• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.

Announcement

Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Yamaha 90 Oil Injection Failure

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts


  • Yamaha 90 Oil Injection Failure

    I ran my 1993 Yamaha 90 today after about 3 months of storage. (Plenty of oil in the engine tank) The boat ran fine at high speed for a few minutes then the engine began to falter and died. My guages are very cloudy and hard to read so I don't know if any of the warning lights are working but I'm pretty sure it is not getting oil. (No Smoke) It will idle ok but after a few moments of mid speed it gets noisy. How can I check the oil flow? Since it still idles fine and runs for a few moments at higher speeds is there a chance I have not yet ruined this engine?


  • #2
    Re: Yamaha 90 Oil Injection Failure

    hello did you bleed the system after storing it? have you ever cleaned the tank and tank filter? the only way to know is by dissasembly and inspection. overheat will cause the same symptoms. when was the last alarm circuit test done? the oil injection on a yamaha is about as bullet proof as you can make a piece of machinery,however it requires maint like everything else. and maint does not mean just add more oil.
    no tech questions by PM, they wont get answered.
    you have to be trusted by the people that you lie to .

    Comment



    • #3
      Re: Yamaha 90 Oil Injection Failure

      No I did not bleed the system nor have I ever cleaned the tank. or filter. It's pumping great water preasure and does not feel hot to the touch and the heat alarm works good. Is there a hose that I can pull while at idle to see if oil is moving?

      Comment



      • #4
        Re: Yamaha 90 Oil Injection Failure

        hello I suspect rather than a precision blend failure we are dealing with a customer neglect failure. much more common than pump failures.somewhere in your service manual there is an oil consumption test. all the tests require the engine to have a 50-1 premix while running the test. I cannot remember the output specs but you unplug the hose downstream of any inline check valves,if used, and run the engine at the specified RPM for the specified time and collect the oil. the details are in the manual. but remember he pre mix while doing it.
        no tech questions by PM, they wont get answered.
        you have to be trusted by the people that you lie to .

        Comment



        • #5
          Re: Yamaha 90 Oil Injection Failure

          Running the motor on 50:1 fuel I have removed a few oil lines but NO oil is flowing anywhere. Can someone explain the theory of opperation. What drives the pump?

          Comment



          • #6
            Re: Yamaha 90 Oil Injection Failure

            its gear driven from the crankshaft.

            Comment



            • #7
              Re: Yamaha 90 Oil Injection Failure

              Time to purchase a workshop manual! Absolute must if you plan on doing your own maintenance.

              Comment



              • #8
                Sign up today
                Re: Yamaha 90 Oil Injection Failure

                Does the motor run properly on premix? If so it points to the oil pump not working... could be broken or just needs bleeding. After buying the manual as suggested, follow the bleed routine and do the test again. If still no oil flow it could be an airleak in the lines or a broken pump. I'm not an expert but had this problem a few years ago on a Yam 50 and it was because I hadn't bled the oiling system.
                TABS 580 Ocean Series - Sold!
                Yamaha F115 - Sold!
                Holden Rodeo LT crewcab ute - still going strong.

                Comment


                Working...
                X