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RE: TPMS - lock nuts on caps?
I don't want to fool around with extension tubes.
I was able to reach in through the gaps in my hubs to attach the sensor caps without the jam nuts.
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maillemaker
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08/01/21 12:34pm |
Tech Issues
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RE: TPMS - lock nuts on caps?
This is the unit:
https://smile.amazon.com/gp/product/B07QNV8T31
You will have to watch their little video to see the nuts (more properly "jam nuts"). It's at the 4:38 mark.
Basically, you thread a small nut onto the valve stem, then screw on the sensor cap, then use a wrench to back off the jam nut until it binds against the bottom of the sensor cap. This locks the nut and sensor to the stem. In order to remove the sensor cap, you must first loosen the jam nut with a wrench.
On my rear dualies, it's impossible to get a wrench (or your hand) through the wheel cutout to work a wrench against the jam nut.
I thought about going to a tire shop and having them unmount the outside wheel and install the sensor on the inside and then put it all back together, but then if I ever need to add air I can't as I can't remove the sensor.
Based on what I'm reading here the jam nut is just anti-theft so today I'm going to install the caps with no jam nuts.
https://en.wikipedia.org/wiki/Jam_nut
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maillemaker
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07/31/21 09:18am |
Tech Issues
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RE: TPMS - lock nuts on caps?
OK the consensus seems to be these are just anti-theft to make them difficult to remove without a tool. I'm going to ditch the lock nuts.
I don't think these things are high-theft. The entire unit with 6 sensors only cost about $120 or so.
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maillemaker
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07/30/21 10:35am |
Tech Issues
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TPMS - lock nuts on caps?
I purchased a TPMS system for my RV.
The sensors are screw-on caps. Not flow-through. When you install them, they come with a lock nut you are to tighten up against the sensor cap.
The problem here is on my dualies I cannot get a wrench in there to secure the lock nut. The other problem is you can't add air while the cap is in place, so it would be impossible to remove the inner dually sensors to ever add air if needed.
Is the lock nut really needed? Is this an anti-theft mechanism or is there an actual danger of the cap unscrewing?
Worst case is I guess you lose a cap, or it loosens and you slowly leak air (which you would then detect).
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maillemaker
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07/28/21 11:11am |
Tech Issues
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RE: levelers
We like our levelers for more than just the ease of leveling. The stability they provide so we're not rocking and rolling when one of us moves around is also important to us. We park on too many sites that require significant leveling with little option for moving around to find a level spot to want to go back to blocks for leveling. We did that years ago with a 21' Class C, but never again...
I agree. To me, the biggest benefit to leveling jacks is that the coach becomes rock-solid when they are down. No bouncing around on the suspension!
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maillemaker
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07/28/21 10:58am |
Class C Motorhomes
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RE: Fresh Water Drain
Just purchased a 2021 Gulf Stream Class C Conquest 6250D. Does anyone know if there is a specific drain for the fresh water tank or do I need to just run it dry with the pump? My Class A has a large valve that will drain the tank itself but I have been unable to find one on this. It has low point drains but they likely will only drain what is in the lines and then I would need to run the pump anyway - wouldn't I? It was winterized at the factory and now I need to clear the tank and the lines.
My 1990 Winnebago Warrior has 4 low-point drains. If you open them all and open your faucets the entire system will drain, tanks, lines, and all. No need to run the pump.
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maillemaker
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05/27/21 08:12am |
Tech Issues
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RE: Vapor lock 1990 E350 EFI 460 engine?
Just to let folks know how this ended up.
The root of the problem is a failure of the in-tank fuel pump.
I did not think to check it, because I had replaced it just a few years ago.
These early 1990s vehicles were early transitions from carbureted engines to fuel-injected engines. The small in-tank pump was not sufficient to push the fuel up to ~40 PSI needed for fuel injection, so they simply added a high pressure pump in the circuit. The high pressure pump is mounted on the frame rail under the driver's seat.
The way the system works is this: The in-tank pump pumps fuel out of the fuel tank towards the high-pressure pump, which then boosts the pressure up to around 40 PSI to the fuel rail on the engine. The injectors drink what they need to supply the engine at any given throttle/RPM, and the excess fuel not used by the engine is routed back on a return line back into the fuel tank.
