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nothing but oil in the coolant pump

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    nothing but oil in the coolant pump

    I'm in the process of stripping down a hawk and I got a little surprise when I went to drain the coolant. I popped the bolt out of the water pump and about a half cup or so of oil drained out. No coolant. I opened up the pump and there was a little trace oil in it but definitely no water in it or the whole system. I drained the engine oil and there was no milkshake either. The previous owner sent me video of it running (but not well). but who is to say it did or did not have coolant. The guy really had no idea what he was doing so kind of hard to say. I know there has been some damage to the radiator from a fall or something so i can understand if maybe it had a leak and emptied out but I didn't expect oil to come out. Is that perhaps an indicator a seal is gone inside the pump? I would think if so then there would be milkshake in the motor? I can spin the motor over with a ratchet and socket and it has compression with the plugs in. Essetnially nothing feels seized. I didn't really think to do a compression test before I started taking it apart but I'll probably do that later in the week when time permits, but just curious for any suggestions to see what anyone can offer up as an explanation for the oil dump in the coolant pump.
    88 Blue Hawk GT - Under construction but rideable (guest approved)
    89 BlackHawk 2.0 - On the lift and being assembled
    90 Hawk GT (color as to yet be determined) - Still on the shelf in crates

    #2
    My first thought was, did the previous owner knowing there was oil getting into the pump via a leaking oil seal drop the old contaminated oil and coolant then fill up with fresh oil.

    It's easy to clean the mayonnaise off the filler cap and dipstick. Have a look inside the oil filter.

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      #3
      The oil is definitely old and gassy smelling. That’s A good thought to check the oil filter though I’ll do that this evening
      88 Blue Hawk GT - Under construction but rideable (guest approved)
      89 BlackHawk 2.0 - On the lift and being assembled
      90 Hawk GT (color as to yet be determined) - Still on the shelf in crates

      Comment


        #4
        What bolt? There are 4 that hold the pump on then one more that holds the line. Did you pull the pipe out?

        I'd pull the whole cooling system at that point.. flush it well.mm
        Don't spend money and buy, spend time and learn.

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          #5
          I took out the coolant drain bolt initially. It has a little sideways triangle next to it on the pump cover. Regardless of that I pulled the whole pump cover off eventually, radiator and all the bits. Like I said, it’s a tear down to clean and remove some corrosion. There was definitely No coolant in the system, just some oil. Was weird as hell. I’m going to pull a plug in each cylinder and check compression before I take the motor out of the frame and like suggested earlier inspect the oil filter for milkshake. If I don’t find any I’ll probably go ahead and see if I can manage to service the water pump and am probably going to test the waters on one of those eBay aluminum radiators. I think someone posted the parts on rebuilding the pump not too long ago so will dig into that a little. lol
          88 Blue Hawk GT - Under construction but rideable (guest approved)
          89 BlackHawk 2.0 - On the lift and being assembled
          90 Hawk GT (color as to yet be determined) - Still on the shelf in crates

          Comment


            #6
            Maybe just fill the cooling system with oil and have the first oil cooled Hawk giphy.gif
            "Hawk Porn" http://picasaweb.google.com/11124379...eat=directlink 1990 NT650-Penske 8981, Race-tech Springs & Gold Valves, Steve Lenac six-piston caliper & EBC rotor,SS Brake lines Ft / Rear lines through SSA ,VFR brake lever, F2 front wheel, F-120/70 R-160/60 Dunlop Roadsmart, Full-Supertrapp Exhaust, Stage 1 Jet kit, K&N Filter, Corbin Seat, Pro-Tec Clip-On's/ Past Rides...1986 VFR700F2 Interceptor / 1979 Yamaha Rd400 Daytona Special

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              #7
              It's a strange one.

              Only thing I could think of is if there was never any coolant in there and the oil somehow made it's way past the seal in the pump and was slowly leaking from the crank case into the water pump from the impeller seal.

              ​​​​​​​Having not had a hawk water pump apart that I can remember if they are even a serviceable part, I'm not sure how it seals around the impeller shaft.

              Don't spend money and buy, spend time and learn.

              Comment


                #8
                If the oil seal fails, the oil should drain out the weep hole in the pump, not go into the cooling system. Pretty weird.
                J.D. Hord
                Keeper of Engine Nomenclature, 9th Order

                Comment


                  #9
                  Yeah I was thinking along the lines of what 6 was saying, while at the same time thinking that if the bike got hot enough while running without coolant maybe the seal in the water pump failed enough for oil to seep in (no telling wtf else may be destroyed but the motor seems to outwardly be OK. I'll do a compression test on Saturday and probably take a close look at the water pump and see what I can see. I just ran out of time this past weekend to dig deeper and figured I would consult the brain trust!

                  Thanks fellas!
                  88 Blue Hawk GT - Under construction but rideable (guest approved)
                  89 BlackHawk 2.0 - On the lift and being assembled
                  90 Hawk GT (color as to yet be determined) - Still on the shelf in crates

                  Comment


                    #10
                    I'm wondering if the guy was just trying to make a quick sale. Had no coolant to fill it with and threw some oil in instead just so he could say it was running.
                    Brian - Richland, WA
                    1991 Hawk GT
                    1997 VFR

                    Comment


                      #11
                      Originally Posted by bk94si View Post
                      I'm wondering if the guy was just trying to make a quick sale. Had no coolant to fill it with and threw some oil in instead just so he could say it was running.
                      Possible. Or maybe it's a case of complete mechanical ineptitude. I once helped someone bleed their brakes after they filled the MC with the diaphragm in place and couldn't understand why the brake system did nothing but suck in air.
                      ASMA #139

                      Comment


                        #12
                        Originally Posted by bk94si View Post
                        I'm wondering if the guy was just trying to make a quick sale. Had no coolant to fill it with and threw some oil in instead just so he could say it was running.
                        a hawk would run fine without any coolant........for a few minutes.
                        "It's only getting worse."


                        MY rides: '97 VFR750, '90 Red Hawk, '88 Blue/Black Hawk, '86 RWB VFR700 (3), '86 Yamaha Radian, '90 VTR250, '89 VTR250 (2), '73 CB125, '66 Yamaha YL-1

                        Sold: '86 FJ1200, '92 ZX-7, '90 Radian, '73 CB750, '89 all-white Hawk, '88 blue Hawk, '86 FZ600, '86 Yam Fazer 700 , '89 VTR250, '87 VFR700F2, '86 VFR700F.

                        Comment


                          #13
                          Originally Posted by squirrelman View Post

                          a hawk would run fine without any coolant........for a few minutes.
                          Better than with oil in there.
                          Don't spend money and buy, spend time and learn.

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