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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 17650
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I have a 24 hp twin cylinder Briggs & Stratton engine in my

Resolved Question:

I have a 24 hp twin cylinder Briggs & Stratton engine in my lawn tractor. The engine ran fine when I turned it off 1 week ago. When I when to start it again, the engine would crank over, but would not start. I replace the spark plugs with new ones, I poured a small amount of gasoline in the carburator. The engine would crank over, but it still refused to run. There are several kill switches on the mower, but I am not sure that is the problem. Any suggestions?
Submitted: 2 years ago.
Category: Small Engine
Expert:  Curtis B. replied 2 years ago.

curtis b :

Welcome to JUST ANSWER small engines, let me try to help you !!

curtis b :

Pull spark plug and wiyh plug grounded see if you have spark.

curtis b :

If no spark ,locate the single kill wire that goes to the twin coils and unplug it, then check for spark again.

curtis b :

If you now have spark, check the kill wire and the ignition switch, one could be grounding the coils.

Expert:  Curtis B. replied 2 years ago.
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Customer: replied 2 years ago.

I pulled the new spark plugs out and left the magneto/coil wires attached to the plugs and cranked the engine over several times. I didn't get a spark out of either plug. I could not locate the single kill wire you described between the magneto/coils. I disconnected the two twin magneto/coils, I took them to a local lawn mower repair shop to have them checked. Both of the magneto/coils checked out BAD. I ordered 2 new replacement magneto/coils. It will take several days before the parts come in and I am able to install them. We will then see if the engine starts.

 

I have another tractor problem that may or may not be related to the magneto/coil problem. The battery keeps running down after a couple of uses and I then have to recharge the battery to start the tractor. This tractor has an electric PTO (power take off) unit that engages the cutting blades and draws heavily upon the battery when activated. Is there an alternator on this engine and could it also be going bad? If there is, where is it located and how do I have it checked ?The battery is relatively new and holds a good charge when It is recharged. Is there anything else that would keep the battery from recharging?

 

I forgot to give you detail info about this engine. it is a 24 hp Intek V Twin engine

by Briggs and Stratton.

Model : 445677

Type:0413 E1

Code: 050523 YG

I purchased it in 2006.

 

Expert:  Curtis B. replied 2 years ago.
The alternator is under the flywheel and has a regulator mounted on the engine. Two wires come from under the flywheel and go to the regulator. A single wire goes from the regulator to the starter solenoid. Start by checking battery voltage with key off, then read the battery with the engine running at full throttle, with engine running, the voltage should increase at least one volt. Then turn on the pto clutch, the voltage has to stay above 12 volts. If not, then the regulator and alternator need to be checked.
Customer: replied 2 years ago.

Curtis,


I am still waiting on the 2 magneto coils to install on my Briggs and Stratton 24 hp twin cylinder engine for the lawn tractor. What is the gap that is needed when reinstalling the magneto coils?

Expert:  Curtis B. replied 2 years ago.
Gap needs to be .008 to .012 in.
Customer: replied 2 years ago.

Curtis,


I installed the 2 new magneto coils, but the engine still will not start. I put a small amount of gasoline into the carburator, cranked the engine over, but it does not ignite the gas and ocassionally a load "pop" will occur. Any suggestions?

Expert:  Curtis B. replied 2 years ago.
Pull the valve covers and check the pushrods and valves. Be sure they are working. With spark and fuel, engine should have started for few seconds, if not, could be valve problem. That is what I would try next! Need to eliminate the valves!
Customer: replied 2 years ago.

Curtis,


I pulled the valve covers from each cylinder and found a bent and disconnected push rod in each. Good call. Can I straighten and reuse the push bars or must I purchase new ones?

Expert:  Curtis B. replied 2 years ago.
Get new ones, you can replace the aluminum ones with steel.
Customer: replied 2 years ago.

Curtis,


I have already staightened the one slightly bent aluminium push rod and the one slightly bent steel push rod (one from each cylinder). Since it is a weekend and I might not get the new replacement parts until Monday, is it possible to use the straightened push rods temporailly until then? Also, there is a star adjustment screw at the base of each push rod seat, does this need to be readjusted? If so,, how do I make this adjustment?

Expert:  Curtis B. replied 2 years ago.
You could try them, I don't recommend it! Here is the Briggs site with the valve information. And yes they should be adjusted.http://www.briggsandstratton.com/support/frequently-asked-questions/Servicing%20the%20valves/
Customer: replied 2 years ago.

Curtis,


Why would the upper and lower push rods be bent to each of the rocker arms ? What does this indicate about the valves themselves? Is there a


potential problem here I should be looking for?

Expert:  Curtis B. replied 2 years ago.
I think it is just a Briggs thing, does not seem to be any reason, it just happens. See it a lot on the Briggs engines. Usually just replacing the pushrods is all that is required, and valve adjustment.
Customer: replied 2 years ago.

You suggested changing all the aluminium pushrods to steel ones. Is there any reason that Briggs does not use all steel ones to start off with in the first place? The aluminium rod besides having a greater diameter also has a somewhat flatened circled ball at the end. The steel rod does not have this flatened section and is perfectly round at the end. Why the difference?

Expert:  Curtis B. replied 2 years ago.
I don't know the why, I just know there have been plenty of the aluminum ones replaced with the steel ones!
Customer: replied 2 years ago.

Curtis,


I have installed new steel pushrods into each valve lifter, the lower valve lifter on the left hand side keeps bending the pushrod. What is the problem?

Expert:  Curtis B. replied 2 years ago.
Is the valve stuck?
Customer: replied 2 years ago.
I believe the valve is stuck. Can it be unstuck?
Expert:  Curtis B. replied 2 years ago.
Remove spark plug and feel for the piston, be sure piston is down, away from the valves, then oil the stem and tap on the valve with hammer, and see if you can get it working freely.
Customer: replied 2 years ago.

Curtis,


Success!!! I followed your instructions on how to unstick the non moving valve that was bending all the pushrods. I placed a block of wood against the stuck valve lifter and gave it a swift hit with a hammer. The valve came unstuck. I straightened out the new bent steel pushrod and reused it. I made the adjustments to the valve lifter


clearances and put all the pieces back together. It started right up and smoked for awhile because of the oil I squirted into the cylinder to free up the stuck valve. All seems to be working well at this time. Thank you for your help.


 


RW

Expert:  Curtis B. replied 2 years ago.
Good job! Thank you!
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 17650
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert
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