• 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.
  • ALL iboats Forum Members and Guests:
    To show our appreciation for your participation in the Forums, we're offering an exclusive Forums-only discount good for an additional 5% off your iboats.com order for a limited time.
    To redeem, simply call our Customer Service Team at 800-914-1123 (Open M-F, 9am - 8pm Eastern Time) and mention the Forums 5% off discount. Offer excludes engines, trolling motors, and electronics.

Announcement

Announcement Module
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 threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

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

3. Do not take over someone elseís thread (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 thread of your own.

4. If you have a question for the original poster (OP) and the thread 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 thread.

5. By starting your own thread, 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 thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread 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 thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread 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 thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

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

'71 Mercury 650 65hp Outboard

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • '71 Mercury 650 65hp Outboard

    I am wondering if anyone can offer me some advice related to this engine. I have started the engine & it fired right up, ran well, and seems to be in overall good condition. After running it though, there was some oil that leaked out from the propeller area onto the ground, nothing significant, but it was there nonetheless. So, I have a few questions.

    My first question is, is this something I should be concerned about? I believe this is a 2-stroke engine, which confuses me even more that there seems to be oil leaking out of it, since 2-strokes get their oil from the gas/oil mix. This is where some advice would be helpful, as I know nothing about boat engines.

    My second question is regarding the first-time run prep. How should I treat this engine prior to it's first serious run under my ownership? The previous owner admitted that the boat has sat since fall '08 and that the engine hadn't been fired until the day that he posted the ad for it. I'm thinking a total fluids change-out - especially if it really does require oil in addition to the typical 2-stroke fuel mixture.

    My third question is regarding the propeller. There is some damage to the blades and I'm assuming this will have a drastic impact on not only the engine's performance on the water, but also the fuel economy. I'm not expecting miracles in a fuel-sipping engine, but I would think that a fully intact propeller blade would increase the efficiency of the engine by pushing more water with less effort.

    My fourth and final question (for this post at least) is related to long-term care & maintenance. I've never owned a boat before, but I've heard a lot about winterization. While we are just now getting out of the long winter here in Utah, and this question is getting a little ahead of myself, I'm the type of guy who likes to know what he's dealing with & what he needs to do up front. If there's any post-run maintenance I need to do after having it out on the lake, I'd like to know now. Also, do I need to "winterize" this engine? I have heard from some people that outboard engines do not need to be winterized the same way that I/Os do.

    That's it, I'd really appreciate any feedback & advice you may have. Now here's some pics!







    I paid $300 for the boat, trailer, & engine - off an ad that read "65 hp Mercury outboard engine-RUNS GREAT-comes with free boat & trailer!" Thanks again!

    Here's the link to the thread for my '66 Glastron Futura V-150 boat restoration:
    http://forums.iboats.com/showthread.php?t=385991


  • #2
    Re: '71 Mercury 650 65hp Outboard

    So many questions, so little time.... But here goes..

    Originally posted by DrgnRebrn View Post
    I am wondering if anyone can offer me some advice related to this engine. I have started the engine & it fired right up, ran well, and seems to be in overall good condition. After running it though, there was some oil that leaked out from the propeller area onto the ground, nothing significant, but it was there nonetheless. So, I have a few questions.

    My first question is, is this something I should be concerned about? I believe this is a 2-stroke engine, which confuses me even more that there seems to be oil leaking out of it, since 2-strokes get their oil from the gas/oil mix. This is where some advice would be helpful, as I know nothing about boat engines.
    Quite correct, the oil is mixed with the petrol and is 'ingested' by the engine for lubrication of the crankshaft bearings and cylinder walls (and a few other things). That fuel (complete with oil) is drawn into the combustion chamber and burnt. If however, you have a cheap crappy oil that doesn't burn completely, then you end up with a thick, black, sticky mess running down the inside of the exhaust chamber in the driveshaft housing.... Then it comes out the gearbox, like you're seeing.

    Originally posted by DrgnRebrn
    My second question is regarding the first-time run prep. How should I treat this engine prior to it's first serious run under my ownership? The previous owner admitted that the boat has sat since fall '08 and that the engine hadn't been fired until the day that he posted the ad for it. I'm thinking a total fluids change-out - especially if it really does require oil in addition to the typical 2-stroke fuel mixture.
    Been sitting for 2 1/2 years.... It DEFINITELY needs a new water pump impeller (the one that pumps cooling water up from the lake and around the engine to stop it overheating. I'd also change the lower unit/gearbox oil, and spark plugs, and clean out the fuel system. 2 stroke fuel goes off quite quickly, and when it does it rots the inside of everything it touches.

    Originally posted by DrgnRebrn
    My third question is regarding the propeller. There is some damage to the blades and I'm assuming this will have a drastic impact on not only the engine's performance on the water, but also the fuel economy. I'm not expecting miracles in a fuel-sipping engine, but I would think that a fully intact propeller blade would increase the efficiency of the engine by pushing more water with less effort.
    That prop needs replacing/repairing.

