Tecumseh HSK850 came apart - Snowblower Forum : Snow Blower Forums
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post #1 of 14 Old 03-05-2018, 02:54 PM Thread Starter
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Tecumseh HSK850 came apart

This was in a rather nice Toro 38420 CCR 2500. Picked it up after work, brought it home. PO said it wouldn't stay running. Got it to fire on starting fluid, so thought I'd give it a chance. Pulled the carb, cleaned it in Pine-Sol in the ultrasonic cleaner. Came out great. Put it on, buttoned it all up, added a little fuel to the tank and it fired right up. Ran great, RPMs shot up to where I thought they should be. Had hearing protection on, so couldn;t hear anything funny. RPMs climbed a bit more, then it backfired, and shut down. Tried to restart it, and it was making clunking noise, and then jammed. Turned the engine in reverse by hand, then looked down in the spit cup and found three needle bearings and a bit of aluminum.

Finally got a chance to tear it down, and I'll share the carnage. I'm not sure the jug is any good. It looks like a scratch and a few dents in the intake ports. Up until now I'd never had a negative experience with a Tecumseh engine. Anyone selling a good used HSK850?

It kinda looks like this was my fault. The linkage to the governor was not connected. Must've come loose when I was installing the carb. Feeling a bit foolish, but still thought I'd share.
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post #2 of 14 Old 03-05-2018, 03:00 PM
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Oh man that stinks! It sounds like you got the diagnosis right - because of that linkage being unhooked it was probably running with the throttle wide-open all the time.

~1994 Ariens 924084 (ST1032) "papa bear": restored, re-engined, real nice!
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post #3 of 14 Old 03-05-2018, 03:23 PM
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She must been screaming at least 6000 rpms!
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post #4 of 14 Old 03-05-2018, 04:14 PM
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rip

Bought a dead but now fixed 1980ish craftsman II 10/28....ITS ONE HEAVY BEAST

MY VIDS ON FIXIN HER UP

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post #5 of 14 Old 03-06-2018, 06:39 AM
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"Came apart" must be just a more PC and a kinder gentler way of saying that you blew it up !
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post #6 of 14 Old 03-06-2018, 06:51 AM
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What was it Rolls-Royce used to say? Their cars didn't "break down", they "failed to proceed".

~1994 Ariens 924084 (ST1032) "papa bear": restored, re-engined, real nice!
1991 Ariens 924050 (ST824) "mama bear"
Toro PowerCurve 1800 "baby bear"

Be alert! America needs more lerts.
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post #7 of 14 Old 03-06-2018, 07:03 AM
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Looks broken . . .

Regards, Ted
.
Current & Past Fleet:
2017 Husqvarna ST224 (SOLD)
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post #8 of 14 Old 03-06-2018, 07:04 AM
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came apart? sounds like the nickname used by truckers for a cummins. comeaparts
hope the the op or PO had oil in the fuel? as it's kind of odd to see those rod needles fail otherwise.
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post #9 of 14 Old 03-06-2018, 08:40 AM
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Quote:
Originally Posted by old ope mechanic
". . . it's kind of odd to see those rod needles fail otherwise . . ."
Yes; it's as though those needles were thrown out of their race and were momentarily being blasted around inside the crankcase just like little bullets, ricocheting off everything and through everything . . . . even the Piston Skirt and a few went right through the Cylinder wall !

It was like a internal Nail Bomb, and luckily the walls of the Crankcase restricted those projectiles from exiting and hitting any nearby human beans !

And then all was quiet.
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post #10 of 14 Old 03-06-2018, 11:07 AM
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There's a couple of HSK850s on ebay right now, but you should make sure that those are compatible with that Toro.


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