redbrass_ca
Recruit
- Joined
- Dec 31, 2011
- Messages
- 4
Happy New Year to the members of the forum
I came upon this forum while working on 1976 Johnson Evinrude 20 HP.
This summer I acquired two old outboards full of parts. The most promissing was the 1976 20 HP evinrude. The outboard came in a variety of boxes as it was partly disassembled. The project was started back this summer and it has been long and tidious at times as the engine was stored for many years. After managing to remove the engine from the lower unit I noticed that the exhaust restrictor was partly melted ( see attached photo). I suspect there must have been an overheating problem. The engine block is the next part of the project. It is not seized.
I hoping to have the engine fully restored to fit on a transom of a 14 foot zodiac
I would like to know the importance of the role of the restrictor. What would be the outcome if it was not replaced (left out)?
Why is it made of plastic and not copper or aluminum?
Second question.
Some of the rubberized mount(vibration dampers) in some cases are cracking and delaminating. I believe most are now obsolete. How to make sure a mount is worth putting back on? How much flexibility should they have?
Third question.
Is "Never Seeze" a good choice when reassembling the outboard. The tare down process was very frustrating at times because various bolts sheared inside the casting threads which required drilling and re-tapping.
Can this 20 HP made easily into 25 HP?
Any advice would be appreciated
Terry
I came upon this forum while working on 1976 Johnson Evinrude 20 HP.
This summer I acquired two old outboards full of parts. The most promissing was the 1976 20 HP evinrude. The outboard came in a variety of boxes as it was partly disassembled. The project was started back this summer and it has been long and tidious at times as the engine was stored for many years. After managing to remove the engine from the lower unit I noticed that the exhaust restrictor was partly melted ( see attached photo). I suspect there must have been an overheating problem. The engine block is the next part of the project. It is not seized.
I hoping to have the engine fully restored to fit on a transom of a 14 foot zodiac
I would like to know the importance of the role of the restrictor. What would be the outcome if it was not replaced (left out)?
Why is it made of plastic and not copper or aluminum?
Second question.
Some of the rubberized mount(vibration dampers) in some cases are cracking and delaminating. I believe most are now obsolete. How to make sure a mount is worth putting back on? How much flexibility should they have?
Third question.
Is "Never Seeze" a good choice when reassembling the outboard. The tare down process was very frustrating at times because various bolts sheared inside the casting threads which required drilling and re-tapping.
Can this 20 HP made easily into 25 HP?
Any advice would be appreciated
Terry