    Originally posted by DrgnRebrn
    My fourth and final question (for this post at least) is related to long-term care & maintenance. I've never owned a boat before, but I've heard a lot about winterization. While we are just now getting out of the long winter here in Utah, and this question is getting a little ahead of myself, I'm the type of guy who likes to know what he's dealing with & what he needs to do up front. If there's any post-run maintenance I need to do after having it out on the lake, I'd like to know now. Also, do I need to "winterize" this engine? I have heard from some people that outboard engines do not need to be winterized the same way that I/Os do.
    See below for winterization of an outboard. (from the Merc manual)

    Originally posted by DrgnRebrn
    That's it, I'd really appreciate any feedback & advice you may have. Now here's some pics!
    I paid $300 for the boat, trailer, & engine - off an ad that read "65 hp Mercury outboard engine-RUNS GREAT-comes with free boat & trailer!" Thanks again!

    Here's the link to the thread for my '66 Glastron Futura V-150 boat restoration:
    http://forums.iboats.com/showthread.php?t=385991
    The world takes on a whole new perspective when viewed from 100' below...



    1972 Bertram 'Bahia Mar' 20
    2006 Mercruiser 4.3MPI (0W617679) w/Alpha 1 Gen II (0W829301)
    **
    Please don't send service questions in private messages. That's what the forum is for. Messages of thanks, always accepted.
    **
    Member of the month - April 2013. http://www.iboats.com/blog/achris-member-of-the-month/

    Comment



    • #3
      Re: '71 Mercury 650 65hp Outboard

      Excellent, thank you achris! Do I need to look for a specific prop that fits my engine, or are they somewhat universal? Is the 2-stroke fuel mixture 50/50, and what type of oil should I be using to avoid this from happening again (weight, brand, type, etc)? After I drain the oil from the gearbox, what type should I replace it with? Finally, with this being an older engine, do I need to look for a specialized water pump, and if so, how do I determine what kind?

      Sorry for the onslaught of questions, but I really appreciate the advice!

      Comment



      • #4
        Re: '71 Mercury 650 65hp Outboard

        I have a '71 Merc 800 and it requires 50:1 fuel/oil mix.

        You most likely will want to order a service manual for the outboard if you plan on doing all the maint yourself. Should be a good motor if it was well cared for and you keep up on service.

        I'll have to check out your glastron resto too
        sigpic
        '79 16' Starcraft SuperSport
        12' AeroCraft '55 Johnson 5.5hp
        Starcraft brochures thread

        Comment



        • #5
          Re: '71 Mercury 650 65hp Outboard

          http://www.iboats.com/Mercury-Water-...view_id.271499

          This is a link to water pump kits for your OB from iboats.

          You should replace the lower unit oil with new, also available at iboats.
          sigpic
          '79 16' Starcraft SuperSport
          12' AeroCraft '55 Johnson 5.5hp
          Starcraft brochures thread

          Comment



          • #6
            Re: '71 Mercury 650 65hp Outboard

            Originally posted by DrgnRebrn View Post
            Excellent, thank you achris! Do I need to look for a specific prop that fits my engine, or are they somewhat universal? Is the 2-stroke fuel mixture 50/50, and what type of oil should I be using to avoid this from happening again (weight, brand, type, etc)? After I drain the oil from the gearbox, what type should I replace it with? Finally, with this being an older engine, do I need to look for a specialized water pump, and if so, how do I determine what kind?

            Sorry for the onslaught of questions, but I really appreciate the advice!
            Props are usually specific to a mfr, ie., Merc, OMC, Yamaha etc. There are three specs that are important to match to your motor/boat. They are # of splines on the prop shaft (yours are probably 15), the overall diameter of the prop and lastly, the pitch, or how far the prop would travel in one revolution (theoretical).

            If you look on the back face of your prop around the center hub there should be a series of numbers. The last few digits will describe your pitch, ie., 17P means 17" pitch. The numbers may also be stamped somewhere on the body of the prop.

            50:1 (50 parts gas, 1 part oil) is the correct mixture. Use any name brand MARINE 2 cycle oil rated TC-W2 or W3.

            Again, lower unit oil is MARINE grade SAE 90 extreme pressure (EP) gear oil. Lots of posts here describing how to do it.

            Water pump is a vane type impeller that is driven by the driveshaft inside the waterpump housing. You need to replace at least the impeller with the correct one for your motor. Size of the impeller changes with different models and HP. If in poor condition, you may need to also replace the upper pump housing and other seals. No way of knowing until you get it apart.

