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John Deere 445. I would like someone who knows about this tractor answer the question as to why after replacing the camshaft why the motor backfires through the carb. If you read through all of my questions and solutions, you will see the solutions are not accurate. Please help

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It sounds like the camshaft timing is off. Did you have some marks to match up when you put in the new camshaft?

Posted on Jul 09, 2014

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I would like to know the proper way to time the camshaft gear with the crankshaft gear - John Deere Model 445

Posted on Aug 14, 2010

  • lagol Aug 14, 2010

    If I take a compression on the two cylinders, if it is 100psi (I am not sure what the compression is) would that be sufficient enought to make sure the valves are OK. What happens when I remove the camshaft and rotate the crankshaft 360 degrees?

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Of the 100+ camshaft replacements that I personly have done on the 425/445 and John Deere Gators I have come across 3 that backfired when completing the replacement.2 were do to bent valves coming in contact with the piston after gear failed and 1 was from a sheared flywheel key.The only other time I had this same injected engine backfire was on a John Deere gator 620i that had a faulty computer and fired @ 90 derees off.Do a compresion check and that will help out alot.

Posted on Aug 07, 2010

  • James Brown
    James Brown Feb 04, 2016

    USE A DIAL INDICATOR ON INTAKE VALVE AND A TIMING WHEEL ON CAMSHAFT. After learning how and why to use these you will find out 2 things: intake valve is burned/not burned and/or 2) valve is opening too soon thereby letting combustible charge leak back into carb and fire when plug fires. Good Luck derfly

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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...


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

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JD Model 445 - Plastic gears. After replacing the new camshaft I need to adjust the valves. Does anyone have the specifications?


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How can I tell the year of my John Deere 445 lawn tractor. Product # M00445C096237 ?


1993: 010001
1994: 020001
1995: 030001
1996: 040001
1997: 050001
1998: 060001
1999: 070001
2000: 080001
2001: 090001

http://www.tractordata.com/lawn-tractors/000/0/4/45-john-deere-445.html

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