1. N

    Mysterious Yanmar Vibration - Only in forward gear

    Hey, I have a Yanmar 3gm in my Hughes 36. At idle, I can rev the engine right up to 3000rpm with no abnormal vibration. The same can be said for when the boat is in reverse. However, when I shift into forward I can only get up to around 1100rpm before I notice significant vibration and engine...
  2. VernonJ

    Lubricant for impeller

    I have heard that I should lubricate the impeller on my Yanmar 2GM (Hunter 326) when I replace it. I have also heard to not use a petroleum based lubricant. So, what should I use and where can I get it?
  3. C

    Repowering Islander 36

    I’m considering purchasing a beautifully restored Islander 36, steeply discounted on account of a crack in the engine block (Yanmar 3gm30f). The quote for a local yard to repower is around $20,000 but there’s a used Yanmar 2gm20f for sale (running great) that’s affordable and seems to fit...
  4. S

    Flushing an Engine with Fresh Water?

    I have heard that I should flush out my Yanmar 1gm10 inboard diesel engine every time I run it in saltwater. Is that true? Is there an easier way to flush it, because it currently takes me about 20 minutes after each time I motor which is a pain?
  5. J

    Yanmar 3YM30 Help

    Just had my yanmar serviced (oil, filters, impeller, etc.). 300 hours and running well. After first trip out since service, I decided to recheck oil (cold and warm) and just make sure everything was in order. All is good. Except, I noticed a black zip tie that snapped...looked like it was...
  6. Sofraniaeth

    YANMAR 4JH3TE Slow throttle response when hot

    On my last two 8-10 hour passages when I started heading in to the dock I noticed the engine RPMs took 10 or more seconds to respond to lever commands. Even more so for reverse than forward. Made for a dicey docking evolution. While running, the engine goes into reverse or forward immediately, I...
  7. LVGS

    Pumping oil out of Yanmar 3YM30 from dip stick without removing oil filler cap

    In attempting to remove some excess oil from our Yanmar 3YM30 through the dip stick hole, I was unable to get very much out. I tried several times and chalked it up to the cold engine and/or ineffective pump. However, when reading the manual for the 3YM30, it specifically states that the oil...
  8. Tim Mills

    Piles of black smoke Yanmar 3GM30

    My boat has been sitting for about 2 months. I went to run the Yanmar 3GM30 tonight and this is what happened. Starts fine, idles and runs great when not in gear up to 3,000 rpm. In gear, piles of black smoke and won't run more than 2,000 with almost no forward propulsion. Fuel looks good. New...
  9. Chew Oon

    Yanmar 3GM30F cooling hose part no

    Hi, Does anyone know the part number for the raw water cooling hose. The parts catalog says 128291-49020 but no drawings to confirm. Couldn’t find any pictures on vendors web site neither. Thanks.
  10. T

    Engine Monitoring

    I have a 96 Hunter 376 with a Yanmar 3JH2E that has no gauges, just idiot lights for oil pressure and water temp. And because we only use the motor occasionally (in and out of dock) it would be prudent to know the thing is running within spec. So I found and interface that will work with my...
  11. geoffschultz

    Strange oil pressure fluctuations

    I have a 1997 Yanmar 3JH2-T(B)E turbo motor in my Freedom 40/40 and when I start it up, the oil pressure is low, but when I start motoring, it climbs to normal levels. Then after about 20-30 minutes, the pressure starts dropping to levels lower than I would like to see it. Quite often I can...
  12. Ken13559

    H326 with Yanmar 3YM30

    Has any H326 owners fitted a Yanmar 3YM30 on their boats? I'm keen to know if this 3YM30 engine will fit in to the existing compartment without need for modifying or alternating the steps Engine Cover or any woods of compartment. Thank you. Ken Y
  13. T

    Need to repower Legend 35.5

    What newer Yanmar swaps out 3GM30.. Looking for good deal on running take out that will easily drop in. Fla. 386 316 0725 ocean32114@yahoo.com
  14. Brigadoon460

    Hunter 460 Throttle Question

    Hello, I have a 2001 Hunter 460 with the flex-o-fold prop, previously my WOT was around 3600rpms. This put my cruising RPM's at around 2800. Over the last year i've noticed I can no longer get up to 3600rpm's. I top out around 2900. Thinking this could be because of a running gear or bottom...
  15. P

    Yanmar 2GM20F knocking sound

    Could someone help me diagnose this knocking sound coming from my 2GM20F engine> Halfway through the recording I am playing with the decompression levers to see if the sound changes. 1) When I lift the the decompression lever for cylinder 1, I get a pulsating feedback on my finger. 2) When I...
  16. Mohawk Jack

    Yanmar Engine Control Panel Upgrade

    I am the new owner of a 1980 Hunter Cherubini 30 ft with a fairly new Yanmar engine. Unfortunately the engine control panel is not as new and being and engineer, I'd like to know a little bit more about my engine while it is running. Has anyone here had experience with swapping out an old panel...
  17. py26129

    Yanmar 3GMF Engine mounts

    Hello everyone It's finally time to replace the engine mounts under my trusty Yanmar 3GMF. One option would be to replace like with like i.e. OEM Yanmar mounts. The other option would be to use a set of 3rd party mounts such as the R&D Marine mounts sold by PYI. What I am looking for is...
  18. JoeRickard

    Cold Weather Cruising ...

    I'm a Great Lakes sailor and have an Oceanis 45 (5th season). I'd like to prepare my boat for early spring long distance cruising, so I have two questions: 1. What is the best approach to having heat while under way? I have a very nice dometic system (heating & cooling), however it only works...
  19. C

    1980 Hunter 37 Cherubini Kanzaki KH18 Transmission

    I'm having some work done on my power train (fly wheel to prop) and the mechanic is asking for specs on the Kanzaki KH18 transmission. I've tried to find a service / parts manual on this equipment but keep coming up short. Most references I've found have correctly associated it with the Yanmar...
  20. Brezzin

    Variprop Pitch Adjustment on a Yanmar 4jh4hte

    I have a Variprop 4 blade thats slightly over pitched (only gets to 2900 of a max 3200) I've run it this way for a couple of years but I'm beginning to think that I'm not doing myself any favors here. So I want to adjust accordingly. Now the Yanmar specs say the rotation is counter...