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Discussion Starter #1
Are all f series powerheads inter-changeable- if so how about cranks - seals pistons. Can you take a 93 f series head and put it on a 87 f series crank. I am just trying to get a feel for how i can coble together a couple junkers to make a working mower. Thanks.
 

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The answer is yes, for the most part. Capstan SP cranks are different because of the gear machined into the crank.

That said, the bore and stroke was consistent throughtout the F's production run, so cranks, rods, pistons, cylinders etc. will interchange. The V series guts have many parts common with the F as well.

Charlie
 

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Go for it....if you run into a snag give me a holler. I've got loads of "F" series parts and internals. I need to rid myself of some.
 

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I think my F on my 8401 might need some love over the next winter. I noticed there is some slop in the bottom end.

1. How do you know when you need a rebuild?

2. What will I need for seals, bearings, bushings?

3. What is a good source for getting these parts?

Eric
 

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Discussion Starter #7
Just check compression as long as you are above 90 (i think manual says 80) you will be fine. Seals will go usually before you lose compression unless the mower has sat and rusted inside causing excess wear when unlocking piston and rings. The seals will start to leak excessively and you will notice a lot of oil around the base of your motor and deck. Some slop seems to be normal. Never had to replace a bearing yet. Parts are about the same everywhere as far as I can tell. $2-3 for seals and $10 for rings which is 99 percent of rebuilds.
 

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Just check compression as long as you are above 90 (i think manual says 80) you will be fine. Seals will go usually before you lose compression unless the mower has sat and rusted inside causing excess wear when unlocking piston and rings. The seals will start to leak excessively and you will notice a lot of oil around the base of your motor and deck. Some slop seems to be normal. Never had to replace a bearing yet. Parts are about the same everywhere as far as I can tell. $2-3 for seals and $10 for rings which is 99 percent of rebuilds.
And that's exactly why I wonder why there are so many inexpensive F engine LB's out there. As long as they have spark they usually only need a plug and a carb clean. That's the beauty of these mowers; as long as they've been fed a constant diet of the correct mix fuel they will practically last forever with little maintenance. I'm starting to think that since most people don't have much free time or are lazy and they don't have to do anything with their LB too often, once something happens they're afraid to put any money into it and dump it cheap or just throw it out!
Shhhh, don't tell anyone that they're so easy to work on! :trink39:
 
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