Hs40 needs help - Snowblower Forum : Snow Blower Forums
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post #1 of 13 Old 02-25-2015, 08:59 PM Thread Starter
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Hs40 needs help

The old 4hp needs a rebuild I think, I've got all the ignition parts, I've replaved them befor seems like low compression?I can turn it over with my hand? Do I need rings, do i need oversized 10 or 20 piston? is it valve lash? it runs for 5 min then just stops, and had no power, (1973) is this something I can tackle do I need a machine shop? It's one of these I get parts when I can get up some money?
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post #2 of 13 Old 02-25-2015, 09:09 PM
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Sounds like valve lash could definitely be a problem. Google "Tecumseh l head service manual" to find out how to measure and correct it if necessary.

Likewise, the manual will tell you how to check the ring gap. Needing rings is much more likely than needing a piston.

If you have the measurement tools or are able to take the engine to a machine shop to have measurements taken, here's the best process for those parts:
1) Remove piston & rings.
2) Measure cylinder bore for size and out-of-round - check against specs.
3a) If bore is worn and/or out of round, have it bored oversized and install an oversized piston and rings.
3b) If bore is okay, follow manual procedure for measuring ring gap, and if it's excessive replace rings with new standard-sized ones. If piston is excessively worn or damaged replace it with standard size, otherwise reuse it.
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post #3 of 13 Old 02-25-2015, 09:10 PM Thread Starter
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post #4 of 13 Old 02-25-2015, 09:18 PM Thread Starter
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Ok so off with the head and check the wall, if it's shinny hone it, if it's scrached or out of round bore it. So I'm looking at $100 or $200 to get that back to making power,
It was throwing 25 feet back in the day, and I neglected the oil ?

Last edited by Ken692; 02-27-2015 at 11:36 PM.
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post #5 of 13 Old 03-01-2015, 02:13 AM Thread Starter
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There's an oil seal under the flywheel it's not leaking, but I was going to look for it and it's not in the parts list? Is that unavailable ???
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post #6 of 13 Old 03-01-2015, 11:04 AM
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Looks like part number 32600 ($5) item number 4 oil seal, from Jacks.

Tecumseh HS40-55265C Parts Diagrams for Engine Parts List #1

Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)

Experience is something you don't get until just after you need it.
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post #7 of 13 Old 03-01-2015, 02:59 PM Thread Starter
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Nice
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post #8 of 13 Old 03-13-2015, 01:33 AM Thread Starter
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Yes still working on this little pain in the a--, is it a good idea to just pick up some new valves and use compound on them or is it more complicated, I guess I have plenty of time to get this running now that the worst New England winter in history is over!!!
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post #9 of 13 Old 03-13-2015, 03:45 AM
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Your on the right track if you need to keep it original, myself I'd pop a 99 dollar (this weekend sale) Predator 6.5 and and have a quieter more powerful engine on there. That is, unless it's a two shaft job, then the rebuild is the way I'd go as well.

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91' Toro Powershift 824/Predator 301cc
05' Toro 3650/ 6.5 RTek
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post #10 of 13 Old 03-14-2015, 11:38 PM Thread Starter
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Yah it's the two drive
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