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Briggs 446777 Engine, Low Oil Shut Off


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  #1  
Old 09-27-2017, 02:40:53 PM
uglyblue66 uglyblue66 is offline
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Default Briggs 446777 Engine, Low Oil Shut Off

Well I guess today it was my turn in the barrel of shi- happens .
I bought a Everride zero turn mower in april of 2006 and it has 264 hours on it. 25 hp briggs 2 cylinder engine.
I bought a good mower and have kept it's oil changed and so forth because I wanted it to last a long time. For 5500 bucks it should.
But I was mowing today and all was well until I turned left kinda sharp and started up a little grade along the roadside that I keep mowed in front of the house. There was a sudden noise,a grinding sound like gears grinding,then the engine started missing and rpms reduced. I idled it into the shop and I thought it had swallowed a pushrod like my neighbors engine did like this. I pulled 1 spark plug wire and it cut off, pulled the other and it stayed running. But there is a noise in there and it don't turn over right. It was a little low on oil and it is black as a cast iron pot and I know I changed it not 2 months ago ,less than 5 hours of operation.
I am trying to figure out what went wrong. It would seem if it was oil related the pressure switch would have cut the engine off before anything happened would it not?
In short, I will have to tear the engine down and see what happened but anything I can learn before hand will be handy info.
This really bugs me as I had plenty enough to try to patch up around here with out my zero turn machine flying to hell.
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Old 09-27-2017, 03:06:35 PM
Tracy T Tracy T is offline
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Default Re: Briggs 446777 engine,low oil shut off. :(

I am not familiar with your specific engine but I will give you a couple pointers, neighbours Kohler took a crap similar to what you described it was a twin cam engine and one of the camshaft's broke. Briggs use to have a screwy counterbalance that would come apart. Post up some pictures of the carnage when you can. Inquiring minds want to know!
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Old 09-27-2017, 03:15:00 PM
Vanman Vanman is offline
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Default Re: Briggs 446777 engine,low oil shut off. :(

Black oil that isn't old makes me think that it got HOT. Then the oil breaks down, loosing it's lubricating ability and... Bad noises and bad things.

Are all of the cooling air passages clear of debris?
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Old 09-27-2017, 05:26:09 PM
Tracy T Tracy T is offline
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Default Re: Briggs 446777 engine,low oil shut off. :(

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Originally Posted by Vanman View Post
Black oil that isn't old makes me think that it got HOT. Then the oil breaks down, loosing it's lubricating ability and... Bad noises and bad things.

Are all of the cooling air passages clear of debris?
X2! Another neighbour with a Briggs had what he thought was serious problems, damn mice packed it full!
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Old 09-27-2017, 05:57:22 PM
uglyblue66 uglyblue66 is offline
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Default Re: Briggs 446777 Engine, Low Oil Shut Off

I had the shroud off in july because I cleaned the carb.It had been sputtering and i thought it may have water in it. so I checked the cooling areas and dust,but no accumulations that should interfere with cooling.
I have the shroud off now because I thought perhaps the plastic fan blades had busted and were tossing around in the shroud. I found that on a John Deere back in May. Rust had pushed the plastic up from the flywheel enough it caused impact.
But no problem of that type here.
I use Havoline 10-30 and Microgard oil filter made by Wix. So I didn't use wally world special.

I find alot of mice compactions in machines I work on for other folks but thankfully this 1 is not 1 of them.
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Old 09-27-2017, 08:10:41 PM
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Brian Lynch Brian Lynch is offline
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Default Re: Briggs 446777 Engine, Low Oil Shut Off

Check the valve guides on the affected cylinder. They will loosen up when the engine gets too hot and will migrate. If you find bent pushrods it went out towards the rockers. A valve stuck open or not seating properly means it went towards the valve head.
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Old 09-30-2017, 08:13:26 PM
uglyblue66 uglyblue66 is offline
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Default Re: Briggs 446777 Engine, Low Oil Shut Off

Well,it destroyed a connecting rod!
Here is a pic of the engine as it looked when I removed the shroud.
Also is a pic of the rod!
The piston is also damaged.
BUT the good news is, the aluminum flaked right off the crankshaft and it polished up nice,no damage. No damage to gears,cylinder,top or bottom bushings,nothing. Just the rod,and boy did it come apart.
There was a good bit of oil in the engine.And when I removed the oil pressure switch oil squirted out of the hole as if it had pressure on the switch and it has not been run since Wednesday.?
Any how,gota started doing a parts search and then get some funds in the ebay account monday to buy parts.
it coulda been worse.

I am going to get 2 new pistons,rods,rings,oil seals,gasket set. That should cover it.and of course give the cylinders a good honing.
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Old 10-01-2017, 03:30:40 AM
Tracy T Tracy T is offline
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Default Re: Briggs 446777 Engine, Low Oil Shut Off

Looks designed to fail after x number of hours. Glad you have enough left to work with though, most folks would junk it and buy another.
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Old 10-01-2017, 07:42:52 AM
sprkplug sprkplug is offline
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Default Re: Briggs 446777 Engine, Low Oil Shut Off

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Originally Posted by Tracy T View Post
Looks designed to fail after x number of hours. Glad you have enough left to work with though, most folks would junk it and buy another.
Would you mind pointing out from the photos just what you see that was " designed to fail???" That's a load of BS

Unless you're mowing grass in January, you need straight 30 in your Briggs. I won't say that is the reason the rod broke, but it's good practice nonetheless. Metal transfer to the crank, along with black deposits usually indicates lack of oil. Maybe it was too low, maybe the pump failed, maybe a combination of low oil and the slope proved fatal. Did you check the oil before you started mowing?

Also, the oil pressure switch might just turn a light on.....NOT shut the engine down.
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Old 10-01-2017, 08:22:38 AM
uglyblue66 uglyblue66 is offline
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Default Re: Briggs 446777 Engine, Low Oil Shut Off

Yea I did check the oil, where the E@#* it went? only other thing maby the machine was not level as it needed to be.


How could I tell if the oil pump failed?
There is no light on this machine. I have 1 with a light on a vangaurd but this 1 does not.

Very confusing on the oil. help me out here,
Book here from Everide says 10-30 10-40 all across the chart, 30 weight also from 40 to 100 Degrees ambient temp?
I do know this,I will be going back to Castrol for better heat protection.
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