What is included in a 100-hour service for a Four Winns 230?
I have a 2004 Four Winns 230 and it is due for its 100-hour service. It has a V8 engine. What exactly needs to be checked or replaced, and what parts will I need to buy if I decide to tackle this myself?
Answer
A 100-hour service on a 2004 Four Winns 230 focuses primarily on the engine and sterndrive, requiring an oil change, gear lube replacement, new fuel filters, and a raw water impeller check. You will also need to grease the gimbal bearing and steering components, replace the sacrificial anodes, and inspect the outdrive bellows for signs of perishing.
Engine Fluids and Filters
Most 2004 Four Winns 230 models run a 5.0-litre or 5.7-litre V8 sterndrive (typically a Volvo Penta GXi or a Mercruiser MAG MPI). Warm the engine on a hose flusher (muffs) to thin the oil. Turn off the ignition. Extract the oil through the dipstick tube using a vacuum pump like a Pela extractor. You need 4.5 to 5.5 litres of marine oil. Mercruiser engines take a 25W-40 synthetic blend. Volvo Penta blocks require 15W-50. A 5-litre jug costs around £50 to £60.
Swap the oil filter. Check the old rubber O-ring has not stuck to the engine block. Smear clean oil on the new O-ring. Tighten the filter by hand until it seats, then add a quarter turn. Replace the spin-on water-separating fuel filter. Fill the new unit with clean petrol before installation to prevent airlocks and hard starting. Dispose of the old filter safely. Petrol fumes in the bilge are highly explosive. Always run the bilge blower for five minutes before starting the engine.
Sterndrive Maintenance
Outdrive maintenance anchors the 100-hour service. Drain the gear lube. Remove the bottom drain screw first, followed by the top vent screw. Check the draining oil for a milky appearance. This indicates water ingress and a blown seal. Inspect the magnetic bottom drain plug for metal shards. A fine metal paste indicates normal wear. Large splinters mean gear damage.
Refill the drive from the bottom up using a gear lube pump. Stop when oil flows out of the top vent hole without bubbles. You need 2 to 3 litres of high-performance gear lube (Quicksilver High Performance or Volvo Penta Synthetic). Install brand-new drain screw washers before tightening the screws. Reusing crushed washers causes most outdrive water leaks.
Remove the propeller. Check the propshaft for discarded fishing line. Monofilament line wraps around the shaft and cuts the prop seal. Clean the splines. Apply a generous coating of marine grease. Reinstall the propeller and torque the nut to 75 Nm (55 lb-ft).