Tecumseh SnowKing Engine with a bad intake valve - How to tell
ฝัง
- เผยแพร่เมื่อ 24 ก.ค. 2024
- Despite seeing this fairly regularly on late-model Tecumseh Snow-King engines, I wasn't able to find a good video on TH-cam highlighting the symptoms. This engine is fairly low hour, but the intake valve is leaking and causing the engine to run poorly, and backfire under load.
- วิทยาศาสตร์และเทคโนโลยี
Ah, finally a new video, and the topic is just up my alley! I love Tecumseh engines, thanks :) I highly disagree on the conclusion though, this is such a minor problem that a relapping of the valve and resetting the clearance would be worth it in any case, especially as these engines are no longer made. However, different people have different opinions :) Greetings from Germany!
Ok i have the exact problem, removed and rebuilt carb to no avail. Still nehaves just as in this video.
I strongly disagree . I have only had one Tecumseh that needed a valve job in past 20 + years. Overall , I think their built fairly well & last well past 30 years. I recently aquired a 1979 roper snowblower with 6 horse Tecumseh that runs downright awesome . All I needed to do was freshen up carb & change oil.
Yeah ive got 2 flathead tecumseh snowblowers one of em my dad made a good engine out if two bad ones they both need a valve job and are a bit hard to start but they are rough and iffy i thing thats just how flatheads are😂 OHVs are for prettyboys that have it easy
Great to c a video from you as always 👍🏻
Great video as always Cap.
I completely agree with this video. I have a snow king Tecumseh and I changed the carb, did a valve job, new head gasket, added a rpm reader to ensure it’s running below 3600 rpm and the muffler still runs red hot and backfires. I’ve spent too many hours on this poorly made machine. I’m giving this POS away and starting over.
It's unfortunate, but these engines are just pieces of garbage. Tecumseh is one of the few American manufacturers I was not sad to see go bankrupt. They had a period of about 10 years where their products were just worthless boat anchors. No wonder the company went bust.
@@Rustbelt_Research I'd like to have it!!!!
I picked up a used Ariens 927LE with 9hp Tek snow king, did a valve job and it straight up purrs like a kitten at idle. It's not difficult to pull the valves on these motors. Totally worth doing IMO
I have a tecumseh 8hp snow-king engine and dont have any of these issues. This problem can be easily fixed. If well taken care of they can be great engines.
Hey Alan. I have a 5hp Tecumseh snow king that starts after many pulls like 10 then runs good at full speed but I have to ease it into 3-4 inches of dry light snow or it will die under load. Would you suspect valve issues? Thank you. Oh. Carb is clean.
I did a couple more checks not looking good. Compression test was 45psi. Applied air into spark plug hole and it blew right out through the muffler.
@@daveg2199 Hey how are you? It sounds like it could either be a carburetor issue (is the carb fixed jet?) Also the low compression is due to the de-compression release on the camshaft. Make sure both valves are closed before blowing air into the cylinder. I have a video on checking compression on a snow-king engine.
@@ZigZag9 Hi. Yes it a fixed jet carb. Ill look at your video on compression test. Thank you.
@@daveg2199 ... can you feel compression in the pull rope when trying to pull it?
Chances are the clearance on the valves especially the exhaust valve may be off, slightly keeping the exhaust valve open or possibly the intake valve open.
My HSSK50 5hp had bad scuff marks in the cylinder, even though I always changed the oil etc...over time it was slowely scoring up the piston cylinder. Maybe it was put together from the factory dirty or without care and like you mention it would barely move 4" of dry snow because it had very little compression. I purchased a new block, new , piston, rings and two new valves with a gasket kit for $200.00 and rebuilt it myself.
It would have been less costly and labor saving to purchase a Harbor Freight 216cc engine or bigger and swap out Tecumseh engine.
i did valve job last year and this year same problem the red glowing exhaust and the back firing to a stall
Ive always had tecumseh snowblowers ranging from 4- 12.5 hp I have a 4hp ariens apart have to do the points coil my first was a 10hp roper it was a 1979 ran that thing till the rings wore to low compression my current in use machine is a 1999-2003 craftsman 12.5 hp just made a custom threaded exhaust with canadian tire 8 hp muffler my biggest complaint on these engines is stalling under load I try to run them rich some times to point of popping black smoke after relief from heavy load now was having huge issue with craftsman because muffler broke off so was heating carb up when i installed my new threaded vs bolt on muffler woo did i have to thread out that high speed mix screw to get her happy and now she will hit the snow till she just about bogs down to a idle because loads heavy lol runs so much better but i found running them rich saves them valves also let them half speed throttle warm up or lower let everything expand slowly thats a big problem with small engines now lot of new stuff doesnt even have a throttle just operating speed lets go gotta get it down 2 to 5 years later well its shit now need new one lol
I have the very same problem, thought it was the carburator be after installing a new one I check that off the list. Thanks. I will probably regrind the valves.
