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John Deere Tractors Discussion Forum
:

Engine problem John deere 40

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mikemul

06-22-2020 03:57:37




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i have a problem with my john deere 40, when the tractor idles there is no problem. only when you accelerate it starts to pop softly. it runs at a fixed speed but through that you hear a popping sound every now and then. who knows what this can be? I have already put new bows and bows caps on it.




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CPeter

06-26-2020 18:30:28




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
That 40 has both fuel tanks!!
Peter



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buickanddeere

06-24-2020 13:54:03




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
Are you using a high intensity timing light that flashes to illuminate the timing mork on the flywheel as the engine is running ?
Or just using a 6V test lamp across the points and are rolling the engine by hand ?



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Mikemul

06-23-2020 21:52:19




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
Quoting Removed, click Modern View to see





Here the working pictures



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M-MAN

06-24-2020 03:53:01




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 Re: Engine problem John deere 40 in reply to Mikemul, 06-23-2020 21:52:19  
From the second picture I can tell the timing is off IF the oil pump is timed correctly. It would be best to use a timing light at full throttle per the instructions from the manual.

With no timing light you have to put the rotor on and turn it to the advanced position and hold it there while you also turn the distributor to where the points have just opened and tighten it down. The point gap must be set correctly first!

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mikemul

06-24-2020 07:56:08




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 Re: Engine problem John deere 40 in reply to M-MAN, 06-24-2020 03:53:01  
I doesn’t understand the text while you doesn’t have a timing light. Put the rotor on where? And what do you mean with advanced position? You mean I set the contact point to the good value and than turn the engine to the spark mark. And than set the ignition to begin opening points ?



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M-MAN

06-24-2020 14:13:14




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 Re: Engine problem John deere 40 in reply to mikemul, 06-24-2020 07:56:08  
Yes - set the contact point to the good value and then turn the engine to the spark mark.

Next put the rotor on top of the distributor shaft where it normally goes. Turn the rotor by hand as far as it will go. It will only turn one way. This is the advanced position. When you let go the advance springs will pull it back to where you started.

Hold the rotor in the advanced position and then set the ignition to begin opening points.

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mikemul

06-25-2020 23:31:41




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 Re: Engine problem John deere 40 in reply to M-MAN, 06-24-2020 14:13:14  
Hi, i have set the ignition with the timing light at full rpm. now its much better at high rpm and no pops more. here is a video. is this how it post to be?

link: https://www.youtube.com/watch?v=X56s1bFY41M

Greetings Mike Mul



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M-MAN

06-26-2020 03:22:16




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 Re: Engine problem John deere 40 in reply to mikemul, 06-25-2020 23:31:41  
Sweet sounding now! Thanks for sharing your success story.



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Mikemul

06-23-2020 09:51:21




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
[quote="CVPost-M-MAN"](quoted from post at 15:15:34 06/23/20) No, the carbon tracks would be inside
the distributor cap. Just a dark line
that looks like you marked it with a
pencil.[/quote]

[img]https://i.ibb.co/X8KQ3R1/2-AAA2-A1-D-0302-4-C89-B58-D-2-C6233728-AC2.jpg[/img]

[img]https://i.ibb.co/V3RP4MD/45743-F55-D5-FC-4-FD5-BB86-297-BE08-D3-D7-F.jpg[/img]

Looks new, the ignition is at 7,5 degrees is this good? Or what say the factory about it?

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M-MAN

06-23-2020 18:06:22




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 Re: Engine problem John deere 40 in reply to Mikemul, 06-23-2020 09:51:21  
Links won't work. Here's the manual pages for an M. 40 & 420 is the same.




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Mikemul

06-23-2020 03:53:50




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
[quote="CVPost-M-MAN"](quoted from post at 12:22:06 06/23/20) Sorry I missed that you already set the valves. Also forgot to mention carbon tracks or a crack in the distributer cap.[/quote]

You mean carbon tracks on the sparkplug and plugcap? There a no cracks in the distrubitor cab



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M-MAN

06-23-2020 06:15:34




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 Re: Engine problem John deere 40 in reply to Mikemul, 06-23-2020 03:53:50  
No, the carbon tracks would be inside the distributor cap. Just a dark line that looks like you marked it with a pencil.



