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    Merc 850 crankshaft play?

    Hi All, Have a 1977 Mercury 850. I pulled the upper bearing cap today to inspect the bearing. My bearing felt fine but I noticed I have some side to side movement of the crankshaft ( right at .005 ) When I re-install the bearing cap, there is no play. I'm thinking I have a problem!! I have...
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    Mercury 1977 850 bleeder line

    Hi everyone, I have a 1977 Mercury 850 Serial #4719943. The bleeder line which runs from the bottom of the crankcase to top of the crankcase has a check valve at each end. The upper valve is one way in, the lower valve is a one way out. This bleeder line supplies the upper main bearing with...
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    Mercury 850 cowl seal

    Hi all, I have a 1977 Merc 850 and have found and purchased a NOS lower cowl seal still in the package. Does anyone know if it is possible to assemble this seal (P/N 60898) without taking power head loose? If not how must I go about installing the new seal? Thanks hereto
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    850 mercury charging problem

    I have a 1977 mercury 850 with ADI ignition. With the engine not running I get 12.5 volts at the battery. with the engine running I am now getting 13.2 volts at approx. 1500 rpms. I remember checking the voltage with engine running before and was getting something a bit over 14 volts. My tach...
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    85hp PTT help

    Hi all, Have a 76 - 85hp merc with PTT. Pump is the A series, 4 hose , 2 cyl. Noticed when I applied additional throttle in reverse the engine would jump a bit, Does this everytime. Didn?t before. Checked out all mounting hardware, and nothing is loose . I?m quite sure the problem is my...
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    Radio Shack Rectifier for 850 Merc

    Hi All, Have a 1976 850 Merc, this has the ADI ignition. Need to replace the rectifier, would like to save some bucks by going with the Radio Shack version I have been reading about in the forums. I have contacted 2 near by stores and told them I was looking for a 25amp 200v Full-wave...
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    Mercury 1976 85hp Power Head Switch

    Hi all, I have a 1976 Merc 850 which has a bad power head. I have a chance to pick up a 1978 Merc 800 80hp.( this engine is power head ONLY) I plan on using all my components off the 1976, Carbs, flywheel etc. From what I can tell the 80hp 1978 thru 1983 all should bolt up. Am I missing...
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    1977 Mercury 850 upper oill seal

    Hi, Need to replace the upper oil seal on my old merc ( 1977 850 ). Have been told I need to pull the end cap? I don't see why the end cap needs to be pulled just to replace the oil seal. Am I missing something? Planned on carefully prying out the old seal, and pressing in a new one. Would...
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    85hp merc, pwr head stuck to exhaust housing

    Hi all, I have a 1976 Merc 85hp which is mounted on my boat transom and I am preparing to replace the power head with another I have acquired. I am going to just lift out the power head with the help of a friend, will not be using a hoist as the power head is not that heavy. Now, here...
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    Looking for a Tachometer

    Hi All, Trying to find a tach that will match the other gauges on my dash. Not doing any type of a restoration so the tach doesn?t need to be pristine, just needs to work. This gauge was sold by Quicksilver and was a popular model in the seventies. There were a bunch around, I?m just having...
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    850 merc Idle issue

    Hi all, Hope someone out there can shed some light on my idle issue, as I have spent the last year trying to find the problem with no success. I won?t go into what all I have done to try and find what is causing the problem but it has been considerable. Here is the problem. After...
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    Mercury 4 cyl switch box

    Hi all, I recently picked up a used switch box for my 850. I am guessing it is a CDI. It has a black wire comming out of the potting which my original box did not have. I am assuming that this wire is intended to be hooked up to ground? Can anyone verify this for me? Thanks in advance hereto
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    Help with 850 Mercury bleeder line

    Hi all, I have a 1976 850 Mercury and am replacing the bleeder line. At each end of this line there is a brass fitting with a hose barb to which the line attaches. I have not been able to find any info on this bleeder line in either of the manuals I have. Questions I have are listed below...
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    850 Switch box died!

    Hi all, Sure could use a bit of help. I have a 1976 Merc 850 with ADI ignition. This guy had been running GREAT up to a couple of days ago. My out of gear Idle is set at 800 RPM, when I would put it in gear it would stumble and die. Would restart, it would idle great then die when put in...
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    850 water pressure gauge

    I have a 1976 850 Merc which I am about to install a 15psi temp gauge. My first thought was to install the line with a "T" to the pee tube. Was told it would be better to install the line by removing a plug from the block? I can't find a plug to remove, can someone point out where this plug...
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    looking for speedometer

    Hope someone out there can help me out. Am trying to find a 70's model speedometer which will match my tach. The speedometer I am looking for has a Mercury PN. 55756A1 and is no longer available, so I'm looking for a used one. That part no. can be either a square or round face. I need the square...
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    Need help mixing gel coat

    I am going to be making some small repairs which will require my working with about a table spoon spoon of gel coat at a time, How much hardner ( Drops ) will I need to mix with a table spoon of gel coat to get a proper cure. I purchased the gel coat which is matched to my color hull from Ranger...
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    850 mercury water, leak into cylinder

    I have a 1976 Mercury 850 I could use some help with. Yesterday I noticed a small amount of milky material comming from the lower unit while it was setting at an idle. Went down to check on it the next morning and discovered a thick black residue running down the length of the skag, this was...
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    Early Merc pwr. Trim/tilt

    I have a 1976 Mercury 85hp with the early model pwr trim/ tilt, two cylinders and pump mounted in boat. I checked the oil level in the pump and saw that it was correct, but the oil looked very dirty (black). I have two manuals, Clymer and Selco , neither makes any mention as to changing the oil...
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    85hp Mercury Water pump

    I have a 1976 Mercury 850 85hp serial no. 4367785. I am wanting to put a water pump kit in this guy but I am concerned about getting the wrong kit. I would greatly appreciate some help to make sure I purchase the correct kit. hereto
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