Following is a list of maintenance completed on Invincible Summer since purchase as well as upcoming scheduled maintenance during the upcoming winter layup. There is a combination of required maintenance, preventative maintenance, and also many items we replaced for updated cosmetic reasons.

Completed Work, by Year

2021/2022:
[Service completed by Tower Marine, Douglas MI, except as noted]:

• Serviced mains and generator
• Replaced impellers on mains and generator
• Replaced Cablemaster cord connector
• Replaced leaking plastic water connectors on water heater with brass connectors (by owner)
• Replaced cockpit ice maker (by owner)
• Replaced mid-ship bilge pump
• Replaced hydraulic cylinders on head cover
• Replaced hydraulic cylinders on stern locker
• Replaced microwave with combo microwave/air fryer/convection oven (by owner)
• Replaced coffee pot (by owner)
• Removed vinyl boat name lettering. Wet sanded and polished transom. Replaced boat name with custom stainless steel lettering ($3,200)
• Replaced all mattresses with custom made premium mattresses ($4,500, Spine Align, Holland, MI)
• Replaced A/C water pump and descaled both condensing units
• Serviced Raymarine Chartplotter; new PCB & updated software (Seawire Marine, Miami, FL)
• Replaced courtesy ceiling lights in aft stateroom with integrated LED (by owner)

2022/2023:
[Service completed by Anchorage Marine, Holland MI, except as noted]:

• Serviced mains & generator
• Replaced generator impeller
• Replaced transom door with stainless steel door custom made by Austin Metalworks (by owner, $3,100)
• Rebuilt hydraulic cylinders & replaced o-rings/seals on swim platform ($7,500)
• Bottom paint
• Replaced vinyl on sunpads (Automotive Interior and Top Specialists, Holland MI)
• Replaced swim platform control & connector (by owner)
• Removed vinyl stripe along gunwale
• Wet sanded, wax & polish entire hull ($4,700)
• Replaced engine air filters (Baldwin Heavy Duty #PA3867, replaces Cummins #3924540) (by owner)
• Replaced forward stateroom blinds with custom made blinds (Calico Interior Design, Austin, TX)
• Replaced curtains both aft staterooms with custom curtains (Calico Interior Design, Austin, TX)
• Installed new Magma Grill (by owner)
• Replaced courtesy ceiling lights in salon, forward stateroom, and both heads with integrated LED (by owner)
• Replaced fresh shore water regulator (by owner)
• Replaced deckwash water outlet with stainless steel flush-mount hose quick connection (by owner)
• Overhead Reset (tune-up) and adjust idle RPM on Cummins Engines (Cummins Sales & Service, Grand Rapids, MI)
• Replaced all engine hoses (Cummins Sales & Service, Grand Rapids, MI)
• Replaced grid heater relays on both engines (Cummins Sales & Service, Grand Rapids, MI)
• Repaired vinyl wall near stairs by light switch and vinyl wall by couch near entrance to forward stateroom (Fibrenew Lakeshore, Holland, MI)
• Replaced cockpit refrigerator (by owner)

2023/2024:
[Service completed by ME-YR, Holland, MI, except as noted; Total work: $67,000]

• Main Engines:
• collect oil samples from engines and transmissions (samples from all units normal/within spec)
• changed oil and filters
• changed transmission oil and filters
• replaced raw water impellers
• checked engine mounts
• Replaced belts
• inspected hoses and clamps
• cleaned and oiled air filters
• Replaced pencil anodes in both engine heat exchangers and starboard exhaust
• run engines and top-off fluids
• inspected cooling side of the main engines, clean raw water strainers and test coolant concentration
• replaced raw water seacocks & sea water hoses from seacocks to strainers

• Generator:
• collect oil sample (sample normal/within spec)
• changed oil and filter
• Replaced fuel hose
• changed fuel filters
• replaced raw water impeller
• replaced engine air filter element
• Replaced both belts
• inspected engine mounts
• Replaced sea water cooling supply hoses
• Replaced pencil anode
• checked and topped off coolant
• cleaned raw water intake strainers
• lubricated intake valves

• Fuel System:
• changed primary and secondary fuel filters
• cleaned Racor filter assemblies & replaced o-rings/seals
• primed fuel system
• added fuel treatment to tanks

• Cooling System:
• cleaned raw water intake strainers
• lubricated intake valves
• checked and topped off engine coolant level
• tested coolant concentration
• replaced coolant filters for main engines

