Mercury 115 1974 Lower unit Jammed in reverse

[gungalunge]

The Other day comming into the dock i shifted into reverse to avoid bumping another boater pulling out .I was sucessfull . But my shifter jammed . It racheted the lower end did kind a lot .Then a clunk. I took the lower unit off . The shift shaft dont move . Either way ..I am Going to attempt the lower end rebuild . Its not apart yet . I got a list of parts gathered I suspect that I broke that clutch .I better just rip it down and see what happened . New seals bearings and clutch parts seem to be availble . i sure hope the gears are all good any suggestions . I read the manual and see what is ahead .. I see that the basic parts list out to 250 bucks with shipping . lots of pressing off bearings . Has anyone attempted this with out all the special tools ???

 

[MortenH]

Re: Mercury 115 1974 Lower unit Jammed in reverse

I have resealed the LU on my 1984 115 I6 without special tools, it was not very easy but it is possible to do. I also replaced all the gears with parts from a spare LU. I did not have to remove the bearings though. The biggest problem was to get the bearing carrier assembly out. I used a set of wooden chisels to get it out.

-M-

 

[gungalunge]

Re: Mercury 115 1974 Lower unit Jammed in reverse

I got it apart I ordered a whole mess of parts i needed .I am now doing each segment . I did the whole upper power head this spring and wow is all i got to say .until i jammed the lower unit which i did not rebuild thinking it was good . turns out that my pinion nut backed out . "it did not fall off got it in time" the shift cam and rods are wasted.the cam follower clutch and gears both knicked up . the parts are comming 250 bucks for seals and bearings .150 bucks for shifter linkage parts .. I am doing the press work and those bearings are all shot so far .i am making tools and cutting off stuff left and right .this 32 year old motor .is a challange But I will win the war . I think since I went this far I will replace the gears . with new ones allthough the old ones are not that bad .

 

[Texasmark]

Re: Mercury 115 1974 Lower unit Jammed in reverse

Remember your powerhead rebuild. Now you have a new motor. 8)

Good luck,

Mark

 

[gungalunge]

Re: Mercury 115 1974 Lower unit Jammed in reverse

wow tex i got into a new beast . the lower end for me .right now i pressed off all the bearings looked at them .. shoot when i did the engine I should of got in there too .. I am having a hard time finding a shift cam . the reverse gear bearing was scrap ,my pinion nut was loose . the gear lube was stinky . I am all over it . If i can get ahold of a shift cam i would love it .yep the motor is a jewel but this lower is getting the trick too. right now gathering the things i need . buying them right here on i boats 32 year old motor getting closer to new . the tools i explaned being in need of i had in my tool box so far so good . this next week i should be on the lake again if i can get a shift rod and a cam .i still dont have the amd rules wake but a good photo of what goes on in the back will be my happy day