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  1. tpenfield

    Mercury 7.5 HP Motor Refresh (1969 model year)

    I'm seeing these bearing at about $15 each. Can you share your supplier(s) ? I usually like to get more brand name bearings, like Timken, Also, any good sources for the upper and lower seals? I would imagine that they are fairly generic. The Merc part for the lower seal is about $20 :eek...
  2. tpenfield

    Mercury 7.5 HP Motor Refresh (1969 model year)

    OK, thank you. I am still not sure about water getting sucked into the crankcase, but it could have been. I think my plan should be to do the following: (1) New ball bearings (2) New crankshaft seals (3) New piston rings (4) Hone cylinders (5) New gasket set (6) Clean/Decarb the top of...
  3. tpenfield

    Mercury 7.5 HP Motor Refresh (1969 model year)

    UPDATE: I got the powerhead apart . . . The impact driver did the trick. :thumb: Here are a few photos . . . The 'crack' turned out to be nothing more that a scratch on the piston wall and the pistons have little if any scoring on them. The cylinder walls are smooth. I did see some rust...
  4. tpenfield

    Outboards . . . an emerging trend ???

    I just got this from Formula . . . http://www.formulaboats.com/blog/new-formula-350-cbr-outboard-truly-versatile-boat-water/ Formula has long been a strictly I/O type of boat . . . Looks like the are heading towards outboards.
  5. tpenfield

    Closed Cooling System on Port Engine Running Hot(ter)

    The Iron Flush is done. Not sure how much it will help, but it is probably something I should have done before adding the closed cooling. The was a fair amount of iron 'dust' that came out of the engines. Once the acid solution was neutralized the iron dropped right out and you can see it on...
  6. tpenfield

    Closed Cooling System on Port Engine Running Hot(ter)

    Thunderbolt-5 I suppose . . . probably 70K volts :noidea: I kept the Oxalic Acid in the engines over night and then ran them some more this morning, then drained. The stuff went in the engine as a clear liquid yesterday . . . it came out the color of coffee (or stout beer) today., as shown in...
  7. tpenfield

    Painting a S/S Prop

    I painted my SS Bravo 3 Prop sets (twin engines) as a means of putting a weak metal directly on the props and also to keep the marine growth down. In order to make sure I got good adhesion, I pre-heated the props to about 200 degrees in the oven, then quickly brought them outside to put cold...
  8. tpenfield

    Smokey - 1980 Johnson 4.5 HP

    Quick Update: Now that I have the engine running fairly well, I decided to re-paint it and put new decals on it. The paint did not quite match the decals, but it looks 100% better than before. Here is the re-paint Here are the decals. I think the 'Johnson...
  9. tpenfield

    Looking at Formula with bravo drives...No impeller in drive??

    coolant cooled engines on my F-330SS So if you see a big heat exchanger on the top/front of the engines . . . then it is 'FWC', aka closed cooling.
  10. tpenfield

    Closed Cooling System on Port Engine Running Hot(ter)

    FWIW - and because I like graphs, here is a graph of the compression data since 2012. . . My nomenclature is: "SL1" = 'Starboard engine' , 'Left Side', 'Cylinder #1' I think the surveyor rounded 'up' to the nearest 5 psi, which is probably a standard practice. I try to be a bit more...
  11. tpenfield

    Mercury 7.5 HP Motor Refresh (1969 model year)

    Thanks, guys. I'll get an impact driver and see what I can do. Since the bolts are in the crankcase portion of the engine, I assume they will have oil that seeped into them to some extent . . . as opposed to the water jacket covers which had corrosion. I brought the powerhead and the swivel...
  12. tpenfield

    Mercury 7.5 HP Motor Refresh (1969 model year)

    OK, thanks, makes sens. I got to find my flywheel puller. I got most of the motor apart at this point. Trick is not breaking anything. I'm not sure that I will be able to get the Phillips head bolts off, so maybe I will drill the heads off and replace them. The steering swivel has been...
  13. tpenfield

    Closed Cooling System on Port Engine Running Hot(ter)

    I would assume that the MEFI does an analog to digital conversion of the sender's resistance value. One thing I noticed today as I did some more running of the engines, is that the ECT temp changes in increments, as if the MEFI has pre-set values to display and it is a matter of what the A/D...
  14. tpenfield

    Mercury 7.5 HP Motor Refresh (1969 model year)

    I got the powerhead removed from the shaft/housing . . . Here is the base . . . The underside of the powehead Not sure on the next steps to open up the crankcase. Area of lower seal. Nothing jumps out at me, but maybe once I open up the crankcase I'll know more.
  15. tpenfield

    No sea strainers on my boat ?

    Not standard issue with the Merc's . . . not sure about the Volvo's Plenty of after market strainers, and I highly recommend them, particularly with closed cooling. I got these for my twin 7.4 MPI's
  16. tpenfield

    Best way to paint a outboard.

    I use a primer called Primocon (Interlux) Sometimes I use the Moeller Zinc primer. Just painted one of my outboards . . .I used a solvent to wipe down the engine & cowling to get rid of the oil/grease, then primed the exposed aluminum areas (mostly on the lower unit) I just painted my 4.5 HP...
  17. tpenfield

    Closed Cooling System on Port Engine Running Hot(ter)

    OK, all set with the Starboard engine t-stat installation. I ran the starboard engine up to temperature with the new t-stat (w/ 2 small by-pass holes). the engine settles in at about 168 per the gauge at idle speeds and no load. So that is the same as the port engine. We are...
  18. tpenfield

    Mercury 7.5 HP Motor Refresh (1969 model year)

    Update: I think I found a crack in the side of the top cylinder. Not that it would contribute to water inhalation, but an issue nonetheless. It is on the intake side and is visible at the middle port. Here are a couple pictures. I made those up/down scratch marks running a needle over the...
  19. tpenfield

    Mercury 7.5 HP Motor Refresh (1969 model year)

    Yes, back in the day, the Johnny's and Evinrude's were the pick of the ocean. Merc's were more the fresh water engine. 1978-79 is when they got on board. My carbon steel shaft lasted 1 season in the salt. The cleaner of the 2 spark plugs was the lower plug. . . . it looked slightly clean...
  20. tpenfield

    Closed Cooling System on Port Engine Running Hot(ter)

    Quick Update: I'm working on the boat today to see if I can get the leak at the thermostat housing resolved. When I took everything apart and was checking the mating surface of the housing to the intake manifold, I noticed that the surface was not completely flat and the t-stat housing could...
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