Of course I could be mistaken, but an aluminum bolt seems really unlikely. They exist, but I've never heard of one in this sort of application. Are the bolts attracted to a magnet? An aluminum bolt would weigh one-third of a steel bolt of the same size.
Introducing our 1987 Porsche 924S EV Conversion
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I just went out and checked and it is attracted to a magnet, so you are right. I'm not sure why it feels light to me. Thanks for keeping me straight!
maybe... or i might just be dumb. the latter seems way more likely.
I do have some of the bolts that hold the motor mount to the gearbox housing, took a closer look at them just now. They are larger diameter and shorter in length, but they also thread into aluminum. They are magnetic, and have grade 10.9 stamped into the head. They are also coated with something that looks friggin' exactly like the aluminum castings. Hot dip maybe? What I may do is order 2 bolts a bit longer for a bracket, and hit the junkyard to zip the other 4 bolts out of some other cars. Looks like they are common on a ton of other models (Sentra, Versa, Altima etc).
And for anyone in Canada, the damn things are $9/ea at the dealerships up here, but I bet these would be a good replacement:
![Font Rectangle Cylinder Screenshot Parallel]()
And for anyone in Canada, the damn things are $9/ea at the dealerships up here, but I bet these would be a good replacement:
Doubt that.
later floyd
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Likely zinc plated
Likely one of several types of zinc coating (including zinc phosphate), one of which is hot-dip galvanized. Some suitable coating is likely important because of the installation into aluminum.
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The coating is likely zinc flake. Like dacromet or geomet.
Father-son Porsche 924S EV Conversion Part 11 - Gearbox and Funny Noise
In this video we go through our latest step to get the Nissan Leaf gearbox installed and filled with fresh fluid. We also install an inverter and motor coolant loop. While testing at medium to high RPMs there is an odd rattling noise coming from the gearbox. We aren't sure what it is so if you have any ideas, please let us know!
In this video we go through our latest step to get the Nissan Leaf gearbox installed and filled with fresh fluid. We also install an inverter and motor coolant loop. While testing at medium to high RPMs there is an odd rattling noise coming from the gearbox. We aren't sure what it is so if you have any ideas, please let us know!
Is the pump motor resting on the housing? Wouldn't be something like that or the tank rattling?
You could drop a few bucks on an automotive stethoscope or even put your ear to the back of a big screwdriver and poke around a bit. First step is to localize it imo. I'd probably start by listening around the bearings in the reducer.
You could drop a few bucks on an automotive stethoscope or even put your ear to the back of a big screwdriver and poke around a bit. First step is to localize it imo. I'd probably start by listening around the bearings in the reducer.
I think we tried picking up and moving almost everything to rule out anything vibrating in the test setup. I'm pretty sure it is coming from inside the gearbox. One thought is that it might be the parking pawl - perhaps since the motor isn't holding it rigid in one extent of its travel, maybe it is vibrating in there. At some point we plan on opening up the gearbox to inspect everything and if we don't see anything, possibly remove the parking pawl altogether to rule it out.
I had the same thought. This weekend I got the leaf motor mounted on my tractor project and was just hand-spinning the shaft and heard a rattling noise from the coupler. The play in the splines of the coupler was enough to slap back and forth as the motor magnets pulsed the shaft. I hope/suspect that won't happen when it is running and has some load on it (and once I pack the coupler with some heavy grease).
@lordmundi do you hear the same noise in reverse? If you put an axle shaft in it and rock it back and forth (by hand) do you hear anything? If you had the gearbox off of the motor, did you re-grease the splines?
oh man... this is great info. We were planning on opening the gearbox completely open to look. But your suggestion makes me think perhaps we should wait until we have some sort of axles in it. I don't think I have room in our test setup to put in full axles and support them so they can turn, but perhaps this is something we can wait until it is installed in the car to worry about.
I don't think we have tried high rpms in reverse, so maybe we will try that. And when we put the gearbox on the motor, we didn't grease the splines. Or rather, I can't remember if we did. My thought is I would do that when installing it in the car but didn't think it was necessary for just test fitting and small communication checks. But perhaps that is contributing? What grease do you recommend on the motor shaft? Thanks for this info BTW.
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Yeah without the CVs installed it will rattle. I wouldn't run it any more than necessary without axles installed, the diff may start coming apart.
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I'm not sure how wise it is to run it at high speed, unloaded...why do it at all beyond a few dozen RPM?
I don't think it is wise. Not sure if you were able to watch the video, but there is a big banner advising people not do this. But I am grateful we were able to verify some basic functionality of the motor and the gearbox before putting it in the car. For a while I thought it let us identify this rattle issue, but it sounds like it might be normal for the setup we are in.
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