First thanks to all of you who answered my questions about swapping the lower units from a 73 to a 74. Now my donor engine is quite clean but it needs a new piston and reboring. My question is if oversized pistons are available for this age of motor and do you think its stupid to rebuild such...
I heard mentioned a test for gear case seals by using a bicycle pump to pressurize the gear case using an inner tube nipple? How does one do this? Are leaks easily noted or is it a leak down thing? Thank You!<br /><br /> Michael
In swapping my gear case from a 73 Johnson 25 to a 74 same I noted some black tarry substance between gear case to exhaust housing mating surfaces. Is this a special marine type sealer I must purchase or is there an automotive type that works? ( I have enough of those) Also, in inspecting the...
Hello:<br /> In looking over my compatible donor motor(74 Johnson 25 to a 73 same) I see a low hours motor with electric start and cosmetically excellent (thus my low hours guess). My motor has an excellent running top end with a bad lower unit. Is it less technically difficult to swap the...
Well I think I found a lower unit for my 25hp. My present motor is Model # 25R74M (Ser # E4020482) and my donor motor is Model 25R73A (ser# E3885828). The donor appears to have few hours plus electric start. The owner said his son ran it without oil mixed fuel and ruined a cylinder. I'm...
My 1976 25hp Johnson has a blown lower unit but I have access to another engine similar year with a blown top end. Other than a manual, are there any special tools (ie. gear pullers or alignment tools) that i would need to perform this job? I also would like to replace the impeller and...
Hello All:<br /> Last week I posted a question about my 76 Johnson 25 popping out of gear after the clutch dog was replaced. Now i heard that when the dog is worn out it also places wear on the forward gear and that when the dog is replaced it is common to replace this gear also to remedy the...
Hello All:<br /> My mechanic informed me that my 74 Evinrude 15 had a recall on it after it came (he said this was one of the first years for this engine) out for a failing bearing in the stator plate and a head design that tended to overheat. ( can anyone confirm this?) He showed me the...
Hello All:<br /> I originally hit a rock with my motor and the prop would pop out under load. A mechanic told me it was the clutch dog and he replaced said part for $400. now when I place the engine in gear the shifting lever pops into neutral on its own under load. Is the linkage worn or...
