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  1. redgoat

    Reverse engine lock won't hold on vintage Mercruiser IO 153 cu.in. 120 hp engine

    There are two hydraulic lines going to the outdrive to tilt it--one line on each side of the outdrive. Unlike newer outdrives, this mercruiser outdrive only has a "tilt" capability for shallow water and for trailing. There is no "trim" capability like newer models. When this boat was new, I...
  2. redgoat

    Reverse engine lock won't hold on vintage Mercruiser IO 153 cu.in. 120 hp engine

    Bought this 17' Sea Ray brand new in 1967 and I can assure you that it is a genuine Mercruiser engine. The engine serial number is 2050478 and the stern drive unit serial number is 2069523. Boat is currently is in storage for winter so the best photos I have to show are attached.
  3. redgoat

    Reverse engine lock won't hold on vintage Mercruiser IO 153 cu.in. 120 hp engine

    There is a spring loaded lever on my outdrive that is identified as "Lock" and "Unlocked" designed to keep outdrive locked down when operating in reverse. My outdrive will release and raise up in the water when engine is put into reverse even though lever is in the locked position. Is there...
  4. redgoat

    Mercury 4cyl stumbles at hole shot and underway

    Problem solved. It wasn't carburetor or ignition causing my hesitation. It was simply a blocked fuel tank vent hose. After replacement with a new vent system, the boat performs perfectly. I'm surprised no one suggested that the fuel tank may not be properly vented. With a 54 year old boat...
  5. redgoat

    Mercury 4cyl stumbles at hole shot and underway

    Also, this might be significant. I have a Filt-O-Reg fuel pressure regulator device installed in front of the carb inlet that has been there for perhaps 20 years. Could the internal workings of this device be destroyed to the point of affecting my correct fuel delivery to the carb bowl and...
  6. redgoat

    Mercury 4cyl stumbles at hole shot and underway

    Still having the same issue. When I rebuilt the carb, I used a new, old stock quicksilver rebuild kit. Have the rubber on the accelerator pump changed over the years to last longer or could the one I used to replace have been too old to use. Also, can ethanol in gas affect the accelerator...
  7. redgoat

    Mercury 4cyl stumbles at hole shot and underway

    I like your suggestion. Where did you order your accelerator pump? I'd hate to buy another complete tune-up kit just to get the accelerator pump & spring.
  8. redgoat

    Mercury 4cyl stumbles at hole shot and underway

    OK. I have a 54 year old Mercury I/O 120 hp, 153 cu.in L4, 2.5L Last year, it developed an issue with hesitation and stumble at increasing throttle--especially at hole shot. It starts quickly, idles just fine and has a perfect point dwell and perfect timing. I suspected old ethanol gas and...
  9. redgoat

    Water thermostat: install with spring up or spring down on vintage mercruiser I/O?

    I have a vintage '67 I/O with a 120 hp Mercruiser engine that is a 2.5L 153 cu.in. 4cyl design. I think I may have installed my water thermostat incorrectly over the years and am now determined to install it correctly, if previously it was wrong. The thermostat will "fit" into the engine hole...
  10. redgoat

    Hard start sometimes after engine is really warm on '67 Sea Ray 4cyl.

    My '67 Sea Ray I/O with a 2.5L 153 cu.in. 4 cylinder engine with a 2bbl carb is sometimes hard to restart after shutting it off after a hard run. I have to raise the "cold start" lever to get it to restart and then as I lower the lever and reduce the high RPMs I then have to sometimes throw it...
  11. redgoat

    Replacing 143* thermostat on 120 Mercruiser I/O 52 year old Sea Ray

    I am the original owner of a 1967 Sea Ray I/O with a 153 cu. in., 4 cyl mercruiser engine. Recently I had to replace a badly worn water pump impeller that was causing my engine to overheat. I thought I might as well replace my thermostat as I cannot recall how long it's been since I replaced...
  12. redgoat

    Mixing lower unit gear oil on Mercruiser stern drive

    Is it safe to mix Quicksilver High Performance Gear Lube SAE 90 with Mercury High Performance Gear Lube+ SAE 90 in my Mercruiser IO 120 outdrive?
  13. redgoat

    Bilge suddenly taking on large quantities of water + odd engine noise

    My 51 year old Sea Ray with a 153 cu.in. 4cyl Mercruiser I/O engine suddenly began taking on water in the bilge area and then making a strange noise in the engine compartment. The engine did not stall so I idled back to the dock knowing something was amiss. During the trek back to shore, I...
  14. redgoat

    Throttle handle loose on Mercontrol. How is it fixed?

    The throttle handle is loose on my 47-year-old Sea Ray with a Mercruiser control. The control shifts flawlessly but the handle for some reason is loose. The handle has splines that go into the control housing. The model Mercontrol is either B-34744A1 or B-44958A2-A5. I got these numbers from...
  15. redgoat

    OLD Roch carb hard to start after hard run w/o raising "lift for cold start" lever

    OLD Roch carb hard to start after hard run w/o raising "lift for cold start" lever My 47-year-old Sea Ray with a 153 cu in 4 cyl. Mercruiser engine and a 2bbl Rochester Carb is hard to start after being run for 45 mins or so. Many times I have to lift the "lift for cold start" lever next to the...
  16. redgoat

    Full tank or nearly empty for storage

    My 46-year-old Sea Ray I/O has the original steel gas tank. With the addition of ethanol to gas I am concerned about whether I should store my boat full or partially empty assuming I use StaBil marine formula for ethanol. The boat is stored in an unheated garage for 6 months. I also do not have...
  17. redgoat

    Little Dude trailer brakes need attention

    Re: Little Dude trailer brakes need attention New brake assemblies came today and were surprisingly easy to install. I flushed out all the old brake fluid with new fluid and then attached the brake lines to the wheel cylinder. I think I can bleed the brakes with the help of a friend but may...
  18. redgoat

    Little Dude trailer brakes need attention

    I have a 46-year-old Little Dude single axle boat trailer that still transports my 17' 1967 Sea Ray boat. The trailer company is long since out of business. My question pertains to the surge-type of brake system on the trailer. I think my brakes may need to be serviced with new shoes, springs...
  19. redgoat

    120 hp Merc I/O outdrive won't stay down when locked in lock down position

    My 46-year-old Mercruiser outdrive will raise up when put into reverse gear even though the lock latch is in the lock position. This happens at slow speed as that's about the only time I use reverse. The engine will raise up a bit as though it is in the unlock position. Is there a simple fix for...
  20. redgoat

    120 hp Merc I/O outdrive won't stay down when locked in lock down position

    My 46-year-old Mercruiser outdrive will raise up when put into reverse gear even though the lock latch is in the lock position. This happens at slow speed as that's about the only time I use reverse. The engine will raise up a bit as though it is in the unlock position. Is there a simple fix for...
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