At idle one of my Detroits is only showing 3 to 5 lbs oil pressure. Once I increase the rpm's it increases to 45 lbs. Need help finding a 2 cycle Detroit guy in the Boca Raton-Delray Beach area. Most guys will travel. Would appreciate some advice or referrals for a Detroit mechanic on the East Coast of Florida.
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Help for Detroit 8V71Tis Low oil pressure at idle
Tomrealest@aol.com
Needs, Wants & Desires
1978 58 Hatteras Yachtfish
SEA 21
1974 46C #313 Hatteras Convertible
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Re: Help for Detroit 8V71Tis Low oil pressure at idle
What did it used to show? It isn't that unusual for DDs to have low oil pressure at idle when hot. Is this a big change?
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Re: Help for Detroit 8V71Tis Low oil pressure at idle
Mechanical gauge? If not, put a mechanical on there to make sure the reading is correct.
Sky Cheney
1985 53EDMY, Hull #CN759, "Rebecca"
ELYC on White Lake--Montague, MI
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Re: Help for Detroit 8V71Tis Low oil pressure at idle
Those gauges fail all the time. My transmission gauges showed 180 and 220 PSI. I added mechanical gauges directly in the the engine rooms. Both read 125 PSI. Right where it’s supposed to be.
SEVEN
1979 53' MY Hull #563
Antioch, California
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05-21-2019 08:54 PM #5
Re: Help for Detroit 8V71Tis Low oil pressure at idle
5 PSI is not abnormal at idle with warm oil. Here is one of many posts on boat diesel regarding that
https://boatdiesel.com/Forums/index....&Search=2&SR=1
I'm not telling you everything is OK cause I don't want to be part of ruining your engine but I think if its getting 45 psi at higher RPM you should be ok. A mechanic could tell you for sure. I know my 12V71's run pretty low at idle with warm oil
Also are you running straight 40 weight oil? If your oil is too thin that may make pressure lower. Also you may want to have an oil analysis for fuel dilutionLast edited by Briankinley2004; 05-21-2019 at 08:56 PM.
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Re: Help for Detroit 8V71Tis Low oil pressure at idle
Oil was changed 20 hours ago with Detroit 40 weight oil. I don't remember it being so low but can't honestly say I remember.
This was with a mechanical gauge in the engine room. Will try with a new gauge.
Appreciate the help.Tomrealest@aol.com
Needs, Wants & Desires
1978 58 Hatteras Yachtfish
SEA 21
1974 46C #313 Hatteras Convertible
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Re: Help for Detroit 8V71Tis Low oil pressure at idle
Wouldn’t the alarm go off if the pressure was really that low?
Mahalo V
1974 53 Motoryacht
Hull Number 406
San Diego, Ca. Ready 32 Nordic Tug, Brunswick Ga.
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05-21-2019 11:37 PM #8
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Re: Help for Detroit 8V71Tis Low oil pressure at idle
Mine will "ring the bell" with hot oil if I go into reverse with too much way on - 5 knots or so.
The manual says it's normal."The older I get, the faster I was......."
1979 60C "Ohana" hull# 331
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05-22-2019 12:14 PM #10
Re: Help for Detroit 8V71Tis Low oil pressure at idle
"The only thing that always works on an old boat is the owner" - Some Wise Guy
1976 46' Convertible
Old Fort Bayou
Ocean Springs, Mississippi