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  1. Scott06

    Not getting fuel

    Entirely possible needs a carb rebuild. When this happens do you have spark? If u dump a little gas down carb and you have spark it should at least cough if not run for a bit. Need to do some looking if you are missing gas or spark when it happens. Spark gap tester is cheap and effective on...
  2. Scott06

    Temperature Sender?

    Yeah you can use a standard 1/4” npt. Just be aware that the blue plugs do not have a NPT thread on them. I think they are 1/2” coarse so it is not a regular pluming fitting. If I recall I thought there was a thread on here on the knock sensor being a standard GM part. The knock module is a GM...
  3. Scott06

    Mercruiser 5.0 starting problem

    Would rule out some basic stuff like dead battery, loose or corroded battery cables (don’t forget ground cable too). Cycle shift to see if neutral safety is not making. attached is wiring digram yellow red going to slave relay gets power when key is in start. Check for 12 v there. If none it is...
  4. Scott06

    Another prop slipping thread

    I usually go oem. While they are expensive there is too much junk out there last Sierra item i used , trim sender, never worked right . Limit switch works, could never get the sender working right seems to be reasonably accurate at idle speed but goes all the way up when on plane. Too much...
  5. Scott06

    Blown head gasket

    First thing I would think it got overheated at some point. Would check the head and block surfaces for flatness. While the heads are off may have them gone through at a machine shop. Was compression good on the other cylinders? would change out the impeller in drive as a precaution.
  6. Scott06

    Another prop slipping thread

    Rhoads lifters bleed off cam duration at low rpms To tame wild cams And create more low end power and idle vacuum. They reduce the effective cam duration by 10-15 degrees below 3500 rpm. Commonly used in hot rods in the US. Probably the first attempt at variable valve timing, but rather than...
  7. Scott06

    Water in u joint bellows

    I had a similar experience my my old boat which had a Alpha gen one. Had a bad gimbal bearing, pulled drive (first time for me) and found small amount of water in bellows. Could not find a leak or tear in bellows. Put drive back in of course was too green to glue in big ring gasket. Put drive...
  8. Scott06

    What Chevy engine is my 2006 350 MAG MPI Horizon?

    Wikipedia is not a great place to get engine info for parts purposes.
  9. Scott06

    4.3 Mercruiser fuel supply issue

    So the yamies are an interference engine. Whether car or boat an engine exploding itself over a belt never sat right with me.
  10. Scott06

    4.3 Mercruiser fuel supply issue

    Yes definitely advantage of fully draining OB. While I can drain my block (5 plugs easily accessible) we live too far from where we keep it to take advantage of any warm days. You are much farther south..
  11. Scott06

    stuck gen II trim cylinders

    I had to use a two jaw gear puller same reason corrosion pushing bushing out. Needed to get small wire wheel to clean out inside of cylinder where bushing goes as I couldn’t get new bushings in.
  12. Scott06

    4.3 Mercruiser fuel supply issue

    Look under the cowl of a modern 4 stroke, thee are some chit burgers waiting under there as well. My brother has a Yamaha 50 hp 4 stroke fantastic machine but its tight under there too. Also has a timing belt that need changing while a lot of IOs have too much boat around them strikes me as 6...
  13. Scott06

    48 years...

    Would think based on what rpm you give , if prop guy can repitch down 2” you should be there at wot rpm and improve holeshot. Adding cup drops wot rpm similar to adding pitch …
  14. Scott06

    trim gauge

    I tried sierra senders once didn’t work correctly… given age of your boat look at how the bellows are and decide if you want to do the sender alone. I suspect if you take the hinge pins out that will give you more access as bellhousing can flex on bellows my bellows lasted 18 years but i...
  15. Scott06

    trim gauge

    Im not sure what outdrive you have on it? Edit see the TKS Assuming they diagnosed it properly it is a diy. The gauge and sender are separate would get oem parts for sender vs the cheap after market stuff. the issue is while you can replace the sender it is a PITA to get to, easiest done if...
  16. Scott06

    Excessive smoking

    I used Amsoil on my 73 and 75 Evinrudes (9.5 & 15) was very happy with it. I ran it a little leaner than the 50:1 (couldn't go to the 75:1 or 100:1 it says you can) kept my plugs cleaner was less smokey, but smoke wasn't my issue.
  17. Scott06

    260 hp

    would also add in which hull. I assume he is asking how much hp can a Mecruiser drive with a 260 label on it? Would think that is a gen one drive 300 hp or so, maybe 340 ish (383) if you are gentle on holeshot ? If its in a light hull vs heavier hull will make a diff, either way use a marine...
  18. Scott06

    Mystery Knock -- Insurance and Warrantee

    There is no way to adjust a timing chain, would assume he adjusted the ignition timing. The vacuum hose on the cool fuel would be for the fuel pressure regulator. So if you had wrong plugs, non functional fuel pressure regulator, and ignition timing is off and knocking under load ... did you...
  19. Scott06

    48 years...

    Thats a good start although the steering must be weird with L/R reversed.... When you say you had very little propulsion - what do you mean? Did rpms climb with no forward momentum /prop splipping? Or did rpms not go up? Would also check the motor height if too low can cause too much drag. On...
  20. Scott06

    VP DP-SM drain screw leaking

    Order a fatter one or get a O ring kit from the hardware store. VP may have the wrong O ring in their inventory. I had a similar situation at work where a OEM manufacturer used a teflon coated o-ring on a mechanical pump seal - it looked like a sausage... Of course from an OEM this was like a...
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