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We have a 1968 john deere 4020 diesel. it has good oil pressure,starts…

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We have a 1968 john...
We have a 1968 john deere 4020 diesel. it has good oil pressure,starts good but has a knock (does not sound low like bearing noise) we changed frt pump bushings,injector pump was rebuilt.If you could give us some of your professional advise it would be greatly appreciated. thank you Mike Schlarbaum
Submitted: 10 years ago.Category: Agriculture and Farm Equipment
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Answered in 4 minutes by:
5/3/2012
Mechanic: Curtis B., Technician replied 10 years ago
Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 43,952
Experience: Technican turned service manager on multiple lines of equipment and rental equipment.
Verified

koboma :

Did you run engine and test with the front pump drive off? If you loosen one injector line at a time can you isolate it to one cylinder?

koboma :

Knock can be anything from piston pin or piston being loose on the connecting rod. O noise from a fuel transfer pump that the spring has come out of.

koboma :

With stethoscope type listening device, Harbor Freight, Listen for knock and see if you can determine location.

koboma :

$4.00

koboma :

Even a bad injector nozzle can cause a fuel knock.

koboma :

If you isolate the location, then the knock can be evaluated.

koboma :

?/

koboma :

We owned a 4020 for years and the front pump drive was always going out.

koboma :

Knocks are like oil leaks, you have to find the source or you can't fix it. Let me know. Thank you.

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Curtis B.
Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 43,952
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Experience: Technican turned service manager on multiple lines of equipment and rental equipment.

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