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  1. thumpar

    EFI throttle body whine

    My throttle body has always had a high pitch whine coming from it at idle. When I first got it I thought it was just the nature of the EFI. I looked into it last year and thought it might be the high pressure fuel pump but that is not it and it is defiantly coming from the throttle body area...
  2. thumpar

    Christmas night clam haul.

    My dad rented a cottage in seabrook WA. Last night after dinner we all went out on the beach to do some night time clam digging. All 9 of us limited (15) out except a couple. We are heading out again tonight.
  3. thumpar

    Why use diesel engine oil.

    So lets not turn this into an "oil thread". I know some people use engine oil normally meant for diesel engines in a gasoline engine. What is the thinking behind it? My only guess is because of the constant speeds and high loads. I am not looking for suggestions on brand or weight just...
  4. thumpar

    My turn to do it. Clean bilge and test pump.

    So I dropped the boat in today and after getting the trailer in I remember seeing the plug on the shelf in the garage. I asked my wife if the plug was in. She says "there's water coming out the side" (bilge pump outlet). I run back to the Burb and yank it out. We had a storm come through a...
  5. thumpar

    Will 350 mag sparkplug wires work on 5.7l EFI of the same year?

    I found a good deal on plug wires for a 350 Mag of the same year as my EFI 5.7l motor. Will they work?
  6. thumpar

    5.7l EFI with cool fuel and fuel in the sight tube?

    Today we were out and just siting about 12 miles out from the launch. When we went to move the motor didn't want to start so I checked it out. There was fuel in the sight tube. I disconnected it from the flame arrestor to get it started and we high tailed it back to the launch. The sight...
  7. thumpar

    Cleaning brake line internals?

    When I go my trailer the brakes weren't working. The previous owner only used the trailer to launch and retrieve once a year so he didn't fix it. I decided to replace the actuator and have new drum brake plates that are complete units. Before I hook everything up I would like to clean out the...
  8. thumpar

    Mercruiser engine driven seawater pump compatibility.

    The original seawater pump on my boat was the multi piece housing type and has been converted to the one piece plastic type. I am looking to get an extra impeller to carry on board in case. Are the impellers between the two the same?
  9. thumpar

    Bravo installation kit. Which o-rings where?

    I have an OEM install kit with the o-rings and water seal. I can't find the information on which o-ring goes where. I can figure out some but this is what I have: 1.424 X .103 1.046 X .139 .924 X .103 (2) .739 X .070 The first 3 are orange. I looked in the manual and it doesn't give which...
  10. thumpar

    1972 Mercury 75 (7.5hp) throttle/timing advance adjustment.

    I have a friend with the 1972 Mercury 75 7.5hp with some issues. He said it would start but then start "popping" and die. I am taking a look at it and found that when using the handle throttle the timing is advanced but the ramp that is supposed to move the throttle on the carb doesn't contact...
  11. thumpar

    2005 Yukon Denali to 2003 Suburban hitch compatibility ?

    I am looking for a hitch for our 2003 Suburban and found someone on Craigslist with a 2005 Yukon Denali factory hitch made by Northern Stamping. Does Anyone know if these are compatible? I can't seem to find much info on that brand.
  12. thumpar

    Replace brass plugs with "blue" plugs??

    My exhaust manifold plugs are the blue plugs but the 2 on the sides of the block are the brass type and a pain to get a wrench to. Can I just replace them with the blue plugs?
  13. thumpar

    1996 5.7l EFI with Bravo 1 overheating immediately.

    I know I need to do diags but we are 2 hours from home and just want to get some ideas to brainstorm. We had the boat out 2 days ago with no problems. We decided to bring the boat to a company party on the river 2 hours from home. We get the boat launched and head out. We get a few hundred...
  14. thumpar

    Verify engine model.

    The paperwork for my new to me boat from the factory authorized dealer says the engine is a 350 mag EFI. It was replaced in 2002 and have the paperwork showing almost $8k to do it. Is there any way to tell if it truly is a 350 mag? The cover says 5.7 EFI. It has the Bravo one drive which...
  15. thumpar

    U-joint bellows orientation?

    I am installing new bellows The U-joint bellows at one end have a flat edge. Do those go vertical at the outdrive side? Also, should the water input tube be install before or after the U-joint bellows? TIA
  16. 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...
  17. 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...
  18. 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.
  19. 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...
  20. 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...
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