REPAIR

Inspection

Inspect the vibration damper for dents, nicks or fluid leaks in the outer housing. If any of the above are evident, the vibration damper must be replaced. Due to the close clearances between the damper housing and its internal flywheel, dents or nicks may cause contact between the two components. Fluid loss will deteriorate the dampening effect of the damper.

Installation

1.Position the vibration damper and drive pulley on the crankshaft hub.

2.Secure with six mounting capscrews. Torque screws to 45 lb-ft (61 N•m).

Oil Pan Installation

The oil pan used on the MackPower™ M-E7 marine engine has a special nickel coating applied before being painted. Do not replace this oil pan with the automotive version of the pan. Do not use heavy abrasives to clean or remove the finish of this pan. Heavy abrasives can remove the nickel coating and cause subsequent oil pan corrosion.

DESCRIPTION (ISOLATING OIL PAN GASKET)

Reducing oil pan vibration is an important step in reducing engine noise and ensuring oil pan integrity, especially at the high power levels of today’s engines. For this reason, the isolating oil pan gasket arrangement is used on all engines.

Most noticeable about this arrangement is the use of a 1/4-inch (6.35 mm) thick rubber gasket and the elimination of the reinforcement strip on the pan rail and the belly bands on the oil pan. The thicker, more conformable isolating gasket will substantially improve sealing, especially over a long period of time.

Serviceability is also improved. When the oil pan is removed, unlike the fiber gasket, it is not necessary to scrape the gasket from the cylinder block and the oil pan. In fact, this gasket, in most cases, can be reused.

Also used are shouldered oil pan bolts that bottom on the cylinder block rather than the oil pan, and rubber isolators installed between the heads of the pan bolts and the oil pan. Together, these isolators and the isolating gasket eliminate metal-to-metal contact between the bolts and the oil pan, significantly reducing the amount of engine vibration transmitted to the pan.

Figure 298 shows both the fiber oil pan gasket arrangement and the isolating oil pan gasket arrangement.