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  1. cgrooves

    Impeller Related Question

    I promise I've searched through this site (and others), but am still in need of clarification. I have a 1979 boat with a Mercruiser 898 (GM 305) engine and a Mercruiser 898 (MC-I) sterndrive (SN: 5429261). I also have Mercruiser Service Manuals #3 & #4. I know that the cooling system has...
  2. cgrooves

    Comprop Report: 190 hp I/O

    I was running a 3 blade aluminum prop with a 21" pitch (unkown diameter) on my 18' bowrider with 190 hp. Top end was good but boat was slow to get on plane. I was hitting my max RPM (4,200) at WOT, with a top end speed of approx. 44 mph. I recently purchased one of the cheap composite props...
  3. cgrooves

    Checking Distributor Advance

    For starters: Mercruiser 898 (305) engine with mallory distributor. New points, condensor, rotor, cap, etc. this year. My timing light does not check total advance like some apparently do. On a couple of occassions recently, I've heard some odd sounds (low volume popping type sounds) that...
  4. cgrooves

    Engine exhaust routing question

    For starters: Mercruiser 898 (305) engine with a Mercruiser 898 (Gen I) Outdrive. Exhaust goes out the prop hub (closed system?) Question: I installed a new prop yesterday and was back at the stern looking over at the outdrive while my wife was driving and noticed some exhaust gas coming out...
  5. cgrooves

    Impeller operation question

    I attempted a brief search to no avail. Sorry if this has been answered a million times. This is my first season with an I/O, so I'm just learning. What 'drives' a raw water impeller in the outdrive? (i.e. Is it gear driven?) I had thought that perhaps it was driven by the suction created...
  6. cgrooves

    OMC / Mercruiser Interchangable?

    What is the difference between a 15 tooth, 4.5" hub OMC prop that does not allow you to use it on a 15 tooth, 4.5" Mercruiser outdrive? Thanks.
  7. cgrooves

    Choke valve position? Carb experts enter

    Specifically talking about a Rochester 2GC, although the general question may apply to all carbs with an electric choke. I recently rebuilt the carb and was looking down the throat of the carb last weekend to watch how quickly the choke was unloading. The choke adjustment is set at the middle...
  8. cgrooves

    Bearing Size Question

    I'm in the process of doing a bearing change on my single axle trailer. I pulled out the bearings on one side and took them to the local Napa auto parts store to ensure I got the correct size. My hubs have a larger inner bearing than the outer bearing. Based on the actual bearings that came...
  9. cgrooves

    Explanation of Anti-Siphon Valve?

    I asked this question in another thread, but rather than thread-jack, I figured I should start my own. "If the anti-siphon valve is a 1-way valve, I assume it will allow fuel to flow in the direction 'from the tank to the fuel pump'. In the event of a fuel line failure between the anti-siphon...
  10. cgrooves

    Shifting Gremlin! Need advise

    The background info: 1979 Starcraft with a Mercruiser 898 (305) and a Mercriuser 898 (Pre-Alpha) outdrive. Symptom: Boat would only shift into forward (going into / out of neutral was fine). It would not shift into reverse (would grind & the RPM's would start increasing). Treatment: Marine...
  11. cgrooves

    OEM exhaust manifold vs. aftermarket

    What's the general concensus of using aftermarket exhaust manifold systems (i.e. Osco) instead of OEM (i.e. Mercruiser), as far as cost & availability being a factor? I've noticed that on the particular application I have in mind, the 'generic' Osco manifolds have the risers in the center while...
  12. cgrooves

    Service Manual Question

    Sorry for the newbie question. How do the SELOC service manuals compare with the genuine Mercruiser service manuals?
  13. cgrooves

    Another "Won't Shift Into Reverse" Thread

    For starters: 305 V8 engine coupled with a Mercruiser Pre-Alpha Outdrive (Mercruiser 898, to be specific). Symptom: Boat would not shift from neutral into reverse. It would try to engage, but you could hear gears start grinding and if you pulled the lever back further the RPM's would start...
  14. cgrooves

    Opinions Needed on Purchase / Repair

    I'm considering buying a boat from a family member. 1979 model bowrider with a Mercruiser 5.0L and a Mercruiser (#1) outdrive. Boat is in good physical shape, and appears to have been well cared for. A gimball ring kit was recently installed due to horizontal slop. A new impeller and trim...
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