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Briggs and stratton model 300424

mag cover reinstall/timing

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#1 JBIowner OFFLINE  

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Posted September 28, 2016 - 10:46 AM

I am refurbishing a Briggs and Stratton 14 hp cast iron engine from my JBI Bush Hog tractor.  The engine is a model 300424 and I believe the series is a 0023.  I am about ready to put the motor back together, but I have some concerns with an issue with the mag side motor cover.  There is a counter weight gear inside this cover and I believe the gear needs to be in a particular timing position relating to the overall operation of the motor.  There is a method to get the timing gear in the correct position to the cover to go back on, but it looks to me like the motor piston/valves/etc. should also be in a particular position when this cover/gear is reinstalled.  Can any one give me some direction as to how this relationship should be set?  Thanks for any help you can furnish.



#2 JBIowner OFFLINE  

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Posted September 28, 2016 - 03:17 PM

I think I have finally found the answer to my question noted above.  This was listed in a service manual so I hope this will get me back in sync.   I have copied the following to assist anyone that may have the same problem.  

 

see Fig. 184.

  1. With piston at exactly TOP DEAD CENTER, torque drive gear bolt(s) (with 1/4" (6 mm) rods in place) to 200 in. lbs. (22.6 Nm). Be certain piston does not move.

  2. Remove the 1/4” (6 mm) rods.

  3. Install idler gear(s).

  4. Install snap in “E” rings to retain gears. No further timing is necessary, Fig’s. 183 and 184.

Time Counterweight

  1. Remove the timing hole screw from cover assem- bly, Fig. 185.

  2. Insert a short piece of 1/8" (3 mm) rod through timing hole in cover and into machining hole in counterweight, Fig. 185. The rod holds the coun- terweight in the proper position while cover is installed on engine.

1

Fig. 184 INSTALLING AND TIMING PTO DRIVE GEAR

The counterweights and ball bearings are an integral part of the covers and cannot be serviced. Lubricate ball bearings and gears with a few drops of engine oil.

NOTE: Piston must be at top dead center. 


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#3 sacsr OFFLINE  

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Posted October 03, 2016 - 08:09 PM

Sorry I am not any help with the internal workings on most of these motors. Good you have figured it out!


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#4 crittersf1 OFFLINE  

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Posted October 12, 2016 - 04:10 PM

Did you get it running?


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#5 JBIowner OFFLINE  

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Posted November 02, 2016 - 03:50 PM

Not yet.  A new problem has occurred.  I was attempting to replace the rings when I found that the new ring set I ordered does not fit the engine.  This is a B & S 14 hp engine (model 300424) and the B&S part number listed in their manual does not fit the engine per the B&S service manual service manual.  I am at a bit of a stalemate until I can find a correct ring set.  Any suggestion would be appreciated.



#6 JBIowner OFFLINE  

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Posted November 23, 2016 - 11:01 PM

Did you get it running?

Yes, I finally got it going.  After I finally found the correct rings another problem appeared.  The engine would not start.  I went in many direction on tracking down the problem.  One was a concern for the timing which involved disassembling the engine to double check the timing marks on the internal gears.  That checked out ok, so then I started to question my electronic conversion.  I verified that the magnets on the flywheel were correct.  At that point I reinstalled the original point set and verified their timing relationship to the flywheel and top-dead-center of the piston.  That all checked out ok which helped me eliminate the potential for variances with my electronic module.  I then arrived on the conclusion that the timing and ignition were correct, so it left me with a fuel/air focus.  I next did a compression test on the valves/piston.  The exhaust was tight along with the piston rings.  The compressed air however was blowing out the intake valve, back through the carb.  I pulled the head and reground the intake valve, but was unable to get the finish I thought I needed to seal the valve to it's seat.  I then purchased a new valve, ground the valve to the seat and reinstalled the valve.  Amazaing next step was the engine immediately started up.  It is now back in the tractor and runs great!  No smoke or banging noise!



#7 crittersf1 OFFLINE  

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Posted November 25, 2016 - 11:26 AM

Cool!!!


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