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    Johnson 150 Rebuild/Remanufacture Guidance

    If I decide to tear into this myself, is there a rebuild kit supplier you would recommend purchasing from for quality parts/components? Possibly a supplier that would be willing to answer occasional questions along the way? Can you suggest a shop that focuses on outboard powerhead machining? I...
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    Johnson 150 Rebuild/Remanufacture Guidance

    I need some rebuild/remanufacture guidance for a 1986 Johnson 150 HP crossflow engine I own. The model number is J150TXCDC. I have owned this boat (1986 Boston Whaler Outrage) and motor set up since 2003. The engine has over 1,200 known hours on it. It has one slightly scored cylinder...
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    1986 Johnson 150 HP, Model J150TXCDC Spark Plugs

    My OMC Service Manual recommends Champion Spark Plug QUL77V with the alternate being UL77V. What is the correct plug for this engine? I have been running the Champion UL77V surface gap plugs over the years. My use varies between trolling and running around at 3,000 to 3500 RPMs, not at high...
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    Fuel Leak around Carburetor Bank on 1986 Johnson 150 HP Outboard with VRO

    I have a fuel leak that seems to be at it's worse after I turn off the engine. I am having a difficult time identifying the source of the leak. It seems to be coming from the carburetor bank and related fuel and recirc hoses. I rebuilt the carbs approximately 4 years ago and the engine runs...
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    1986 Johnson 150 (J150TXCDC) Fuel & Oil Recirculation Line Clamps

    I am experiencing a “slow drip” gas & oil leak in front of the carburetor bank on this engine. I can’t easily detect the source, but want to improve the hose clamp situation. Currently, the clamp usage adheres to the OEM Diagrams. It is a mix of BRP Snap Clamps and BRP Cable Tie Clamps...
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    OMC Temperature Switch Removal 1986 Johnson 150HP

    Johnson 150 HP, 1986, Model: J150TXCDC 1. How do I remove the Cylinder Head Temperature Switches from each head? They are functional, but I want to remover them to have my head milled flat. I removed the head cover, and loosened broke the rubber grommet free with PB Blaster, but I am unable...
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    Removing Cylinder Head Bolts and Cover Bolts on a 1986 Johnson 150 HP (J150TXCDC)

    After additional research on this site I believe my cooling system deflectors may be causing an overheating condition. I am now getting an overheat warning only when I run over 4,000 RPM. I replaced the water pump, thermostats, pressure release valve, and springs, two years ago, and believe...
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    1986 Johnson 150 V6 Cooling & Cylinder Head Temperature Model #J150TXCDC

    I installed a new water pump kit, new thermostats, new pressure relief valves, and related seals. I did not replace the pressure release valve seat. I fired the motor up on the trailer at a local ramp, but I can?t run in the shallow water at this location. I now have a strong telltale and 6...
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    1986 Johnson 150 V6 Thermostat Replacement

    One side of my engine is running cool. My diagnosis is that the thermostat must be stuck wide open. Am I missing any other root causes? Reviewing my OEM service manual for thermostat service, it seems to be a relatively simple replacement operation. My question is, "is it necessary to...
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    1986 Johnson 150 Hose Routing Diagram Needed

    I haver a "CD" sevice manual (P/N 507547 for my 1986 Johnson 150 (model #J150TXCDC), but I can't find the correct hose routing guide in it. I am specifically in need of the recirculation hose routing guide. Between each carb there are three recirc nipples/barbs and two additional nipples/barbs...
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    Carburetor Float Adjustment 1986 Johnson 150 HP

    I installed the inlet needle, float, and hinge pin, and then inverted the carbureator body. My service manual says, with the float closed, the top edge of the float should be between but not touching the two notches on my OMC float gauge. I actually have the float gauge. My question is, do I...
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    Carburetor Cleaning for Rebuild & Related Questions

    I purchased 3 carburetor rebuild kits to rebuild the carburetors on my 1986 Johnson 150 HP outboard. This is mainly for preventive maintenance, but I did seem to experience gas leakage out of one of the carbs last summer and some occasional flooding. Hec, possibly I have old cork floats or...
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    Johnson/Evinrude Cold Start vs Warm Start Procedures

    The FAQ "Johnson/Evinrude Cold Start Procedures" is a great reference for cold starting my 1986 Johnson 150. The question I have is, when do you not use the primer bulb or the electronic primer solenoid when starting the engine. For example, would a four hour stop at an anchorage/sandbar...
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    1986 Johnson 150 V-6 Hard Start with Flooding

    The subject engine has been running great and still runs fine after started. In addition, I am confident I know how to cold start this engine, and my procedure seems to mirror those described on this site. However, recently I noticed a change in the primer bulb when prepping the engine for...
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    1986 Johnson 150 HP Loss of Top End RPM’s

    Engine is a 1986 Johnson 150 HP outboard. The motor is on a 1986 Boston Whaler Outrage 18.<br /><br />The problem I encountered, on my initial shakedown run last season, was an occasional loss of power when accelerating. For example, on occasion the RPM’S would drop off dramatically upon...
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