Small Engines (Lawn Mowers, etc.): 18hp Briggs, question pool, air leak


Question
QUESTION: Model:422447  Type: 4155
I am having problems with the engine running only at high speed. I can make it slow down by using the lever on the governor. Even with the throttle set to idle it over revs. I have taken the carb off and cleaned it. Just wondering if the intake has an air leak if that would cause that problem. Any help would be GREATLY appreciated. p.s. I have checked the springs on the governor and both are attached.

ANSWER: Hello David:

Sorry for the Delay. This Question was Located in the Question Pool. Has the Governor Arm been Removed from the Governor Shaft? If Yes, then To Reset the Governor; Loosen the Governor Arm Bolt and Turn the Governor Shaft Clockwise Until it Stops. Using the Governor Arm Hold the Carburetor to Full Throttle. Now with the Shaft Full Clockwise and the Governor Arm and Carburetor Held at Full Throttle, Tighten the Governor Arm Bolt. If the Engine Still Runs Full Throttle, then Reverse the Rotation of the Governor Shaft, but Still Hold the Carburetor at Full Throttle with the Governor Arm. If it Still Runs at Full Throttle, then Check the Internal Governor. Hope this Helps. I am Here if You Require More Assistance. Let me Know What Happens, Please. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 9pm EST (US). My New Day Starts then. Thanks.

Respectfully

John

---------- FOLLOW-UP ----------

QUESTION: Thanks John for your reply:

The governor has never been off of it and it is tight now. I can put a spring on the throttle to "lock" it in one position and it runs great but thats just a band aid on it and I would love to have it fixed properly. I don't mind taking the motor apart to put another governor in it if thats the problem but with my limited knowledge of diagnosing the problem, I need someone smarter than me to do it and I sure appreciate any help. Thanks in advance.

Answer
Hello Again David:

If you Push on the Governor Arm to Rev the Engine; Can you Feel Pressure Pushing Against you as you Rev the Engine? If No and the Governor Arm has Not been Loosened or Removed from the Governor Shaft, then the Internal Governor is Broken. To Replace the Governor: This is a Simple Process. Drain the Oil and Remove the Engine to the Work Bench with the Oil Pan Facing Up. I have a Wooden Rest that was Especially Made to Hold the Engine when in this Position. Remove the Oil Pan. After All the Oil Pan Bolts are Removed; Tap Lightly on the Sides of the Oil Pan to Loosen it from the Dowel Pins. When the Oil Pan is Removed, you can See the Governor Resting on Top of the Cam Gear. Lift Off and Replace with a New Governor. Check the Engine Block for Debris from the Old Governor and Wipe the Inside of the Block With a Rag, Until Clean. Set the Governor So it is Resting on the Governor Shaft and Carefully Replace the Oil Pan. Remember to Replace the Oil Pan Gasket. If the Crankshaft Seal Was Not Leaking, then Leave it Alone. It Should be OK. You can Easily Replace it While Mounted on the Machine if Required Later. Make Sure the Governor Stays in Contact with the Governor Shaft while Replacing the Oil Pan. Re - Mount the Engine to the Machine. Refill With Oil. These Instructions are Basic. Your Internal Governor May Differ. You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.smallenginepartswarehouse.com/parts.asp and Select the Shop Online Parts Look Up. Then Select the Model Tab. Then Select the OEM and Enter the Model and Type Numbers (422447-4155). Then Double Click on the Model in the Results Area. Now you can Select the Section of the Engine you Wish to View. Hope this Helps. I am Here if You Require More Assistance. Let me Know What Happens, Please. Thanks.

Good Luck

Respectfully

John