The first 10 hours of use are when you are breaking in your new or rebuilt engine. It's important to follow these guidelines so that your engine and all it's parts are sufficiently lubricated and will continue to run smoothly in the long run.
Two-Stroke Oil Injection Outboards
During break-in, all new Precision Blend engines should be run on double oil, with the exception of HPDI motors, which use straight gas for break-in. This means you need to run all PBS-equipped engines on a 50:1 oil mix during the 10-hour break-in period to supplement the oil supplied by the oil injection system. This additional oil provides further protection during the oil pump setup and furnishes extra lubricating oil during the break-in period.
Two-Stroke Premix Outboards
Pre-mix engines that normally run on a 50:1 ratio will need a break-in oil ratio of 25:1 during the first 10 hours of operation. Engines that normally run at 100:1 should be run at 50:1 during break-in. After the 10-hour break-in period, use the regular oil ratio.
]]>A propeller converts the engine’s power to thrust that drives the boat. As the propeller turns, low pressure is created on one side and high pressure is created on the other side. The propeller moves toward the low pressure, moving the boat with it. How well a propeller moves toward the low pressure depends on several factors.
No one single propeller design will work for all applications. Hull weight and available horsepower dictate what will work for best for you. You need to keep in mind the operating range of the engine and select a propeller that will allow the engine to come close to its maximum RPMs at WOT (wide-open throttle).
Two important terms to become familiar with are ventilation and cavitation. Both are issues that can occur from poor rigging, improper prop selection, or a damaged propeller.
Ventilation is a problem that means air is being pulled into the propeller from the surface of the water or from exhaust gasses while in reverse. The ventilation plate on the lower unit tries to limit this problem. Prop design or high mounting height can be possible sources for this issue. It is not unusual to vent the prop with some hull designs during hard turns.
Cavitation describes water that is actually boiling on a surface because pressure has dropped so low. A damaged prop blade will cause a very low-pressure area behind the damaged area. Water boils at 212 degrees at sea level. Dropping the pressure on a prop blade enough will cause the water to boil until it moves across the blade to a high-pressure area.
]]>• Install .0002" larger jets in carburetors.
• Max timing MUST be retarded 2 degrees.
• Max timing MUST be set with engine running over 4500 RPM & under load. DO NOT STATIC SET MAX TIMING.
• Install .0002" larger jets in carburetors.
• Max timing MUST be retarded 2 degrees.
• Max timing MUST be set with engine running over 4500 RPM & under load. DO NOT STATIC SET MAX TIMING.
• Re-torque cylinder heads to specs.
• After 1 hour of break-in, allow engine to cool and retorque heads.
• On 3 Cylinder engines, replace water pump with new high pressure water pump.
• On 3 Cylinder engines, drill and relocate overboard sensors.
• On 3 Cylinder engines, check latest OMC service bulletins and jet carburetors accordingly. THIS IS VERY IMPORTANT.
• Use 92-94 octane premium fuel.
• Clean and refill oil tank with TCW-3 oil.
• Mark oil tank to verify oil consumption during double oil usage of break-in period.
• Run double oil during the first 30 gallons of fuel.
• If running oil injection use 1 pint oil per 6 gallons gas.
• If no oil injection, use 1 quart oil per 6 gallons gas.
• OBR recommends installing water pressure gauge to monitor water flow.
• OBR suggests removal of oil injection system or updating to latest VRO pump.
• OBR recommends you replace water pump and gasket at time of powerhead replacement and every 2 years afterwards.
The following is the procedure for break-in your new powerhead.
]]>The following is the procedure for break-in your new powerhead.
]]>• Check latest Mercury Service Bulletins online (Google It or just contact us).
• Install .0002" larger jets in carburetors.
• Max timing should be retarded 2 degrees.
• Remove advance box if installed.
• Remove idle stabilizer if installed.
• Check latest Mercury Service Bulletins online (Google It or just contact us).
• Install .0002" larger jets in carburetors.
• Max timing should be retarded 2 degrees.
• Remove advance box if installed.
• Remove idle stabilizer if installed.
• Rebuild carburetors and fuel pump.
• Retorque heads to 40 ft/lbs.
• After 1 hour running, allow engine to cool and recheck torque. Retorque to factory specs if necessary.
• OBR suggests removing oil injection system.
• If oil injection is used, replace 2 PSI oil valve and check oil pump bushing and seal.
• Clean and refill oil tanks with TCW-3 oil.
• Verify oil consumption during break-in by marking the oil tank level.
• Check overheat alarm system and horn.
• On 2.5 EFI engines, fuel pressure should be 39 lbs. minimum.
• 2.5 EFI engines may have as many as 7 fuel filters, remove the cone shaped filter inline below the electric pump.
• Use newest style head gaskets and replace every year to prevent failure.
• Replace water pump impeller and gasket every year to prevent head gasket failure.
• Use 92-94 octane premium fuel.