YT660 - Engine oil bubbling out of filler neck - Page 3 - Snowblower Forum : Snow Blower Forums
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post #21 of 32 Old 12-19-2018, 03:16 PM
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I think the only thing you can get wrong with that filling/level plug method is to forget to put new oil in after draining the old oil. Had a neighbour who did that one year, drained the oil in spring, didn't refill it right away. I guess he forgot to check it before start up the following winter and guess what happened...

I have a Honda engine on my Toro lawn mower with the same fill/level system and your can' mess that up, unless you end up pouring in too much which promptly drains out all over the mower deck and makes a mess, but the correct amount is still in the crankcase.

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post #22 of 32 Old 12-20-2018, 09:24 AM
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Thanks Coby
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post #23 of 32 Old 12-21-2018, 04:26 AM Thread Starter
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Daylight finally came and brought some snow. Oil change is now done (non-synthetic, thanks Mr Gibbs) and I closed the fuel tap and let it die out itself (thanks SkutFlut )


I'll monitor the situation and update results/solutions in case it helps someone else out.
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post #24 of 32 Old 12-21-2018, 05:40 AM
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I changed the engine oil towards the end of last season, topping it up to bring it level with the filler neck hole (as per instructions).
In early autumn I drove the machine outside and gave it a general lube, brush-up and treated a couple of rust patches. When I unscrewed the filler cap, I noticed some engine oil overflow out of the filler neck. I thought this must be because the oil had expanded a bit during the summer and didn't think much about it.
The machine wasn't used until today. It was around -5C (23F) in the store. The blower was parked on a level surface and I checked the oil level before start-up. Again oil glugged out of the filler hole.
Any ideas?

Simple explanation. As the crankshaft turns various parts of rod, crank and slinger will contact oil in sump displacing it.
As evidence, remove oil fill cap and very slowly rotate crankshaft one turn and watch the oil level rise and fall.
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post #25 of 32 Old 12-21-2018, 07:39 AM Thread Starter
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Thanks DriverRider for the reply. I understand the principle but I fear there is another cause. I've seen an increased oil level on three different occasions in the last 3 months, but the oil level was steady before the 15-20 times I used it last season.
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post #26 of 32 Old 12-21-2018, 06:33 PM
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Sounds like you may be adding gasoline to your crankcase from a leaky carb. needle valve.
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post #27 of 32 Old 12-21-2018, 07:02 PM
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Sounds like you may be adding gasoline to your crankcase from a leaky carb. needle valve.
Would you explain how that can happen? I would think a leaking carburetor would leak external to the engine proper
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post #28 of 32 Old 12-21-2018, 08:06 PM
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Would you explain how that can happen? I would think a leaking carburetor would leak external to the engine proper

I have had a spec of dirt between the needle valve and the n.v. seat, and the gas will fill up and then enter into the crankcase thru the intake manifold. This was on a B&S 14 HP Intek engine - not sure what exact carburetor.



Take a sample of your oil and see if it has any gasoline smell to it.
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post #29 of 32 Old 12-21-2018, 08:07 PM
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No need to worry, Honda GX motors are the same way, fill them to the brim as per the owners manual, check it later and it overflows. The first time it happened I had checked the oil right after running it for a while, one thing I did notice was that the oil had a lot of bubbles in it. The oil gets agitated due to the elbow/arm stuck to the piston rod causing the bubbles; also, when you checked the oil the protruding arm may be in the down position dipping in the level oil causing it to come up a bit.
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post #30 of 32 Old 12-22-2018, 06:26 AM
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Quote:
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Would you explain how that can happen? I would think a leaking carburetor would leak external to the engine proper
just had the same issue on a troy bilt, leaked internally into the manifold into the bore via the intake valve,past the rings into the crankcase, the needle was gone,
new carbs seem to be unlike the olders for epa/carb gas vapor rules,
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