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Old 05-27-2015, 09:25 AM   #57
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I know older sport and WWII airplanes have a oil pump that is started before starting the engine. Is there something like that available for trucks? Seems like it would take care of something like that. Start the pump for 2 minutes before starting the engine to lube and build pressure. Then on shut down, automatically run the pump until hitting a target low temp. Turbo would have to be spinning though I guess.
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Old 05-27-2015, 10:59 AM   #58
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EGT monitoring is useful if you are a bit of a diesel nut but never heard of a stock truck equipped with EGT displayed as a part of gage package.

Not disputing the value of turbo cool down time, but it requires an auxiliary gage and probe input. I can monitor EGT on my VW TDI also, aftermarket Gage.

BTW my recent 600 mile or so trip was 12 MPG hand calculated.
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Old 05-27-2015, 09:02 PM   #59
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Ok, gotta jump in here as I'm trying to figure out if I should keep my 1991 300LE, or 1994 Classic 36 Diesel Pusher. I know everything about the 300- 5k on the motor, 60k miles on the rv, and trans rebuild, and I just had the motor rebuilt on the diesel, a 5.9 Cummins 230hp with 55k total miles. If I could combine the two and have a 30' diesel, pusher, I would keep it forever!

Regarding startup and shutdown, I was reading the Cummins manual, and it says if you have not run it in 7 days, you should disconnect the wire from the fuel pump solenoid turn the motor over till you get pressure on the oil gauge or the light goes out, then reconnect the wire and start the motor. I was thinking of installing a switch on the dash, and wonder why the factory did not? Good points on cool down. Anyone leave the motor running when fueling up?
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Old 05-27-2015, 09:41 PM   #60
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Originally Posted by SebasSF View Post
Ok, gotta jump in here as I'm trying to figure out if I should keep my 1991 300LE, or 1994 Classic 36 Diesel Pusher. I know everything about the 300- 5k on the motor, 60k miles on the rv, and trans rebuild, and I just had the motor rebuilt on the diesel, a 5.9 Cummins 230hp with 55k total miles. If I could combine the two and have a 30' diesel, pusher, I would keep it forever!

Regarding startup and shutdown, I was reading the Cummins manual, and it says if you have not run it in 7 days, you should disconnect the wire from the fuel pump solenoid turn the motor over till you get pressure on the oil gauge or the light goes out, then reconnect the wire and start the motor. I was thinking of installing a switch on the dash, and wonder why the factory did not? Good points on cool down. Anyone leave the motor running when fueling up?
If you manage to figure out how to make a 30' diesel pusher please put me down for three of them as I could easily sell them to people that want to buy mine.

As for disabling fuel pump and them cranking motor until oil pressure comes up is sound advice but totally impractical and will result in you buying a few starters.

I wonder if Cummins puts that into the manual in order to disallow warranty claims from RV'ers. Seems a little over kill to me. What's the difference having the engine turn over with no oil pressure, as opposed to starting with no oil pressure? Wouldn't the engine have to turn over the same amount of revolutions?

I do wonder if I could put a remote oiler that would circulate oil around the motor BEFORE start up, using much the same system as aircraft engines used in WWII?

Maybe this?http://www.masterlube.net/home.htm

I have learnt my lesson and prefill the oil filter housing before installation.

Cheers
Tony
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Old 05-27-2015, 11:30 PM   #61
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Good points Tony. I understand that modern cars are designed to turn over several times before they fire up to get some oil moving.
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Old 05-28-2015, 06:50 AM   #62
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Gas vs. Diesel

Radial aircraft engines are susceptible to dry starts. Most of the large ones have pre oilers. Even some R985s (450hp) have them. Watch them start the old war birds in the movies or at air shows and you will see a group of guys pulling several blades through before starting. Even with a pre oil pump. Then they smoke like crazy from oil pooled in the bottom cylinders when they light off.

I use Synthetic oil as I believe it does provide better lubrication during start up especially after sitting longer periods.

I always let it cool down and stabilize at about 350 degrees on the EGT before shutdown. If I pull into a rest area right off the highway I let it idle about 3 minutes. If you have been driving at low power for a bit then less.

How many cracked manifolds or warped heads (blown head gaskets) have you heard of on gas engine? Same issue. I've been dealing with engine cool down periods on small planes, helicopters, jets, piston, and turbine since I started flying.

As far a gauges goes, we live by them on aircraft. If you are driving, or flying, a craft with a computer controlled/monitored engine a check engine light is all you need unless you are a complete dork.

On older engines like we are we are talking about they become more important. Especially in challenging conditions. EGT is probably the most important to keep from damaging an engine. Some are so de tuned that any idiot can stand on the gas on a long grade and they want get too hot.

Other will blow molten aluminum out the exhaust if abuse them. My 95 will run 75 mph all day long on the interstates and you never have to watch. 0 to 28 lbs boots and 600 to 1100 degrees EGT. Water temp sits right at 190 degrees. But take it across the continental divide or a long grade in the desert with a good Wyomin head wind and 100 degrees outside air temp and you better watch things.
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Old 05-28-2015, 07:16 AM   #63
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There is no magic to Diesel engine ,just a little common sense,start then drive easy until temp starts to come up, drive easy before shut down , no magic to it....
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Old 05-28-2015, 08:49 AM   #64
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This is all great information for diesel dummies like myself....thanks fellas
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Old 05-28-2015, 10:09 AM   #65
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There is no magic to Diesel engine ,just a little common sense,.....no magic to it....

That's what makes a Diesel special, the magic. No clue where the common sense is sold though, I think I'm down at least a quart.

I got hooked when I drove a 1997 Dodge 3500 5.9L 5 spd up a grade in 5th, punched it and it pushed me back in the seat.
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