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Mikemul

06-22-2020 22:22:09




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
[quote="buickanddeere"](quoted from post at 22:56:54 06/22/20) [quote="Mikemul"](quoted from post at 16:10:49 06/22/20) [quote="buickanddeere"](quoted from post at 21:44:01 06/22/20)
Autolite non resistor 437 sparkplugs work well in those engines. Ignition wires should be solid core .
Is the popping more pronounced when the engine is cold or hot ?[/quote]

Thanks for youre comment, I wil look if there is a good contact in the wires. There is no difference between hot or cool engine. Only a problem with mre rpm stationair is great. What about the points?[/quote]
Occasionally the lobes on the distributer shaft will lift the points open farther for one cylinder than the other.[/quote]

That can be true. But how can we fix that. When I check the sparkplugs after running and they look black and not wet

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buickanddeere

06-22-2020 13:56:54




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
Quoting Removed, click Modern View to see
Occasionally the lobes on the distributer shaft will lift the points open farther for one cylinder than the other.



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Mikemul

06-22-2020 13:10:49




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
[quote="buickanddeere"](quoted from post at 21:44:01 06/22/20)
Autolite non resistor 437 sparkplugs work well in those engines. Ignition wires should be solid core .
Is the popping more pronounced when the engine is cold or hot ?[/quote]

Thanks for youre comment, I wil look if there is a good contact in the wires. There is no difference between hot or cool engine. Only a problem with mre rpm stationair is great. What about the points?

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buickanddeere

06-22-2020 12:44:01




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
Autolite non resistor 437 sparkplugs work well in those engines. Ignition wires should be solid core .
Is the popping more pronounced when the engine is cold or hot ?



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Mikemul

06-22-2020 10:55:24




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
I have set the ignition to the spark on the flywheel that the contactpoints begin opening. The flywheel Turns to fast for the light to see. I have set also the valves. I think its a problem with the carburator. Check the video here. https://m.youtube.com/user/schaap418



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M-MAN

06-23-2020 03:15:42




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 Re: Engine problem John deere 40 in reply to Mikemul, 06-22-2020 10:55:24  
I listened to the video. I don't believe that is a fuel problem. Weak points spring allowing bounce, timing, valve lash too tight, or bad manifold in that order.

A timing light only flashes when the number one cylinder fires. You can see the mark on the flywheel at any speed. I will post the page from the manual later when I can get to my computer.



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M-MAN

06-23-2020 03:22:06




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 Re: Engine problem John deere 40 in reply to M-MAN, 06-23-2020 03:15:42  
Sorry I missed that you already set the valves. Also forgot to mention carbon tracks or a crack in the distributer cap.



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Mike M

06-22-2020 08:38:25




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
Might be as simple as needing the load mixture screw opened up a bit. It is the one on the bottom of the carb.



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buickanddeere

06-22-2020 08:14:12




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
it is a two cylinder odd fire engine sharing one intake port and a one barrel carb. All such engines tend to have a miss on one cylinder at idle . Assuming the compression and valve lash are in spec ?
A leaking intake manifold gasket, eroded head gasket surface, eroded manifold gasket surface or a cracked/rusted manifold can also cause the stuttering and puttering.



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hotflashjr

06-22-2020 07:30:10




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
My 40 has a bit of a pop to it. That is why they are called Johnny Poppers. My MT before that did as well.

Now if it is backfiring with a bang like a gun going off that is different and something that can/should be addressed. Have you ever checked the timing? If it is backfiring I would start with making sure it is timed correctly. The best way to do this is to obtain the owners manual and follow the instructions outlined in there but use a timing light. All you need is a cheap timing light which you can find on ebay or amazon. If your 40 is 6 volt you will need a 12 volt battery to run the timing light. I have used the battery in my truck or other 12 volt tractors to do this.

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nlastovi

06-22-2020 06:34:09




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
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spark plugs and caps I believe is how this would most closely be translated.



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Jim.ME

06-22-2020 05:59:04




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
He is in the town of Biddinghuizen, in the Netherlands. We may have a bit of a translation problem.



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CPeter

06-22-2020 04:38:02




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 Re: Engine problem John deere 40 in reply to mikemul, 06-22-2020 03:57:37  
OK, I'll bite. I have had 40s and 420s for over 45 years and I have no idea what "bows and bow caps" are.

Peter



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mikemul

06-22-2020 06:18:35




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 Re: Engine problem John deere 40 in reply to CPeter, 06-22-2020 04:38:02  
My fault i mean boegies and boegiecaps



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