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    Raw water pump

    Not sure what kit you're referring to but ime there are two sizes of impeller. A white hub impeller is a standard/original style size impeller with no wear plate in the housing, red hub impeller is .030" shorter and requires a wear plate in the housing The housing cover is either solid brass or...
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    Grooves worn in driveshaft

    There's not much room, if any at all for those seals to be set in a different location. Use the install tool and they seat in place against the shouldered area in the housing MC-1, R/MR/Alpha 1 is easy to replace the lower seal. Upper seal requires removal of the driveshaft meaning disassembly...
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    Alpha 1 Gen 1 - Teardown - Need Advice

    Those seals aren't even close to being okay. I wouldn't trust them for a minute of use let alone a full season. Based on the picture I'd guess both drives are in need of complete reseals Did you pressure test the drives before filling with lube? Don S. had a signature that said, "Why is there...
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    1987 CHRIS CRAFT AMEROSPORT 284

    Agree with the afore mentioned tests by others regarding the fuel sender/guage system. You test the sender, wiring and guage output. Most often the culprit of a faulty fuel gauge reading is the sender, however it could be wiring or the guage itself I would add a cap/rotor and points set (if...
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    Mercruiser 502 (7.4l) turning over slowly, won't start.

    This is the first time you've checked the oil level/quality? As in you attempted to start the engine for the first time in six months without checking fluid levels prior? And someone besides you did the last oil change?
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    MC-1 (aka Pre-Alpha) Gimbal Ring Replacement

    My thoughts exactly, cannot guarantee proper engine alignment by using the old with the newer. Might be able to fudge it with washers if the situation calls for but then you're getting into fabrication. Not the best/safest route
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    MC-1 (aka Pre-Alpha) Gimbal Ring Replacement

    Would be the route I'd go as well however my only issue would be the compatibility of the original inner transom plate with an alpha one gimbal housing. I guess if it doesn't line up correctly one could ammend the original inner transom plate to work but cannot guarantee it will work...
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    Low fuel pressure, fuel filter half full while idling.

    First picture shows the fuel out and return lines at the water separator housing. Second picture shows a fuel regulator on the fuel rail which in most cases isn't the regulator in question. Mercruiser used a few different styles of fuel supply systems over the years and in many cases added the...
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    Mercruiser 2.5 120hp ignition help

    The 2.5 and 3.0 liter engines mercruiser used in oem setups were never marketed by GM for automotive use. The engines were designed and built for marine and industrial use only. AFAIK the 2.5 liter displacement engine never used an electronic ignition as it was phased out of use by mercruiser in...
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    MC-1 (aka Pre-Alpha) Gimbal Ring Replacement

    You need to remove the nut on top of the steering shaft and loosen the tiller arm to drop the shaft out of the gimbal housing. You're gonna have a tough time finding replacement parts too. You may be able to upgrade to a later style alpha transom assy. The only hangup would be the inner transom...
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    Mercruiser 502 (7.4l) turning over slowly, won't start.

    If it's a sterndrive I'd pull the drive and test the starting again If it's an inboard/v drive the issue could be within the transmission, engine mechanical or still an issue with the starter/batteries
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    Mercruiser Carb with 3.0 engine Alpha 1 is running a little rich. Do I go in or out with screw?

    Out/left for richer, in/right for leaner Idle air mixture adjustment should be performed in gear at idle speed in the water
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    95 4.3lx alpha one mercruiser cooling system question

    Like bondo says feel free to replace any parts you like but without troubleshooting the issue it's a guess as to what components have failed. First item I would check based on your issue is the check balls/springs at the t stat housing leading to the risers, this is of course if your...
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    First Start of the year and High Oil Pressure

    Not really. The cheapest option from rinda would probably be the techmate which is $500 or more
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    First Start of the year and High Oil Pressure

    Depends on the harness/guage wiring. Some vintages of mercruiser used analog and digital readings. Your picture of s/n indicates mercruiser mpi which decidedly indicates known smartcraft faults when not equipped. Quite common but not an indicator of audible faults. It's great you no longer...
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    RE: Issues with Mercruiser 5.0 LX 4 Barrel Carb

    Understood What caused the low compression?
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    First Start of the year and High Oil Pressure

    No You remove the wire(s) from the sender and test accordingly. It helps if you understand how an electrical circuit works. Source, supply, load(s) and return. To properly test any electrical circuit you must understand not only how it works but also why it works.
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    RE: Issues with Mercruiser 5.0 LX 4 Barrel Carb

    Awesome! Can't help you with info regarding a replacement long block but.. What was the failure in your current engIne that requires the replacement?
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    First Start of the year and High Oil Pressure

    Not as I read it. See my post #20 The true test is removing the sender from the circuit. You must first test a solid ground, then with confirmed ground test sender wire to guage. This means using a known good ground (both sender ground lead and battery) and known good 12 volt (+) lead. In...
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    First Start of the year and High Oil Pressure

    Maybe, testing the guage/wiring means abating the sender from the circuit during the test, i.e. grounding/applying 12 volt (+) to the sender wire and reading guage Your info reads as including the sender as part of testing. Hard to convict the sender when your test doesn't remove the sender...
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