snow blower engine bent pushrods - Snowblower Forum : Snow Blower Forums
 
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post #1 of 6 Old 01-24-2016, 09:57 AM Thread Starter
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snow blower engine bent pushrods

Hi

I was given a 2011 platinum 30 (model 921018) that would not start.
Engine is B & S OHV 342cc.(model 21m314 type 2121f1)

Electric starter was missing and pull cord did not work.Fixed the recoil starter
but engine was turning over hard enough to damage cheap recoil mechanism.
Removed valve cover and found bent push rods.After removing head found exhaust valve guide had slid out of place.Also the lower part of the intake valve was blueish... sign of overheating?? To make a long story short I pressed the guide in place lapped valves and installed head with new push rods and head gasket.

Engine started right up ,I removed a few drifts of snow in the drive and when I dropped the throttle to idle speed the engine backfired and stopped.It would not start.

Apparently this is common with this engine.The the valve guide was out of place again and exhaust push rod bent.

Has any one had this problem and would a new or good used head with tight valve guides solve the problem? The backfiring problem should not push out a valve guide if the head has not overheated.

Thanks...Flattop
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post #2 of 6 Old 01-24-2016, 10:14 AM
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Hmm, maybe a good candidate for a $300 Predator? Sounds like something is up with that engine. Possible to fix, but how much money are you going to spend hoping the next thing fixes it?

Are the valves overheating and expanding and jamming in the guides?

Are those guides supposed to be peened in place? I think on some you are suppose to take a punch and put a little dent in both ends to hold them in.

Please direct all snow blower questions to the forums and not to me with PMs.
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post #3 of 6 Old 01-24-2016, 10:14 AM
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did you check the head and block to make sure they are plane? head or block tha isnt true would most efinately be a sign of overheating.. resolving this should resolve the warping issue.. warped heads or block needs to be either planed by a machine shop or changed out

maybe a repower would be easier on the wallet??

1984 Columbia 10hp-33in
2015 Columbia 420cc 28in 3xHD
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post #4 of 6 Old 01-24-2016, 10:35 AM
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Usually the guide would need to be staked in, to prevent future movement. If the machine is worth it, just buy a new head. Or check ebay for a good used one.




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post #5 of 6 Old 01-24-2016, 11:05 AM Thread Starter
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I checked the head and it is not warped.I called the guy who gave it to me .He says he gave it a hard time but after it backfired an stopped it still turned over but would not start so I assumed the engine did not stick but could have overheated since the intake valve stem is blue at the base .The valve stems are not scored.These engines run lean and hot to meet EPA standards and backfire unless you slow them down slowly, tend to backfire. But this should not damage engine.A new head is expensive with the low Canadian dollar but a good used one is feasible .The rest of the sno-thro is like new.
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post #6 of 6 Old 01-24-2016, 05:49 PM
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tap the guide back in then put some lapping compound on the exhaust valve stem n run it in the guide bore. the blued stem tells me it getting tight in the guide. fatten up the carb a bit to drop operating temp,
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