Main Engine & GenSet

Main Engine - Yanmar - 1990 - 77 HP Turbo Diesel

As part of preparing to take delivery of the boat, we brought in a mechanic to do a deep dive on the engine. He found a few items that need to be addressed in order for us to be comfortable with the mechanical state of the engine.

Required maintenance items

1. The coupling that the engine coolant inlet hose is attached to on the heat exchanger is badly corroded. The concern is that if this fails, we lose the coolant loop on the engine and cause the engine to overheat. In order to remediate it, we will need to replace the entire heat exchanger.

2. The engine is smoking a bit while running. This is an indication of fuel injector issues. They likely need to be rebuilt.

3. The hose clamps that hold the shaft seal tight around the shaft are badly corroded and will fail soon. We will replace the seal with a dripless while we have the chance.

4. The serpentine belt on the engine isn't tight enough and is rubbing on the water pump creating a groove in the hose. It needs to be replaced - TBD with Balmar Alternator plan

5. There is high output alternator that wasn't installed properly and was left in place. It needs to be removed. We may replace it with our Balmar Alternator from storage

6. There is quite a bit of rust around the housing and the engine mounts are pretty corroded as well. We need assess their viability.

7. The Exhaust vent loop pressure relief valve is spewing water while the engine is running and must be replaced.

8. The propellor shaft has to be replaced due to galvanic corrosion.

9. The propellor is suspect due to galvanic corrosion and must be sent to a metallurgist to ascertain fit for use.

10. Inspect Diesel tanks - remediate as required (clean etc) - replace sender system to feed ActiSense NMEA 2000 bridge

Planned upgrades

1. Replace the oil and coolant senders with senders that will trigger an alarm if limits are reached as well as provide discrete values that can be read by our Actisense analog to digital converter and placed on the NMEA 2000 backbone for use on the Garmin MFDs

2. Add a raw water flow sensor (AquaAlarm)

3. Add a exhaust temp sensor (AquaAlarm)

4. Clean up the engine exterior

5. Verify complete function of the cockpit engine panel

6. The starter batteries are still viable, but once we do the lithium upgrade, they can be replaced with SolidState lithium batteries that are capable of being used as crank batteries. They will be switchable to integrate with, or be backed up by the house bank(s).

7. Add water in fuel sensor to RACORs - from storage - tie into the Master Alarm Panel

8. Add Fuel Vacuum sensor to RACOR - new purchase - tie into NMEA 2000 Backbone

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Well that was the plan ---- We did a compression test and cylinder #2 failed. This points us towards a rebuild. We were also able to track down more documentation that led us to believe that this engine has in excess of 8000 hours on it. With limited parts for a 35 year old engine that wasn't made since 1999, we decided to replace the entire engine. So we have a brand new Yanmar 80 HP Turbo Diesel now on order to install.

So now our to-do list looks very different. First of all the engine is already 24 VDC, comes with a high output Alternator (also 24VDC) and has a NMEA 2000 interface for monitoring, so all of the items related to those activities are already taken care of. This leaves:

1. New dripless shaft seal while we have the chance.

2. Replace the corroded engine mounts before reinstallation.

3. The Exhaust vent loop pressure relief valve is spewing water while the engine is running and must be replaced.

4. The propellor shaft has to be replaced due to galvanic corrosion.

5. The propellor is suspect due to galvanic corrosion and must be sent to a metallurgist to ascertain fit for use.

6. Inspect Diesel tanks - remediate as required (clean etc) - replace sender system to feed AlbaCombi NMEA 2000 bridge - more on this on the plumbing page

7. Add a raw water flow sensor (AquaAlarm)

8. Add a exhaust temp sensor (AquaAlarm)

9. Clean up the engine room to include additional layer of sound proofing

10. Add water in fuel sensor to RACORs - from storage - tie into the Master Alarm Panel

11. Add Fuel Vacuum sensor to RACOR - new purchase - tie into NMEA 2000 Backbone