When the in-tank pump fails, the high pressure pump is strong enough to suck fuel all the way from the back of the vehicle, through the dead pump, and run just fine - under most conditions.
However, I installed a thermocouple sensor on the return fuel rail just as it leaves the engine compartment. On a hot day, that sensor was reading about 125F. If you stopped the vehicle and sat for 10 minutes, that sensor would run as high as 145F. After you start the engine and fuel gets flowing through the line again, it quickly drops back to around 125F.
I used an infrared thermometer to read the temperature of the fuel tank itself after extended (hours) running at interstate speeds. The tank wall was reading about 110F.
Here is what I believe is happening:
Ethanol-based gasoline starts to boil at around 175F. The boiling temperature of liquids is directly depended on ambient pressure. This is why it is hard to heat water hot enough to cook with on top of Mt. Everest - water there boils at only 154F. This is because the air pressure there is only 4.89 PSI as opposed to around 16 PSI at sea level.
When the in-tank pump dies, the high-pressure boost pump is sucking hot fuel through about 4-5 feet of fuel line, and a dead pump. Since the high-pressure pump is pushing 40 PSI downstream, it is capable of sucking that much from upstream. We can't be sure exactly how much resistance there is to suction so we can't be sure what the actual pressure differential is. But my suspicion is that the high-pressure pump is causing enough of a pressure drop in the upstream fuel line that the fuel there boils. Once it boils, the high-pressure pump cavitates and can no longer pump any fuel. With the engine off for about 20-30 minutes, the fuel cools enough to turn liquid again, and the engine will again run until the situation repeats.
You will see this with a very low PSI reading on the fuel rail. When I finally caught it in the act, I was reading around 11 PSI or less. Less than 20 PSI and the engine won't run much, if at all.
I ended up installing digital ammeters to both the high-pressure and in-tank fuel pumps, with readouts in the cab, so that I can monitor the current draw of each pump independently. I also have installed a digital fuel pressure gauge which picks up from a sending unit on the fuel rail.
Ultimately, the Airtex pump I had replace five years ago had died. When we got it out of the vehicle and I disassembled it, one of the brushes was gone, and the other was just a tiny nub. We replaced it with another Airtex pump, and I still had erratic running.
I finally located a new old stock Motorcraft fuel pump. This completely fixed the problem. Not only that, but because the sending unit was properly calibrated for my tank, my fuel gauge read correctly once again.
This problem is very hard to diagnose because the high-pressure pump completely masks the problem until extended operation at high temperatures. High temperatures with short-distance driving won't trigger the problem. If it's cold out, you may never see the problem (although I finally did catch it with the digital fuel pressure gauge in the middle of winter, with snow at one leg of the journey, after an 11-hour drive from Virginia to Alabama).
Because of the highly intermittent nature of the problem, very few complaints of this nature you find on the internet end up being resolved. Although, I have found a few posts after more intense searching where others have found this same root cause.
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maillemaker
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04/26/21 08:59am |
Tech Issues
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So are there any decent 1141 replacement LEDs these days?
About 5 years or so ago I bought one of those cheap-o twenty-count boxes of LED lightbulbs for interior RV fixtures. 1141 bayonet base style.
They look kind of like this:
https://smile.amazon.com/JAVR-10-3000K-Replacement-Interior-Lighting/dp/B071G5Q643
They worked OK to start with, but very quickly they started giving off an electrical/ozone kind of smell, and individual LED banks on the bulbs started flickering and eventually burning out. Most of them still work but are partially burned out to one degree or another.
I'd like to buy some more and I hope that over the years they have gotten better, but reading Amazon reviews many are still experiencing similar problems.
Then, too, it's hard to trust online reviews today with all the fake padding of reviews going on.
This one seems highly rated:
https://smile.amazon.com/Antline-20-Packs-Replacement-Trailer-Interior/dp/B08DFGSHG2
Can anyone suggest quality 1141 LED replacements?
Thanks,
Steve
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maillemaker
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04/26/21 07:15am |
Tech Issues
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