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John Deere Tractors Discussion Forum

3020 white smoke

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Author  [Modern View]

09-20-2019 17:16:43

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I have a 3020 diesel with about7000 hours on it. started it up this morning. Had a slight knock which quit quickly. Idle was rough so gave it a little throttle and heard the knock again and white smoke out of exhaust.
didn't seem like it wanted to shut off .Looked around, checked oil and water. Oil didn't
look dark and ugly like a diesel, was was dark but not coal black.
History . Always change oil regularly, never uses hardly any oil, A hay tractor. did have fuel tank out to fix a leak a couple weeks ago. Been a good running tractor up until.
was thinking injection pump ? fuel pump ? Could fuel injection pump cause it to knock ?


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09-20-2019 17:32:12

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 Re: 3020 white smoke in reply to robert23239, 09-20-2019 17:16:43  
Loud diesel knock is usually caused by an injector that's stuck open, or has a broken spring. Either will allow fuel into the chamber too early, causing the knock. If engine still has the knock at idle, loosen each injector line to find which one makes the knock. An injector that's stuck open will have engine compression pressure blowing backwards through the injector.

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