Westerbeke 90A FOUR — Engine Oil Change
Maintenance · Engine Oil / Oil Filter
For the Westerbeke 90A FOUR, from the Westerbeke operator's manual.
Before you start
- Used engine oil contains harmful contaminants. Avoid prolonged skin contact.
Procedure
- Discharge the used oil through the sump drain hose while the engine is warm.
- Replace the hose in its bracket and replace the end cap securely.
- Remove the old oil filter; inspect that the rubber sealing gasket comes off with it.
- Wipe the filter gasket's sealing surface on the bracket free of oil.
- Apply a thin coat of clean engine oil to the rubber gasket on the new oil filter.
- Screw the filter onto the threaded nipple and tighten firmly by hand.
- Add new oil through the oil filler cap on the top or side oil fill.
- Run the engine and check oil pressure and for leaks around the new filter.
- Check the quantity of oil with the dipstick; fill to, but not over, the high mark.
Tools required
- Small automotive filter wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Thread size for the lube oil drain hose capped end is 1/4 NPT
- Do not overtighten oil filter
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.