Briggs Crankshaft swap

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horror_fan

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So I took my engine apart to replace the crankshaft. Problem is I'm not sure what crankshaft to get. Tried to call briggs but didn't get any answer.

Neither of the clutches I have work with my Briggs crankshaft. I need the kind thats like the predator crankshaft , the one has that key way and screw thing.

Does this crankshaft type have a name or maybe can someone give me a part number for the right crankshaft..

(I believe my motor is a briggs 3hp or 5hp , Ill have to look at the number. I can post it later and I can also post pics of my crankshaft and my clutches)
 

horror_fan

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Heres the numbers , if you can't read it says:

Model , Type , Code
131232 , 2036-01 , 79033007



Here the crankshaft , if you notice closer to the engine block theres a little hole at the end of the crankshaft , which the previous owner used to have the clutch screw into it.
It was really bad because it doesn't hold very well and sometimes the clutch will just fly off, hence the reason why I want together a new crankshaft + it as no hey way hole.




Heres the valves , do the look good? I don't really want to rebuild the motor

 

Clifton

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You can't really tell much from the top side of a valve, it has a bit of carbon on it which is to be expected, you have to open the valve and check that it has a clean mating surface with the valve seat and that neither the valve or the seat have any pitting.

You can probably pick up another one of those old 5 horse engines for the price ordering a crank will cost you.
 

horror_fan

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Where do you live Horror?

why ?

---------- Post added at 11:05 AM ---------- Previous post was at 11:03 AM ----------

You can't really tell much from the top side of a valve, it has a bit of carbon on it which is to be expected, you have to open the valve and check that it has a clean mating surface with the valve seat and that neither the valve or the seat have any pitting.

You can probably pick up another one of those old 5 horse engines for the price ordering a crank will cost you.

I found some on craigslist haven't got any positive responses yet.

I also called briggs and then gave me a part number ,forgot to ask for the price though.

I think youre right, I will need to get another parts engine for the crank because there maybe other pieces I need to swap over to fit the crankshaft.

as for the valves, I guess ill inspect the more thoroughly when I pull out the camshaft
and by mating surface you just mean the underneath of the circle right?
 

Clifton

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as for the valves, I guess ill inspect the more thoroughly when I pull out the camshaft
and by mating surface you just mean the underneath of the circle right?

Correct.


That is a picture of the valve 'seat' (under the valve).. that is where the valve makes contact with the block or head and makes a seal. In that picture it has some dark spots which is pitting, caused from rust or whatever, it allows air to leak past the valve so that the engine won't have very good compression.

If there is a consistent ring around the valve and the seat without any 'dark spots', then the valves are probably sealing good.
 
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