{Stus-List} Diesel leak at secondary filter housing - 3GM30F

David Blair dblairinc at telus.net
Mon Jun 1 23:27:00 EDT 2009

Thanks for the various tips. As of today everything is inspected and reinstalled with a dab of yellow Locktite. I'll be putting a mark on the ring and watching it very carefully. My mechanic is suspecting vibration is a factor - says there seems to be more than the usual vibration from the 3 blade MaxProp although it seemed to work fine to me and was serviced last August (we're in the water year 'round). Cheers everyone.
  ----- Original Message ----- 
  From: Jeff Cole 
  To: cnc-list at cnc-list.com 
  Sent: Monday, June 01, 2009 5:56 AM
  Subject: Re: {Stus-List} Diesel leak at secondary filter housing - 3GM30F

  I second the tapping procedure below from John or Maryann.  When the PO of my boat showed me that, I thought it was BS, it just seemed wrong.  I recall later being surprised to read the recommendation to do this in an authoritative source, which I can't place at the moment but possibly it was an actual Yanmar document. 

  I use this regularly, just yesterday in fact. Just a few taps from the hammer to the screwdriver placed tangentially on one the ridges of the ring will snug it up nicely.  Removal  is then the reverse - tap a screwdriver on a ridge in the opposite direction to loosen. I have a 3QM30 but looking at pictures on the 'net it appears to be the same or similar housing on the 3GM30F.

  Consider checking the O-ring as well if the problem persists, or a cracked ring as Rich suggested.


  1979 C&C Landfall 38 "Masala"

  John and Maryann Read wrote: 

    Are you referring to the filter mounted on the engine that is hard to get at and has several proud surfaces?

    My mechanic recommended install hand tight, then a gentle tap with a hammer to a screwdriver placed against the holding nut indentation.  Works like a charm

    John & Maryann Read 

      -----Original Message-----
      From: cnc-list-bounces at cnc-list.com [mailto:cnc-list-bounces at cnc-list.com]On Behalf Of David Blair
      Sent: Monday, June 01, 2009 12:10 AM
      To: cnc-list at cnc-list.com
      Subject: {Stus-List} Diesel leak at secondary filter housing - 3GM30F

      Has anyone experienced the tightening ring on the secondary filter housing working itself lose after 2 or 3 hours of running time? After the first episode(which was after a filter change and bleeding) and getting back to the dock a qualified mechanic checked and reinstalled the filter, etc again. Seemed good, but 3 running hours later its worked itself loose again, more diesel in the bilge.. Threads look good (ie: don't appear stripped), Yanmar authentic filter element carefully centred and ring threaded fully up and hand tight, etc. 

      Any suggestions?
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