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 1989 johnson GT 150 strange noise?
#6343156
06/28/11 03:33 AM
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Joined: Feb 2011
Posts: 15
jakecarpenter
OP
Green Horn
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OP
Green Horn
Joined: Feb 2011
Posts: 15 |
My 150 johnson has started something new and I was wondering if any of y'all had any ideas. This problem only happens every once in a while but it still concerns me. When i am idling in gear the rpms will suddenly fall from around 1000 to 500 and the motor sounds real quiet then when I throttle up it sounds like my lower unit smacks a rock then the rpms come up and it runs great. The only thing I have changed since this started was the prop. Thanks for the help.
Amazing Grace
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 Re: 1989 johnson GT 150 strange noise?
[Re: jakecarpenter]
#6343272
06/28/11 04:19 AM
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Joined: Sep 2008
Posts: 121,182
hopalong
Pescador Loco
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Pescador Loco
Joined: Sep 2008
Posts: 121,182 |
do you have the right thrust washer on it?
are you shifting when it makes the noise or is it already in gear?
gear lube in lower been changed lately, water in the lower?
" Hop, set the hook"!
hopalong 99,999
TexDawg 99,999
FJB! not my president by a long shot!
lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
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Re: 1989 johnson GT 150 strange noise?
[Re: hopalong]
#6343680
06/28/11 12:23 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: 1989 johnson GT 150 strange noise?
[Re: gary purdy]
#6356930
07/01/11 09:44 PM
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Joined: Mar 2010
Posts: 1,488
Randy Harrell
Extreme Angler
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Extreme Angler
Joined: Mar 2010
Posts: 1,488 |
I have a friend of mine that has a 97 or 98 Mercury 200 EFI. When he puts it in forward gear it will idle 10 or 15 ft or so and then he will get the same sound. It sounds like it hits a rock or something. It does not do it any other time including reverse. He asked me what I thought and I told him what Mr. Purdy said, "probably not good".
Set the hook first, ask questions later!!!
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Re: 1989 johnson GT 150 strange noise?
[Re: Randy Harrell]
#6358421
07/02/11 02:03 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
Can be a bearing anywhere in the lower unit trying to seize. Most likly the top main shaft bearing. I would think he has checked the prop. Had a guy change his prop, started the motor and broke the back off of the lower. Carrier was sticking out.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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