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Marine Engines Repower – Bayliner Cierra 2655, 1991 model Mercruser MCM 5.0l LX
Dennis, Thanks for your inquiry and the opportunity at earning your business. Since Mercruiser made both Alpha and Bravo sterndrive models with that engine I would not be able to tell you without knowing which one your engine is setup for. Can you give me the original engine serial number? Or can you tell me if [...]

4.3L Marine Engine Longblock Performance Specification
Mike, Thanks for your inquiry and the opportunity at earning your business. The Hp rating for longblocks is determined by the fuel system that’s install back onto the engine. For example since GM only produced one marine version of the 4.3L during this timeframe Mercruiser used this same longblock on their 190 Hp 2 barrel carb [...]

Marine Engines – Replacement marine engine for my boat 5.7 mercruiser 1992 #0d763634
Marty, Thanks for your inquiry and the opportunity at earning your business. Using the links below you can review your options. Let me know if you need any further technical information or help placing your order. In either case I will be glad to assist! Link to Block Code/Serial Number Location http://www.perfprotech.com/store/app_themes/PPT/images/block-casting-no.jpg Link to Remanufactured Longblocks http://tinyurl.com/68kcet8 Link to Remanufacturing [...]

Suzuki Marine Outboard Motors – Replacing a Fuel Pump on a DF70
Step by Step Video Instructions illustrating how to change an electric fuel pump on a Suzuki DF70 outboard motor. Watch Video

Boat Trailer Parts and Accessories – How to Replace a Boat Trailer Hub
Step by Step video instructions illustrating how to replace a leaky oil filled hub on a boat trailer. Watch Video

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Engine Specifications 

 

 

Models

496 MAG HO

496 MAG

Propshaft Horsepower

4251

3751

Propshaft Kilowatts

3171

2801

Displacement

496 cid (8.1 l) 

Maximum rpm @ WOT2

4600-5000 rpm 

4400-4800 rpm 

Idle rpm in NEUTRAL2 

650 rpm 

Oil Pressure @ 2000 rpm

60 psi (414 kPa) 

Oil Pressure @ Idle

30 psi (207 kPa) 

Thermostat 

160o F (71o C) 

Firing Order 

1-8-7-2-6-5-4-3

Electrical System

12-Volt Negative (-) Ground

Alternator Rating - Hot

Operating Amps

65 Amps

Alternator Rating – Cold

Operating Amps

72 Amps 

Recommended Battery

Rating (Minimum)

650 cca/825 mca/150 Ah

 

 

 

 

 

 1 Power Rated in Accordance with NMMA (National Marine Manufactures’ Association) rating Procedures. 

2 Measured using an accurate service tachometer with engine at normal operating temperature.