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  1. thumpar

    2 solenoid, 2 switch Oildyne pump wiring diagram??

    The trim/tilt switches have been messed up in my boat for a long time. The switch on the throttle lever only goes up and the switch on the base of the controls only goes down. I have lived with it up until now. My guess is that the limit switch is the problem with the up on the handle but not...
  2. thumpar

    5.7l vs 4.3l fuel usage?

    As I am looking at boats I really want a 5.7l but I am concerned about the fuel usage. We have a 120hp now and know that anything bigger will use more fuel. Normally we just cruise down the lake to our favorite spots 10-15 miles down. I want to get there faster but don't want to spend a ton...
  3. thumpar

    New grease seal with gimbal bearing?

    I am going to be replacing my bellows and gimbal bearing next week. Do I need a new grease seal too? I want to get the parts on order and not miss something.
  4. thumpar

    Going from Merc to VP. Maintenance differences?

    We are looking at getting a little bit bigger boat. I have been doing everything on my Mercruiser on my own for the past 7 years. What is different with a Volvo as far as impeller, alignment, bearing, bellows type stuff. We are looking at mid 90's to mid 2000's range and something with a 4.3...
  5. thumpar

    Black smoke at first startup.

    This just started the last few times we have gone out. When it is first started after sitting for almost a week we get a few puffs of black smoke. I have to keep the throttle up to keep it running. It also sounds like it is missing for a minute or so. Once it smooths out it will idle fine...
  6. thumpar

    Tapping a Merc 120 for heater.

    I am wondering if it is possible to tap my '83 merc 120 for a small heater core. It is raw freshwater cooled. I would like to tap in a small core to provide a little heat for the hands and for the kids to warming up infront of for late season fishing on the lakes. I am capable of building the...
  7. thumpar

    Alternate outdrive serial number location??

    I have a 1983 boat with a 120 Mercruiser in it. The upper serial number on the outdrive is 6365658 but the other serial number (on the side of the drive) is cracked and I can only see the first caractor (6) and barely any of the second caractor. The serial number matches the pre-alpha but it...
  8. thumpar

    MCM intermediate shaft drain??

    I winterized as I usually do and my new neighbor tells me I need to drain my intermediate shaft on my 120 Mercruiser. I have never done it before and think he may be full of it. Can anyone tell me what he is talking about? Thanks
  9. thumpar

    Looking at 94 kawi 750 xi. What to look for.

    Anybody have any tips for me. I am planning on looking at a 1994 kawasaki 750 xi. Looks to be in good shape. Owner says it ran great last season and started right up this season but has not been out yet. He has owned it for about 4 years. Was bought so other family, he said parents, could...
  10. thumpar

    How long is treated fuel good for?

    I filled my tank with mid-grade and treated my fuel at the end of last season (mid-september) with fuel stabilizer. We just had a baby and we don't plan on getting out much this summer. I hope that I will use up what is in the tank now. It is a small tank in a 1983 16.5' Sunrunner with merc...
  11. thumpar

    Props with a flat edge??

    This is really out of curiosity. Why do some boats, outboards really, have a flat edge on the prop and all others don't? My friends mastercraft has one.
  12. thumpar

    Hours. What is high? What is low?

    Can someone give me a comparison between hours on a boat and miles on a car. I am somewhat new to boat ownership. This is mostly out of curiosity. And I know that it is not a meter as to how it was run/maintained but it is at least some indication of usage. When I got my boat it had about...
  13. thumpar

    Adding trim guage to merc 120??

    My boat doesn't have a trim gauge and I would like to add one. It has an alpha 1 and the sender is there but no gauge. Is there a particular one I need or are all the Mercruiser trim gauges the same?
  14. thumpar

    Coil wiring seems wierd.

    So I am changing to pertronix ignition and coil. There were 2 wires on the + side of the coil. I removed them and traced them back and found 1 goes to the back of the starter and assume this is from the ballast resistor. The other wire goes to the front of the engine just under the valve...
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