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case 411 backfire

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Drewbee90

03-01-2010 17:25:47




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my case 411 will not start due do the engine backfiring. every time I try to start it, the engine coughs and turns the flywheel the wrong way and it grinds at the starter. iv already broken the starter several times due to this problem. Is there a way to correct this problem and how?




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El Toro

03-03-2010 09:43:12




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 Re: case 411 backfire in reply to Drewbee90, 03-01-2010 17:25:47  
Take a careful look at your cap to make sure there's no tiny cracks. If this looks ok I would pull No1 sparkplug and bring that piston to TDC on the compression stroke. When your're at TDC both valves should be closed and your timing marks should be aligned. Also your rotor should be pointing to your No1 plug tower. If it's off, something has jumped timing. Hal



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billy jo

03-03-2010 05:21:18




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 Re: case 411 backfire in reply to Drewbee90, 03-01-2010 17:25:47  
Might want to check compression. I have had push rods jump out and cause backfire.



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Howard H.

03-02-2010 14:47:57




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 Re: case 411 backfire in reply to Drewbee90, 03-01-2010 17:25:47  

Did it start backfiring gradually over time?? Or all of a sudden??

A worn, tight, or chipped valve internally in the engine can cause that... But a worn or tight valve usually will start that more gradually...

Or a cracked or wet distributor cap or plug wires out of order can cause that also.

Or as Jim said, being out of time...


Howard



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Drewbee90

03-02-2010 15:51:17




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 Re: case 411 backfire in reply to Howard H., 03-02-2010 14:47:57  
it has done that over time. at first it was running rough and then it started backfiring alot while trying to start it.



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JGarner

03-02-2010 05:18:58




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 Re: case 411 backfire in reply to Drewbee90, 03-01-2010 17:25:47  
Sounds like your distibutor is 180 degrees out of time and you might be firing on the exhaust stroke. If not that far out your distributor is severely out of adjustment causing it to fire at the wrong time in the compression cycle.

Jim



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Drewbee90

03-02-2010 13:07:17




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 Re: case 411 backfire in reply to JGarner, 03-02-2010 05:18:58  
Is there a simple way to adjust the distributor to the correct timing?



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JGarner

03-02-2010 16:13:13




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 Re: case 411 backfire in reply to Drewbee90, 03-02-2010 13:07:17  
When I put my breaker point plate back in after switching to a Pertronics module I got my distributor way out of whack. What I did was pull No. 1 plug, plug the hole with finger and bumped the starter slowly until I got a pressure blow. Then removed the bell housing cover plate just behind the pan so I could reach in with a pry bar and move the flywheel by hand with the bar, take extereme care not to damage the ring gear. I looked in the bell housing inspection hole so I could see the tining marks on the fly wheel. Moved the fly wheel until the correct marks lined up with the pointer. You will have to know what the timing is for your engine (TDC, X degress BTDC, etc.). Pull the dist. cap off. The points will probably be closed at this point. Now using a simple light bulb type electric current tester. Hook the aligator clip to one side of the points and put the test pointer on the other side and the bulb should light up. Rotate the distributor until the light goes out which indicates the points just broke contact. This should get you in the ball park and get the engine running. Don't forget to tighten the clamp down to keep vibration from turning the distributor. The tractor should start and run.

Jim

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Drewbee90

03-02-2010 19:23:08




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 Re: case 411 backfire in reply to JGarner, 03-02-2010 16:13:13  
Thanks for the advice. Im thinkin that this is the solution to the problem. ill just have to wait and see



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Drewbee90

03-07-2010 17:04:22




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 Re: case 411 backfire in reply to Drewbee90, 03-02-2010 19:23:08  
the backfiring stopped. the engine sputters a few times but it wont turn over. i put some fresh gas in but that didnt do much either. what do you think i should do now?



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