WoodHoarder
Recruit
- Joined
- Nov 4, 2015
- Messages
- 4
Hello All,
I have been reading on this forum for several months and would like to post my project and solicit advice from such knowledgeable people. I would also like to document this experience to the benefit of others who would like to attempt a rebuild of a similar engine.
Here is what I’m working with: 1966 100HP Johnson Golden Meteor V4ML-12
Background: This engine was free to me, mounted on a 1963 Lonestar Biscayne. When I started with it, I didn’t even know how an engine worked. So far it has been an incredible learning experience. At this point, from my research on forums and experience in general, I’m generally aware (getting new surprises all the time) of what I’m getting into and the costs involved.
Work so far:
Obtained factory service manual, Rebuilt Carb, Resealed Lower Unit (Type “C” oil), New Throttle Cable, Rebuilt fuel Pump, new fuel lines, changed impeller.
Running Experience So far:
Taken out on the lake twice. Electromatic Shifts Forward and Reverse. Extremely Difficult to cold start. Runs strong at full throttle and stalls out at idle. Used to start easily when warm-difficulty starting seems to have gotten worse over time. Sounds like it is suffering from pre-ignition.
Diagnostics:
Compression Test: Cylinder 1 -90psi, 2-80psi, 3- 85psi, 4-? (Blew tester off, stripping threads spark plug threads)
Spark: Shows Spark in 4 Cylinders.
Where I’m at now: When doing the compression test on cylinder 4 the threads stripped out of the spark plug hole. I pulled the head and the bypass covers on the starboard side. I noted a lot of carbon buildup on both piston heads. There are scores on the piston walls that I can catch a nail on. Bottom side of both pistons show blow-by and scoring on the piston skirts. I haven't yes assessed the port pistons yet.
Plan moving forward: I plan to disassemble the powerhead entirely/removing broken bolts and return it to working condition. Likely over boring cylinders. I am in the process of disassembly now. I've so far obtained a new starboard head and head gaskets. Sound good?
Questions so far: I am attempting to cross reference the parts utilizing the ***************** website. The 1966 part list shows no oversize pistons/rings. The 1967 part list shows .20 oversize pistons (part #0385288). Both blocks are the same updated part number and the standard piston part numbers are the same. Is it safe to assume that these pistons will work in my block?
I’ve found a new Johnson 1965 60hp 060553(part#0382684) block for sale. The back side of the block looks similar to mine in the pictures, but the front side is different. Is it possible that I can use the rear end of that block with the cylinders and mate it to the front end of mine, eliminating the need to rebore?
I appreciate any advice/suggestions on this project. I know this is a bit long winded, but I wanted let all interested know precisely what it is that I’m dealing with.
Thanks
I have been reading on this forum for several months and would like to post my project and solicit advice from such knowledgeable people. I would also like to document this experience to the benefit of others who would like to attempt a rebuild of a similar engine.
Here is what I’m working with: 1966 100HP Johnson Golden Meteor V4ML-12
Background: This engine was free to me, mounted on a 1963 Lonestar Biscayne. When I started with it, I didn’t even know how an engine worked. So far it has been an incredible learning experience. At this point, from my research on forums and experience in general, I’m generally aware (getting new surprises all the time) of what I’m getting into and the costs involved.
Work so far:
Obtained factory service manual, Rebuilt Carb, Resealed Lower Unit (Type “C” oil), New Throttle Cable, Rebuilt fuel Pump, new fuel lines, changed impeller.
Running Experience So far:
Taken out on the lake twice. Electromatic Shifts Forward and Reverse. Extremely Difficult to cold start. Runs strong at full throttle and stalls out at idle. Used to start easily when warm-difficulty starting seems to have gotten worse over time. Sounds like it is suffering from pre-ignition.
Diagnostics:
Compression Test: Cylinder 1 -90psi, 2-80psi, 3- 85psi, 4-? (Blew tester off, stripping threads spark plug threads)
Spark: Shows Spark in 4 Cylinders.
Where I’m at now: When doing the compression test on cylinder 4 the threads stripped out of the spark plug hole. I pulled the head and the bypass covers on the starboard side. I noted a lot of carbon buildup on both piston heads. There are scores on the piston walls that I can catch a nail on. Bottom side of both pistons show blow-by and scoring on the piston skirts. I haven't yes assessed the port pistons yet.
Plan moving forward: I plan to disassemble the powerhead entirely/removing broken bolts and return it to working condition. Likely over boring cylinders. I am in the process of disassembly now. I've so far obtained a new starboard head and head gaskets. Sound good?
Questions so far: I am attempting to cross reference the parts utilizing the ***************** website. The 1966 part list shows no oversize pistons/rings. The 1967 part list shows .20 oversize pistons (part #0385288). Both blocks are the same updated part number and the standard piston part numbers are the same. Is it safe to assume that these pistons will work in my block?
I’ve found a new Johnson 1965 60hp 060553(part#0382684) block for sale. The back side of the block looks similar to mine in the pictures, but the front side is different. Is it possible that I can use the rear end of that block with the cylinders and mate it to the front end of mine, eliminating the need to rebore?
I appreciate any advice/suggestions on this project. I know this is a bit long winded, but I wanted let all interested know precisely what it is that I’m dealing with.
Thanks
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