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Yanmar engines 20 hp engine in john deere tractor makes loud clacking noise

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Listen if sound is high or low on the engine ! If high poss valves bent or piston slap ! If low crankshaft mains or bigends gone ! If head you can remove it and see damage but if any contact with pistons all out ! So Either way remove motor and strip and repair ! Dont skimp on parts , happy engine = happy owner ! P...

Posted on Dec 11, 2013

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Not good,dump it

Posted on Oct 16, 2013

  • rilaxson
    rilaxson Nov 30, 2013

    Loose tappet maybe

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How to set leakage on yanmar engine , 3T90T-J


Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
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JD 400 Garden tractors were made from 1975 - 1983.
Serial Numbers
1975: 30001
1976: 55001
1977: 70001
1978: 80001
1979: 95001
1980: 120001
1981: 155001
1982: 190001

Go to this site and you may be able to track it down.
John Deere 400 attachments
http://www.tractordata.com/lawn-tractors/000/0/4/41-john-deere-400-attachments.html

Be sure to read this discussion on serial numbers.

Tractor serial numbers

"Find the REAL serial number
There are usually a lot of different numbers on a tractor. The engine, front axle, and cab may all have their own serial numbers. Various components may have parts or casting numbers. Make sure you have actually found the tractor serial number, and not one of these other numbers."

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