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By RS Disposal · Posted
Looks like the leak is actually coming from under the fitting on top of the injector. Does the just screw of and have copper washers for seal? -
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By Geoff Weeks · Posted
I'll agree with that statement. But the one single thing that draws the most and determines the limits is cranking and to a lesser extent firing of the injectors while cranking. Look at it this way, if cranking a large bore diesel in cold draws the system voltage down to ~6 volts, that has cut the system in 1/2. a 24 volt system that looses 6 volts while cranking is still at 18 volts. It is all about getting the truck running, once that is done, the alternator carries the load. You can afford to loose 6 volts with a 24 volt system, you can not with a 12. Injector firing is done at a much higher voltage on the new trucks, then system voltage. If the system is pulled too low it can't even fire the injector even if the engine is cranking fast enough to start. It is becoming more and more common on newer vehicles to have charging voltage controlled by the ECM in order to quickly replace what was drawn off when the vehicle was shut down. Storage batteries (common lead acid types) can provide small amounts of current for a long time but are extremely limited in how large a current draw they can provide for even a short time. It isn't a liner graph. A Maxwell supercapacitor can provide enough current to start a big bore diesel in -25F in the form factor of one Gp 31 battery, but can be totally depleted in 25-35 min by connecting a single headlight across it. It is the opposite of a battery, the Maxwell can supply huge amounts of current for a short period. It does not store more energy than even a single group 31, but can release it all at once. This is proven by the fact a single gp 31 can recharge the Maxwell multiple times (charging current for the Maxwell is less than 18 amps) Key off loads could be handled by 4 lead acid batteries in parallel and carry that load for a week or more, but not be able to crank the engine in the cold because the current draw exceeds the ability of the battery to provide, either provide more, or reduce the current needed. doubling the voltage cuts the current in 1/2. doubling the voltage does not increase the total capacity in watt/hrs of the system. You are still storing the same amount of energy, but can better access the stored energy when a brief large draw is on the system. I don't claim to be schooled on the latest, but the laws of chemistry and physics don't change. I do have an fair but by no means complete understanding of the modern systems on vehicles. I am by no means an expert. By raising the voltage, you are reducing the current required, and current is the limiting factor. Once the truck is running the charging system supplies not only the current to keep it running but also the current to replace what was used to start. -
I may be calling it the wrong name, but basically more computing needs more power. Not to be a wise guy, but I think you might be surprised at how many systems and subsystems are actually on these new trucks (it's nuts) There's so much on new stuff, they're shipped with a lot of things in a "dormant" state so as not to drain batteries. Dealers aren't even aware of some of the things that need to be activated when the customer takes delivery of a new piece of equipment ( all $300,000.00 of it ) . In some cases, technitions don't even know what's wrong when the customer comes back complaining. In some cases it turns out just something that wasn't toggled on before delivery. They're not done yet either. They're just gonna get more and more complicated, and support is gonna be worse and worse. You'd fall over if you saw some of the prices for something as simple as what was once a headlight. What was a 30 amp breaker is now 4 processors working in conjunction with 6 other ones. -
I bet Its a double walled plastic line. Look at E-tech return line...
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By Straydog954 · Posted
Hello everybody I’m looking at some older Macks and wondered which engine was more reliable and would give fewer problems. I’ve read that the AMI 370 is the better of the aset engines. Should I focus on the gray engine or look at the MP7 although it would have the dpf ? Anybody ever owned both ? -
By Geoff Weeks · Posted
I think you are confusing analog DC , where the only choice is "what is the voltage" and digital where a unique identifying pulsed square wave is placed on the buss. The individual modules respond to only their "query" on the buss. Like an old fashion party line telephone. These systems run on much lower voltage then the rest of the "normal" vehicle electrical system. It is the same way someone can be streaming a movie on their computer while someone else in the same house can be listening to music stream, while a third is downloading a program, all on a single modem. the signals get sorted not by voltage but by digital identifier.
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- I double sticked and old Mack to feed a stone crusher in 12 and 14 hour shifts six days a week all summer to pay for my chemistry degree.· 0 replies
- Because I wanted to sleep for 1 min and 26 seconds each trip out of the quarry at the crusher's vibratory dump box at the top the quarry during those 12 hour shifts, I bulled the old MACK up long 20 degree and sometimes steeper grades.
- THAT meant that I split each gear 1, 2, 3 after coming out of boggy low.
- All I did was rev to the right engine note, reach my left arm down through the steering wheel to hold the curve I was on or hold the truck's path steady; slip out of 1st, throw the 2nd stick high into low and slip into 2nd gear... rev to the right engine pitch, slip to high.
- Then when it was time, reach through the wheel again, slip high to low and 2nd to 3rd {if I correctly remember 60 years ago}.
- The Igneous rocks were too heavy and the grade too steep for me to ever get into 3rd high.
- The crusher team were the mechanics for everything and had replaced the old Mack's tranny gears because they had been ground too much. - - They later told me they didn't believe me when I told them I slipped all my shifts because the gears showed no wear.
- Except for start and stop; Not once did I use the clutch because that made my leg ache too much after an hour or so.
- I slipped all my standard 4 speed shift vehicles all my life...just to be with the music of the engine and car or truck.
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- I hardly ever change disc pads or brake shoes because I always slipped my gears downshifting...· 0 replies
_ I learned that because the synchro rings got shot on my 1968 Volvo 122S 2-Door 4-Speed with an electric overdrive because I stupidly speed shifted and ruined them. https://bringatrailer.com/listing/1968-volvo-122s-17/
- [Note: That Volvo's original owner was a Canadian Submarine Captain who rallied it and that is why it had Volvo's unique electric overdrive.]
- {I clear coated over the bone white with Cadillac Firemist Green and painted the grills Black because they were dented...gosh it was stunning.}
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