Oil Pressure
Printed From: CorrectCraftFan.com
Category: General Correct Craft Discussion
Forum Name: General Discussion
Forum Discription: Anything Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=506
Printed Date: December-02-2024 at 4:30pm
Topic: Oil Pressure
Posted By: yellowdog
Subject: Oil Pressure
Date Posted: June-14-2004 at 7:48pm
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Okay guys, need some help or maybe just reassurance.
The 351W has 840 hours on it. Oil pressure at start up is 40+; at warm up in neutral 40; in gear at idle and warm drops to 15 - 20. As soon as it gets any throttle, increases to 40+. Swapped out gauges over the winter. Honestly cannot recall what the old gauge read in these conditions and po does not have a clue. Have tried a couple of new gauges (happen to have 'a source') all read the same. Had big block mopars many moons ago that did the same thing and a couple of old TR-6's that have done this all their lives. Is this common, or am I looking at an oil pump replacement. Thanks, Don ------------- Caretaker of the wife's '78 Ski Nautique |
Replies:
Posted By: Tribal150
Date Posted: June-14-2004 at 11:37pm
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My motor does the same thing in my 76, so doe my friends in his 73, I have not noticed any issues with this.
Rob ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=796&sort=Year&pagenum=2&yrstart=1976&yrend=1976 - 1976 Ski Nautique |
Posted By: Jamie
Date Posted: June-15-2004 at 12:16am
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As oil warms, it becomes thinner, therefore less pressure is indicated when a warm engine is at idle. As a warm engine comes up in rpm, the pressure raises to indicate proper pressure. This is normal. You should start to worry when the oil pressure does not go up to 40psi under increasing rpms. ------------- 1968 SN 1548 |
Posted By: yellowdog
Date Posted: June-15-2004 at 10:57am
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Thanks guys, like I said, mostly looking for reassurance.
Don ------------- Caretaker of the wife's '78 Ski Nautique |
Posted By: SS 201
Date Posted: June-15-2004 at 7:23pm
| Rule of the thumb, 10 lbs for every 1000 rpm turned. |
Posted By: 79nautique
Date Posted: June-15-2004 at 8:20pm
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Don,
The oil pump could be getting a little worn on the thrust plate so when your re-painting the haul and re-doing the interior this winter you could rebuild the oil pump and get it back up to normal. I was able to pull the oil pan off mine with out taking the engine out last year. all you have to do is unbolt the pick-up tube after dropping down the pan and it will come right out. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique |
Posted By: yellowdog
Date Posted: June-16-2004 at 1:34am
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Hey '79, give a guy a break! You're starting to sound like my wife; "as long as you are doing that, add this to the list."
Seriously, I had put that on my list of things to do this fall. If it that easy to do, I might move it up to the next oil change on a rainy weekend. What am I saying? It NEVER rains in NE Indiana. Like the guy on the radio said this morning, 'it only rained twice last week, once for 3 days and once for 4!' At least we live on a hill. . . . . Again, thanks to all. ------------- Caretaker of the wife's '78 Ski Nautique |
Posted By: yellowdog
Date Posted: August-11-2004 at 5:18pm
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In the 'for what it's worth column':
Finally went out and picked up a mechanical guage. For some reason way beyond anything I will ever understand, I actually read the instructions! There was a section talking about electrcal sending units and how sensitive the grounding is on them. Things like pipe sealer and teflon tape interfere with the ground and will give low readings. Looked at the engine and sure enough, the original sending unit was wrapped in about 5 miles of t-tape. Removed the tape and readings returned to 40 psi at idle when hot. Installed the new guage under the motor box anyway, sort of a belt and suspender thing. Both guages read the same, how about that! ------------- Caretaker of the wife's '78 Ski Nautique |
Posted By: kenny g
Date Posted: August-11-2004 at 6:01pm
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i learn something new everyday on this site.
no dope or t-tape on the sending unit.got it. thanks yellerdog !  ------------- kenny g |
Posted By: Rick
Date Posted: August-11-2004 at 11:50pm
That was easy and now you don't have to rebuild it so you have more time for your "Honey Do" list. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=250&yrstart=1996&yrend=2000%20" rel="nofollow - 2000 Ski |
Posted By: yellowdog
Date Posted: August-13-2004 at 6:35pm
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Hey Rick, you are starting to sound lilke the wife! YIKES! ------------- Caretaker of the wife's '78 Ski Nautique |