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  1. jimmbo

    Outboard top cylinder getting hot

    Signs of bad Head Gasket? Low compression is one, Water the Cylinder is another, When you remove the Head, the gasket itself might reveal the failure, but the Head and Block can sometimes also reveal the leak. You will need to check the Head for Warpage, and should Lap it to ensure a flat...
  2. jimmbo

    Is my Mercruiser fuel injected or carb?

    Nor does it have a choke, accelerator pump or idle mixture screws, which are visible in the pics
  3. jimmbo

    1989 20 hp Johnson bearing carrier seals

    I will assume this non thru Prop Exhaust gearcase. Clearance for a Socket, most likely, and the contact area is Circular, not a Hexagon which could chew up the housing. Years ago they used Screws, not Bolts, but the thread was the same
  4. jimmbo

    No spark

    Welcome to iboats How did you determine that the Coil and Rectifier were bad? Here is wiring diagram for you engine, in case you don't have it.
  5. jimmbo

    Just thought I'd share a nice photo.

    65 66 67 68 69 70-71 72 My 78 90hp, and 84 115. The Brown had to go
  6. jimmbo

    1989 20 hp Johnson bearing carrier seals

    Two seals were the norm, for many years, then someone designed a Double Lip Seal, that way if it fails the Internals become water cooled fast, and don't stand a chance. With 2 seals you might get some time and notice water in the Oil
  7. jimmbo

    Outboard top cylinder getting hot

    Welcome to iboats A 30 PSI difference is not Good. Time to remove the Exhaust Cover and look at the Pistons for scoring, and to check for tension on the Rings. BTW, on a 2 Stroke, you don't need to do the WOT thing when doing a Compression Test
  8. jimmbo

    Just thought I'd share a nice photo.

    I would try to find a Band/Wrap from a 1968 or 69 motor, even a 70 or 71. Mercs look best with Red. I did that back in 1986 with my 84 115, you can still see the Brown on the lower cover
  9. jimmbo

    Just thought I'd share a nice photo.

    Your motor has a 84/85 cowl wrap, and faceplate from 1980 - 83
  10. jimmbo

    61 Sea King 40 hp need head gasket

    There were differences between the Powerheads with Stats and those without. The cooling System on the Stat Engine would send water back to the water pump until it warmed up enough to open the stat. That required extra passages in the Head and the Block, and a Gasket to match. It took some...
  11. jimmbo

    61 Sea King 40 hp need head gasket

    Built by Gale, a division of OMC, that sometimes had slightly different engine blocks than the Evinrude and Johnson motors of same/similar hp I don't think the Head gasket from the same years of E/J engines will fit, as the E/J had a thermostat, while the Gale Products didn't. Maybe a gasket...
  12. jimmbo

    1978 Evinrude 140 V4 Only firing on 2 cylinders

    BRP comes to mind
  13. jimmbo

    Correcting gear ratio with prop size

    Speed over the top of the water will be different the speed over the Bottom, because the water itself is moving. GPS is measuring what speed is over the Bottom In the example below, lets assume the water pressure speedo is accurate Boat speed of 35 mph on a water pressure speedo, going with a 5...
  14. jimmbo

    VP 5.7 GL caruburetor swap to 4 barrel?

    I used a Holley carb to replace a Holley, but I did have to use a different anchor point for the Throttle Cable(still on the stock anchor block)[Black Arrows], and adjust the Length of the Cable, and did have to transfer and flip the Cable Connector Adapter on the Throttle shaft(White Arrow)...
  15. jimmbo

    1994 Force 120 Low compression on top cylinder

    A leaky upper Crankshaft Seal or Bearing Cage Seal, can cause a leanness in the Top Cylinder
  16. jimmbo

    Merc 650 prop shaft seals

    There are tools that can extract Seals in place. They kind of look like a piece of Threaded Pipe, fit over the propshaft and then turned, The Threads bite into the seal and then it can be pulled out. Don't go trying to use a piece of Iron Pipe, as it is too rough inside and will damage the...
  17. jimmbo

    Ignition coil issue - 1974 Evinrude 9.9

    If you got a shock, it appears that the coil is functioning, and perhaps there is a Problem with the Plug(cracked Insulator, carbon tracks on insulator)
  18. jimmbo

    Correcting gear ratio with prop size

    It will report the Speed over the bottom of the river, not the speed in regards to the water, if there any movement of the water. Hence in a current of 5mph, a GPS will report a 10 mph difference in the speed depending which way the boat is going
  19. jimmbo

    Vintage Mercury Cooling Issue

    Those Red Decals are pretty much the Best that Mercury ever ever used on their Motors
  20. jimmbo

    1984 Mercury Blackmax 150hp questions

    When you replaced the Water Pump, you did install the Key/Pin that ties the Impeller to the Driveshaft?
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