863480 Mercruiser SCREW, (.375-16 x 1.125)

There are holes in the bores for the main bearings, between cylinders 1 and 2, 2 and 3, 4 and 5, 5 and 6 for piston cooler orifices. These holes must have either orifices (9) or plugs (8) installed.
If a turbocharger is installed on the engine, be sure to install orifices (9) and an engine oil cooler. If the engine has an engine oil cooler and no turbocharger, be sure to install orifices (9).(10) Distance to install dowels from top of block ... .38 .02 in.(9.7 0.5 mm)(11) Distance to install stud from face of block ... .62 .02 in.(15.7 0.5 mm)(12) Distance to install dowels from rear face of block ... .50 in.(12.7 mm)(13) Distance to install dowels from front face of block ... .88 .02 in.(22.4 0.5 mm)(With Spacer Plate)
(1) Thickness of spacer plate ... .3925 .0010 in.(9.970 0.025 mm) Thickness of spacer plate gasket ... .0082 .0010 in.(0.208 0.025 mm) For height of liner over top of spacer plate make reference to CYLINDER LINER PROJECTION.(2) Camshaft bearing bore (installed) ... 2.3150 .0020 in.(58.801 0.051 mm) Bore in block for camshaft bearings ... 2.5630 .0010 in.(65.100 0.025 mm)Depth to install camshaft bearings at both ends of block ... .06 .02 in.(1.5 0.5 mm) The camshaft bearing at the front of the block must be installed with oil holes in a horizontal position and joint at top within 15° from vertical.(3) Bore in block for main bearings (standard size) ... 3.8160 .0005 in.(96.926 0.013 mm) Bore in block for main bearings .020 in. (0.51 mm oversize) ... 3.8360 .0005 in.(97.434 0.013 mm)(4) Dimension from center of main bearing bore to top of cylinder block (new) ... 15.099 .006 in.(383.51 0.15 mm)(5) Dimension from center of main bearing bore to bottom of cylinder block (new) ... 6.063 .004 in.(154.00 0.10 mm)(6) Torque for bolts holding bearing caps for main bearings: a. Put engine oil on threads and washer face.b. Tighten all bolts to ... 30 3 lb. ft.(40 4 N m)c. Put a mark on each bolt and cap.d. Tighten all bolts from mark ... 90° Install bearing caps with the part number toward the front of the engine. Be sure that the mark (number) on the bearing cap next to the bolt hole is in agreement with the mark in the cylinder block.(7) Clearance between slot in block and bearing cap ... .0017 in.(0.043 mm)loose to ... .0013 in.(0.033 mm)tight Main bearing cap width ... 6.4998 .0008 in.(165.095 0.020 mm)Width of cylinder block for main bearing cap ... 6.5000 .0007 in.(165.100 0.018 mm)
There are holes in the bores for the main bearings, between cylinders 1 and 2, 2 and 3, 4 and 5, 5 and 6 for piston cooler orifices. These holes must have either orifices (9) or plugs (8) installed.
If a turbocharger is installed on the engine, be sure to install orifices (9) and an engine oil cooler. If the engine has an engine oil cooler and no turbocharger be sure to install orifices (9). (10) Distance to install dowels from top of block ... .780 .020 in.(19.8 0.5 mm)(11) Distance to install dowels below top of block ... .039 .02 in.(1.0 0.5 mm)(12) Distance to install dowels from top of block ... .78 .02 in.(19.8 0.5 mm)(13) Distance to install stud from face of block ... .62 .02 in.(15.7 0.5 mm)(14) Distance to install dowels from front face of block ... .88 .02 in.(22.4 0.5 mm)