Boats For Sale:
1995 carb pcm motor no oil pressure |
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KENO 
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Joined: June-06-2004 Location: United States Status: Offline Points: 11118 |
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 Topic: 1995 carb pcm motor no oil pressurePosted: April-16-2021 at 5:36am |
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Funny how one question just leads to another
The temp gauge being slow needs a little better description too .It's always kinda slow since the water has to heat up. Assuming you have a good, functioning thermostat, it should take at least a few minutes to be near normal temp after you start the engine from cold conditions. Or do you mean that you have the boat running with normal oil pressure and water temperature indications and you turn it off then start it again right away and the dash gauges are slow to respond? But.......if you're convinced you have wiring issues check the grounds first since grounds can make things happen that are next to impossible to give a logical explanation for. Crazy wacked out trailer lights that have a mind of their own are a good example of "bad grounds"  That would be the gauge grounds under the dash and each of your sending units grounds itself to the block through the threads. Some people say that they have to be installed with no thread sealer of any kind, others will use a small amount of sealer with no issues |
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Fresno1995
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Joined: October-25-2020 Location: 93720 Status: Offline Points: 6 |
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Posted: April-16-2021 at 3:59am |
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hello ,
had the issue prior and thought it was sending unit due to age . the oil pressure gauge is slow to get pressure. I also changed temp sending unit . it is also slow to get up even with engine running. It has to be in the wiring ? any suggestions . thank You
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Glenn in Fresno
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KENO
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Posted: April-14-2021 at 7:27am |
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Well at least you know you have good oil pressure.
I'm a little unsure if you just put in a new sending unit and had these issues or had the issues and then put in a new sending unit. Do you still have low pressure indicated on the dash gauge?
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Fresno1995
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Posted: April-12-2021 at 1:11am |
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Thank You everyone . I did dump the oil filter and oil and went with Shell Rotella 15-40w with wix filter. Spring has arrived in California and the temps are in the mid 80's and sunny . I borrowed oil filled oil pressure gauge and took off the new oil pressure sending unit and plcaed the tester fitting on the T. Started motor in the lake and had psi of 60 right as I started motor. went down to 40 psi. Glad its not the oil pump . Now the question is, Do i have possible grounding issue?
I am like to learn and tinker, but is this over my head. Any Help would be much appreciated . |
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Glenn in Fresno
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GottaSki
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Posted: November-10-2020 at 9:20am |
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drill *backerds
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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KENO
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Posted: November-10-2020 at 6:32am |
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If you're gonna do the socket and extension on a drill, it's a 1/4 inch drive 5/16 socket and a long 1/4 inch drive extension for your 351.
Somebody will probably come along and tell you that duct taping the pieces together makes about as much sense as those guys that stick a plastic tube in their PCM transmission to pump out the oil. Sometimes it works great, sometimes the results aren't pretty at all You can sacrifice the socket and extension and get them tack welded together or spend 10 or 15 bucks on a priming tool. Somebody else will probably come along and throw out the reminder that on a 351 Ford, you need to run the drill backwards. I think I'd listen to those "somebodies"
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2979 |
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Posted: November-09-2020 at 7:11pm |
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You may want to pull the distributor and run the oil pump with a 1/2 drill. Do that with the key on and you can look at oil pressure on the gauge. Better yet, plumb in a mechanical oil pressure gauge and you can determine if your pump is good or bad. Be sure to secure the socket and extension on the drill. I used some duct tape to keep everything together. Losing a socket in your engine will ruin your weekend. Better yet, use one of these:
https://www.summitracing.com/parts/oes-27062
Do a search on YouTube about priming the oil system with a drill. JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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KENO
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Posted: November-06-2020 at 8:27pm |
I think a little more information would be good here. During that minute or so of no oil pressure, does the engine sound like an old Singer sewing machine, with all kinds of clickety clack lifter noises or is is normal sounding? Did you have it running before the oil change so you know what pressure was with the old oil? Your test gauge will tell you a lot when you run it with that hooked up. Somehow I don't think 0W-40 oil will give you no oil pressure for a minute, then magically go up to 30 #. If it really is zero with the mechanical gauge, then you have other problems. Plenty of people recommending oils which would be good to use after the problem is fixed
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: November-06-2020 at 8:03pm |
Chris, It really wasn't memory but more intuition. I thought to myself, with Chris's mechanical skills, there's no way he would be putting 0 weight oil in his Nautique!!
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SNobsessed
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Posted: November-06-2020 at 7:46pm |
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Pete, you have a great memory!
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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8122pbrainard
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Posted: November-06-2020 at 6:45pm |
Chris, Yes, but if I remember correctly, yours was a ZDDP issue. Glenn's is a ZDDP AND a oil weight issue.
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SNobsessed
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Posted: November-06-2020 at 6:09pm |
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Fresno - You're not alone. I stepped into the oil-pile once too!
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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agetech
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Posted: November-06-2020 at 5:19pm |
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+1 for Rotella 15w40 with ZDDP additive for flat tappet engines, I use it in my '72 GTO too.
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MrMcD
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Posted: November-06-2020 at 1:02pm |
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0-40, wrong for the application.
I run 15-40w Diesel oil, Castrol, Delo or Rotella brand. They still have the ability to protect your old school lifters and camshaft and it is cheap to buy and works well.
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8122pbrainard
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Posted: November-06-2020 at 11:47am |
Great for new engines designed for the 0-40 but NOT good for your 95. Follow the advice above. Do a search on ZDDP to learn more concerning flat tappet engines. Yes, as Gary mentioned, get that 0-40 out before you damage the engine.
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Nautiquehunter
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Posted: November-06-2020 at 11:30am |
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Use Mobil 1 15w50 recommended by Mobil for all flat tappet and roller lifter engines.
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Gary S
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Posted: November-06-2020 at 6:50am |
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I would first get the mobil 0-40 out. Do some oil research on what oil to use in a 26 year old flat tappet camshaft engine. Most run a 15-40 or a 20-50 in engines of that vintage. I have a relatively new car designed to run on 0-40, I have never seen it's oil pressure get over 22 lbs. It's oil pump pressure is controlled by the ECM,yours is not.
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Fresno1995
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Posted: November-06-2020 at 3:27am |
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Hi, New to this . garage find 1995 ski Nautique 300 hours. has not been run for over three years . drained oil and changed filter . filled with new Mobile 1 0-40 . have no pressure for about 1 min. after wards 30 psi . changed sending unit from ski DIM . going to get test gauge . does any one have any other ideas.
thanks Glenn in Fresno
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Glenn in Fresno
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Fresno1995 wrote: