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#1
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Tecumseh 6hp Engine Won't Slow
Engine started fine, ran well, but at end of mowing job, engine would
not cut back to idle. All linkages seemed OK, governor spring OK also. Nothing sticky. Stopped engine by disconnecting plug. On several restarts, engine went to high speed, no throttle control at all. Was concerned about runaway, so always disconnected plug promptly. Tried adjusting low and high speed jets, had no effect. Did not examine throttle plate. Choke plate operating normally. I'd bet this isn't a common problem. Is there an easy way to test the governor by moving the arm manually? As I say the spring seems fine. Could there be a huge air leak somewhere? Never seen anything like this before! Please advise on where to begin. I do not have the engine here now but would like to begin diagnosis as soon as I return to my camp. Thanks very much for help! Frank |
#2
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Tecumseh 6hp Engine Won't Slow
On Jun 1, 9:39�pm, frank1492 wrote:
Engine started fine, ran well, but at end of mowing job, engine would not cut back to idle. All linkages seemed OK, governor spring OK also. Nothing sticky. Stopped engine by disconnecting plug. On several restarts, engine went to high speed, no throttle control at all. Was concerned about runaway, so always disconnected plug promptly. Tried adjusting low and high speed jets, had no effect. Did not examine throttle plate. Choke plate operating normally. � � I'd bet this isn't a common problem. Is there an easy way to test the governor by moving the arm manually? As I say the spring seems fine. Could there be a huge air leak somewhere? Never seen anything like this before! � � Please advise on where to begin. I do not have the engine here now but would like to begin diagnosis as soon as I return to my camp. � � Thanks very much for help! � � � �Frank I doubt it is an air leak. I would begin by downloading/reading the parts/repair manual to MAKE sure a spring didn't come off or is missing, or the linkage is assembled incorrectly or binding. Also check for dirt/grime build-up on linkage. Hank |
#3
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Tecumseh 6hp Engine Won't Slow
"frank1492" wrote in message ... Engine started fine, ran well, but at end of mowing job, engine would not cut back to idle. All linkages seemed OK, governor spring OK also. Nothing sticky. Stopped engine by disconnecting plug. On several restarts, engine went to high speed, no throttle control at all. Was concerned about runaway, so always disconnected plug promptly. Tried adjusting low and high speed jets, had no effect. Did not examine throttle plate. Choke plate operating normally. I'd bet this isn't a common problem. Is there an easy way to test the governor by moving the arm manually? As I say the spring seems fine. Could there be a huge air leak somewhere? Never seen anything like this before! Please advise on where to begin. I do not have the engine here now but would like to begin diagnosis as soon as I return to my camp. Thanks very much for help! Frank Can you still control the engine speed by using the throttle on the carb and not the governor? To me it sounds like the governor gear inside the engine is worn out. |
#4
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Tecumseh 6hp Engine Won't Slow
Thanks Hank. Very old engine, no manual (V60 Tecumseh)
The linkage has been carefully checked, but will check again. Also, nothing appears binding, have used WD-40. Also the throttle cable is moving the throttle plate through its full rotation. On Tue, 2 Jun 2009 02:31:41 -0700 (PDT), "Hustlin' Hank" wrote: On Jun 1, 9:39?pm, frank1492 wrote: Engine started fine, ran well, but at end of mowing job, engine would not cut back to idle. All linkages seemed OK, governor spring OK also. Nothing sticky. Stopped engine by disconnecting plug. On several restarts, engine went to high speed, no throttle control at all. Was concerned about runaway, so always disconnected plug promptly. Tried adjusting low and high speed jets, had no effect. Did not examine throttle plate. Choke plate operating normally. ? ? I'd bet this isn't a common problem. Is there an easy way to test the governor by moving the arm manually? As I say the spring seems fine. Could there be a huge air leak somewhere? Never seen anything like this before! ? ? Please advise on where to begin. I do not have the engine here now but would like to begin diagnosis as soon as I return to my camp. ? ? Thanks very much for help! ? ? ? ?Frank I doubt it is an air leak. I would begin by downloading/reading the parts/repair manual to MAKE sure a spring didn't come off or is missing, or the linkage is assembled incorrectly or binding. Also check for dirt/grime build-up on linkage. Hank |
#5
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Tecumseh 6hp Engine Won't Slow
Thanks U. I am praying that is not the case *but* no, I cannot control
the engine speed with the throttle. I am not able to access the engine again until early next week but I am positive I checked this. In making certain the linkage to the throttle lever was adjusted correctly I observed the small plate at the top of the throttle shaft as it went through its full rotation. What I *cannot* say for certain is that the shaft and plate were actually moving but I considered that to be so unlikely I didn't look further. Understand that the engine started and ran perfectly throughout the mowing, and it was only when shutting down that this occurred. So it was sudden. Frank On Tue, 2 Jun 2009 07:08:37 -0700, "Ulysses" wrote: "frank1492" wrote in message .. . Engine started fine, ran well, but at end of mowing job, engine would not cut back to idle. All linkages seemed OK, governor spring OK also. Nothing sticky. Stopped engine by disconnecting plug. On several restarts, engine went to high speed, no throttle control at all. Was concerned about runaway, so always disconnected plug promptly. Tried adjusting low and high speed jets, had no effect. Did not examine throttle plate. Choke plate operating normally. I'd bet this isn't a common problem. Is there an easy way to test the governor by moving the arm manually? As I say the spring seems fine. Could there be a huge air leak somewhere? Never seen anything like this before! Please advise on where to begin. I do not have the engine here now but would like to begin diagnosis as soon as I return to my camp. Thanks very much for help! Frank Can you still control the engine speed by using the throttle on the carb and not the governor? To me it sounds like the governor gear inside the engine is worn out. |
