11985 70 hp Johnson # 1 cyl. not firing with loud tap tap tap...

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Phil Pickard

Recruit
Joined
Aug 21, 2006
Messages
1
I replaced the head gasket on my 85, 70 hp johnson outboard because of water trace on spark #1 plug and slight tapping noise. While I had the head off I noticed the piston was loose in the cylinder. Now, no water but LOUD tapping and power loss (not firing all the time) Anyway, need some advise. Is it worth replacing the piston? can I do just 1? Need some help with finding a manual if this is what I need to do. Thanks a bunch,
Lake Murray Phil
 
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imported_lorin

Petty Officer 2nd Class
Joined
Jun 23, 2006
Messages
199
Re: 11985 70 hp Johnson # 1 cyl. not firing with loud tap tap tap...

If the piston was loose and you have a loud tapping then you may have a baad connecting rod bearing. You need to completely disassemble the powerhead to replace a piston and/or replace the bearing. And if the bearing is bad due to water damage, then the crank journal (where the bearing sits) is probably damaged also.
 
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