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  #1  
Old 09-14-2018, 01:52 PM
C&O2-10-4 C&O2-10-4 is offline
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Default 3240 engine problem

Recently my CCC 3240 would backfire when I shut it down, ( I do throttle down before I turn it off); anyway I was mowing the other day for several hours and all of a sudden it just quit, I believe I heard a pop when that happened. I can't get it started, could I have a bent engine valve ? cannot see anything wrong, no oil, or crack in the engine block.

C&O2-10-4
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Old 09-14-2018, 01:54 PM
J-Mech J-Mech is offline
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We can't see inside your engine.

Engines need 3 things to run: fuel, air, and ignition. Figure out which one of the 3 it isn't getting.
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Old 09-14-2018, 03:07 PM
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cooperino cooperino is offline
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Quote:
Originally Posted by J-Mech View Post
We can't see inside your engine.

Engines need 3 things to run: fuel, air, and ignition. Figure out which one of the 3 it isn't getting.
Dont forget compression! Won't run without that
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Old 09-14-2018, 03:39 PM
J-Mech J-Mech is offline
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Originally Posted by cooperino View Post
Dont forget compression! Won't run without that
That goes in with air.
If the piston isn't moving, no air.
If a valve is stuck open, or isn't opening, it isn't getting air.


Hard to think a running engine suddenly wore out the rings, or a valve isn't sealing good. An engine will run with very, very low compression. Just not well.
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Old 09-14-2018, 04:15 PM
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cooperino cooperino is offline
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Originally Posted by J-Mech View Post
That goes in with air.
If the piston isn't moving, no air.
If a valve is stuck open, or isn't opening, it isn't getting air.


Hard to think a running engine suddenly wore out the rings, or a valve isn't sealing good. An engine will run with very, very low compression. Just not well.
No Jon, sorry. There is always air in the carb and cylinder. Even when its not moving. If a valve becomes bent and wont close you get zero compression. Engine wont run. Your "you need 3 things to run" is an extremely old school term and I'm older than you. You need fuel, ignition, and compression to run an engine. They used to call it four things but air was omitted as it is ambient or always around so unless your trying to burn fuel on the moon. Your good.

Air is not compression.
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Old 09-14-2018, 04:48 PM
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RLause RLause is offline
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Tell grain elevator operators you need compression for dust to explode. Gasoline vapor doesn't need compression to burn.
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Old 09-14-2018, 06:37 PM
J-Mech J-Mech is offline
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You can't have compression without air.
Fuel will burn without compression. Just won't make any power.
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Old 09-14-2018, 06:47 PM
Merk Merk is offline
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No Jon, sorry. There is always air in the carb and cylinder. Even when its not moving. If a valve becomes bent and wont close you get zero compression. Engine wont run. Your "you need 3 things to run" is an extremely old school term and I'm older than you. You need fuel, ignition, and compression to run an engine. They used to call it four things but air was omitted as it is ambient or always around so unless your trying to burn fuel on the moon. Your good.

Air is not compression.
Jon is correct.

In my 50 plus years working on engines I never heard there was 4 things needed to make an engine run. All my teaching manuals never said there was 4 things to keep an engine running. I've learned, I've taught anyone who wanted to learn, was an Ohio State Fair small engine judge for years. I do seminars at 2-3 different tractor shows every year. Expert I'm not....still learning....

I used to train local Vo-ag kids to compete in a local small engine trouble shooting contest. They had 6-8 different stations where the ag students had to answer questions or the best one was trouble shoot an engine. They had to fix 3 different things in 30 minutes. One of the best one was putting tape around the air filter and putting pre cleaner on so it didn't show the tap. Someone posted that air is ambient or always around. In this case air wasn't
ambient or always around. Remove the tape from the air filter and the engine ran. What was simulated was a plug air filter.

My current job is trying to keep 50 golf carts and 20 grounds keeping machines running at a local golf course.
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Old 09-14-2018, 08:36 PM
nophun nophun is offline
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Quote:
Originally Posted by C&O2-10-4 View Post
Recently my CCC 3240 would backfire when I shut it down, ( I do throttle down before I turn it off); anyway I was mowing the other day for several hours and all of a sudden it just quit, I believe I heard a pop when that happened. I can't get it started, could I have a bent engine valve ? cannot see anything wrong, no oil, or crack in the engine block.

C&O2-10-4
Does it have spark? Air filter good, fuel to the carb? Check these first, then a compression test if the basics check out.
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Old 09-14-2018, 10:15 PM
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Originally Posted by Merk View Post
Jon is correct.

In my 50 plus years working on engines I never heard there was 4 things needed to make an engine run. All my teaching manuals never said there was 4 things to keep an engine running. I've learned, I've taught anyone who wanted to learn, was an Ohio State Fair small engine judge for years. I do seminars at 2-3 different tractor shows every year. Expert I'm not....still learning....

I used to train local Vo-ag kids to compete in a local small engine trouble shooting contest. They had 6-8 different stations where the ag students had to answer questions or the best one was trouble shoot an engine. They had to fix 3 different things in 30 minutes. One of the best one was putting tape around the air filter and putting pre cleaner on so it didn't show the tap. Someone posted that air is ambient or always around. In this case air wasn't
ambient or always around. Remove the tape from the air filter and the engine ran. What was simulated was a plug air filter.

My current job is trying to keep 50 golf carts and 20 grounds keeping machines running at a local golf course.
50 years huh.. ok. Show me an engine running with zero compression... you cant. It dont work that way. Period.

In my 30 plus years as a mechanic... I have never had a car , truck, tractor, or any piece of equipment come in with tape hidden around the air filter.
I have worked on all of the above with dirty air cleaners. They all ran poorly and rich but they all ran. I have never had a engine not run at all due to dirty air filter and unless you work in extremely high dust environment or severe duty atmosphere all the time I doubt anyone else here has either.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.

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