I hope this isnt the problem on my 8 hp snow king but it seems to be true seeing that i replaced the carb, gasket, fuel line, primer, priner line, spark plug and clean gas tank and added fresh gas with additive:((
I have a 5.5 hp MTD yard machines 22" snowblower.... I ran some Gum-out through it because when i got it it would only run on full choke.... the gum out made it run better on half choke but if i turn the choke off it backfires alot... could this be a bad intake vale on mine?
Try seafoam, I've never used gum out, might work the same. Otherwise actually clean the carb, and if all else fails pull the head and check the valve.
@@charredskeleton I tired the Gum Out and it worked beautifully.... made it run like new again.
I just ran about a quarter bottle with half a tank of fuel and it was great.. I can now run it without the choke
If it's an ohv engine ? I'd say check & adjust your valves
Valve lash is always first. No need to do anything till that is confirmed
I have 1998 Tecumseh Power Sport 5hp best engine ever in my Manco Products InC gokart. Its great engine don’t know why people hated them.
Well my 6 horse tecumseh is 34 years old and runs like new yet so I hope it doesn't fail like this one. If it does, I won't hesitate to just replace it with a Preditor from Harbor Freight like everyone else is doing.
Big deal, if the surrounding chassis and engine are decent you pull the head, remove the intake valve and grind away the correct clearance in the valve stem. Lapp both valves, install a new head gasket and away you go.
It's not worth the effort. This snowblower is worth $50 in perfectly working shape. The customer declined the repair and I scrapped it.
If this was an Ariens or other premium brand it might be worth it. But these machines are worthless garbage.
I would have sworn this was the issue with mine. It acts and sounds exactly the same but teverythibg check out good with the valves as far as I can tell
I always found that it’s almost always the engines with non adjustable carburetors that have this issue because they run way to lean due to epa regulations which makes them run hot and causes premature wear. I always try to use the aftermarket adjustable carburetors if possible so I can set them to run a bit richer. They unfortunately became disposable engines in the final years of production most ran poorly when new even
I suspect this too, and almost added it to the video. But I don't have solid proof of that, so I didn't.
I think the biggest thing was the engines were just terrible quality. This engine is very low hours as I said in the video, maybe used two or three seasons at most, and it's already developed this problem.
I have two snowblowers that have Tecumseh engines which use similar adjustable carburetors and after much use this winter I have read the plugs and they seem to be running with the correct fuel/air mixture. However I suspect that one and possibly both have valve leakage issues as they don't burn oil but the compression on the older one is about 65 pounds with no compression release. The other is better (about 80) with BCR compression release. I will run a leak down test as soon as I can to see what is going on and whether it is worth the effort to fix them. I don't want to deal with getting a new machine the new ones are too poorly built and the engines are all made in China.
@@phil463 I did the leakdown test a few months ago and both were very good which surprised me as the older one is 40 years old and wasn't well cared for. The newer one gave me really good compression when I used the electric starter to crank it over as opposed to the recoil starter. The older one has recoil start only. Like any other gasoline or diesel engine the most important thing is to change the oil frequently enough and most engines will last a long time without major issues.
I have to call bunk on this one. Sounds like an idle circuit blockage to me. Especially in a seasonal use machine (last years gas?) with a fixed jet carburetor. A Honda will run the same way with a restricted idle (low speed) circuit. I would figure with a leaking intake valve, your backfire would be coming from the carburetor, not the muffler. A simple leak down test would be in order to confirm your diagnosis. I'm partial to no brand, but Tecumseh engines will run just as good as any other in the proper state of tune. That engine is worth more than the junk snowblower its mounted on.
If you look around on TH-cam and elsewhere, you will find that this is actually an unfortunately common problem with this specific engine.
The exhaust valves also often fail, which causes the engine to run similarly, but the muffler glows red from the hot combustion gasses escaping through the valve.
