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    75 HP Mariner Ignition Problem (This is a tough one)

    My 87 Mariner has me stumped. It ran perfectly until 3 years ago when the boat it was on rotted out. It was then stored outside on a stand under cover. Mounted it on a new boat 2 weeks ago and it wouldn't start. I knew the stator and trigger coil windings were iffy, wires beginning to corode...
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    Fuel pump diaphram kits - Be careful

    I recently purchased a fuel pump diaphram kit from a local marine supply house that has always served me well. The kit was for the triangular pump used on many of the 70's and 80's motors. Long story short, they sold me a kit that fit and looked right but the gaskets were just a little...
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    Setting the timing pointer - 1986 60HP 3cyl

    I am checking the setting of the timing pointer prior to adjusting the timing on the engine. All the threads and even the manuals say to adjust the pointing indicator at the .464" mark on the flywheel. What I don't understand is why I can't simply adjust it at the TDC or 0 degree marking on...
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    Need help identifying Tilt/Trim unit

    Hi Just bought an older 17 ft BassTracker (all aluminum). The motor is a 1992 60 HP Merc with what appears to be a aftermarket tilt/trim. I bought it knowing the hydraulic pump was bad, but expected to find some sort of manufacturers name and model number on it so I could get parts and repair...
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    75 HP Mariner Flooding problems

    I have a 1987 Mariner 75 HP that exhibits a weird problem. It will start right up with only a little use of the enrichener. If I back out of the slip sucessfully it will run all day with various starts and stops as needed. No problems. BUT if I stall it while backing out of the slip, theres NO...
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    stick steering - too much force required

    I have a homemade 18ft. flatbottom with a 1970 70HP merc longshaft and stick steering. The motor height is set where the cavitation plate is about even with the bottom. The problem is that the stick requires about a good 15 lbs of push or pull to steer when running about 23 mph and nicely...
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    Electrical Diagram 3 Cylinder

    Recently I had to do some electrcal work on my 1979 70HP 3 cylinder Merc. I had a lot of trouble finding a GOOD schematic of the electrical system. Especially one which showed the keyswitch in sufficient detail and preferably in color. I finally found one from another motor which was identical...
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    DIT repair of stainless prop

    I have a stainless steel prop off my Merc 70HP which has a few very small dings in it. (Leading edge, near the hub, perhaps 3/8" long and less than 1/8" displaced fron the normal curve) Is the metal in a stainless prop mallable enough for me to simply work out these dings with a hammer and...
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    what lower units will fit ?

    I need a good used lower unit for my 1970 Merc 70HP longshaft. The parts manuals list the same gear housing assembly number (6038A6) for 50, 65 and 70 HP models from 1972 - 1979. As i look in various ads for used lower units i find units advertised , saying they will fit my motor from newer and...
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    Confused on shaft length ????

    I have a 1979 70 HP merc The distance from the transom to the cavitation plate is (carefully measured) is 17" The length of the lower housing measured from where it bolts to the motor head to where it bolts to the lower unit is exactly 20" Is this a short shaft or longshaft engine ???? Bud...
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    How I Got My Lower unit Off

    I know removing a merc outboard lower unit can be tough and I have read many posts on how to do it, none of those worked for me. The subject is a 1970 70 HP merc (4 nuts, 1 bolt) lower end that to my knowledge has always been in saltwater and had never had the lower unit off (I KNOW this to be...
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    Lower Unit Stuck - 1979 Merc 70HP

    I think I have a common problem. I cannot get the lower unit off my 70 HP merc. It drops about 1/4" and no further. I've tried all the suggestions, penetrating oil, wedges, backing off the 2 nuts forward to pull the foot down, taping on the crankshaft end, etc., etc., etc.. I even made a...
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    30 HP Mariner Ignition Problems

    Bought an older 30 HP Mariner (1984 I think)- been sitting under a tree on an old boat for 5 years. Everything including compression looks good but no spark.<br /><br /> Here's what I checked. Charge coil - meets resistance specs. Sensor Coil - meets resistance specs. Spark coil - meets...
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