Question about John Deere 4010,4020 Tractor Basic Carburetor Repair

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I have a blown head gasket on a 1970-72? 4020 john deere 6 cyl. diesel should i rework the head? what are the chances of the head being warped?

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6ya6ya
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Posted on Jan 02, 2017

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  • 14 Answers

SOURCE: 1969 John Deere 4020 won't start

Replace solonoid

Posted on May 29, 2009

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SOURCE: 4020 w/ 24v system sparks when the battery is connected

I usually fix electrical problems by process of elimination. Disconnect the wires attached to generator and touch the battery cable to the battery if it still arcs disconnect the regulator. continue until you find whats pulling current from the battery.

Posted on Jun 05, 2009

wilsodfarm
  • 986 Answers

SOURCE: i need a diagram for the battery wiring on a 1969

They came out with 24

Posted on Jul 29, 2009

wireguy212
  • 1627 Answers

SOURCE: I have a John Deere 2020 diesel. I can't get the fuel pump off

You need to remove the nut under the cover in front of the pump and then borrow a tool from a j.d dealership to pull the coupler off the pump,you may need the dealer to do this because they have a no lend pollicy for their special tools.Hope this helps.

Posted on Nov 10, 2009

  • 172 Answers

SOURCE: my john deere 990 wont start. it's not getting

Check there is adequate fuel to supply engine. Check there is no damage to fuel lines and that the fuel filter is not plugged. Yours is a Yanmar diesel engine withe an autobleed feature which is supposed to bleed the air out of the system automatically. It may incorporate an electric fuel pump also, but some don't. You can prime the fuel system to the injection pump with the manual lift pump if it is equipped with it. After establishing fuel to the injection pump, loosen the nuts that hold the fuel lines onto the injectors approximately1 1/2 turns. Turn the engine over until you see fuel coming from the injector nuts. Tighten the nuts to 24 inch/lbs of torque, start the engine and run at 1/3 throttle untill it runs smooth.

Posted on Jan 04, 2010

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2 Answers

Have john deere d120 ride single cyl B&S 21hp they are prone to head gasket failure after 50 hrs.Would having the head retensioned reduce this happening would valve clearances need rechecking. Thanks


has the head gasket failed already or are you surmising that it will happen soon
having the head studs re-tensioned would help reduce the possibility of it happening as the studs are small in diameter and can stretch and loose tension
it would be advisable to check the valve clearance as B&S valves tend to stretch and that makes start when hot difficult

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1 Answer

Compression in a 1966 john deere tractor its a 2020


is this a multi cylinder diesel farm tractor or what
remember that questions go global and you have to be specific in details as a jd unit 202 in your country may be a 1212 or what ever in another country
however moving on , if it has more than 2 cylinders , the problem can be a head gasket blown between adjacent cylinders , cracked head or valve problem ( burnt or incorrect valve adjustment)
same ideas apply to petrol engines as well

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I have a 5.7 Oldsmobile diesel engine I recently chance the head gasket because it was running hot it died on me while I was driving now it would not start back up. And everything back together could it...


If it was running before you did the head gaskets and now it died and won't start, the problem is not warped heads. Your best bet now would be to pick up a copy of Haynes Diesel Engine Repair Manual, part # 10330. This has an excellent section on the GM 5.7, for repair and diagnosing. The book is about $20 and should be available at an auto parts store.
If this isn't an option it would be wise to take it to a diesel repair shop.

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and you can't just follow the fuel lines from pump why ??
cyl 1 is always one most forward

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1 Answer

J power and smokes white


Possibly a head gasket problem (as the head heats up it warps slightly, allowing coolant to seep into the cylinders, which is the source of the white smoke--steam) Is the motor using coolant?

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I have a 750 john deere oil is in the radiator and is over heating. how can i fix it ?


Sounds like a rebuilld is in order. You probably have a blown headgasket or worse warped heads permitting the oil going into the cooling water. This work is best left to a shop with proper tools.

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John deere 3800 forage chopper tractor's horse power requirement


I run a lot of choppers. More hp the better. We had 6-cyl. diesel 90 to 120 is best.

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1 Answer

Radiator water in oil of my John Deere 310A backhoe. What steps do I take to repair.


You have either a blown head gasket, cracked block or craacked head. Major work ahead. Hopefully, the water didn't mess up your main bearings.

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