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OK guys
I have a brand new Cummins 4BT 3.3 from Trans Atlantic Diesel with 6.7 hours on it. The oil pressure gauge has gone past the max 80 psi that shows on the gauge since the first start up. I talked to Marcus and he said that he would send me a new sending unit. He did and I installed it almost 10 months later. I didn’t feel like it was important because my list was so long that it didn’t rank very high. After I installed the new unit I had the same readings. He told me to connect a mechanical gauge and I got a reading of 75 psi at idle and 85 psi at 2000 rpm’s. Today he said that these are within normal operating limits. I can’t find a max oil pressure in the manual or online but 85 psi seems excessive to me. Does anyone have any idea if he’s just blowing sunshine up my big ol’ butt or if that’s the right oil pressure.
Linus
Sumocean #34
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I know nothing about engine, but these folks probably do: http://www.4btswaps.com/forum/index.php
-p
s/v Deep Playa | Pearson 424 #152 | http://www.DeepPlaya.com<.. snip>
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Thanks Dawn and Patrick! -
I don't know what the specific oil pressure should be but it will decrease as the hours accumulate. The thing that controls the pressure is the oil pump pressure relief valve – it's that way with all pressurized oil engines.
I think 85psi is probably ok – higher pressure is better than lower especially where small tolerances are involved. A diesel should run a little higher than a gas engine and if you have a turbo ( I think you do) you want as high a pressure as things will stand.
Unless the Cummins people say different, I'd be happy.
Bob
On Thu, Jun 4, 2009 at 6:06 PM, Linus Martinez < ([email][/email])> wrote:
OK guys
I have a brand new Cummins 4BT 3.3 from Trans Atlantic Diesel with 6.7 hours on it. The oil pressure gauge has gone past the max 80 psi that shows on the gauge since the first start up. I talked to Marcus and he said that he would send me a new sending unit. He did and I installed it almost 10 months later. I didn't feel like it was important because my list was so long that it didn't rank very high. After I installed the new unit I had the same readings. He told me to connect a mechanical gauge and I got a reading of 75 psi at idle and 85 psi at 2000 rpm's. Today he said that these are within normal operating limits. I can't find a max oil pressure in the manual or online but 85 psi seems excessive to me. Does anyone have any idea if he's just blowing sunshine up my big ol' butt or if that's the right oil pressure.
Linus
Sumocean #34—
Bob Fine
s/v Pelican
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Rich
I contacted Cummins and they called me back and said that the pressure should be around 80 at idle. He also said that I should have 85 at fast idle. I guess I’m just worried that the gauge only reads to 80 so it is always pegged. I will be looking for another gauge with a different read out.
Linus
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Hugh, why would they provide a gauge that doesn’t have enough range to display oil pressure? Sounds odd to me. I think TAD uses Faria gauges, Eoro-White ( http://faria-instruments.com/marine/styles.php). Faria (and probably others) makes oil pressure gauges that have a 100psi range. Tad’s web site specifically states 80psi oil gauge. I might insist that they provide a free replacement.
This might be a good time to install a fuel level gauge too if you haven’t already done so. You’d have to figure out some way to relocate the engine alarm buzzer and fill in the hole. Maybe a new frontpanel would be needed.
Regards
Rich
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Rich
Believe it or not I have just finished a small panel that I am installing next to the AC cord plug in the cockpit. From the suggestions that I got from the group I will be putting in: fuel gauge, ignition switch, plug for spot light and a switch for the running lights. With room to spare for a remote mic and some other stuff when I think of it.
Linus
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You can’t mention all that cockpit remodel sexiness and not send a picture of it. You’re totally holding out on us! 😉
-p
s/v Deep Playa | Pearson 424 #152 | http://www.DeepPlaya.com<.. snip>
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Thanks Dawn and Patrick! -
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Linus,
Cool! I put the ignition switches (engine power, start, stop) buttons near the drivers right ankle, where the stop pull cable was. When I repowered, I considered relocating the instrument panel to someplace closer to the wheel, perhaps where you’re putting yours. This happens to be one of the best places to sit when underway however. I’d be continually asking crew to move so that I could read the instruments. I sometimes have the same problem with them under the bridgedeck too. Unless you’ve got a clear view and 20/20 vision, you can’t read them there either. Some of the newer boats have fancy binnacles with built in tables and instrument pods. When the 424 was built, they didn’t have that kind of thing.I spent some time trying to dream up some kind of engine instrument pod to place at the wheel, probably beneath each of the engine control levers. I couldn’t come up with anything that wasn’t a lot of work. I ended up putting the new instrument panel in the same place as the old panel. It didn’t fit, so it was a lot of work to cut it down. This is what I’ve got so far. I have room under the right instrument cluster to put some switches. I probably have room for three switches. Running lights would be handy, as wouldnavigation instruments and autopilot. It would be a PIA to rewire the stuff though.
http://www.richardcarter.net/boat/pix/binnacleJPG.jpg
The table is really nice. I think Lee made it. It needs to be refinished however. He used Bristol finish, which looked great for a while but is now crazed. Its some kind of epoxy and doesn’t come off without a lot of effort.
Regards
Rich
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