QuestionQUESTION: Hello John,
I have a Sears tractor with the above mentioned engine. It had a bad oil leak so I replaced the engine base gasket. Once all put back together, it will crank and not start. I have spark at the spark plug and fuel(I can smell it on the plug). It seem that I have pressure pushing out from the carb. as it is pushing fuel out. When I pulled the spark plug it also seems to be pushing pressure out instead of in. Could I have effected the timing by removing the engine base or oil pan as I would call it.
Thanks,
Rich
ANSWER: Hello Rich:
If All you did was Remove the Sump/Oil Pan/Engine Base and Replaced the Gasket; then the Only Mistake you May have Made was Not Getting the Governor Shaft Ear on the Internal Governor. If you Did Not Remove the Cam or the Crankshaft During this Repair, the Timing will be Correct. Send me the Model and Type or Spec Numbers Off the Engine, Please. With these I can Locate the Proper Manual and Better Assist you. The Model Numbers May be Stamped Into the Blower Housing (metal engine cover) Above the Spark Plug. Thanks.
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 8pm EST (US). My New Day Starts then. Thanks.
Respectfully
John
---------- FOLLOW-UP ----------
QUESTION: Thanks John,
The engine model # is 28N707, type 0171-01.
When trying to start, it must be making subtle attempts as the exhaust pipe feels slightly warn, even though I really don't hear it firing. Also, how would the internal governor gear affect starting?
Thanks again for your help.
Rich
AnswerHello Again Rich:
The Internal Governor Holds the Throttle Valve in the Full Throttle Position when the Engine is Not Running. When Starting the Governor Does the Same. Until the Engine Kicks and Actually Starts Running; the Governor is Holding the Carburetor Throttle Valve at Full Throttle. This Allows for Maximum Jetted Gas to Enter the Engine During the Choke Process and this Allows for Quicker Starts. As Soon as the Engine Starts you have the Governor Spring and Internal Governor Working Together to Maintain a Steady, Governed RPM. If the Internal Governor is Not Holding the Throttle Valve at Full Throttle, then it is Hard for the Engine to Draw Enough Gas to Start when Cold. Other Possible Causes for this are: 1- Improper Valve Clearances. **I Do Not Use the Setting Called for by the OEMs. I have Found that the Following Works Best. Remove the Valve Cover (on the Dead Cylinder for Twin Cylinder Engines). Set the Cylinder you are Setting the Valves on to Top Dead Center (Both Rocker Arms will have Play in them when the Engine is at TDC) on the Compression Stroke When Setting the Valve Clearance. Now Loosen the Valve Adjuster Locks and Set the Intake Valve Clearance to .004in -.006in and the Exhaust to .007in - .009in. I have had Better Performance Out of the Mowers and Less Burnt Valves Using these Settings. Be Sure the Piston is at TDC on the Compression Stroke.** 2- Damaged Flywheel Key. The Following is the Instruction File I Made for Correcting this Problem. It is the Basics and if you have a Question, Please Ask. ***Remove the Blower Housing (metal engine cover). Remove the Flywheel Nut or Starter Cup (Depends on the Model). Now Attach a Steering Wheel Puller to the Flywheel Using the Threaded Holes in the Flywheel. Tighten the Puller. Now Hit the Puller with a Hammer. Repeat this Procedure Until the Flywheel Pops Up or can be Lifted Off the Crankshaft. On Some Models you Can Not Use a Puller and Must Use a Pry Bar and a Pipe Cap that is Slightly Larger than the Crankshaft. Place the Pipe Cap Over the Crankshaft to Protect it. Place the Pry Bar Under the Thick Section of the Flywheel and Pull Up Against the Flywheel. **BE CAREFUL DO NOT PUT A HOLE IN THE BLOCK UNDER THE FLYWHEEL** Now Hit the Pipe Cap that is on the Crankshaft (covered with the Pipe Cap). Repeat the Procedure Until the Flywheel can be Lifted Off the Crankshaft. *** Now Replace the Key Between the Flywheel and Crankshaft and Reverse the Procedure. Be Sure you have the Flywheel Torqued to at Least 00 - 00 Foot Pounds. The Key Times the Plug Firing and is Not Designed to Hold the Flywheel from Turning on the Crankshaft. The Flywheel Nut or Starter Clutch Torque Does that.** If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. 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 8pm EST (US). My New Day Starts then. Thanks.
Respectfully
John
