12S912-0121-B1 issues

[fixitmyself]

CONFUSED: This motor is for my pressure washer. I just changed the timing gear, but now when i turn it over by hand notice one of the cam lobes is hitting the crankshaft. Marks are aligned. Thought maybe momentum wasn't enough for it to clear so i put it together but cant spin it a full pull of the rope before it just stops turning. Sorry for the poor description not sure how else to explain. Need some help here please!!!!!

 

[Scrubcadet10]

Post the part number of the part you bought.

 

[fixitmyself]

Briggs and Stratton # 797521 Genuine

 

[slomo]

If the parts are OEM Briggs and all aligned, can't see an interference issue. Obvious you have one or both skewed. Can the new gear go on upside down?

slomo

 

[ILENGINE]

@slomo From the part picture it looks like it will only fit one direction. I also agree that something isn't set correctly. Some of those Briggs camshafts have a mark that can be mistaken for a timing mark.

 

[StarTech]

If might if you take a picture of how are aligning the gears as we might see if there something you have missed.

 

[fixitmyself]

Hope these help

 

[fixitmyself]

the 2nd and 3rd photos is after turning crank by hand. maybe 1/4 to 1/2 turn. Was curious if the plastic lobes or gear have been known to rotate on the metal shaft. Couldnt move any of them by hand. Stab in the dark !

 

[ILENGINE]

There has been cases where the lobes rotate on the shaft, and in some cases the gear will also rotate throwing the timing off.

 

[fixitmyself]

only thing I can figure is lobe or gear rotated on shaft. Based on pictures would anyone agree? Or could it be something I'm missing?