QuestionGood Evening,
Murray Select Model # 425600X8A
B&S Engine #s
Model - 31D777
Type - 0235E103
Code - 311ZE
The engine turns over but will not run!
Troubleshooting with a fully charged battery:
1. Gas is getting to the carburator, combustion chamber and saturating the spark plug while trying to crank the engine.
2. Changed the old sparkplug, installed a new RC12YC. Tried it again same issue.
2.1 Disconnected the Sparkplug Wire and used a spark tester to check for proper spark. Set the tester for .030 gap, turned the engine over a few times, getting a good spark over the gap. Left the Spark Tester hooked up and performed the following.
2.2 Removed the spark plug and put my thumb over the spark plug hole and turned the engine over a few times, seems to be plenty of compression.
3. Checked the following switches indivdually:
-Clutch Brake Switch -
Brake Pedal Not Depressed / engine would not turn over
Brake Pedal Depressed / engine turns over
Seat Switch Not Depressed (Brake Pedal Depressed) / engine would not turn over
Seat Switch Depressed (Brake Pedal Depressed) / engine turns over
4. Items that weren't looked at:
Plunger / solenoid that screws into the carburator float bowl. Is this the afterfire solenoid? I used a multimeter to check resistance on the 2 X terminals, what I got was continuity instead of OHMS.
PTO Switch
Questions:
I'm getting fuel to the carb, combustion chamber, and sparkplug. Getting a strong spark to the sparkplug.
The engine is turning over but not running.
Any Suggestions what to look at next??
Thanks for your help,
AnswerOk, first things first, get to your chair it's time for class.......let's begin with some basic myths, have fuel, spark, and compression a engine will run, true or false. Go stand in the corner the answer is actually a FALSE. Lets look further as to why, it's rather simple, fuel, spark, and compression is a rather broad answer. Tom's fundamentals would be for a running engine as follows: 1> the correct amount of fuel mixture, 2> A strong snapping type blue spark, 3> The correct amount of compression, and here's one they never mention, 4> A spark at the correct time. So Chuck, do you kind of see where I am going with this? First off, if God gave us thumbs to be used to check compression he would have done it right and put a gauge on our foreheads. Meaning, you have compression, but is it the correct amount? Second, you have fuel, is it the right amount. You have spark is it strong enough?......Of the above answers I can only confirm one, you have a good enough spark. You need to know just how much compression you have, you should be looking for around 100psi minimum for a cold engine, once they have run the heat expands components and the compression rises. Also, you may have a sheared, or partially sheared flywheel key, you'll need to remove the shroud and flywheel to inspect. Get some starting fluid, give it a small shot into the carb with the air filter off does this help, and while your there is the filter clean? ........Try these and let me know if we need to go further into it......class is out........Tom
