JD 70 that wouldn't run

andy r · Nov 1, 2015

Several days ago I posted about a John Deere 70 gas that wouldn't run. It had progressively gotten worse over several hours. Had newer points and condenser in it. I originally thought that the gas bulk truck had stirred up water in the storage tank when they delivered fuel. I drained 10 gal of gas out of the tractor. Rinsed the tank with some new gas. Put new non alcohol gas in the tank. I also had taken the carburetor off and checked every hole and passage for flow. Still no resolve. Last week I bought a new condenser and installed it today. Tractor started right up and runs great. Waterlogged gas and a bad condenser were the most common recommendations. Just thought I would report back what I found. Thanks. Andy

fixerupper · Nov 1, 2015

We almost never used to hear about condenser problems but today it's common and a weak condenser will make a two lunger act like it's running lean. A weak spark needs a richer mixture and choking lowers the cylinder compression a bit, allowing a weak spark to still do the job though modestly. If the fuel has water it will show up in the sediment bowl. If you have any residual water after flushing it will be in the sediment bowl in a short time if you use regular gas. Otherwise you can use ethanol to emulsify it and burn that water in the engine as long as there isn't gobs of water still in the tank.

Den N Ms · Nov 1, 2015

Andy,Next time if it ever happens again open the drain valve on the bottom of the carb and catch the gas in a pint jar and look for water in the bottom.also look for water in the sediment bowl, drain and clean the sediment bowl first.

M-MAN · Nov 2, 2015

Thanks for having the courtesy to post back.

JD 70 that wouldn't run

andy r

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fixerupper

Well-known Member

Den N Ms

Well-known Member

M-MAN

Well-known Member

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