#garfield Logs

Jun 13 2023

12:05 AM rue_mohr: ugh, water pumps are less than $60 not much point in rebuilding it
12:16 AM rue_mohr: and its got the most crazy custom bearing
06:46 PM rue_mohr: so, sometimes, its just the fan belt
06:46 PM rue_mohr: case in point, this case.
06:46 PM Tom_L: ?
06:46 PM rue_mohr: the engine squeek
06:46 PM Tom_L: yeah i thought you used soap on it...
06:47 PM Tom_L: that always works for me
06:47 PM Tom_L: on the underside of the belt
06:47 PM rue_mohr: I did, it was "worn out"
06:47 PM Tom_L: ok
06:47 PM rue_mohr: I didn't think those flat belts did that like that
06:47 PM rue_mohr: just screaming
06:47 PM Tom_L: they wear like anything else
06:47 PM rue_mohr: all the pullies were crazy hot
06:48 PM rue_mohr: yes, but visually, it looks fine
06:48 PM Tom_L: hope you didn't bake the grease out of the idler
06:48 PM rue_mohr: its metal
06:49 PM rue_mohr: :] 3 burns on fingers forcing the belt around so I could get the part number
07:18 PM Tom_L: parts store didn't know?
07:20 PM rue_shop5: so many options, I just wanted to give them the number and get the belt
07:21 PM rue_shop5: first store didn't have it and I didn't write downt he number
07:21 PM rue_shop5: kenmack auto always has the parts I actually need for my truck in stock
07:21 PM rue_shop5: if I'd just asked for a belt the first time I'd have been ok (for a while)
07:22 PM rue_shop5: I'm glad to have the new steering pump
07:23 PM Tom_L: now you got one to play with too
07:23 PM Tom_L: vane pump
07:27 PM aandrew: well, my little CAN board has a few flaws I should have caught
07:28 PM aandrew: 1. I was sure 12V_ACC was available on the OBD/DLC port, but it's not, so I have to rethink my idea of just using an OBD connector on the box.
07:29 PM aandrew: 2. I can find OBD female snap-in connectors, but not male, and male-male cables or gender benders don't exist
07:31 PM aandrew: 3. I calculated the expected idle current and it's really not worth worrying about not having 12V_ACC available; my primary regulator has an Iq of roughly 2mA, the 3.3V reg is about 200uA, the three CAN PHYs are roughly 10mA on 5V and 1mA on 3.3V rails, and the STM32 is negligible since it'll be sleeping
07:33 PM aandrew: oh and the LED on the opto that supplies the primary regulator draws 12mA. So all in I'm drawing about 25-30mA from the battery when I should be off. that's *nothing* especially compared to what else would be sitting on the battery when the car's off
07:35 PM aandrew: with a minor mod I can put the PHYs in low power mode which gets rid of ~155mW but still allows the PHYs to wake the STM32 up for CAN traffic, and a little more of a mod I can force the opto off if the battery voltage falls below ~66%
07:36 PM aandrew: I'm just really glad I added that PMOS that allows me to control the rpi power. Without that this rev would have been pretty much a write off
07:37 PM aandrew: so next rev will be better and I'll just use a DB15 which'll allow me to use regular old OBD2 -> DB15 cables, I was really excited to find that OBD2 snap in though, pity about the gender
07:41 PM aandrew: I think a DB15 (not HD15) and a DB9 would give me flexibility since some of those signals I want won't be on the DLC and that'll let me get to them without screwing around with the DB15
07:44 PM rue_shop5: wow
07:44 PM rue_shop5: deep
07:45 PM rue_shop5: how long you been on that one?
07:46 PM Tom_L: rue_shop5, was that the first belt?
07:46 PM aandrew: 2 weeks for the schematic entry + layout, couple days to build the first, couple more to figure out why it was shorting out (tented via under the inductor was not so tented), and a day to discover the issue with the OBD2 snap-in connector, and this evening to calculate the power
07:47 PM rue_shop2: Tom_L, well, I went thru the service log, and I have NO other reports of changing the belt
07:47 PM aandrew: I did pay someone $100 to make a 3D model that would fit that snapin connector but that was a waste
07:47 PM Tom_L: how many miles?
07:47 PM rue_shop2: eek god
07:47 PM rue_shop2: 200k km?
07:47 PM Tom_L: used to be ~25k miles but i think they're better now
07:49 PM aandrew: heh I destroyed an engine by not changing out the timing belt before 200kkm
07:49 PM aandrew: that was expensive, but had it repaired and drove it another 100kkm before my son slammed it into a curb sideways, pretty sure he was getting a beej at the time. lucky he didn't lose his dick in that one
07:56 PM rue_shop2: this uses timing gears that self-destruct, but its a non-interfearance engine
07:56 PM rue_shop2: haah
08:10 PM aandrew: :-)
08:35 PM aandrew: actually this would work: https://www.aliexpress.com/item/1005005093413566.html
08:36 PM aandrew: two of those with a DB15 male-male cable
08:36 PM aandrew: that's a lot easier to find
10:22 PM rue_shop2: thats kinda embarrasing that I didn't just start with the belt
10:23 PM rue_shop2: every flat belt I'v seen fail has been catastrophic
10:23 PM rue_shop2: I think I'll put the old alternator back and keep the new one spare
10:45 PM rue_mohr: - take the low-drag pneumatic check valve and hook two up to a speaker to make an air pump
10:45 PM rue_mohr: - change the gasket on the truck doors
10:45 PM rue_mohr: - 1 bit computer , assemble programming interface
10:45 PM rue_mohr: - change front sprockets on the trike
10:46 PM rue_mohr: - assemble irrigation water movment pumps and summer cooling system
10:46 PM rue_mohr: - build shed solar charge controller
10:46 PM rue_mohr: - test the new cnc motor driver at 120V
10:46 PM rue_mohr: - assemble battery pack for Art
10:46 PM rue_mohr: - put away gear counter project
10:46 PM rue_mohr: - clean deck
10:46 PM rue_mohr: - strip down printers
10:47 PM rue_mohr: plant the raspberry bush