OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines B&S 3.5 hp Engine woes

I have had to pull apart my Briggs and Stratton engine Model #92908, type:5389, code/; 89042104 as the oil seals needed replacing. I seem to be able to get the thing bact together but I am unsure of how to mate the crank and cam to assure correct timing. I don't have a manual or anything so am unsure also of the airgap settings etc. If anyone can help, I would be eternally grateful.

Gooz,
Ok this is what you need to do:

1. The timing marks are located on both the crankshaft gear and the cam gear. It is like a centre punch mark on both gears just line the dot's up and the timing is correct.

2. The air gap is easy just use a normal business card between the coil legs and the magnet on the flywheel.

This should help you with you problems.

Regards,

Bruce

Thanks very much for the prompt and correct response. I assumed that there would be alignment marks but have not been able to remove the lower boss from the crankshaft to remove the crank from the housing. I need to do this to replace the oil seal. In the process I have stuffed the thread on the crank so I will have to either seek a replacement crank or retap the thread to a larger diameter. Do you know if obtaining a crankshaft is a vaible option before I attack the boss with a grinder. I've tried belting the shaft, using wheel pullers, oxy heat, soaking in penetrene overnight but I think it's pretty well fused onto the end. Can you help on this one?

Gooz,

1. Take motor off frame and if you can put the boss on an anvil or somthing simaliar. Then hit it with a hammer and turn it about a quater of a turn after hitting it and repeat till it becomes loose .

How did you manage to damage the shaft?

Regards,

Bruce

Thanks Bruce, I tried that and that's how I stuffed the thread. Its pretty well fused on. I put the screw in and belted it with a hammer. I've managed to locate a engine of the same number and code, only the crank is a little longer, it was off a Masport. I'll have it turned down and externally threaded and use a nyloc nut on the thread like the Victa 2-strokes. The crank bearing surface is a little smaller and the piston off the replacemant crank is oversized so I assume that it has been ground since new. With a bit of luck, I'll be able to use my old piston on the replacement conrod. Does this sound viable?