12AKP38S799 MTD Lawn Mower

This was an OHV motor so in order to get to the head, you must remove the valve cover and remove the push rods. Remove all four head bolts in an even star pattern. Remove the old gasket and scrape all remaining gasket gunk. Put new gasket on and tighten head back on with an even star pattern. Slide push rods back in and adjust valves to . ... Read more 004 of an inch and put valve cover back on and start it up!

Remove the top cover and pull cord assembly. Remove the muffler cover. Lift off the gas tank and disconnect from the air filter box. Remove the air filter box and carb from the head cover as a single unit. Remove the head cover. You can leave the valve cover in place. Remove old gasket material. Clean surfaces. Replace gasket. Reassemble ... Read more . *if the valve stems come loose from their seats or rockers, remove the valve cover and reseat. Reassembly is the opposite of disassembly. Happy mowing.

I removed the rear wheels, then I removed the blade, then the motor, then the front wheel assembly. The bolts holding the front wheel assembly were rusted and rounded trying to remove them, so I cut them out with a grinder. Afterwards I removed the remainder of the screw with a pair of pliers. I also removed the Water jet cleanout nozz ... Read more le, found it was cracked, ordered the part from PartSelect, along with the screws needed to attach the front wheel assembly. I cleaned the remaining parts and re installed them onto the new deck. First, I installed the front wheel assembly, then the motor, then sat the mower upright, installed the blade, then took the rear wheel assembly and aligned it and fastened it to the deck. Last piece was the water nozzle. I placed it in the recess for it, and fastened it with the bolt. Then I tested the mower, and it worked without issue. Afterwards I used the new clean out port to rinse the underside of the deck, and it worked well.