QuestionHi John,
I recently got a raw deal on a lawnmower from an internet auction site. There are two main problems with it, 1. Petrol blows out the exhaust when trying to start it, 2. Oil leaks straight through and out the bottom of the lawn mower. Regarding 1, I have pulled the motor apart and checked the valves which are moving freely. My guess is that there is something wrong with the carb / throttle area. I pulled that apart too and couldn't notice anything obvious, except that the float in that cup thing didn't always move freely. But it seemed ok. So, when there is petrol in the tank, it wont start as its flooding. When the petrol runs almost dry, the motor starts and runs until its completely empty (a matter of seconds). I think that the fuel flow system from the tank to the engine (carb area) has something wrong. It lets too much petrol through. I had a good look at the throttle which didn't seem to do much when you move it back and forward, can't really understand how it works. Regarding 2, I have the motor off the body and am trying to replace the sump seal. I can't see how to get to where it sits without pulling the bottom of the engine off. Have tried this, but there is a thick part on the shaft (where the blade bolts on)that I can't get off. How do you do this? A better question might be, how do you replace the sump seal. I have no idea what I'm doing, just working on intuition. Your help would be hugely appreciated.
Cheers
Maikel
AnswerHello Maikel:
1- To Stop the Flooding Problem: Remove, Disassemble and Soak the Carburetor Overnight in Carburetor Cleaner (I Use Gunk). I have Found that Most People can Use a Breakdown/IPL and Disassemble the Carburetor Enough for Proper Cleaning. You Only have to Remove the Bowl, Float Pin, Float and Needle Valve and Any Adjustment Screws that Go Into the Carburetor Body. The Welch Plugs Do Not have to be Removed. Then Soak the Carburetor Body and Parts in a 1 Gallon Can of Gunk Carburetor Cleaner Overnight. The Can has a Parts Tray Inside it for the Small Parts. Once the Carburetor and Parts are in the Cleaner, you can Replace the Lid for Safety and to Prevent Accidental Spillage. Then Blow Out the Passages with Compressed Air. Install New Parts if Required. If this is a Briggs Engine, then You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.outdoordistributors.com/ and Select the B. Then Select Briggs and Stratton. Then Select Don't have Part Numbers. Then Select the File #. Then Select the Folder #. If this is a Tecumseh Engine, then You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.outdoordistributors.com/ and Select the T. Then Select Tecumseh. Then Select Don't have Part Numbers. Then Enter the Model Numbers. Then Select your Model and Download the File for Online Viewing. 2- To Remove the Oil Seal from the Sump: You can Use a Screw Driver and Carefully Pry the Old Seal Out from Aroung the Crankshaft. If you are Going to Remove the Sump to Replace the Seal, then Sand the Crankshaft First, before you Try to Remove the Sump. The Crankshaft and Sump have a Mating Surfase and this is a machined Fit. If the Crankshaft has Rust , Dirt or a Bur on it the Sump will be Hard to Remove and it will Usually Scar up the Sump Mating Surface if the Crankshaft is Not Cleaned. Here are the Instructions for Replacing the Internal Governor. They have the Instructions for Removal of the Sump from the Engine. **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. Sand the Crankshaft and Lubricate with a Small Amount of Engine Oil. Now to 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.**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
