M 40 4 i i yr 7 Rlemove oil cooler and discard seals Remove spark plugs and discard gaskets Remove blower pulley and blower Remove crankcase vent tube and discard O ring seal then remove crankcase cover and crankcase vent Discard gaskets 7 Invert engine then Remove muffler heat shield lower shrouds and exhaust ducts Remove left rear shroud then disconnect wire from cylinder head temperature unit and remove rigk t rear shroud and harness as an assembly Remove oil pan and discard gasket Remove exhaust manifolds and discard packings Remove front shroud and elbow assemblies one left shroud attaching bolt may be reached inside heater elbow fig 51 Remove rear mounting bracket and skid plate at engine rear housing Remove valve rocker arm covers and discard gaskets 8 Remove rocker arm nuts rocker arm balls rocker armis and push rods Place in a rack so they can be installed in their original location 9 Remove valve rocker arm studs then remove push rod guides and discard O ring seals 10 Pull push rod tubes from crankcase bores and remove and discard inner O ring seals from push rod tubes then remove push rod tubes from cylinder head and remove and discard outer O ring seals 11 Remove nuts from cylinder head studs 12 Remove cylinder head assemblies and discard gaskets NOI9 Cylinders will need a holding fixture Six 4 5 8 lengths and six 3 3 4 lengths of thinwall 1 2 O D tubing if crankshaft is turned with cylinder heads removed 13 Install one long and one short holding fixture over a long and a short stud for each cylinder and retain with cylinder head nuts fig 52 r r i v c I Fig 52 Cylinder Holding Fixture