            Comment



            • #7
              Re: '71 Mercury 650 65hp Outboard

              Thanks MoodyBlue & HuronAngler! I am trying to figure out which water pump kit is for my engine, but I'm having a hard time finding a serial number anywhere on the engine. Do I need to take the cap off to find this? Also, I guess my engine is a 2 cyl, but I was told by the seller that it was a 4 cyl. To somewhat substantiate what he told me, there is a 4 on the engine housing. Not sure what that means, but if you could share some expertise regarding this it'd be greatly appreciated

              Comment



              • #8
                Re: '71 Mercury 650 65hp Outboard

                The serial # should be on the motor in between the transom clamps. It's usually greasy and dirty so it may need to be wiped down to make out the numbers.

                I believe it's on other parts as well but I haven't dismantled mine yet.
                sigpic
                '79 16' Starcraft SuperSport
                12' AeroCraft '55 Johnson 5.5hp
                Starcraft brochures thread

                Comment



                • #9
                  Re: '71 Mercury 650 65hp Outboard

                  Your motor is a 4 cylinder, 2 cycle motor.

                  Look on the top of the tilt/steering tube between the two transom clamps for the S/N plate. Should be riveted on. The S/N will be 7 digits, something like 2886514. Judging from the coloring on the motor shrouds I would guess your motor is between a 1969 and 1972 model year.

                  Comment



                  • #10
                    Re: '71 Mercury 650 65hp Outboard



                    1970 Glastron V-142 SkiFlite
                    1968 Merc 500 Thunderbolt ign
                    1965 Merc 500

                    Comment



                    • #11
                      Re: '71 Mercury 650 65hp Outboard

                      I have a '73 850 and its very close to yours. If you do have oil leaking out from around the prop-shaft its possibly the inner and outer seals which are located behind the thrust washer on your prop shaft. Seeing the damage to the prop I hope the shaft didn't get bent when the previous owner hit whatever it was that caused the damage. These two seals are about $12 apiece and if you know what your doing you can change them without pulling the carrier housing. If your a novice I recommend paying your local marine service dealer the 2-3 hours they will charge you to replace them. They can also check the shaft when they have it out.
                      The dictionary is the only place that success comes before work.

                      Comment



                      • #12
                        Re: '71 Mercury 650 65hp Outboard

                        That looks nearly identical to the one I'm working on and the reason I got on here! If that prop was run long enough with that chunk out of the blade, it throws the thing out of balance which can cause wobble in the shaft and make the bearings go out and could cause the seals to leak. Good luck with it- I will be posting more on my motor as well, which may eventually be helpful to you and vice versa.

                        Comment



                        • #13
                          Re: '71 Mercury 650 65hp Outboard

                          I too have a 73' 850 and have been working on it all winter. Be sure to check all of the wiring on your motor, I had to replace the internal harness ($110) on mine due to corrosion, apparently common to these older merc's. Also, be careful around that distributor, no longer available to buy.

                          Comment



                          • #14
                            Re: '71 Mercury 650 65hp Outboard

                            DrgnRebrn

                            if you look up my older posts you may find some good info on your engine and what to fix .. my best suggestion is buy a MERCURY manual dont bother with the cheaper ones they have most of the info but it gets confusing looking for YOUR engine details amidst all the models cheap books cover. As Achris will atest to i have the same engine as most of you in here and i have been workig on it all winter .
                            mine is a 1970 650 4cyl.
                            good luck

                            road

                            Comment



                            • #15
                              Re: '71 Mercury 650 65hp Outboard

                              Wow, thanks for all the advice everyone! This place is great! I hope I'm not getting into something too extensive. I have worked on car engines before, older and newer. I have even helped my dad & brother rebuild a couple of them, but I've never touched or even seen a boat engine. I know that they should be somewhat similar, but I also know that they are most likely very different in several ways. I wouldn't be surprised if the seals down by the prop are bad. Just the fact that the engine sat for 1 1/2 years without having been run could dry out seals and cause leaking to occur. The strange thing is though that it only leaks when the engine is on, is that significant?

                              egclassic - Thanks for the FYI. I am planning on doing a full tune-up & that will include inspecting the wiring & connection points.

                              Wingedwheel - I'm going to go ahead & get a Mercury manual & take a shot at taking the prop apart & replacing anything that needs to be replaced. I think that I could get her figured out with a good manual, which brings up the question - where do I find one for this year engine? Are they hard to come by, or is it something like Chilton's manuals for car engines where you can still easily find them for older engines?

                              Aqualift - Thanks for the pics on locating the serial number, those are very helpful!

                              Moody Blue - Thanks for the clarification on the 4 cyl vs 2 cyl question!

                              bayoulee - I'll be sure to check out your thread, as well as keep mine updated with as many pics and, hopefully, vids documenting my progress.

                              I hope I covered everyone who's responded so far. I really can't thank you each enough for the advice. This site truly is a great resource. I'm a total newbie with boats, but I already feel like I am gaining a sense and familiarity with the language, care, & pride in owning & working on them.

                              Comment

                              Working...
                              X