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    Shift shaft seals

    1975 85hp. Mercury shift shaft Will someone please help with how to put the seals in the bushing, my 72 year old eyes don`t work very well, I can`t be sure of the seal lip even with a magnifing glass. That is why I asked if the springs go up or down. THANKS CHUCK
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    Shift shaft seals

    There was only one seal in the bushing and I don`t know if it was in right. the spring was up. How do the seals go in? is the spring up or down in the lower seal? and up or down in the upper seal? I say spring because I can see it better then the lip of the seal . old eyes...
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    Holes in lower unit

    On a 1975 85hp.Mercury lower unit, there are 3 holes about 1/4 inch dia. Gear oil is leaking out of the lower hole on the right side. There are 2 holes on the right and 1 on the left. I put new seals in the lower unit and new water pump. I tried to put up a picture but crashed 3 times...
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    Is it steam ?

    On a 1975 85hp Mercury 850, I run it on the hose for a short time and shut down to check compression. When I removed the spark plugs what looked steam came out of the no. 1 spark plug hole, the compression is 140 on this cylinder and 150 on no.s 2,3,and 4. If it is steam, what could be the...
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    1975, 850 merc.

    The lower unit on this 850, has a hole on each side , about 4 inchs from the front edge, the holes are at the same level as the oil fill hole. Can anyone tell what they are for? I`ll try to put up some pics. THANKS......HAS
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    Quieter engine

    I noticed some outboard motors have sound absorbing material in the covers and on the inside of the wrap around cowl assembles, a lot of it is 1/2 inch foam. The parts book for the 1975 Mercury 850 has a sound absorbing blanket for the wrap around assemdly on page 6. Would it harm the engine...
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    What is this ?

    1975 Mercury 850 4cyl. Can any one tell me what this is on the top side of the drive shaft housing plate. This plate is no.17, part no.66100a2 in the Mercury parts book for this engine. This thing is in the top of a hole and the water tube is the bottom of same hole in this plate. This is the...
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    Spark plug wires

    I`m working on a 1975 Mercury 850 4cyl. and it needs new spark plug wires. Is there anything special about the wires for this engine or can I make them up using 8mm auto. wire?..........THANKS AGAIN.......HAS
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    To say thank you

    I say THANK YOU to the men that freely gave their time and knowledge to help me with this engine overhaul. I now have 8 hours on my 1985 50hp. 4cyl. overhaul and I noticed some changes, on the start up the idle was 1200 rpm up from 800 rpm before the overhaul. I have only set the timing...
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    Help need more carb. Info.

    I have the carbs back on my brother-in-laws 1993 40hp. Johnson, but I don`t think they are right, still on the muffs, I got something that might pass for an idle to check the the timing, which is at 2 ATDC. What I noticed when trying to...
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    Carburetor info.

    On a 1993 Johnson 40hp. 2cyl. 2stroke with 2carbs. Got the carbs. overhauled and put back on, set the float like Joe Reeves said and I have no leaks, THANKS JOE but idle is around 1500rpm. I Stated to do a synchronization, but am having trouble with the Seloc book, it is hard to...
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    Carburetor info.

    I`m new on this Johnson forun but have been on other iboats forums. What I`d like to know is the float height and drop for the carbs. on a 1993 Johnson 40hp. 2cyl. 2carb. 2stroke, the model no.is TJ40ELETB. carb. no. is IR432439..................THANK YOU.............HAS
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    How to test a switch box

    I have a switch box no. 323-5772 off a 1979, 85 hp. Mercury, is there a test procedure for this switch box when it is off the engine?............THANKS.......HAS P/S Faztbullet I sent you a PM on the 29th
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    Year & hp. Again

    The serial no. is on a tag on the swivel bracket, the no. is 2537359, the block has the no. 8716590 on it. The exhaust cover has the no. 73278 on it and I think the switch box no. is 332-5772A1. This engine has 4 ignition coils, and 2 carburetors, the starter no. is 50-66015 with a date...
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    Year & hp

    Can anyone help me with the year and horsepower of the engine with this serial number 2537359?? the owner thinks it`s a 80hp. but don`t know the year.............THANKS...........HAS
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    Stator test

    I need the test procedure and specifications for the stator on a 1975,model 850 4cyl.Mercury. The stator only has the wires that go to rectifier, it does not have the ignition wires. the serial no. is 4295510, I have not found any info. for this stator and the only no. on it is 16 and...
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    Mercury service manuals

    Can I get some help with the service manual index on the sticky by DON S, FAQ FOR MERCURY OUTBOARDS? I don`t know how to read it to get the right number for the manuals I need. First is my 1985 50hp. 4cyl. serial no. a131226 model no.1050525 (I have not seen that serial anywhere).The second...
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    What size engine?

    What determines the maximum size outboard engine a boat should have?.....HAS
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    Wiring question

    Under the engine covers on my 1985 4cyl. 50hp. there is a 20amp. inline fuse in the large red wire that comes form the main connector, to a splice,from the spilce 1 red wire goes to the starter solenoid and the other red wire goes to the rectifier. The fuse is between the...
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    Update on 1985 50hp. Overhaul

    Got the new switch box from iboats today, I put it on and give everything one last check, hooked up the hose, turned the key, pushed the choke button and it started and run it 800rpm. Everything was working fine. set the carb. screws 1/2 turn richer, I let it run for 45 minutes checking...
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