Rattly 3rd gear - any ideas why??

jennyrebel
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Rattly 3rd gear - any ideas why??

Unread post by jennyrebel » October 9th, 2016, 7:06 pm

Hi all
My F78 has developed a really rattly 3rd gear. It seems it has been leaking gear oil from around the gearbox drain hole which went unnoticed for a bit. Anyhow after refilling the oil there is still a nasty rattle in 3rd. No other gears seem affected. Does anyone have any ideas what might be causing this?

typhoeus
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Re: Rattly 3rd gear

Unread post by typhoeus » October 9th, 2016, 7:32 pm

Daihatsu gearboxes aren't all that common, so what ever it is, you want to fix it before it gets expensive!!

Peter Aawen
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Re: Rattly 3rd gear - any ideas why??

Unread post by Peter Aawen » October 9th, 2016, 7:50 pm

The G/box casing wasn't damaged & the cause of the leaking was it?? If the casing has been hit hard enough to crack it, then it could be that the bearings &/or a layshaft has moved enough for the meshing to be outta whack, in which case, sorry, it's gonna cost!! :eek:

But if it was just that the plug wasn't done up properly or didn't have a sealant that worked so you ran it low on oil or dry for a while.... then it might just be a coupla dud bearings & maybe only an overhaul that's needed; but it's still likely that you to fix the rattle you are gonna hafta pull the g/box out & check bearings & gears etc, & that's not really going to be exactly cheap!! :(

Or you could track down a 'reasonable condition' second hand box now & start saving up like buggry to get it re-co'ed while you keep driving yours with the rattle until it fails!! If it's just a little rattle, there's a good chance it's just you listening for & hearing things to worry about cos you know it ran low/dry & you are worried; but if it really is that 'nasty rattle' you tell us it is, then there's probably no way around it costing a reasonably big fistful of $$ to sort.

Good Luck!! :thumb:
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jennyrebel
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Re: Rattly 3rd gear - any ideas why??

Unread post by jennyrebel » October 10th, 2016, 6:07 am

Ah - the cost is what I'm afraid of! Thanks Peter for your reply - I did have to have the casing welded a couple of years ago as there was a hole in in but they seemed to do a good job. I think the leak was caused the seal not being very sound on the plug. I will get it to a gearbox specialist this week and see what happens. I'm keeping my eyes out for a second hand gearbox too , but indeed they're as rare as rocking horse *****! :rolleyes:

typhoeus
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Re: Rattly 3rd gear - any ideas why??

Unread post by typhoeus » October 10th, 2016, 6:15 pm

You should look on any Daihatsu forums you can find. I have a faint memory of hearing that a daihatsu delta truck box will fit, using the rear extension housing off your old box, . . . but I'm not sure of the details. You will have to do a little research

jennyrebel
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Re: Rattly 3rd gear - any ideas why??

Unread post by jennyrebel » October 11th, 2016, 4:07 pm

Yes thanks Typhoeus, I had a quick look at the Delta but from what I can find out so far it will fit the Scat, no mention of a Rocky... Mind you I reckon the Deltas are just as hard to find as Rockys. Funnily enough the 3rd gear is less rattly today. Still having it checked out though.

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