446 Engine
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Eugen
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Timj
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Re: 446 Engine
Wow, you could almost hear the collective sound of gears turning to figure this out. 
Now let's get this 446 back to work.
Now let's get this 446 back to work.
no more mow it's time to blow 
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DavidBarkey
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Re: 446 Engine
Doh , Ya , the nice thing about BF-MS is it is the same small block and I am told can be bored to standard B43M
Dave
Dave
Mad Tractor Builder
Mad Tractor Builder
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Vivala446
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Re: 446 Engine
Well, I spoke too soon. When I got home I pulled one of the heads and the “new” pistons are stamped STD as well. Even if the one on the other side was a different size at least one cylinder should fire I’d think. Could it be the rings are wore out?
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Eugen
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Vivala446
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Re: 446 Engine
That was based on the receipt I had. When I pulled the head off I saw the STD stamped very faintly. The one that I know is STD didn’t have as much slop in it as the other side. And the surface was kind of rough. And I noticed some oil that looked like it had been squeezed up the cylinder to the top in the course of turning the engine. Could it be the rings are just wore completely out? Or could it be that there are size variations within the STD?
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Eugen
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Re: 446 Engine
I am greatly confused now. So you bought two BF-MS pistons. Did you put them both in or only one?
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Vivala446
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Re: 446 Engine
Lol. Yeah, I have weaved a twisted tale.
When bought the tractor it was running on one cylinder— the passenger side. The drivers side did was in pieces. I bought what we’re described as BF-MS pistons to replace them. I replaced both pistons and rods with the supposed BF-MS ones. I didn’t mess with anything on the engine other than the pistons and rods— didn’t mess with the valves, etc. Once I got it all back together the starter will turn the engine all day long but it will not fire. Plugs are sparking. Valves work, etc.
As I said the piston that replaced the original damaged one has a lot of slop in it.
That’s where I’m at now.
When bought the tractor it was running on one cylinder— the passenger side. The drivers side did was in pieces. I bought what we’re described as BF-MS pistons to replace them. I replaced both pistons and rods with the supposed BF-MS ones. I didn’t mess with anything on the engine other than the pistons and rods— didn’t mess with the valves, etc. Once I got it all back together the starter will turn the engine all day long but it will not fire. Plugs are sparking. Valves work, etc.
As I said the piston that replaced the original damaged one has a lot of slop in it.
That’s where I’m at now.