• Running gear:
• replaced cutlass bearings
• inspected propellers, rudders and struts
• inspected shaft seals
• inspected couplers
• inspected rudder seals
• Replaced & repositioned steering linkage cylinder rod end and associated hardware
• checked steering fluid, topped off and bleed/pressurized system as needed
• Replaced anode for starboard & port prop shafts, trim tabs and hull

• Batteries:
• Repaired 20A charger (replaced bad crimp connection on DC charge lead)
• load tested all batteries and replaced generator battery with group 27 size
• checked and topped off battery water
• checked and protected terminals with corrosion protectant
• inspected alternators, starters, and electrical connections
• inspected trays, tie downs, and hardware

• Mechanical Service - Additional
• Replaced forward bilge pump
• Replaced three (3) Co2 detectors (by owner)
• Replaced shower sump (by owner)
• Replaced fresh water pump
• Reworked incoming shore water to plumb into pressure side of fresh water pump instead of supply side
• Installed new Air-Lock Air Purifier System (by owner)
• Replaced lazarette switch
• Replaced all blower ducts in engine room & lazarette
• Inspected Fireboy fire suppression system: Passed (Northwest Fire, Elk Rapids, MI)
• Inspected fire extinguishers: 1 extinguisher replaced due to recall (Northwest Fire, Elk Rapids, MI)
• Replaced halogen accent lighting with LED in main cabin and forward stateroom (by owner)

• Shipwright/Structural/Carpentry/Outside Service:
• Repair sliding cabin door for smooth operation. Remove helm. Repair sliding door track and trolleys. Reinstall helm.
• Removed and reset stainless steel thru-hull exhaust ports and transom underwater lights
• Grind out hull blister in engine room and repair
• Dry wet spots in hull & compound fill (Dryboat, Grand Rapids, MI; Hull now has 5-year warranty)
• Replaced fresh water tank (55 gallon)
• Replaced interior Whisper Wall ceiling; all new track & new fabric (Custom Yacht Interiors & Design, New Bern, NC - Flown in to complete work)
• Replaced captain chair swivel/bearings (by owner)

In-Process Work

2024/2025:

[Currently in-progress at ME-YR, Holland, MI]

• Service mains and generator: Oil & filter change & inspect belts, hoses, electrical connections
• Inspect all batteries
• Replace Racor bowls
• Replace raw water hose from strainers to mains
• Replace raw water hose from A/C seacock to condensing units
• Repair oil change system
• Replace coolant hose from heat exchangers to recovery tanks on mains and generator
• Reposition & secure ice maker in cockpit to fit into opening better
• Replace caulking between bottom of cockpit windows and hull on both starboard and port sides
• Scuff and paint bottom
• Replace instrument cluster gauges
• Inspect all underwater through-holes/screens
• Balance drive shaft
• Prop scan, fine tune/finish and balance props to within ISO Class 1 pitch tolerances
• Replace port & starboard running gear lip-style shaft seals
• Replace VacuFlush duckbill valves, bellows and gaskets on both bowls
• Replace VacuFlush hoses from toilet to vacuum generator and from vacuum generator to holding tank. Replace waste discharge hose. Replace vent hose (w/no vent filter). Note: Current vent hose exits bow and is too long for proper holding tank oxygenation. If possible, add shorter vent hose that exits either port or starboard side.
• Install new Groco Sweetank Odor Neutralization System for black tank
  
• Repair scratches on hull above and below gunwale on port mid-ship
• Replace fridge/freezer in salon with a stainless steel Vitrifrigo DP2600IXD4-F-3 with door hinges on left side
• Cosmetically repair hull from DryBoat work
• Remove wash-down pump on starboard side of starboard engine.
• Cosmetically repair small area on hull above anchor
• Replace seals in 2 swim platform actuators
• Replace rods in 2 swim platform actuators
• Make and secure new canvas cover with rubber seal edges on top and both sides for deck anchor locker to protect against rain/water intrusion
• Replace shower control valve and wand in forward head
• Replace canvas/eisenglass enclosure (quotes outstanding)
• Replace/update helm switches (by owner)
• Replace salon telephone outlet with 110v/USB outlet (by owner)
  
• Wash & wax hull

Future Work

2025/2026:

• Service mains and generator: Oil & filter change & inspect belts, hoses, electrical connections
• Change impellers in mains & generator
• Replace 3 main batteries
• Replace/update cockpit vinyl
• Replace/update cockpit headliner
• Remove 50A and 20A battery chargers and replace with one (1) 60A 3-bank charger
• Inspect/flush heat exchangers
• Wash & wax hull