Engine Oil
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=4672
Printed Date: May-13-2024 at 10:07am
Topic: Engine Oil
Posted By: 1998Nautique
Subject: Engine Oil
Date Posted: August-30-2006 at 8:05pm
What kind of oil should I run in my GT-40, to increase the oil pressure? And how many Liters does it take.
Thank You
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Replies:
Posted By: 79nautique
Date Posted: August-30-2006 at 9:15pm
if you have low oil pressure heavier weight oil is only a band aid so 20w50or straight 40w 5 qts with filter will help maybe maybe not, usually it's time for a rebuild when low pressure show up.
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http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique
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Posted By: 1998Nautique
Date Posted: August-30-2006 at 9:38pm
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The Motor has 100 hours on a rebulid. The Pressure runs around 40 when running. And when hot it runs down 15 while idleing.
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Posted By: delhidream
Date Posted: August-30-2006 at 10:00pm
Posted By: stang72
Date Posted: August-30-2006 at 11:04pm
Does the sending unit have teflon tape wrapped on the threads? If so...rewrap so only the top threads have wrap...might not be getting a good connection...and effecting a good reading.When the rebuild took place...was the sending unit replaced? Maybe with an auto version...they won't read the same.
Straight wieght 30 or 40 will increase pressure a bit and if you a quart low you will see some drop.
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stang
Face plants are not that funny when it's you face!
http://www.correctcraftfan.com/diaries/images/3720/photo1.jpg" rel="nofollow - The Super Air
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Posted By: jimbo
Date Posted: August-31-2006 at 12:04am
From experience, the automotive sending unit will read basicly nothing or be topped out.
Was the oil pump replaced during the rebuild? Journal bearing? Or just the heads? Check with the rebuilder.
15 psi at idle and 45 psi underway may be about all you can expect from a Ford.
SAE 40 should give you the highest preasure. Just let it idle until it get up to temperature before puting the coal to it.
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Posted By: 79nautique
Date Posted: August-31-2006 at 11:57pm
Teflon or automotive suggestion above are very possible as well as a low idle. But something could also be wrong else where,read Joe's problems, Not uncommon to loose oil pressure on a fresh rebuild and have to tear it down again, double check just don't hurt the motor if every thing else is in order, better taking it apart. Oil's not going to fix a pressure problem on a fresh motor.
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http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique
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Posted By: mark914
Date Posted: September-01-2006 at 12:49pm
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You have to verify what the actual pressure is first. The only way to do this is with a mechanical test guage. You should never diagnose possible engine problems with the onboard guages.
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Posted By: nuttyskier2002
Date Posted: September-01-2006 at 11:28pm
I second the above statement!
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95 Malibu Echelon w/Mercruiser 350 Magnum Skier
Former boats:
88 Ski Centurion Tru Trac II
59 Chris Craft Capri (woody)
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Posted By: boat dr
Date Posted: September-03-2006 at 10:53pm
i agree w/manual guage to check the true psi reading,as far as normal ford oil pressure,15 psi is not normal at idle.worn or incorrectly installed cam bearings are the bastard child of oil pressure.Oil pressure -hot@2000 rpm's40-60 lb's for a 302,40-65 lb's for the 351. Autometer makes a full manual guage w/20' of tubing,Sumitt, for about 75.00 bucks.you can kill two birds w/one stone.mt stroker has one,she shows 65 lb's cold idle,with 55lbs hot,15/40 Rotella. Ask your rebuilder about cam bearings and his clean work habits,did he build it on the floor?????
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boat dr
/diaries/details.asp?ID=4631 - 1949 Dart
/diaries/details.asp?ID=1533 - 1964 American Skier
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