Westerbeke 90A FOUR — Changing the Transmission Fluid (Hurth HSW)
Maintenance
For the Westerbeke 90A FOUR, from the Westerbeke operator's manual.
Before you start
- Never pull out the dipstick while the engine is running. Hot fluid will splash from the dipstick hole.
Procedure
- Push a suction pump hose down through the pipe hole (under the filter) to the bottom of the housing and suck out the fluid.
- Remove the oil return line from the cooler and allow the oil to drain into a container, then reconnect the line.
- Wipe down the transmission and properly dispose of the used fluid.
- Pour in new DEXRON III ATF fluid and check the quantity with the dipstick.
- Reinsert the filter assembly into the housing, press it in place and tighten the Allen screw.
- Run the engine, shut down and recheck the fluid level.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- HSW450 - 2.12 quarts (2.0 Liters)
- HSW630 - 3.2 quarts (3.0 Liters)
- HSW630V - 4.2 quarts (4.0 Liters)
Source: Westerbeke operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.