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#12604671 - 01/31/18 08:28 PM Outboard Question and ISO Mercury
FXfromTx Offline
Angler

Registered: 11/01/16
Posts: 319
Asking question for a family member... 1997 Mercury 115 wouldn't start. Compression check shows top 2 cylinders have compression of 90. If there is a crack between these cylinders only option is a new powerhead, correct?

On that note, rather than spending $3,000 on a powerhead does anybody know of any 75-150HP Mercury outboards for sale?
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"The fishing was good; it was the catching that was bad."

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#12604716 - 01/31/18 08:55 PM Re: Outboard Question and ISO Mercury [Re: FXfromTx]
NITRO Z8 Offline
Pro Angler

Registered: 07/06/07
Posts: 608
Loc: Texas
Call Charlies out board shop in Alvarado and talk to either Charlie, Keith or son and they could tell you what they have and you can bet the engines will be in top shape.

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#12605064 - 02/01/18 08:14 AM Re: Outboard Question and ISO Mercury [Re: FXfromTx]
Gamblinman Offline
TFF Team Angler

Registered: 11/26/02
Posts: 3527
Loc: Yantis, TX
What was the compression of the remaining cylinders and what leads you to think there is a crack between cylinders?

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#12605080 - 02/01/18 08:20 AM Re: Outboard Question and ISO Mercury [Re: FXfromTx]
Pat Goff Online   content
TFF Celebrity

Registered: 01/29/05
Posts: 5941
Loc: Marble Falls/Seadrift
90 is not dead, it's sick.
It could be a simple power tune treatment could bring it back from it's carbon sick bed.
_________________________
Pat Goff
Marble Falls/Seadrift TX



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#12605269 - 02/01/18 10:17 AM Re: Outboard Question and ISO Mercury [Re: FXfromTx]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11452
Loc: Littlefield Tx & Lake A. H. US...
Something is definitely wrong because those motors normally have 140lbs or better.
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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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#12606551 - 02/01/18 11:27 PM Re: Outboard Question and ISO Mercury [Re: FXfromTx]
FXfromTx Offline
Angler

Registered: 11/01/16
Posts: 319
Bottom 2 cylinders are 150lbs. Top 2 were only 90 and the mechanic that looked at it told him chances were it was cracked between the cylinders. Also said tearing it apart to make sure was going to cost more than it was worth, he should just find another mercury motor that will use all of the same controls. I would imagine it could be a bad head gasket, warped piston or something of that sort but the mechanic was sure it was a crack between the top two cylinders since it was those two side-by-side cylinders that had low compression. I'll relay the message and I would imagine he will have another mechanic actually tear it apart and fully diagnose. Thanks everyone!
_________________________
"The fishing was good; it was the catching that was bad."

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#12607162 - 02/02/18 10:59 AM Re: Outboard Question and ISO Mercury [Re: FXfromTx]
Pat Goff Online   content
TFF Celebrity

Registered: 01/29/05
Posts: 5941
Loc: Marble Falls/Seadrift
I would get a second opinion. Cracked block would give a zero compression. Something else is going on.
_________________________
Pat Goff
Marble Falls/Seadrift TX



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#12607397 - 02/02/18 12:48 PM Re: Outboard Question and ISO Mercury [Re: FXfromTx]
Blake's Boats Offline
Angler

Registered: 03/10/10
Posts: 404
Loc: Corsicana, TX
PM sent on 2001 150 XR6 for sale
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Blake's Boats
Corsicana, TX 75110
(903) 872-1292
cell (903) 879-5985
www.blakesboatsales.com

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#12607529 - 02/02/18 01:50 PM Re: Outboard Question and ISO Mercury [Re: FXfromTx]
Pat Goff Online   content
TFF Celebrity

Registered: 01/29/05
Posts: 5941
Loc: Marble Falls/Seadrift
Quick look with a bore scope would end the mystery.
_________________________
Pat Goff
Marble Falls/Seadrift TX



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