheared.

Check the carb filter and the make sure there is no sign of water in/around the carbeurater. Hope this helps... If it does please do not forget to accept the solution or post back for assistance.


Daniel

Posted on Aug 05, 2010

  • Al Spiegelhalter
    Al Spiegelhalter Aug 06, 2010

    Do you know anything about the JD 445 engine?

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Do you know anything about the JD 445 engine?

Posted on Aug 06, 2010

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Does your tractor have points or is it electronic controlled ignition?
If points, replace them and the condenser, make sure the gap is correct as a too wide of a gap will make them open sooner--which advances your timing and could cause a carb backfire.
If electronic, check the timing position of your reluctor / pick-up coil as specs. illustrate.
I am assuming you are 100% sure of the cam/crank gear alignment. On some engines, it is possible to accidentally install the cam 180 degrees out if not careful.
Regardless, you have a ignition timing problem- too advanced, OR you have a sticky intake valve, or intake valve not seating properly allowing the combustion explosion to enter the intake or carb throat area.

Posted on Aug 06, 2010

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You MAY be timed 180 degrees out. Sometimes the timing marks also have to have the crank in a particular position OR the other possibility and more likely is the distributor has become 180 out. If you rotated the shafts while the gears were off, this is the most likely cause.

Posted on Aug 04, 2010

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  • Fred Yearian Aug 05, 2010

    The distributor will be where the ignition wires from the plugs go, but changing it 180 is often very hard..



    To correct the situation, I would remove the timing gear and rotate the cam shaft 360 degrees and re-install the gear to the timing marks.



    The distributor is often geared down with a 2:1 ratio which can result in a 180 degree timing error if the shaft has been rotated a full revolution before installing the gear..

  • Al Spiegelhalter
    Al Spiegelhalter Aug 05, 2010

    What drives the distributor? I see nothing on the camshaft that would drive the distributor. If there is nothing on the camshaft gear to change the timing of the distributor rotating the camshaft gear will do nothing. I realize the crankshaft turns serveral times before the camshaft makes one turn.

  • Fred Yearian Aug 05, 2010

    Backfiring through the carb means the intake valves are NOT closed and there is a charge of fuel in the cylinder.



    One other thing is to check that the method of lining up the indexes is what the manufacturer specifies. I have seen some that do not line the indexes to eachother but offset them. This sounds like a gross mosalignment though. An insidious one would be if they changed the design and the marks are not right for your particular engine.



    How many cylinders does this have? If the engine uses magnetos from the flywheel a VERY common problem is that the keyway of the flywheel has sheared and the flywheel is now off timing for the magnetos. This happens OFTEN if the engine is subjected to a sudden load of a mower hitting an obstruction. In this case, one has to pull the flywheel and replace the shear key.

  • Al Spiegelhalter
    Al Spiegelhalter Aug 06, 2010

    Do you know anything about the JD 445 engine?

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Check the fuel filter, check the spark plug, make sure the carburetor is not clogged  also clean  out the carburetor bowl. Also check is the plug is firing and the engine has compression.
take carb apart and soak it in carb cleaner for a few hours, then blow out every hole with carb cleaner .also check the gas cap.Remove it and clean it and replug it.the gas cap must be releasing pressure or blocking pressure.

also check the   flywheel key.

Check this.If its not helping then try this 

John Deere  equipment engines have been equipped with carburetor anti-backfire solenoids to reduce the chance of engine backfire or "after bang" at shutdown.  This anti-backfire solenoid effectively reduces the possibility of backfire in most engines by stopping fuel flow to the carburetor when the key is turned off.  Some engines that still exhibit backfire at shutdown can see further reduction by putting the throttle at between ¼ and ¾ position prior to turning off the ignition.
After engine break in of 50 hours run time, the throttle position used may include moving the throttle to the idle setting without producing a backfire at shutdown.
If your unit does not have the anti-backfire solenoid, a different engine shutdown procedure will more likely give you better results.  Try moving the throttle to slow idle for 15 to 30 seconds, and then turn the engine off. 
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.





Posted on Aug 04, 2010

  • Al Spiegelhalter
    Al Spiegelhalter Aug 06, 2010

    Do you know anything about the JD 445 engine?

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If the timing is set correctly the the carb may need to be adjusted. These are the two things that can and will cause backfire.

Posted on Aug 07, 2010

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What drives the distributor? I see nothing on the camshaft that would drive the distributor. If there is nothing on the camshaft gear to change the timing of the distributor rotating the camshaft gear will do nothing. I realize the crankshaft turns serveral times before the camshaft makes one turn.

Posted on Aug 05, 2010

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Hi,
Visit to the given link and buy the service manual. in 90% cases these manuals contains the information which can be repaired without the help of technician. If you are lucky then you will get the query solved...
http://www.gardenlawnmowers.info/?s=john+deere+445+wiring+diagram
Thanks....

Posted on Aug 05, 2010

  • Al Spiegelhalter
    Al Spiegelhalter Aug 06, 2010

    This doesn't help me here and now.

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