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John Deere 425 blowing out white smoke and oil from exhaust


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#1 Ghoward OFFLINE  

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Posted April 26, 2017 - 09:42 PM

I have a 1995 John Deere 425 garden tractor. It has been sitting for a few years and I started working on it. I replaced the time delay module and rebuilt the carburetor. I got it to run but it rolls out white smoke and oil from the exhaust. I let it run for a while because I thought it would clear but it did not so I shut it down. Anyone have any ideas what could be the cause? Any help would be appreciated. FY I there was so much oil coming out the exhaust everything was covered with oil in my garage.

#2 Xrperry OFFLINE  

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Posted April 27, 2017 - 12:04 AM

Broken oil ring?

#3 Lmiller3358 OFFLINE  

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Posted April 27, 2017 - 03:51 AM

Broken ring, or is there too much oil in it ?


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#4 Billy M OFFLINE  

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Posted April 27, 2017 - 08:11 AM

Did you check the breather?  The check valve in it may be stuck/gummed up.  See if the carb has any oil in it from the breather.


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#5 karel ONLINE  

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Posted April 27, 2017 - 08:27 AM

Slow valve



#6 jms180 ONLINE  

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Posted April 27, 2017 - 10:56 AM

I would do a leak down test and see how that goes



#7 WNYTractorTinkerer ONLINE  

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Posted April 27, 2017 - 11:11 AM

So many questions left unanswered:

 

1-  How many hours on it?  How much oil?

 

1.5-  Compression test-  if it's under 180# its rebuild time..  Leakdown test will evaluate the valves also..

 

2-  Pull & read the plugs-  How do they look?

 

3-  pull the radiator cap & start it..  Does it bubble or spit out?  if so the head gaskets need replaced..  

 

4-  Then pull the oil fill cap off-  is there a lot off pressure coming out of the crankcase?  if so-  Rings are shot..


Edited by WNYTractorTinkerer, April 27, 2017 - 11:14 AM.


#8 boyscout862 ONLINE  

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Posted April 27, 2017 - 11:32 AM

Welcome to GTT. If you need the engine manual, download it from our Manuals Section. Go to the "Troubleshooting Section" and follow the diagnostic tests. The best way to to figure out what is wrong is to do the troubleshooting from a check list so that you don't miss anything. The start by checking the oil level and smell if there is any gas in it. A leaking fuel pump can dump fuel into the crankcase. The diluted oil can get by the rings. Check the breather for proper operation. Do a compression test assess the rings. Let us know how you make out. Good Luck, Rick
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#9 kencombs OFFLINE  

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Posted April 27, 2017 - 08:47 PM

So many questions left unanswered:

 

1-  How many hours on it?  How much oil?

 

1.5-  Compression test-  if it's under 180# its rebuild time..  Leakdown test will evaluate the valves also..

 

2-  Pull & read the plugs-  How do they look?

 

3-  pull the radiator cap & start it..  Does it bubble or spit out?  if so the head gaskets need replaced..  

 

4-  Then pull the oil fill cap off-  is there a lot off pressure coming out of the crankcase?  if so-  Rings are shot..

Lots of good advice there.

 

I would add this:  White smoke on a gas engine is often due to coolant entering the combustion chamber.  Makes the head gaskets suspect.






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