The backfiring shown in this video was coming through the carburetor, but the camera's microphone didn't really pick it up as well as I had hoped.
Carburetor is set to lean. Readjust for richer mixture and red hot muffler will go away
as well as poor idle.
Are you sure about that valve problem..... sounds like the flywheel key has sheared off and the timing is off.... just sayin
Yes absolutely. I have seen this problem dozens of times. It is also basically impossible to sheer a flywheel key on a snowblower engine, since the impeller is belt drive. And the belt will slip before the flywheel key breaks.
tend to agree. Won't bother trying to repair mine. bought it used 8 years ago and it has gotten progressively worse.
your machine is surging, this isnt a valve issue, all you had to do is remove air idle set screw and clean it
God damn
Got a 5 horse doing this, time for a motor swap most likely
Its main cause is poor maintenance. Change oil use good gas. Most people that complain about small engines aren't very good at maintenance these are the same type of people that can only get 90,000 miles out of an import car. I'm the guy that collects all these "bad motors" clean them up and put my paycheck in my investment portfolio. Got neighbors old mower, blower,, snow thrower, weed wacked the other neighbors old Toyota they are starting to realize to ask if I can help fix theirs instead of dropping off in my driveway for me to use.
While I agree with this entire comment. This particular engine's problem is the result of a manufacturing defect. And isn't worth repairing.
@@Rustbelt_Research I'm not saying its not possible, I was speaking from my experiences I guess. But all the problems I come across I dont find myself fixing to many Tecumseh engines. Got one in my early 80's generator runs like new it never let me down since I pulled it out of a dumpster 16 years ago. I find myself doing Briggs alot and the import knock off everyone uses these days. My old man swears it's the ethanol it ruins everything he drives far to get ethanol free but his old stuff always work. I guess there are alot of variables to have to consider
@@Rustbelt_Research yeah I have an MTD snowblower with a 5.5 hp tecumseh engine and I think the valves are bad. I get blow by and it fouls up the spark plug
Just replace it with a Harbor Freight Predator 212 motor . Better quality motor for less cash .
This is the solution I usually tell people to go for. These Tecumseh engines are junk. It's never worth fixing them.
This guy doesn't know what he's talking about Tecumseh Power didn't go bankrupt they sold out to Platinum Equity, LLC in 2007 who continued to do business as Tecumseh power. In 2009 the corporation is sold to Certified Parts Corporation (CPC) who joined forces with Liquid Combustion technology (LCT) in 2010 they reintroduced the Snow King line of snow thrower engines and other engines formerly manufactured and sold by Tecumseh Power. ⁰The engines are exclusively represented by LCT, and sold under the Snow King, Lauson, and LCT brands and serviced exclusively by CPC and the existing Tecumseh Power dealer/distributor network. The engines are exclusively represented by LCT, and sold under the Snow King, Lauson, and LCT brands and serviced exclusively by CPC and the existing Tecumseh Power dealer/distributor network. Briggs & Stratton are the ones that went bankrupt last year, now all their motors are made in China (Chinese pieces of crap) of course what most people don't know they've been making there snowblower engines especially 900 series engines in China for a long time.
In short, Tecumseh engines and parts are currently manufactured by LCT, CPC and Lauson Engines.
Yes a ree that scraps things that are still well worth saving. Also from the vid and comments it seems he has a big ego like his time is worth a million $ cause he can fix some of them sometimes.
Exactly I finally came across one that had a bad valve out of about 100 snow blowers that have sold in the last couple of years. The guy I got it from gave me three snow blowers he beat dog piss out of all of them and didn't change the oil. The only reason I got one with a bad valve is because of ethanol fuel f'd the carburetor up and he was running it lean as hell. I change the oil twice a season in my personal snowblower always add 20% Lucas oil stabilizer, only use real gasoline no hybrid "acid gas" I beat the hell out of mine it's way over clocked on the max rpm.( I Live on a bench realistically I need a 10 or 11 hp for the heavy snow)It's a Toro 824 power shift it was over 30 years old and abused when I got it. Runs like a dream starts on the first Pull every season funny thing is the one I have is currently and was before I got it beaten and Ridden like a red headed step child and it has no valve issue. He probably has a bad head gasket from when he pulled the pull starter rope at a 90* angle and broke it. No worries he's the handy type fiqured he would try it out to see if he fixed the rope correctly before he put all the head bolts back in the blower housing and kaboom. I've seen that quite a few occasions believe it or not. What do you do.....