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  1. J

    Water Pump Seal - 26-38970

    Hello, 1988 Mercury 175 No EFI Replaced my impellar yesterday, the water tube came out with the lower unit, attached/ inside the water tube guide. I pushed the water tube back up into the head and installed the lower unit. Looking at some diagrams, I did not see the water guide seal, Part#...
  2. J

    Constant Alarm - 1988 175 Mercury

    Hello, I spent the weekend reading a lot of the oil/tempature alarms here, good information. I read my Seloc manual, but I am still having problems identifying what is the temp sensor, and what do disconnect to isloate the alarm problem. Problem: Constant solid alarm when key is turned, with...
  3. J

    How do I read Mercury prop numbers

    Hello, I would like to replace my propeller on my 1988 Mercury 175. Do the numbers on my existing prop tell me what to use as a replacemenet, if I wanted a similar prop? Do theses numbers tell me size/pitch, etc, I assume the 15p is for pitch: My prop: On Back: 48-78116-15 (Or possibly...
  4. J

    Mercury 175 - 1988 - Stator AMP 15 or 16?

    Hello, Replaced my stator on my 1988 Mercury 175 last year, it works great but about 3 to 5 times a day, at idle/headway, the tac jumps and bounces at 5000 to 6000 rpm, but motor is still running at 1600/1800 rpm, I have not touched throttle, but tack and motor thinks it is running at 5000 RPM...
  5. J

    Serial Number - Mercury 175

    Hello, I need to order a part for my 175 Mercury, but looking at the listing of parts to serial number, I cannot locate mine in the ranges. The SN on my engine is a bit faded, is it possible to look up a SN to see if it is valid, I may be reading it incorrectly. My SN: OB931933 Thanks
  6. J

    Tilt Broke - 88 Yamaha 200

    Hello, My tilt just broke on 1 of my twin 1988 Yamaha 200's. I was out the other day, tilt did not work, got to the dock it worked, put boat on mooring did not work, flaky, has not worked since. I just get a click noise on the engine where the wires go from the tilt motor. I think I can...
  7. J

    1988 - 175 Mercury - Tune Up Question

    Hello, What parts can I replace to do a tune-up on my Mercury. I replace the plugs every year but last year it was running a little rough at idle and headway/slow speed, stalling, etc. I assume it is spark related, because when I smash the gas on this thing she goes flat out and runs great...
  8. J

    1988 175 Mercury - Stiff Steering

    Hello, last season my 1988 Mercury 175 outboard was very tough to steer. I took off the steering cable and manually moved the engine left to right and it is very stiff. I greased all the fittings I could find and worked the engine back and forth manually to free it up. It got a bit better...
  9. J

    Starter Not Engaging Consistantly - 1988 Mercury 175

    Hello, This year I am having problems with my starter not consistantly engaging. I have sprayed the top with some lube, but did not help. About the 4th or 5th try turning the key it engages, the first 3 or 4 times the stater spins but does not lift up to the fly wheel, just spins, you can...
  10. J

    Aluminum to Stainless - Size - Mercury 175

    Hello,<br /><br />I have a 175hp Mercury outboard on a 21 foot Grady Wihte, Overnighter. The existing aluminum prop I have works good on the boat, but I would like to move to a stainless.<br /><br />The existing prop is: 48 78115 15P<br /><br />PROP NO. 48-78116-15<br /> RPT NO. 15R11<br />...
  11. J

    1988 Mercury 175 - Skips Under Load

    Hello,<br /><br />I have a 1988 Mercury 175 on a 1986 Grady white Overnighter 208, 20'.<br /><br />When trolling or full throttle it runs great.<br /><br />When getting up to plain slowly or holding the boat at bow up before plaining when the engine is under heavy load it skips and does not...
  12. J

    1988 Mercury 175 - Running Tempature

    What is the maximum temperature a 1988 Mercury 175 outboard should get to without it being a concern?<br /><br />Or what is the max temperature it should not go over?<br /><br /><br />I just installed a new temperature gauge, one with numbers, on my boat. The old temperature gauge just had a...
  13. J

    Engine Misses at 3000 RPM

    1987 Volvo 230 surges at 3000 RPM in rough water. Appears to run O.K. in calm water. Sould I rebuild carburetor, install new fuel pump or both.<br /><br />What would cause this to happen only in rough water at high RPM, carburetor floats?<br /><br />Thanks.
  14. J

    1986 Volvo Penta 235 I/O - No RPM over 3000

    My neighbors port side Volvo Penta 235 I/O engine will not go over 3000 RPM. The boat was in storage for the winter, and was put in the water last week. When we got to 3000 RPM and hit some choppy water, the port engine would go from 3000 rpm to 2000 rpm, to 1500 rpm back to 2000 rpm and back...
  15. J

    Alarm - Behind Gauges

    I have a 1984 Grady White Overnighter. When I started the boat yesterday, there was an alarm/horn going off behnid the gauges. I looked under the dash, but cannot see the horn?<br /><br />What is the horn/alarm device behind the dashboard alert you of, overheating, Oil Injection alarm?<br /><br...
  16. J

    Alarm - 1988 Mercury 175 Outboard

    I have a 1984 Grady White Overnighter. When I started the boat yesterday, there was an alarm/horn going off behnid the gauges. I looked under the dash, but cannot see the horn?<br /><br />What is the horn/alarm device behind the dashboard alert you of, overheating, Oil Injection alarm?<br...
  17. J

    Alarm - 1988 Mercury 175 Outboard

    I have a 1984 Grady White Overnighter. When I started the boat yesterday, there was an alarm/horn going off behnid the gauges. I looked under the dash, but cannot see the horn?<br /><br />What is the horn/alarm device behind the dashboard alert you of, overheating, Oil Injection alarm?<br...
  18. J

    1988 Mercury 175 - Running Tempature

    I have a 1988 Mercury 175 outboard that appears to slowly heat up at headway speed, when you just click into forwared and stay at that speed for 10/15 minutes. It appears to top out at a little under the 3/4 mark on the temp gauge, no numbers on the temp gauge. Whe I get the RPM up to 1800...
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