Intermittent spark

[markseven 89]

Not sure but im getting frustrated trying 

To figure it out.

Cleaned points and .020 set at.

Have a good 12 volt to coil

All new wires .

New coil  .

Kohler k301  12 hp

Will not start 

Everything is basically new other 

Than the sparkplug  and sparkplug wire. 

Edited 17 hours ago by markseven
Yyy

[Achto 30,555]

12 hours ago, markseven said:

Not sure but im getting frustrated trying 

 

Intermittent spark ??? Are you losing spark at high RPMs, when it gets warm, or all the time?

 

Cutting out at high RPMs could be the condenser.

Cutting out after a short period of time could be wrong coil - "with out an internal resistor". Battery voltage builds up above 13vdc and collapses the coil.

Cutting out all the time could be dirty points or a bad plug. After you file or run sand paper through the points, you should follow up with paper or a dollar bill. Could also be a bad wire connection.

Edited 4 hours ago by Achto

[markseven 89]

I found the problem. 

Had this bolt to tight. 

It should actually be a 

Pin and cotter key.

It was putting to much pressure on the crankshaft towards the flywheel side

And actually turning engine over hard.

Causing a voltage drop enough to 

Cause the intermittent spark.

 

[Ed Kennell 44,171]

Is this engine not equipped with an axial thrust bearing to handle the thrust from a manual PTO.    Seems the Manual would exert more thrust than tightening that bolt on the lectric PTO ?      

 

 

But, I guess we never start up with the manual PTO engaged.    Might be interesting to bypass the PTO safety switch to see if one would start with it engaged.

 

Still thinking about this.    The engaged manual PTO exerts  a true axial force at the center of the shaft which the thrust bearing can handle.

 

Tightening the bolt shown exerts a bending force on the electric PTO bearings that may be causing enough friction in the PTO to make the engine difficult to start.     

Edited 14 hours ago by Ed Kennell

[Retired Wrencher 6,289]

8 hours ago, Ed Kennell said:

Is this engine not equipped with an axial thrust bearing to handle the thrust from a manual PTO.    Seems the Manual would exert more thrust than tightening that bolt on the lectric PTO ?      

 

 

But, I guess we never start up with the manual PTO engaged.    Might be interesting to bypass the PTO safety switch to see if one would start with it engaged.

 

Still thinking about this.    The engaged manual PTO exerts  a true axial force at the center of the shaft which the thrust bearing can handle.

 

Tightening the bolt shown exerts a bending force on the electric PTO bearings that may be causing enough friction in the PTO to make the engine difficult to start.     

Good info there and Ed.

[markseven 89]

Very possible bending force.

Upwards ? / downwards?

Crankshaft end play was adjusted 

To 20  thousands recently. 

Wouldn't think pushing directly

In on Crankshaft would be enough to

Make it turn over hard.

And it was turning over 

Hard because I removed 

The flywheel screen and was turning it by hand and in certain spots  

It was difficult to turn. 

[953 nut 63,658]

Wen encountering a new problem it is best to ask yourself what you did just before the problem began. 

[markseven 89]

Right ✅️