Post by: swhull on May 09, 2022, 07:39:28 PM
How the hell do these things shear in half? First thing RAC guy said is "things don't usually go wrong with these cars" ::)
Post by: Johncb500 on May 09, 2022, 07:54:30 PM
Hard luck.
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Post by: swhull on May 09, 2022, 08:05:35 PM
Post by: geoffchats on May 09, 2022, 09:31:19 PM
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Post by: madasafish on May 10, 2022, 11:05:48 AM
Was it rusty? That weakens it I understand
Which side?
Post by: swhull on May 10, 2022, 05:29:07 PM
Bit annoying that it’s a known weakness, don’t fancy the other side failing anytime soon.
Post by: swhull on May 11, 2022, 09:51:52 AM
Post by: madasafish on May 11, 2022, 01:28:08 PM
Post by: 123Drive! on May 11, 2022, 11:30:46 PM
Post by: Westy36 on May 12, 2022, 05:56:18 AM
If the shaft were to be inspected, and ideas what would sign pending doom?
Was it much to get replaced?
Post by: swhull on May 12, 2022, 06:31:55 AM
It is a bit disconcerting when it happens, westy, that’s for sure. At first it sounded like the transmission had exploded or something snapped in the engine, so to find out it was only the driveshaft was a relief. It didn’t damage anything related to the gearbox or engine so that’s good.
I guess you could check for signs of rust near the joins, but it seems like dirt and salt and general road rubbish has just gotten to it and weakened it over the years. And it seems to be a known jazz mk2 issue from what I’ve read, and the video posted earlier in this thread.
Cost £240 all in, not a cheap part, but quick job.
Post by: Geordielad on May 12, 2022, 10:31:54 AM
Turns out he pushed the diff lock button! I hadn’t even thought of this, d’oh!
Anyway drive home about 50 miles very gingerly.
I dread to think what it could have been like, given some of the wild places we’d driven in and out of. Thanks for small mercies eh?
Post by: Jocko on May 12, 2022, 06:46:40 PM
The guy at my garage said that the number of broken driveshafts, on all cars, rises proportionately with the number of potholes...I was taught years ago, and I still do it now, to declutch over unduly rough sections. I do it over speedbumps these days. It seemingly reduces the strain on the transmission.
Post by: Westy36 on May 12, 2022, 09:34:32 PM
I was taught years ago, and I still do it now, to declutch over unduly rough sections. I do it over speedbumps these days. It seemingly reduces the strain on the transmission.Never heard of that before, but sounds like good advice for sure.
Post by: aphybrid on May 13, 2022, 06:21:06 AM
Think it just rusted and gave way, mechanic seemed to think so. Just dirt and general crap getting into the join and degrading it over time. At least it didn’t damage anything else when it broke, just swapped it out and topped up the gearbox oil. Good to go.
corrosion pitting may have initiated the failure looks like fatigue striations coming from a couple, though better photo of fracture face may/may not confirm
Post by: swhull on May 13, 2022, 06:27:56 AM
corrosion pitting may have initiated the failure looks like fatigue striations coming from a couple, though better photo of fracture face may/may not confirm
Don’t have anymore pictures unfortunately. Maybe the original driveshaft was just not very good. I’ve read about the recalls in America regarding this part, none in the uk though. Might just be bad luck. Either way, something to be aware about if you own the mk2 Jazz I guess.
Post by: aphybrid on May 13, 2022, 09:27:12 AM
All of which exasperated of course by the the occasional high loads imposed.
Statistically I imagine a very rare occurrence and at high lives.
Post by: John Ratsey on May 13, 2022, 01:41:38 PM
I wonder if there's an element of the "weakest link" concept in Honda's design. Although the front driveshaft replacement isn't easy, it's still easier than replacing many other transmission components.
Post by: Kenneve on May 13, 2022, 03:42:48 PM
Most breakages of this type are due to torque, rather than rotational speed.
With 44 years service at Landrover, I can confirm Johns thoughts re the old Landrover axleshafts.
Post by: embee on May 13, 2022, 05:00:38 PM
https://en.wikipedia.org/wiki/Stress_corrosion_cracking
The shafts themselves are almost certainly perfectly fine until they get a small corrosion crack, then it's just a matter of time/miles.
I'd be inclined to apply a suitable corrosion block type product which could "wick" into the joint, ACF50 or similar would probably be sufficient to delay such issues.
Post by: madasafish on May 14, 2022, 07:59:50 AM
Those failures look like classic fatigue failures originating at stress corrosion cracks probably caused by trapping of salt where the shaft dampers are fitted.
https://en.wikipedia.org/wiki/Stress_corrosion_cracking
The shafts themselves are almost certainly perfectly fine until they get a small corrosion crack, then it's just a matter of time/miles.
I'd be inclined to apply a suitable corrosion block type product which could "wick" into the joint, ACF50 or similar would probably be sufficient to delay such issues.
Thanks for the tip.. on my todo list
Post by: Lord Voltermore on May 14, 2022, 12:27:00 PM
Its quite possible the drive shaft is a designed as the weakest link to protect internal gears etc. The balance between sufficiently strong, but sufficiently weak may tip due to corrosion stress fractures. So its worth protecting and extending its life as much as you can.
The fact the near side shaft appears less affected could be because Honda make it slightly stronger to minimise extra failures from driving off the kerb, . (Japan also drive on the left.) But there could be other reasons ,such as different length shafts etc.
Lets hope the high torque of the mk4 electric drive wont affect drive shafts. Probably less need to protect any internal gears . Unless Honda push the limits to save weight.
Post by: swhull on May 14, 2022, 02:48:05 PM