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I have been "gifted" an old Briggs and Stratton engine in a Craftsman walk behind string trimmer. It is an L Head motor. It was run w/o oil and fried the engine (oil was ugly), and now it won't start.

I'm about to tear it apart to rebuild it but was looking for advice on what is likely the culprit and what I should be replacing. I'm assuming the tappets got worn down so the valves aren't opening and possibly the camshaft is worn out as well. Should I replace the valves as well? Anything else to consider?

Also, I can't find the engine model number anywhere..It is not where the B&S site says to locate them. It is an old engine (probably 20 years old) but hardly run, so almost like new.. except for the fried part.

Any thoughts and ideas are greatly appreciated.

-g
 

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Run without oil, i'm going to expect some aluminum transfer on the rod journal of the crank and bearing journal... muriatic acid will take it right off.
 

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Run without oil, i'm going to expect some aluminum transfer on the rod journal of the crank and bearing journal... muriatic acid will take it right off.
Yu might have to posy good photos of rod and crankpin look for the rod to be worn loose if not it may be revivable check the crankpin for the transfer (galling), not galled ?not loose you may as well reuse that combo . Get a case gasket or clean the two block halves where gasket fits with acetone then use grey ultimate rtv to reasemble when you have done any work or replacement of the piston or rings .you may benefit from putting 3/4 a pint of havilin car oil in it 5w 20 and attemp to run the motor with nessesarry caburetor diaphram replacement this is the direction i recomend valves might need valve lash set. If it has points they can be sanded with 400 black sandpaper use a new peice and wash contacts off with clean cotton and say spot of acetone.start motor after setting valve lash clean and tighten spart plug or replace yu should notice some improvement someone will say dont use car oil i use it and no my cam isnt worn out
 
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