Mercury 3.0L Carbureted Alpha Specifications download pdf (Page 5)

496 Mag & 8.1S Calibrations that Reduce the Amount of Soot

Produced

There have been complaints of MCM 496 MAG and MIE 8.1s units, both Base

and H.O., causing soot deposits on boats. A new calibration has been released

that significantly reduces the amount of soot produced. These calibrations will be

available through P&A in replacement PCM's.

Whether, or not, a boat will develop soot deposits is very much dependent on the

boat design, especially the exhaust locations and transom configuration. Boats

with molded swim platforms with thru-transom exhaust exiting below the swim

platform, are most likely to experience sooting. This is because a low pressure

area develops beneath the swim platform, when the boat is moving, which holds

the exhaust in this area and allows it to settle on the boat surfaces. This "station

wagon" effect in some boats has also caused soot to settle on the top side of the

swim platform, on the engine cover/sun deck and on other surfaces. If a

customer's boat, with a 496 Mag/8.1S engine, has this problem then contact

MerCruiser Service.

The next page shows the before and after view of a boat that had this sooting

problem. The calibration change made a 70-80% improvement in this condition.

It is recommend to use a cleaning product called Castrol Super Clean when

cleaning the boat. Some cleaning products, such as wax and PowerTune, leave

a residue that promotes the formation of soot deposits. Castrol Super Clean has

been found to not leave such a residue, and will remove the residue left by

previous cleaning products.

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Mercury 3.0L Carbureted Alpha Specifications Page 5