Westerbeke Generator 7.2Kw Water In Oil Need Help

Discussion in 'Sport Yachts/Yachts' started by midexp, Jun 29, 2018.

  1. midexp

    midexp Active Member

    115
    Oct 5, 2016
    Harrison Township, Michigan Lake St.Clair
    1999 40' Sundancer
    454 merc
    I found out during an oil change on my Westerbeke generator that I have a lot of liquid in the oil. I'm really puzzled how it's getting there. First off, I don't believe it's coolant, so I don't think the head gasket is bad. The coolant is completely full and I get about a quart more in the oil from running for 15 minutes (engine holds 3 qt.). I have attached a diagram of the water and cooling system. I just can't see how water could get into the engine. The generator fires right up and runs great. I've read threads on this issue where people are saying the water pump is bad, but the W/P or systyem on this unit is not connected to the engine in any way. Westerbeke has a note talking about water in oil from "a fault in the exhaust system attached to the engine and siphoning through the raw water cooling and into the engine". Not sure what this means? Has anyone ever had this issue and how was it fixed?
    Thanks
     

    Attached Files:

  2. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    601
    Jun 5, 2016
    Milton, GA
    410 Sundancer 2001
    Cat 3126 V-Drives
    Hey Midexp

    Did you dispose of the old oil? If you can retain it, get an oil analysis performed. They are about $20 and would be able to discern water vs antifreeze. What is the year/model of your genney? Was this oil in the engine over the winter? One possibility would be condensation built up in the crankcase over the winter/spring. Change the oil and you will be OK. But then again...that would be a lot of condensation.

    The reference to the fault in the exhaust system is to the anti siphon valve that is supposed to be installed in the exhaust line. It prevents engine from pulling water back through the exhaust. Is yours installed? Might it be plugged up? Mud dobbers do a number on vent inlets sometimes. It looks like an upside down J trap in the exhaust line. Here's the installation manual, exhaust system details start on pg 11.
     
    Last edited: Jun 29, 2018
  3. Gary B

    Gary B Member

    156
    May 20, 2015
    Long Island
    2007 52 Sedan Bridge
    Cummins QSM 11
    I think we had the same generator in our 1998 400EC. The factory did not install an antisiphoning valve or even a simple water intake loop. As a result if we cranked it a lot to get it started it would frequently suck water into the engine. If you don’t have the anti siphon valve and an exhaust loop you may want to install them.
     
  4. midexp

    midexp Active Member

    115
    Oct 5, 2016
    Harrison Township, Michigan Lake St.Clair
    1999 40' Sundancer
    454 merc
    dtfeld,

    Genny is a 1999. I'm not familiar with an anti-siphon valve. I can't see water coming in from the exhaust. When I ran the genny, the boat was tied up in the well. And I can see plenty of water coming out the through hole in the side of the boat.

    I don't believe you attached the manual?
    Thanks
    ater
     
  5. midexp

    midexp Active Member

    115
    Oct 5, 2016
    Harrison Township, Michigan Lake St.Clair
    1999 40' Sundancer
    454 merc
    Thanks, but how could water get in just sitting at the well? And my boat has a big loop in the exhaust line, plug a big can muffler. And plenty of flow coming out.
     
  6. Gary B

    Gary B Member

    156
    May 20, 2015
    Long Island
    2007 52 Sedan Bridge
    Cummins QSM 11
    If the generator is hard to start and it’s cranked for more than a few seconds our westerbeke used to back suck water into the generator making the oil milky. The trick was to only crank it for a couple of seconds at a time. We too had a canister exhaust for the generator and we still had water in the engine a few times. We did not have the exhaust loop from the factory which it really should have had.
    We eventually replaced the generator and when we did we installed an anti siphon valve that opens electrically once the generator gets up to rpm. only then will it allow water to flow to the generator. We never had water in the new generator when we had the antisiphon valve.
    Hope this helps
     
  7. midexp

    midexp Active Member

    115
    Oct 5, 2016
    Harrison Township, Michigan Lake St.Clair
    1999 40' Sundancer
    454 merc
    Thanks Gary. I wonder why this isn't a more talked about problem. Seems like all 400 Sundancers would have this.
     

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