Battery Hub 8M0187358 MerCruiser 3.0L TKS Alpha Repower Complete Marine Engine 135HP

The 8M0187358 is a complete 3.0L TKS (Turn Key Start) Alpha sterndrive engine designed specifically for repower applications in runabout and pontoon boats. This fully dressed marine engine delivers 135 horsepower at 4400-4800 RPM and features a 181 cubic inch (3.0L) inline 4-cylinder configuration with a 9.3:1 compression ratio.

Engine Specifications:

• Power: 135 HP (99.3 kW) at 4400-4800 RPM
• Displacement: 181 cubic inches (3.0L)
• Bore & Stroke: 4.00" x 3.60" (101mm x 91mm)
• Fuel System: 2-barrel carburetor with Turn Key Start and mechanical fuel pump
• Ignition: EST Analog with distributor
• Fuel Requirement: 87 octane gasoline

Key Features:

• Complete drop-in ready engine - fully dressed and ready to install
• Front engine mount configuration (non-power steering version)
• Raw water cooling system with thermostat control
• Single-piece iron intake-exhaust manifold for reliability
• 65 amp/917 watt alternator
• Remote oil filter included
• EZ Drain water system with quick-disconnect drain hoses and flush feature
• Engine Guardian System monitors low oil pressure, high coolant temperature, and low drive lube
• Audio warning horn for overheat, low oil pressure, and low drive lube alerts

Construction Details:

• 100% new Quicksilver cast iron block with large fillet radii crankshaft
• Tri-metal bearings for durability
• Cast iron cylinder heads with hardened seats and screw-in studs
• Black-X valves and 1.5:1 rocker arms
• 140°F thermostat and NGK spark plugs
• V-belt accessory drive system
• 14-pin harness (adapter required for pre-2006 applications)

Compatibility:

• Replaces 2.5L and 3.0L sterndrive engines from 1963-2015
• Designed for Alpha sterndrive applications
• Ships with MerCruiser Alpha coupler
• Provision for dealer installation of side engine mounts
• Pilot bore machined into crankshaft to accept Volvo couplers

This engine is ideal for repowering classic sterndrive runabouts and pontoon boats using the traditional front engine mount system. Built with proven GM-based architecture and 100% new Quicksilver components, it provides reliable performance and easy maintenance. The Turn Key Start carburetor system ensures dependable starting, while the integrated Engine Guardian monitoring system protects your investment.