Lubricants, Sealants, Adhesives
Tube Ref No. Description Where Used Part No.
Loctite 565 PST Threads of oil gallery plugs and oil pressure sender Obtain Locally
66
Loctite 242 Threadlocker
Expansion cup plug (camshaft rear bearing hole)
Outside diameter of engine block core hole expansion plug
Camshaft thrust plate retainer bolt threads
Outside diameter of core expansion plug
Intake manifold bolt threads
92-809821
80
SAE Engine Oil 30W The seal to retainer mating surfaces, the seal lip Obtain Locally
128
Loctite 5900 Ultra Black
RTV Silicone Sealant
Each end of the lower intake manifold gaskets on the cylinder
head side
A wide bead of adhesive to the front and rear of the engine
block, extending the adhesive bead
Crankshaft front cover mating surface of the seal
92-809826
136
Lubriplate SPO 255
Main bearings and crankshaft bearing journals
Piston pin
Threads and mating faces of connecting rod cap and screw
Camshaft journals, camshaft, and camshaft lobes
Valve stem
Outside surface of valve stem bore and all surfaces of the valve
stem oil seal
Valve stem keepers
Camshaft lobes and valve lifters
Valve lifters
Outer surfaces and ends of valve pushrods
Rocker arm and rocker arm ball contact surfaces
Upper and lower bearing
Obtain Locally
137
Loctite 5512 Adhesive
Both right and left side joints of the rear seal retainer and joints of
the front cover
92-858006K02
139
Mercury 25W-40 Synthetic
Blend 4-Stroke Engine Oil
Cylinder walls
Connecting rod bearings, pistons, rings, and cylinder walls
Front cover crankshaft seal
Crankshaft position sensor O-ring seal
O-rings
Rubber sealing surface
92-8M0078629
142
Loctite 598 RTV Sealant
Keyway of the harmonic damper
Keyway
Obtain Locally
Special Tools
Piston Ring Expander
91‑24697
Expands piston rings for removal and installation.
General Specifications
Description
Specification
Bore 101.609 mm (4.00 in.)
Stroke 95.25 mm (3.75 in.)
Firing order 1–8–4–3–6–5–7–2
Compression ratio 9.4:1
Heads Cast iron
Engine Inspection and Assembly
Page 3B-2 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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