Recent content by cvlngineer

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    Need a part number please

    I need a part number for the top motor mounts on a 1975 and a 1978 Johnson 70 hp<br /><br />I think that the chassis is a 1978, but I am not absolutely sure. I believe that the part is the same for both years, but would like to verify.<br /><br />Thanks<br />cvlngineer
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    Help......Update on 1975 Johnson 70 hp

    Hello,<br /><br />The motor runs A LOT better. It does not bog down, and I can drive on the trailer somewhat easily. Here is what I did:<br /><br />I got a new (used) set of carbs and rebuilt and installed them, along with the #2 coil, which was the only one that I hadn't changed. The motor...
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    Lower unit question

    Hello,<br /><br />I am just curious about what gear ratio I have in my lower unit. It is on a 1975 Johnson 70 hp motor. The lower unit may be from a 1978, though. The gear ratios are probably the same, right? If anyone has these ratios, I would appreciate it.<br /><br />Thanks,<br />cvlngineer
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    1975 Johnson 70 hp Top Main Bearing

    Hello,<br /><br />I went out and put the required 2 hours of low, varied rpm boredom for break-in after rebuilding this motor. I noticed a slight whining coming from under the flywheel. In the rebuild kit that I got, the top main bearing, and the two center main bearings were not included, so...
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    ATTN: Joe Reeves (Timing Rod???)

    Joe,<br /><br />I have another question for you. I adjusted the cam on the throttle yoke, so that I would have the 4 31/32" length between the yoke and the throttle rod base. With the pickup timing set and held in place with the idle adjustment screw, the cam was advanced too far forward, to...
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    1975 Johnson 70 hp .......... new information

    I took the boat out yesterday and it did better, but there was still some bogging.<br /><br />In forward gear...<br /><br />The motor ran fine from idle up to 1600 rpm. Slowly adding more throttle bogged the engine, and it died at 1650-1700 rpm. If I gave it throttle quickly, most of the time...
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    Timing Cam on 1975 Johnson 70 hp

    Could someone please post or send me a picture of what the OEM cam and cam follower (roller) assembly is supposed to look like for this motor? I just want to make certain that I have the correct one on here.<br /><br />address is smithcharlesw at hotmail dot com<br /><br />Thanks in advance,<br...
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    Re-torquing head bolts

    Hello,<br /><br />I need to re-torque the head bolts on my 1975 Johnson 70 hp. I know that you have to loosen them a little, and then retorque, but do I loosen all of them before retightening, or loosen and retighten them one at a time?<br /><br />cvlngineer
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    Carb jet sizes

    Could someone please post the proper carb jet sizes for a 1975 70 hp Johnson?<br /><br />Thank You,<br />cvlngineer
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    Bore diameters, piston diameters and ring gaps

    Here are the dimensions that I just took from the powerhead and pistons on my 1975 Johnson 70 hp headache:<br /><br /> <br /><br />As you can tell, my #2 piston has some scoring on it. I have alread had the cylinders honed. I am getting ready to order some parts.<br /><br />The cylinders look...
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    Piston-Cylinder tolerances

    The manual I have does not mention anything (that I have found) about the tolerance of the clearance between the piston and the cylinder wall. Could someone please post this information?<br /><br />The motor is a 1975 Johnson 70 hp (inline 3 cylinder engine)<br /><br />Thanks,<br />cvlngineer
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    Clymer or Seloc???

    Which of these two manuals would be better for this powerhead rebuild?<br /><br />I am heading to town to pick one up, so I can quit pestering you fine folks.<br /><br />Thanks,<br />cvlngineer
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    Problem with piston rings?

    I have only removed the head so far, but there is a small amount of side to side play on the pistons. There is only a little, like the rings are sliding in their grooves on the piston head. What does this mean, new rings?<br /><br />Thanks,<br />cvlngineer
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    Do I have to pull the flywheel?????

    Will I have to remove the flywheel to get to the wristpins, or can I just open the crankshaft case with it still on?<br /><br />Thanks,<br />cvlngineer
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    one head bolt is stuck

    Are there any tricks to get it out without breaking it off??<br /><br />cvlngineer
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