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#11060408 - 08/24/15 09:34 AM Mariner 40hp Problems
cerda12 Offline
Outdoorsman

Registered: 06/01/15
Posts: 36
Loc: Austin, Tx
So I just my first boat, a 1986 Alumacraft Side Console with a 40 hp motor. Boat wasn't running when I first got it so did a basic tune up to get it going. First time on the water it started up fine but would only go about 3mph, if I gave it anymore throttle it would make a grinding noise. It would sound like it was ready to move but not go anywhere. I'm not sure if this is a problem in the lower unit or not but wanted to see if anyone on here had any ideas before taking it somewhere. I know the motor is going up to 30 years old so it could be coming to the end. Any advise is appreciated. Thank you.

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#11060906 - 08/24/15 01:41 PM Re: Mariner 40hp Problems [Re: cerda12]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10642
Loc: Littlefield Tx & Lake A. H. US...
Where are you. Could check if needed. I know where a complete good motor is difference is it is a 1989.
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“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#11060917 - 08/24/15 01:47 PM Re: Mariner 40hp Problems [Re: cerda12]
cerda12 Offline
Outdoorsman

Registered: 06/01/15
Posts: 36
Loc: Austin, Tx
I would take you up on checking it out but I'm in Austin.

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#11061029 - 08/24/15 03:02 PM Re: Mariner 40hp Problems [Re: cerda12]
HoustonCatfisher Offline
Outdoorsman

Registered: 01/31/14
Posts: 169
Loc: Houston, Texas
Sounds like the lower unit may be shot.
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Licensed Texas freshwater fishing guide

http://houstoncatfish.webs.com

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#11061073 - 08/24/15 03:21 PM Re: Mariner 40hp Problems [Re: cerda12]
cerda12 Offline
Outdoorsman

Registered: 06/01/15
Posts: 36
Loc: Austin, Tx
That's what I was starting to think also. How would I know this for sure?

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#11061778 - 08/24/15 09:20 PM Re: Mariner 40hp Problems [Re: cerda12]
sbump26 Offline
Extreme Angler

Registered: 03/10/04
Posts: 1867
Loc: Arlington, TX
Maybe shift linkage adjustment?
_________________________
Put the plug in.

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#11062243 - 08/25/15 08:31 AM Re: Mariner 40hp Problems [Re: cerda12]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10642
Loc: Littlefield Tx & Lake A. H. US...
Check the lower oil magnet
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#11062311 - 08/25/15 08:58 AM Re: Mariner 40hp Problems [Re: cerda12]
cerda12 Offline
Outdoorsman

Registered: 06/01/15
Posts: 36
Loc: Austin, Tx
I have also read where people have similar problems and they just adjusted the shift linkage, but I'm not to sure which linkage is actually being talked about.

Gary, are you saying to check for metal in the oil?

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#11063823 - 08/25/15 08:29 PM Re: Mariner 40hp Problems [Re: cerda12]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10642
Loc: Littlefield Tx & Lake A. H. US...
Yes
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#11064017 - 08/25/15 09:33 PM Re: Mariner 40hp Problems [Re: cerda12]
cerda12 Offline
Outdoorsman

Registered: 06/01/15
Posts: 36
Loc: Austin, Tx
There was a decent amount of metal shavings but no chips or flakes. I did this the night before going out.

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#11064045 - 08/25/15 09:46 PM Re: Mariner 40hp Problems [Re: cerda12]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10642
Loc: Littlefield Tx & Lake A. H. US...
To eliminate the lower unit it will be necessary to remove the lower unit.
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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