Motor:
I have a Johnno 2001 2st 90hp.
Issue/Observation
- When in neutral and push forward on the controls, I hear a 'clunk' where the motor momentarily goes in and out of forward gear (i..e it seems to bounce back to neutral). The 'clunk' is bordering on a 'bang' and is noticeably louder than a normal gear engagement. If I repeat the exercise it will 'clunk' again but will eventually (after one or more tries) go into gear. Once in gear it stays in gear and seems to perform normally right through the rev range.
- No issues with reverse gear.
- Forward gear engages ok on the trailer i.e. prop in air- this happens only when the prop is submerged
Other Factors:
1) I recently noticed an oil leak and had water in the gerbox due to fishing line damaging the seal. I removed the prop and bearing carrier assembly and replaced the seals, O-ring and gerbox oil. There were no metal fragments on the drain plug, the bearings looked in excellent condition and there was no evidence of rust internally. The new oil now looks fine and there is no water ingress or oil leaks post repair. The first time I used the boat post repair this problem was not present. It appeared on the second usage.
2) Immediately prior to this problem emerging I replaced the fuel line and therefore removed the engine cowling and the small cover where the cables enter the outboard. The cables have all been lightly moved/jiggled during this process.
Timeline:
Noticed oil leak - no clunk prior
Replaced gearbox seals - no clunk immediately after (single boat outing - multiple gear engagements)
Replaced fuel line - clunk appeared after
Thanks for reading and all suggestions welcomed.
Iain
I have a Johnno 2001 2st 90hp.
Issue/Observation
- When in neutral and push forward on the controls, I hear a 'clunk' where the motor momentarily goes in and out of forward gear (i..e it seems to bounce back to neutral). The 'clunk' is bordering on a 'bang' and is noticeably louder than a normal gear engagement. If I repeat the exercise it will 'clunk' again but will eventually (after one or more tries) go into gear. Once in gear it stays in gear and seems to perform normally right through the rev range.
- No issues with reverse gear.
- Forward gear engages ok on the trailer i.e. prop in air- this happens only when the prop is submerged
Other Factors:
1) I recently noticed an oil leak and had water in the gerbox due to fishing line damaging the seal. I removed the prop and bearing carrier assembly and replaced the seals, O-ring and gerbox oil. There were no metal fragments on the drain plug, the bearings looked in excellent condition and there was no evidence of rust internally. The new oil now looks fine and there is no water ingress or oil leaks post repair. The first time I used the boat post repair this problem was not present. It appeared on the second usage.
2) Immediately prior to this problem emerging I replaced the fuel line and therefore removed the engine cowling and the small cover where the cables enter the outboard. The cables have all been lightly moved/jiggled during this process.
Timeline:
Noticed oil leak - no clunk prior
Replaced gearbox seals - no clunk immediately after (single boat outing - multiple gear engagements)
Replaced fuel line - clunk appeared after
Thanks for reading and all suggestions welcomed.
Iain
