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    350 Magnum Tournament Ski spark plugs

    I pulled all of the plugs after the engine was failing to reach WOT and then backfiring on acceleration. They are all in need of replacement, but one (photo attached) was so bad, the electrode was completely gone. This is a carbureted engine, 1997, serial # OK146780. I was running AC Delco MR43...
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    Fuel Anti Siphon Valve

    In the course of chasing an engine stalling problem on my 1974 Mercruiser 140, I pulled the fuel uptake tube and removed what I assume is the anti siphon valve from the fitting ahead of the fuel line to the fuel pump. In the attached photo, I am depressing the tank side of the spring loaded...
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    MR-1 U Joint Bellows Leak

    My 1974 140 Mercruiser had water entering the bilge from the rear of the engine. With the boat up out of the water on our boat lift, I had my son get in the currently very cold N. Idaho water to inspect the bellows with the drive full up. He said the big hose clamp on the U Joints bellows was...
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    140 Mercruiser Fuel Filter

    I was tracking down a stalling problem in my 1974 mercruiser 140 and checked the fuel filter in the ”bowl” on the top of the fuel pump. When I removed the filter, both of the metal ends fell off, revealing ugly white material that left pieces all over, as shown in the attached photo. I put the...
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    Engine dies after running for several minutes

    My 1974 140/3.0 liter starts and runs well for 10 to 12 minutes, then shuts down, usually with one short surge as it is dies. It first did it last summer, so I replaced the fuel pump, confirmed clear fuel lines, cleaned the tank take up tube, elbow, and ball check valve, treated the fuel with...
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    1974 R-1 140 Outdrive Shift Cable and Kill Switch Adjustment

    After pulling the outdrive for gear seals and water pump replacement, upon re-assembly and start up I followed AChris’ sticky on adjustment. All started out well, but then the engine shut off while going into reverse on the muffs. After a few more tries, it started shifting into reverse without...
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    1974 140/1R outdrive tilt/trim

    After installing a new water pump and yoke seal, I reinstalled the outdrive and. Hacked the hydraulic tilt and all was well. A short while later I tried to tilt with the top 2 buttons of the three button switch and there was no solenoid click and no action. I charged the battery, which did not...
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    Cupped washer on Prop shaft

    In looking at the parts diagram for my 1974 1R drive, I see part 12-35965, described as a cupped washer behind the splined washer on the propeller shaft. There is not one there now and I don’t recall seeing it in the past. Some models have a continuity washer in that spot. Pictures of this part...
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    I cannot post

    I startesd a thread in Mercruiser repair, but my responses say they are under moderator review. What did I do wrong?
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    Gear Oil in UJoint Bellows

    I pulled the drive on my 1974 140 out drive and discovered gear oil in the bellows, as shown in the photo. I assume it is from a failed gear end yoke seal. Is that a realistic repair for a DIY guy? I have access to the required spanned wrench, but am concerned that I could mess up the gears if...
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    5.7 Liter running Rough

    It is an inboard Competition Ski with a carburetor, engine serial # OK146780. This weekend I installed a new impeller. At start up, all was well with the impeller/water pump install, but the engine ran rough. I installed new plug wires, which I had on hand since last season when I installed...
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    3.0 Liter Manifold Drain Plug

    1974 140 3.0 liter. The one on the bottom and on the exhaust elbow are stripped. In the past, I may have forced a straight plug into these, but I believe they are pipe threads. Researching prior posts on this I am unsure whether the existing hole is for a 1/8" NPT or 1/4" NPT. Perhaps my...
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    Noise while tilting and turning outdrive

    I completed reassembly of my 1974 140 after transom repair and replacing shift cable, all bellows, water hose, gimbal bearing and shift shaft bushing. Initial operation on the muffs was good, including tilting and shifting into forward and reverse. Now, just before I was ready to put it into...
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    How do I access wires inside Mercruiser harness plug

    The male prong wires coming out of the plug on my 1974 140 are hooked to wires that are colored differently from those shown in the manual and those on the female side of the plug. I uncovered the wires as they come out of the male plug, but I can't tell which prong they are on. I don't see a...
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    1974 140 Exhaust Flapper

    After re-installing the engine, but before installing the exhaust riser and rubber tube, I had second thoughts about my earlier decision not to replace the exhaust shutters. Although I know it would have been much easier to replace the shutters before installing the engine, I figured that the...
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    Exhaust Pipe on 1974 140 Mercruiser

    I'm getting ready to put the engine back in and am putting on a used exhaust pipe to replace the one shown in the picture, which had been gouged badly by the armoring on the lower shift cable. I have a new seal that is an oval o-ring that goes around the opening of the receiving surface on the...
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    Cork Gasket OK for Gimbal Housing to Transom?

    For my 1974 140 sterndrive, I purchased OEM #27-70974, which was foam rubber, but realized it is a bit different (as some have noted on this forum) from the one I need, which is 27-65373. So, I purchased the correct one, which is cork. I cannot find a rubber version. Before I got the correct...
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    Pre Alpha Bellows and shift cable replacement

    I have the engine out and gimbal housing off my 1974 140 sterndrive. I separated the bell housing and gimbal housing and am putting in shift shaft and arm, new u joint, exhaust and shift cable bellows, new water hose and new shift cable on the bench before re-installing on the boat. I ran the...
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    Front Engine Mounts

    I have a 1974 140 4 cylinder that required replacement of the wood that receives the lag bolts for the front engine mounts. The location of the holes was not identified prior to the work. I'm ready to re-install the engine. I understand the need to adjust and align for the up and down. Will...
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    Transom drain tube

    I have a flanged brass tube that is solid, but it has been in the boat for over 40 years (all fresh water) and there is no sealant visible around the outside flange. It would be difficult to remove and replace the tube because it has an inner transom board in front of it. Could I get a seal...
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