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  1. K

    Likely cause of compression loss in cylinder 1

    Also could be a broken valve spring or the rocker arm stud pulled out on account of a stuck valve.
  2. K

    Cracked Block???

    They usually crack first under the intake manifold. That is the thinnest part of the block. That freeze has probably broken a lot of marine engines.
  3. K

    Any Other Ways To Solve Bravoitis?

    There was a discussion on the Donzi site and the consensus was to plumb through the bottom of the hull and use a “Y” connection to to join the incoming water from the drive and the through hull to the pump, end of problem.
  4. K

    3.7l 190 4bbl carb question.

    Just make sure the timing is set and it also would be a good time to convert to a Petronics ignition. Depending on how you are going to use the boat can determine the best propeller. The main thing is you want to get the max rated rpm. Is the hull in good condition and not water logged and how...
  5. K

    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    All GM truck engines have the extended “ear” on the starboard side which is used for the front engine mount. I have seen auto style engines in boats where a bracket was fabbed up. These engines are getting harder to find and if you cannot locate a truck engine then with some work a bracket...
  6. K

    aq171

    Volvo and maybe some aftermarket suppliers provide yellow stripes on the belt to help Aline the timing marks on the respective sprockets. There is a small hole on the tensioning rod you put a small rod through that keeps the spring compressed on the tension pulley bracket to make it easy to...
  7. K

    3.7l 190 4bbl carb question.

    2Xs with AD. However unless you have a way of measuring o2 then changing jets, rods and the power valve spring will be a shot in the dark. The main thing is that the engine is in good condition and the boat has the correct propeller and the secondary air valve is opening all the way a WOT. And...
  8. K

    aq171

    You need to get the correct Volvo service manual first. There is a possibility that there is a problem with the tensioner pulley.
  9. K

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    You better look inside of that carburetor, I bet it is not in good condition. I suggest you rebuild the original one.
  10. K

    74 omc 190 engine zincs location

    The only zink on your OMC is the #982277 which is located below the intermediate housing exhaust . This zink is on the website that AD suggested. If this is a trailered fresh water boat then it is probably all you need. You can add some small ones to the cavitation plate by just drilling some...
  11. K

    No electric getting to engine

    Just for kicks first check the yellow/red wires coming out of the control box then check the same wire on the small relay near the starter. Those relays are known to fail. A test light is probably all you need to check these circuits.
  12. K

    460 King Cobra oil pump

    It may be that the pieces of metal from the worn cam are stuck in the oil pump screen. Make sure to always add the zink additive supplement to the oil at every oil change or you will be getting real good at replacing the cam.
  13. K

    Planing and then stalling out

    Remove the suction tube from the fuel tank, inside the tube there may be a small screen filter about 1” long. You will have to unscrew the tube from the 90* elbow and push a small rod through the tube to remove it. Also as A-D said the anti siphon can also cause the same problem be sure to...
  14. K

    120hp OMC model number

    Just loosen the drain screws about 3/4 of a turn to be sure. If clean oil starts to seep out you should be in good shape.
  15. K

    Will it work??

    At least people on the site know how to mate an AQ together now.
  16. K

    120hp OMC model number

    Try to loosen the drain screw on the upper gear housing, do not be surprised if water comes out before the oil. The lower gear housing hopefully will not have water. The missing part of the fin can be repaired at a aluminum welding shop. All the solenoids on the engine are marine specific so...
  17. K

    Will it work??

    If this is a genuine Volvo AQ model and you are mating the lower to the mid section you will need a depth micrometer to measure the height of the bearing cup on the lower and the cavity that it fits into. And as previously stated be sure to use a new “O” ring for the water passage and the other...
  18. K

    120hp OMC model number

    Try to post some pictures of the engine and drive.
  19. K

    Intermediate bearing?

    My bad on that one, I just cannot seem to get the AQs out of my brain!
  20. K

    Intermediate bearing?

    V8 Volvos have 2 bearings and to replace the front one the engine has to come out. They are generic bearings and can be obtained from any bearing supply house or even NAPA. The worse thing that could happen will be the shaft rusted to the flex plate on the flywheel which will prevent the...
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