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  1. UNSUREBOATGUY

    1987 Mercriuser 3.0L Ran out of gas?

    After a great day out on the water, our boat started to sputter a bit while pulling two tubes around the lake (big turns, lots of lean, etc.) like it was running out of gas. Leveled the boat out and it ran fine again. Parked for a bit, warned the folks we were out on the lake with that we...
  2. UNSUREBOATGUY

    Mercarb Throttle Lever question

    Took the boat out yesterday for the first time after rebuilding the carb. Everything worked great :) Dialed in the idle mixture and speed per the manual and managed to break off the threaded part of the stud on the throttle lever when reattaching the throttle cable. :mad: I'm guessing it has...
  3. UNSUREBOATGUY

    Mercarb Rebuild Float Drop Question

    I'm finishing up a rebuild on my mercarb # 1389-9562 (87 3.0 S/N below in signature) and have a question on the float settings. I was following the procedure in Mercruiser Service Manual #10, and the float level matches the instruction sheet that came with the rebuild kit, but the Float Drop is...
  4. UNSUREBOATGUY

    How do you know if it's time to rebuild the carb?

    Hello gents, I'm sorry if this has been covered. 1987 Mercruiser 3.0 Alpha 1 with the Mercarb # 1389-9562. The engine starts fine cold, idles well once warmed up and runs well up to WOT on the lake with no problem. Occasionally there is some hesitation when I hit the throttle hard from a...
  5. UNSUREBOATGUY

    Mercruiser 3.0 starter bolts

    Hey guys, this may seem like a dumb question, but in my searching online I could not find a clear answer. I want to replace the starter mounting bolts on my 1987 Mercruiser 3.0 s/n 0B515153, but I can't find exactly what bolts I need. There are slight variations in lengths. If you could send...
  6. UNSUREBOATGUY

    Alpha 1 input shaft seal replacement-trouble getting 15/16" nut off yoke

    I've got the assembly pulled out of the drive (gears look like new-I'm shocked and very pleased-its an '87) and have started disassembly. I have the setup sitting in the retainer nut wrench and stuck a screwdriver in the u-joints like it shows in the manual. I'm having a difficult time...
  7. UNSUREBOATGUY

    2 questions-preparing to fix oil seals on alpha

    1987 3.0 Alpha 1 I'm getting together tools, parts, etc. to replace the input shaft seal and find the source of some minimal water intrusion to the drive lube. 1987 Alpha-will I likely have the small spacer in the bearing assembly, or will I have to worry about rolling torque? As far as the...
  8. UNSUREBOATGUY

    1987 Mercruiser 3.0 Weird noise-what is it?

    1987 Mercruiser 3.0 with alpha 1. Weird noise that I can't seem to figure out. I'm no boat or engine expert so please go easy on me. It usually only appears between about 1400 rpm and 2500-2800 rpm. It usually goes away at idle, though it didn't for this video for some reason. The engine...
  9. UNSUREBOATGUY

    Exhaust Shutter disintegrated? grommets?

    1987 Mercruiser 3.0 Alpha 1 I ordered a new exhaust shutter because I was hearing an intermittent metallic noise towards the aft of the engine that comes and goes with different RPMs. After doing some searching and reading-seemed to be a reasonable guess as to what was making the noise. I was...
  10. UNSUREBOATGUY

    Trim Pump Troubleshooting-please help

    1987 Mercruiser 3.0 Alpha 1 The leg is dropping very slowly when the boat is parked. I walked by the boat the other day and noticed that the skeg was touching the garage floor. I know when I parked it, it was a little off the floor. I raised it a little yesterday and placed a piece of wood...
  11. UNSUREBOATGUY

    New Alternator-Wiring Question

    1987 Mercruiser 3.0 Alpha 1 Just picked up a new alternator for the boat. Its a Sierra 18-5951 3 wire alternator. My question has to do with how to wire it up to the engine. The Orange and black wires are self explainatory, but which wires do I hook up to the red/purple and purple wires...
  12. UNSUREBOATGUY

    First Time Alignment Problems

    1987 Mercruiser 3.0, Alpha 1 I just picked up my alignment bar today and checked the alignment on the boat after replacing the gimble bearing, bellows and u-joints. I'm pretty sure I have the height of the engine pretty close, but the bar is still difficult to insert/remove. The grease...
  13. UNSUREBOATGUY

    Replacing U-joints-Advice?

    Hey guys, 1987 3.0L Alpha 1. I'm trying to replace the cross bearings in my U-joints-they were rusted-bad bellows. They are pretty stuck. Any advice on how to get them out? I removed the c clips, sprayed down with penetrating oil and am trying to press them out with a big c-clamp with a big...
  14. UNSUREBOATGUY

    1987 3.0 Mercruiser Tach Question

    Hey guys, I'm sorry if this has been covered in another thread, but I was not able to find it. I have a 1987 3.0 Mercruiser with a Medallion A4550 Tach. 1. Does anyone know what it should be set at? The options are 1, 2, 3, 4 2. Is there an easy way to tell if the tach is bad just by...
  15. UNSUREBOATGUY

    Replace alternator? (automotive)

    I'm pretty sure I already know the answer to this, but the yahoo that had sold me the boat ('87 Four Winns 160 Freedom with 3.0 Mercruiser) installed a new reconditioned alternator (7127M-3) shortly before he sold it. Well, the alternator is an automotive alternator-not marine. How important...
  16. UNSUREBOATGUY

    Rough idle when cold-any suggestions?

    1987 3.0 Mercruiser-the motor starts ok, but idles rough and runs rough at low RPMs. The idle smooths out a lot once the motor is warm. Any suggestions for what to look at first? Seems to run just fine at higher RPMs. The plugs say it is running rich. Thank you.
  17. UNSUREBOATGUY

    Water in Oil?-Now What?

    Hello, I just bought a 1987 four winns 160 freedom with 3.0 Mercruiser yesterday. I'm pretty sure there is water in the oil. Is there an easy way to be sure? I changed the oil to try to find out-it came out thin (granted, it was warm, but I think thinner than it should be), and more drained...
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