M60 Engine Changes

M60 ENGINE CHANGES

- New Alternator







The 140 amp alternator is equipped with a monitoring circuit for additional fault checks including, defective stator windings,damage to the alternator diodes, exciter circuit and overvoltages as well as V-belt breakage.

The new design is recognizable by the three pin connector.

- New filter housing and oil filter







The new lower profile oil filter housing is mounted to the driver's side inner fender well.

The oil inlet and outlet hoses are new to match the new location of the housing.

- New Engine, Transmission and Steering Oil Coolers.







The efficient aerodynamic design of the E38 required the reduction of air intake ports at the front of the vehicle. The air intake for radiator/condenser cooling is the only air inlet at the front of the vehicle.

The engine, transmission and steering system oil coolers are located together in a centralized frame that is situated between the radiator and A/C Condenser.

- New Engine Oil Level Sensor







The 740i includes a new electronic engine oil level sensor. This sensor will be phased into production for all engines except the M42.

Like the previous float level sensor the electronic level sensor is located in engine sump mounted to the engine oil pan.

The probe of the level sensor contains two temperature sensing elements.
- One senses the engine oil temperature.
- The other is heated to 10° C above the temperature of the engine oil and then allowed to cool.

The length of time it takes to cool the heated element is how the sensor determines the engine oil level. When the oil level is high it covers a larger portion of the probe submersed in the oil sump. The engine oil around the probe absorbs the heat of the heated element quicker than if the level is low

The microprocessor in the base of the sensor produces a pulse width modulated signal proportional to the oil level. The pulse width decreases with a decreased level of oil.

- Pistons












The E38 M60 pistons have been modified as follows:
- the height of the fire land has been increased by 1 mm (total height = 8mm).
- the oil control ring has been shortened by 1 mm.

These modifications have decreased the temperature exposure of the upper compression ring and improved the oil control characteristics of the piston.

- Exhaust system







The symmetrical dual exhaust system has two 4" diameter, single monolith catalytic converters. Each side of the exhaust system shares a common middle silencer which is mounted by a cross member to the under side of the body.

The rear mufflers are mounted to the rear axle support and the floor pan of the trunk compartment by brackets. The tailpipes of the mufflers slope downward.