QuestionI would just like to get the basic idea on how to build a lawn mower engine, would you assist me? The make is Brigg's and Stanton the year and model are at this time unknown.
AnswerDepending on the age and hours used, the engine block may need to be bored, bushings replaced and crank polished.
If the engine needs to be bored then you will have to replace the piston. If the cylinder is within specifications then just a set of rings.
Main parts needed:
Gasket Set
Rod(optional)
Piston/Rings(optional)
Oil Seals
Rings (Replace if using old piston)
Oil
Tools:
Basic socket set
Briggs flywheel clutch wrench, holder and puller
Torque Wrench
Seal Protectors or similar item
Disassembley is fairly straight forward. Just remove all the parts, clean, inspect for wear and check tolerances. Re-assembley requires you to torque the rod and head bolts. The valves will also have to be lapped and clearances set; this is probably the most difficult part of the rebuild. The valve stems must be filed or ground to set the clearance. The grind must be square and very accurate...were talking a thousandths of an inch. If the valve guides are wore they will also need replaceing. Too many special tools are needed for this...take it to a machine shop or a dealer. Most of the other screws are just hand tight. You will have to time the engine, no tools required, just line up the cam and crank dots.
I'm not sure what engine you have, but unless it is very special I'm not sure I would rebuild it. Machine shop labor is expensive and but cheaper than buying all the tools for one time use. I haven't rebuilt an engine since the late 80's because labor prices have increased and replacement engine prices have decreased. I haven't even rebuilt my own stuff...I just find other engines that run, use them until they quit then recycle them.
I'm not sure I answered your question exactly, so let me know if you need anything else.
Eric