#6
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Tecumseh 6hp Engine Won't Slow
Thanks Don- this was a new carburetor as of a couple of years ago
and I can't imagine that happening, but will surely check. Also I will look for loose bolts on the engine side of the carb which could allow air to be drawn in unintentionally. On Tue, 2 Jun 2009 21:28:40 -0500, "Don Young" wrote: "frank1492" wrote in message .. . Thanks U. I am praying that is not the case *but* no, I cannot control the engine speed with the throttle. I am not able to access the engine again until early next week but I am positive I checked this. In making certain the linkage to the throttle lever was adjusted correctly I observed the small plate at the top of the throttle shaft as it went through its full rotation. What I *cannot* say for certain is that the shaft and plate were actually moving but I considered that to be so unlikely I didn't look further. Understand that the engine started and ran perfectly throughout the mowing, and it was only when shutting down that this occurred. So it was sudden. Frank On Tue, 2 Jun 2009 07:08:37 -0700, "Ulysses" wrote: "frank1492" wrote in message ... Engine started fine, ran well, but at end of mowing job, engine would not cut back to idle. All linkages seemed OK, governor spring OK also. Nothing sticky. Stopped engine by disconnecting plug. On several restarts, engine went to high speed, no throttle control at all. Was concerned about runaway, so always disconnected plug promptly. Tried adjusting low and high speed jets, had no effect. Did not examine throttle plate. Choke plate operating normally. I'd bet this isn't a common problem. Is there an easy way to test the governor by moving the arm manually? As I say the spring seems fine. Could there be a huge air leak somewhere? Never seen anything like this before! Please advise on where to begin. I do not have the engine here now but would like to begin diagnosis as soon as I return to my camp. Thanks very much for help! Frank Can you still control the engine speed by using the throttle on the carb and not the governor? To me it sounds like the governor gear inside the engine is worn out. Your symptoms point to a throttle plate which has come loose from the throttle shaft. The engine cannot run at high speed if the intake passage is blocked closed by the throttle plate. So if rotating the throttle shaft does nothing, there must not be a plate attached to it or the plate is deformed so as not to close properly. Just remove the carburetor and see what is going on with the throttle. Be very careful not to mess up the springs or linkage. Don Young |
#7
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Tecumseh 6hp Engine Won't Slow
Dumb I am. After all this, it was just a loose idle adjust screw that
threaded inward with lightening speed when the engine vibrated. I thought these were supposed to be held in place by a spring, but the spring was missing. I few smacks with a hammer and now the screw binds. I knew the screw was loose but never thought it could advance that fast!! Apologies to all the folks who worked so hard on this! Frank On Tue, 2 Jun 2009 21:28:40 -0500, "Don Young" wrote: "frank1492" wrote in message .. . Thanks U. I am praying that is not the case *but* no, I cannot control the engine speed with the throttle. I am not able to access the engine again until early next week but I am positive I checked this. In making certain the linkage to the throttle lever was adjusted correctly I observed the small plate at the top of the throttle shaft as it went through its full rotation. What I *cannot* say for certain is that the shaft and plate were actually moving but I considered that to be so unlikely I didn't look further. Understand that the engine started and ran perfectly throughout the mowing, and it was only when shutting down that this occurred. So it was sudden. Frank On Tue, 2 Jun 2009 07:08:37 -0700, "Ulysses" wrote: "frank1492" wrote in message ... Engine started fine, ran well, but at end of mowing job, engine would not cut back to idle. All linkages seemed OK, governor spring OK also. Nothing sticky. Stopped engine by disconnecting plug. On several restarts, engine went to high speed, no throttle control at all. Was concerned about runaway, so always disconnected plug promptly. Tried adjusting low and high speed jets, had no effect. Did not examine throttle plate. Choke plate operating normally. I'd bet this isn't a common problem. Is there an easy way to test the governor by moving the arm manually? As I say the spring seems fine. Could there be a huge air leak somewhere? Never seen anything like this before! Please advise on where to begin. I do not have the engine here now but would like to begin diagnosis as soon as I return to my camp. Thanks very much for help! Frank Can you still control the engine speed by using the throttle on the carb and not the governor? To me it sounds like the governor gear inside the engine is worn out. Your symptoms point to a throttle plate which has come loose from the throttle shaft. The engine cannot run at high speed if the intake passage is blocked closed by the throttle plate. So if rotating the throttle shaft does nothing, there must not be a plate attached to it or the plate is deformed so as not to close properly. Just remove the carburetor and see what is going on with the throttle. Be very careful not to mess up the springs or linkage. Don Young |
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