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Low hour, low compression motor
#12646634
02/26/18 12:30 AM
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Joined: Feb 2018
Posts: 4
Drobe0711
OP
Green Horn
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OP
Green Horn
Joined: Feb 2018
Posts: 4 |
I am looking at a 2010 boat with a 150 Mercury Optimax. The motor has less than 200 hours on it with over half of that idling/trolling/low rpm. The engine report showed that all cylinders had 95 psi compression. This less than the service manual that say 110 - 130 psi for compression. All the mechanics I have talked too said that since the cylinders were even, that it is ok. Is it more likely for a low hours motor to have low compression/stuck or worn rings or that the test was done cold?
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Re: Low hour, low compression motor
[Re: Drobe0711]
#12646683
02/26/18 12:55 AM
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Joined: Jan 2005
Posts: 16,640
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,640 |
Pat Goff Seadrift TX
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Re: Low hour, low compression motor
[Re: Drobe0711]
#12646843
02/26/18 02:07 AM
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Joined: Jul 2011
Posts: 1,283
Capt. Andrew
Extreme Angler
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Extreme Angler
Joined: Jul 2011
Posts: 1,283 |
I had a motor test at 99lbs with one gauge and 130 with another. As long as they are all around 10% of each other and the motor runs smooth its goo.
http://FishingCharterspi.com/Snook,Redfish,Shark, Red snapper, tarpon Shallow Sport Latitude 27’ Suzuki 300hp South Texas Boat Outfitters (owner) Pure Fishing Prostaff TFO Rods ProStaff.
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Re: Low hour, low compression motor
[Re: Drobe0711]
#12647515
02/26/18 04:24 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 |
Do a carbon cleaning on it.
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: Low hour, low compression motor
[Re: Drobe0711]
#12647608
02/26/18 05:19 PM
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Joined: Apr 2015
Posts: 1,818
Curtbass
Extreme Angler
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Extreme Angler
Joined: Apr 2015
Posts: 1,818 |
Check it usung another gauge just to see if there are different results. Then de carbon motor & do it again. Warm motor up, check with throttle in wide open position, for initial readings then do a leakdown test. A more comprehensive picture of motor health. I would be leery about the lower results but hate to see someone miss a fair deal in a good even motor over a faulty gauge. Ask seller if hes willing to do that. Could benefit both of you. He makes a sale & you make a better purchasing decision.
Last edited by Curtbass; 02/26/18 05:26 PM.
ELITE POWER SYSTEMS/ Elite Fishing Products Lithium Battery & Charging Systems, Soft Plastics, Tackle,Tokyo Rigs Tight lines & stay safe out there.Gods blessings
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Re: Low hour, low compression motor
[Re: Drobe0711]
#12648104
02/26/18 09:50 PM
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Joined: Nov 2002
Posts: 4,439
Gamblinman
TFF Team Angler
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TFF Team Angler
Joined: Nov 2002
Posts: 4,439 |
Along with the above, you need to perform a leak down test to determine the actual condition of cylinder sealing.
Last edited by Gamblinman; 02/26/18 09:51 PM.
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Re: Low hour, low compression motor
[Re: Curtbass]
#12648412
02/27/18 01:24 AM
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Joined: Apr 2015
Posts: 1,818
Curtbass
Extreme Angler
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Extreme Angler
Joined: Apr 2015
Posts: 1,818 |
i mentioned leakdown test also.
ELITE POWER SYSTEMS/ Elite Fishing Products Lithium Battery & Charging Systems, Soft Plastics, Tackle,Tokyo Rigs Tight lines & stay safe out there.Gods blessings
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Re: Low hour, low compression motor
[Re: Drobe0711]
#12649112
02/27/18 02:48 PM
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Joined: Feb 2018
Posts: 4
Drobe0711
OP
Green Horn
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OP
Green Horn
Joined: Feb 2018
Posts: 4 |
Thanks everybody for the suggestions. I was planning on having a leak down test completed when I went to look at the boat. I will ask the current owner if he can have a carbon cleaning done.
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