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greencorn
New member
Username: greencorn
Post Number: 1
Registered: 11-2012
| | Posted on Friday, July 19, 2013 - 06:59 pm: | 
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Can't seem to locate heavy knock in four cylinder marine engine. Tried isolating each cylinder but cannot figure where the sound is coming from. Do two-cycle engines have common main bearing knocks (seems like since pressure is alway downward on the mains it would be unlikely this is the problem)? Checked all rod bearings and wrist pins. |
solarrog
Senior Member
Username: solarrog
Post Number: 546
Registered: 03-2002
| | Posted on Friday, July 19, 2013 - 07:04 pm: |
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Check the coupler to your shaft or transmission |
jim_parrott
Senior Member
Username: jim_parrott
Post Number: 63
Registered: 06-2009
| | Posted on Saturday, July 20, 2013 - 10:59 pm: |
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Often a loose flywheel can be mistaken for internal engine knocks. |
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