snowblower 5hp tecumseh stalling under load

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  #1  
Old 02-23-08, 12:26 AM
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snowblower 5hp tecumseh stalling under load

This is a Yard Man snowblower, probably an early 90's model 5 hp tecumseh. I just got it this season, so I don't know how well it was maintained but it starts on the first pull and sounds smooth and quiet. I put a new plug in it. On the first appreciable snow today, I warmed it up well, then proceded to blow the 2-4 inches of powder and it stalled several times and I had to really inch it to keep it running. When it was blowing, the engine speed sounded very low. When it did stall, it started right back up. What can I try? This thing starts so easy, I'd like to get it running correctly...
 
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Old 02-23-08, 04:56 AM
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You didn't give model, spec of 5hp Tec, which would help, but here is thread from yesterday where geogrubb points to a picture of the bowl nut that holds carb bowl on that serves as the main jet.
Quite possibly if you remove and thoroughly clean and reinstall, it could solve your problem since the engine runs ok at idle but not when load is applied.
http://forum.doityourself.com/showthread.php?t=335983
thanks geo,
hope this helps,
thanks,
 
  #3  
Old 02-23-08, 07:24 AM
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It is a model - HS50-67267H

Let me know what you can about this engine / carb - Thanks
 
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Old 02-23-08, 09:14 AM
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You can download service manual for your engine from the link below. Have a good one. Geo
http://www.cpdonline.com/692509.pdf
Another site for the manual
http://www.toprake.com/index.php?mod..._Document_id=2
 

Last edited by geogrubb; 02-23-08 at 02:05 PM.
  #5  
Old 02-23-08, 09:33 AM
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Thanks but when I click that I get "the page cannot be displayed" is this loading for anyone else?
 
  #6  
Old 02-23-08, 09:35 AM
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You can download illustrated parts list of engine by entering 67267H at the following site:
http://www.landscapepower.com/tecumseh_partslists.html
Before we go any further, does the carb have an adjustable jet on the bottom of carb, or is there just the bowl nut?
The original carb part no. is 632107, which looks like it may have the adjustable main jet, another site shows this carb's replacement to be 640084B, which just has the bowl nut.
You can enter 640084B in the model no box and get carb breakdown at:
http://www3.sears.com
let us know,
thanks,
 
  #7  
Old 02-23-08, 09:42 AM
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I have the blower on its side with the carb casing off now - it has the screw and spring under the bowl. Now what?? THanks
 
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Old 02-23-08, 11:03 AM
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The cpdonline website must be doing maint today, they're generally up for the service manual download, another site to get manual is:
http://toprake.com/index.php?module=...position=11:11
Due to age of unit, I would remove carb, completely disassemble, and thoroughly clean using spray can carb cleaner, I use Wal-Mart blue can, cleaning out all passages and orifices, then blow dry with compressed air, be careful not to blow out the inlet needle seat.
If you choose to soak in a carb dip, you will need to buy a new inlet needle seat and inlet needle.
You might for grins, first lightly seat, finger snug, the main jet on bottom of carb then turn out 1 1/2 turns, then use it to see if it helps.
thanks,
 
  #9  
Old 02-23-08, 02:40 PM
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I did this and now seems to be running very strong, though I need some fresh snow to test. Upon engaging the auger I hardly hear the engine speed drop now, where before just doing that seemed to really drop the RPMs. BTW - what is the needle seat? I did bring the High speed screw out as far as possible while still keeping it running smoothly. Will keep you posted when new snow arrives - thanks
 
  #10  
Old 02-23-08, 03:40 PM
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Keep trying to download the service manual mentioned previously, it will show all aspects of the carb,
again, the main jet on bottom should be out only 1 1/2 turns and the idle jet on side should be out 1 turn. you can tweak some from those settings.
Keep giving us the feedback,
thanks,
 
  #11  
Old 02-24-08, 03:29 PM
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Tecumseh RPM

I can not believe that this is being discussed right now.

I too have been working on the exact same snow thrower, same engine, etc. It is a 1988 and is "branded" MTD.

My thrower does not throw the snow far enough.

Everything seems to be in good condition and I suspect that the RPM is too low. I did not find it at the parts and service manual downloads and MTD doesn't seem to have that info at their site.

Does anybody have rough idea what the correct maximum RPM should be for this machine?

Many Thanks
Bob
 
  #12  
Old 02-24-08, 07:30 PM
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Bob, the top speed of almost all small walk behind snowblower engines is 3600 R.P.M. Thanks, Roger
 
  #13  
Old 03-11-08, 10:55 AM
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Here's a follow-up on the RPM question -- how do I know how fast my machine is running? I have a Toro 421 with the 4HP Tecumseh on it, and while it does run well, I think it isn't at full speed. I can get it to run faster with some adjustment, but I don't know how far is "too far" without some way to measure engine speed.

Tips?
 
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