879678 Mercruiser GASKET-CYLINDER HEAD, FRONT

Flangeless Liners
(1) Outside diameter of cylinder liner ... 103.264 to 103.289 mm (4.0655 to 4.0665 in)(2) Inside diameter of cylinder liners ... 98.48 to 98.50 mm (3.877 to 3.878 in) Maximum diameter wear (when boring or new liners are needed) ... 0.20 mm (.008 in)Interference fit of liner in cylinder block ... 0.08 to 0.13 mm (.003 to .005 in)Length of cylinder liner ... 228.73 to 228.98 mm (9.005 to 9.015 in)Maximum cylinder liner can be bored (made larger than original size) ... 0.76 mm (.030 in) The flangeless cylinder liners are the only ones that can be bored. All other liners must be replaced when worn beyond specifications. The five ring pistons are the only ones offered in oversize.(3) Liner projection (height of liner above face of cylinder block) ... 0.71 to 0.94 mm (.028 to .037 in)(4) Diameter of bore in cylinder block for liner ... 103.162 to 103.188 mm (4.0615 to 4.0625 in)Flanged Liners
New cylinder blocks have been introduced on 4.236 and T4.236 engin s. They have a larger cylinder liner parent bore diameter and the outside diameter of the cylinder liner is also larger. The liners will no longer have a flame ring. Effective with this change, only flanged liners will be available. The change became effective at engine serial number LD or LJ----- U106654N and up. The engine serial number is located above the fuel injection pump on the block.(1) Outside diameter of cylinder linerEarlier engines with thin wall liners: Production liner ... 103.238 to 103.264 mm (4.0645 to 4.0655 in)Service Liner ... 103.188 to 103.213 mm (4.0625 to 4.0635 in)Current engines with thick wall liners: Production liner ... 104.254 to 104.280 mm (4.1045 to 4.1055 in)Service liner ... 104.204 to 104.229 mm (4.1025 to 4.1035 in)(2) Inside diameter of cylinder liner: Production liner ... 98.48 to 98.50 mm (3.877 to 3.878 in)Service liner ... 98.50 to 98.53 mm (3.878 to 3.879 in)Maximum diameter wear (when new liners are needed) ... 0.20 mm (.008 in)Transition fit of service liner in cylinder block ... 0.03 mm ( .001 in)Length of cylinder liner ... 227.10 to 227.43 mm (8.941 to 8.954 in)(3) Liner (flange) projection [do not measure projection from flange ring (if equipped)] ... 0.10 mm (.004 in) above to ... 0.10 mm (.004 in) below face of cylinder block. Flange thickness of cylinder liner ... 3.81 to 3.86 mm (.150 to .152 in)(4) Diameter of parent bore in cylinder block for liner: Earlier engines with thin wall liners ... 103.188 to 103.213 mm (4.0625 to 4.0635 in)Current engines with thick wall liners ... 104.204 to 104.229 mm (4.1025 to 4.1035 in)Depth of recess for cylinder liner flange ... 3.81 to 3.91 mm (.150 to .154 in)All Engine Blocks
(5) Diameter of bore in cylinder block for camshaft No. 1 front bearing [has only front bearing (6)] ... 55.563 to 55.593 mm (2.1875 to 2.1887 in) Diameter of bearing bore for camshaft ... 50.800 to 50.843 mm (2.0000 to 2.0017 in)Diameter of bore for No. 2 journal ... 50.55 to 50.592 mm (1.990 to 1.9918 in)Diameter of bore for No. 3 journal ... 50.04 to 50.084 mm (1.970 to 1.9718 in)Clearance of camshaft in bore:Front (No. 1) ... 0.064 to 0.114 mm (.0025 to .0045 in)No. 2, No. 3 ... 0.064 to 0.135 mm (.0025 to .0053 in)Camshaft end play ... 0.10 to 0.41 mm (.004 to .016 in)Maximum permissible end play (worn) ... 0.51 mm (.020 in)(7) Diameter of bores in cylinder block for main bearings ... 80.42 to 80.44 mm (3.166 to 3.167 in)(8) Torque for main bearing cap bolts ... 245 N m (180 lb ft) Total height of cylinder block between top and bottom faces (not shown) ... 441.12 to 441.33 mm (17.367 to 17.375 in)