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tecumseh engine kicks back when starting.


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  #1  
Old 06-07-2005, 11:14:49 PM
Ken Ken is offline
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Default tecumseh engine kicks back when starting.

i bought a tecumseh h-60 6hp that i put on my model 656 wheel horse. the problem is that when i start it up it kick back on me and just about pull my arm out of the socket. it starts fairly easy but gets hot pretty quick then dies. would it be out of timming and how would i go about getting it back in time. any help or suggestions would be great. ken
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Old 06-08-2005, 12:26:21 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: tecumseh engine kicks back when starting.

If the engine has electronic ignition, the flywheel key is the timing! Tech. alters the timing by using different keys. I know of at least 3 types, and they are color coded. - gold (anodised), silver, and polished (bright aluminum) If the key shears, the engine may still run, depending on where the flywheel is located on the crank. If the engine has points, check for sheared key, and check the location of the timing - magneto assembly - it may have moved, advancing the timing. Also check point gap - should be .016" Too wide a gap, makes the timing advanced. Some Tech. engines depend on a secondary source of weight on the crankshaft for the engine to run smoothly. If this engine is running bare shafted, it must have a cast iron flrwheel to run properly! the Aluminum flywheel is too light.
Andrew
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Old 06-08-2005, 09:38:38 AM
Mac Leod Mac Leod is offline
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Default Re: tecumseh engine kicks back when starting.

we have a briggs engine that does the same thing...give the cord a tug and get your arm dislocated...I pulled the shroud to see the fly wheel and key (no electric ignition)...all looks fine. the engine was never run when we bought it, it is from the 70's...I thing that perhaps the cam was put in one tooth advanced?

Mac Leod
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Old 06-08-2005, 08:37:35 PM
Ken Ken is offline
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Default Re: tecumseh engine kicks back when starting.

Thanks Andrew and Mac Leod for your information about my tecumseh 6 hp. It was very helpful when i get ready to tear into it. Im also going to talk to a lawn mower man that sold me the engine. Thanks again!!!
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Old 09-02-2017, 09:11:30 AM
bucketfull bucketfull is offline
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Default Re: tecumseh engine kicks back when starting.

I have a B&S engine 135292/0158-01. It is on a troy bilt tiller. My orginal problem was while tilling the engine locked up. Thought it just overloaded. When I tried to pull to crank would not move. I removed the engine and all I could find was a missing key for timming gear. Put it back together, started let it run a couple minutes. Next day tried to start and get that unbelivable hard kick back? I'm thinking valves. Do I need to remove the tappets to replace the valves.
Thanks,
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Old 09-03-2017, 12:39:05 PM
Ogrebeast64 Ogrebeast64 is offline
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Default Re: tecumseh engine kicks back when starting.

The following link may be of some help with the kickback problem: https://www.youtube.com/watch?v=x8whgnLsTq8
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Old 09-03-2017, 12:49:53 PM
sprkplug sprkplug is offline
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Default Re: tecumseh engine kicks back when starting.

I'm betting that you sheared the flywheel key. The clutch or nut has to be tight. Many think that the key is responsible for securing the flywheel to the crank, but in reality the key is just for locating/timing purposes. What holds the flywheel to the crank is the taper on the shaft. So the nut/clutch has got to be tight. As in specified torque tight.

I am confused however. Are you saying that the engine wouldn't turn and that replacing the key cured the issue? Was the missing key jammed somehow? I'm not following the connection?
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Old 09-03-2017, 01:04:45 PM
3v0 3v0 is offline
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Default Re: tecumseh engine kicks back when starting.

I had a little briggs 3hp L head that was doing the rip your arm out thing. The key was not sheared. Lapping the flywheel to the crankshaft fixed the problem.
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Old 09-03-2017, 01:26:06 PM
sprkplug sprkplug is offline
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Default Re: tecumseh engine kicks back when starting.

Quote:
Originally Posted by 3v0 View Post
I had a little briggs 3hp L head that was doing the rip your arm out thing. The key was not sheared. Lapping the flywheel to the crankshaft fixed the problem.
So the flywheel was loose and still didn't shear the key? Whenever I see that 3hp rating, I first think of vertical shaft pushmower engines. Briggs uses light flywheels on engines destined to have a blade mounted right to the crank, and attempting to start one of those without the blade on will certainly leave you shaking your hand and muttering under your breath. Depending upon original application , some horizontal shaft engines could be had with light flywheels also. Sure gets ones attention.
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Old 09-03-2017, 03:13:13 PM
Greg Mosley Greg Mosley is online now
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Default Re: tecumseh engine kicks back when starting.

Greetings, Depends on what Model your vintage Tecumseh is. If your engine is equipped with breaker set , you must thread a special fixture in the sparkplug hole with a dial indicator. The engine is rotated till the piston is X number of thousands BTDC. (Refer to Tecumseh repair manual for specs.) A tool which looks like a flashlight with 2 leads is attached to the breaker set. The breaker plate is then rotated to the proper position with the aid of this tool. Static timing is then set correctly. If the engine has been kicking back replace the flywheel key as the slightest impression with cause issues. Enuf Said.
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Old 09-03-2017, 04:01:32 PM
sprkplug sprkplug is offline
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Default Re: tecumseh engine kicks back when starting.

Maybe not quite enough said ^^^^^^^........we're working on a Briggs!
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Old 09-03-2017, 04:26:25 PM
akuna akuna is offline
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Default Re: tecumseh engine kicks back when starting.

Gosh, I thought it were a Tecumseh H60?
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Old 09-03-2017, 04:32:40 PM
sprkplug sprkplug is offline
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Default Re: tecumseh engine kicks back when starting.

Quote:
Originally Posted by akuna View Post
Gosh, I thought it were a Tecumseh H60?
Nope, read through the entire thread, paying attention to dates posted. It switches gears halfway through.
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Old 09-03-2017, 04:45:17 PM
Thaumaturge Thaumaturge is offline
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Default Re: tecumseh engine kicks back when starting.

Responding to Briggs kickback... You might check / cleanup ground lead connection on coil. SCRs (Thyristors) are sometimes sensitive little buggers. Just a noisy connection can cause them to fire. The new solid state coils use them.
Doc

Attached is a schematic of a solid state coil... not Briggs but probably pretty close.
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Old 09-03-2017, 08:08:14 PM
3v0 3v0 is offline
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Default Re: tecumseh engine kicks back when starting.

Quote:
Originally Posted by sprkplug View Post
So the flywheel was loose and still didn't shear the key? Whenever I see that 3hp rating, I first think of vertical shaft pushmower engines. Briggs uses light flywheels on engines destined to have a blade mounted right to the crank, and attempting to start one of those without the blade on will certainly leave you shaking your hand and muttering under your breath. Depending upon original application , some horizontal shaft engines could be had with light flywheels also. Sure gets ones attention.
The thing to note is that lapping fixed the problem.
Horizontal engine from a dirty water pump and the impeller would have helped. I ran it without the pump. I could not tell the flywheel was loose. Torqued it before and after.

Link to large image of this engine.
http://1.bp.blogspot.com/-FFfEEotKMQ...2B14.28.13.jpg
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Old 09-03-2017, 11:59:24 PM
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Default Re: tecumseh engine kicks back when starting.

Yeah the original post dates back to 2005. The Briggs poster should really have created a new one.
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