MZ54 Husqvarna - Instructions

Clean engine with a Gunk type product. Remove valve cover. Loosen bolts and remove old cylinder head. One bolt is located inside valve cover area. Remove old gasket and inspect and clean that surface. Attach new head with new gasket using existing bolts. Torque to 18'#s with a cross type pattern. Attach new rocker arms and push rods. Set valve clearance to .004 - .006. Attach valve cover with gasket. Check oil level. Start and let it warm up. Let cool remove cover then check valve clearance again. Replace cover.

dissembled ordered repair parts, piston ,upper case, rod, camshaft, seal kit, and motor maintenance CD
The camshaft first provided did not have the compression release device on it and the cam lobe position was all wrong for the model engine I had. .
Parts Select provided me with the proper cam Shaft. Removed engine from mower (Scag Freedom Z) 15 minutes, drained oil, flipped upside down removed bottom case, removed wrong cam shaft, reinstall new valve lifters, camshaft with decompression release on it matching dots on crankshaft. Used paint brush to coat all parts heavily with motor oil.
Do not put sealant on case gasket,(it might change crankshaft end play), retorqued bolt in alternating pattern, placed nylon pipe tape on drain plug threads, and reinstalled engine on mower. It started instantly and ran extremely smooth with no oil burn or vibration.

I am very happy with the support and quick mshipping Parts Select provided..

Remove Deck, Remove Blades, Remove guards and belt, use old belt to hold pully to remove pully (would be good to have pully wrench), Remove mandrel Assembly, Install new mandrel assemblies (had to tap the new mandrel assemblies. Should have been done by manufacturer.). Reinstall blades, guards, and belt. Put deck back on.

Removed pin and spring replaced old deflector with new deflector reinsert pin and spring

Mark the location of the spring so you know how it goes on. Snip off the push nut holding the deflector shield pin. Hammer the pin out. Insert the pin with the spring holding the new deflector shield. Use a socket to steady the push nut and hammer the pin into the push net until secure.

Once the blade was off, the blade adapter came off easily with a little help from WD40, and getting the new one on was simple with a few taps with a plastic hammer