Transmission Fluid; Checking Fluid Level - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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Transmission Fluid

NOTE: Due to the various installation angles and oil cooler set-ups, it may be necessary to

adjust oil level.

Do not remove dipstick with engine running. Hot oil can cause burns.

Clean around the area of the dipstick before removing. Small particles of dirt can

cause damage to internal components and cause valves to stick.

IMPORTANT: DO NOT allow fluid level to drop below the bottom line.

TRANSMISSION WARM

The transmission should be at operating temperature (190 maximum) to get an accurate

oil level reading. Oil will expand when heated. Oil will drain back from the cooler. Expansion

and drain-back can significantly affect oil level.

1. When the transmission is at operating temperature, place selector lever in neutral.

2. Shut off engine.

3. Carefully remove dipstick and wipe clean.

4. Immediately insert clean dipstick and read oil level.

NOTE: Oil level must be checked immediately after engine shut-down to prevent an incor-

rect reading. Oil drains back into the transmission from the cooler and cooler lines.

5. Add or remove oil as necessary until the oil is at the required mark.

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SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999

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