Husqvarna YTH21K46 Mower Blowing Oil Out Above The Carburetor - Tractors & Mowers - DIY Chatroom Home Improvement Forum
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Old 07-01-2019, 05:16 PM   #1
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Husqvarna YTH21K46 Mower Blowing Oil Out Above The Carburetor


Well Yuri warned me that troubles travel in threes. My third problem after a tanker truck totaled our car, several large limbs blew out of the top of a tree across the street and landed on my Toyota 4X4 and messed it up, now the blame lawn mower is blowing oil out just above the carburetor, have had the mower about three months or so. I just give up.

Any suggestions? About the only things I can think of is a blown head gasket, or over filled oil.
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Old 07-01-2019, 06:42 PM   #2
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Re: Husqvarna YTH21K46 blowing out above the carburetor


Just looked at mine. There is a "crankcase vent" looking thing right above carb. Has a rubber tube which I guess is like pcv.



I'd disconnect mine and crank it just to see but I'm in process of extracting bird nest and parts from engine. They build behind air filter. And they really stink when sucked into engine. Last year was mice. They really stink.


good luck with it
bg


Also as a heads up the trannys can be serviced. It is a pia but they want first born male child for a new one.
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Old 07-01-2019, 06:47 PM   #3
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Re: Husqvarna YTH21K46 blowing out above the carburetor


The other option is tell ins co, oh I forgot, the limb also landed on my mower.
Actually I think stuff like that is bad karma. Like hooking folks tools.



bg
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Old 07-01-2019, 10:34 PM   #4
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Re: Husqvarna YTH21K46 blowing out above the carburetor


You are right, that is where the vent is on mine also and that is where to oil was blowing from. I am pretty sure I have found the problem already. I drained the oil this evening and it wasn't just oil, it was gas also.

When I parked the mower last time the gas tank drained, I just didn't know it had drained into the engine. I pulled the carb and that thing was so gunked up with really thick sticky yellow crap that carb cleaner wouldn't even clear it out. I tore the carb down and cleaned it up really well and blew all the cleaner out of it also.

The fellow who owned the mower before me must have used ethanol gas, I never use ethanol in a small engine. I need to get a carb kit because the seals and stuff are trashed.

I drained over 1/2 gallon of crap out if the engine so there lies the problem, I hope. All that gunk had gummed the carb up and the float and needle seat couldn't work so it drained the gas tank into the engine. When I fired it up all it could do is blow it out the vent. I sure am hoping that is what the problem was. When I get it back together I will let you know.

By the way, what is the solenoid on the bottom of the carb for?
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Last edited by BigJim; 07-02-2019 at 07:44 AM. Reason: Added
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Old 07-01-2019, 11:25 PM   #5
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Re: Husqvarna YTH21K46 blowing out above the carburetor


Also check the fuel solenoid before carb. Mine went south and I'd get a bunch of gas in oil. OE was $80 for one. Replaced w/generic normally closed aftermarket for $12. When it went south I replaced it with a manual fuel valve.
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Old 07-01-2019, 11:38 PM   #6
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Re: Husqvarna YTH21K46 blowing out above the carburetor


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Originally Posted by yardmullet View Post
Also check the fuel solenoid before carb. Mine went south and I'd get a bunch of gas in oil. OE was $80 for one. Replaced w/generic normally closed aftermarket for $12. When it went south I replaced it with a manual fuel valve.
bg
Did you just put a shut off valve in the gas line?
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Old 07-02-2019, 06:37 AM   #7
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Re: Husqvarna YTH21K46 blowing out above the carburetor


yes. It is reachable w/hood down.
The orig ones are close to the tank and have 12v wire.


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Old 07-02-2019, 07:36 AM   #8
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Re: Husqvarna YTH21K46 blowing out above the carburetor


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yes. It is reachable w/hood down.
The orig ones are close to the tank and have 12v wire.


bg
Thank you so much, I really do appreciate you explaining that to me. I will check to see if that shut off valve is working today. Now that I know that is what the fuel solenoid does, I am sure that is what the problem was.

When I looked inside of the fuel tank, there was a yellowish brown slime on the bottom of the tank. I flushed 98% of it out of the tank but couldn't get the rest. I will check to see if it is all gone now. That yellowish brown sludge was thick as cold honey. It wouldn't wash off the bowl, I had to wipe that out. It did wash out of the rest of the carb with a lot of carb/brake cleaner though.

If that valve isn't working and I can't unstick it, I will put a manual shutoff in the gas line.

Again, thank you so much.
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Old 07-02-2019, 07:45 AM   #9
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Re: Husqvarna YTH21K46 blowing out above the carburetor


Like this: ok not this

Last edited by yardmullet; 07-02-2019 at 07:50 AM. Reason: pic didn't upload
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Old 07-02-2019, 07:48 AM   #10
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Re: Husqvarna YTH21K46 Mower Blowing Oil Out Above The Carburetor


Or this
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Husqvarna YTH21K46  Mower Blowing Oil Out Above The Carburetor-img_20190702_073342639.jpg  
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Old 07-02-2019, 07:56 AM   #11
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Re: Husqvarna YTH21K46 Mower Blowing Oil Out Above The Carburetor


I ddon't much trust the solenoids. Guy at Husky place said they replace many. I got ~4yrs out of aftermarket one. The manual one has been on 5yrs. It is stiff but works.


Yellow sludge..hmmm. Did you put premix in it. How old was the gas?


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Old 07-02-2019, 03:34 PM   #12
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Re: Husqvarna YTH21K46 Mower Blowing Oil Out Above The Carburetor


I just got back from the parts supply, I bought a new large "O" ring for the bowl and I bought that same shut off valve you have in the photo. I don't want to chance gas in the oil again either.

I bought this mower used, from a fellow who wanted a larger mower. I have no idea what he put in the fuel, I will guess he ran ethanol in it. The oil looked really clean when I bought it, but didn't look in the gas tank. This is only the fourth time I have used the mower... I think.
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Old 07-02-2019, 04:06 PM   #13
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Re: Husqvarna YTH21K46 Mower Blowing Oil Out Above The Carburetor


Maybe just water, additional crankcase volume causing blow by.
Change oil and filter, flush carb and tank.
Even after mine ate water, mice, bird eggs it finally cranked.
They are really kinda easy to work on. Its just parts cost. I'll check my parts box for stuff I had to fix.
The tranny at 4yrs was a big disappointment. Jack shafts from hay twine. Cables to throttle, blade engage thing, but thats expected. There was something else recently.


They aren't like Swede Husky bikes I had. My 390OR was still running UNDER WATER after I broke my pelvis and landed in a creek. Every time I raised my head above water I got shocked on my nose. I thought damn I lived thru that getoff now I'm gonna drown.


Post updates
Well off to watch FIFA

bad line billy

Last edited by yardmullet; 07-02-2019 at 04:16 PM.
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Old 07-02-2019, 07:49 PM   #14
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Re: Husqvarna YTH21K46 Mower Blowing Oil Out Above The Carburetor


Blame, I forgot to change the oil filter, I guess I will change oil again. I got it back together and put the inline shut off on, fired right up and ran like a top, problem solved. I really do appreciate it.
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Old 07-02-2019, 08:45 PM   #15
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Re: Husqvarna YTH21K46 Mower Blowing Oil Out Above The Carburetor


Maybe dump filter content into clear jar to see if has gradu* in it. Or just replace. They are cheap.
*Stuff in the bottom of cold drinks at sports events.


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