Bulking gear change

[cliveS]

I have just replaced the input shaft bearing and the one at the far end of teh shaft as the gearbox was whirring. Indeed the front bearing (NTN 6205, very common and only a fiver) was really noisy, the other one was just starting to pick up.

Got the box back in, and I refilled with Comma oil, 75 80 fully synthetic as recommended by opie oils.
The gearbox is now delightfully quiet, but it feels like it is bulking into the gears sometimes. Is this down to not using genuine Honda oil?

On another point, the job is largely just nuts and bolts. The nighmare part was undoing teh steering rack off the subframe, access is appalling. And as I was mumbling to myself whilst refitting, I reckon dropping the exhaust frontpipe/CAT would make life so much easier

[Lord Voltermore]

Just an opinion. I'm not a professional.  If its a conventional manual gearbox and the oil is the correct specification I doubt it would make that much difference. 
Another possibility  is because you changed a noisy and  worn bearing.  The old one may have been sloppy enough to allow shafts ,gears bearings etc to 'float' their precise locations  slightly finding their own path of least resistance when meshing or selectors are sliding. It might have been the shafts tendency to want to move that accelerated the wear on the bearing you had to replace.    Indeed  Honda may have designed it that way  with a relatively easily replaceable  bearing being the weakest link  that will fail before more complex gears and shafts are damaged.   

Its possible the gears may 'bed in ', to their new locations in time . Alternatively  some sort of additive  may improve their  lubrication.( But alternatively it may lengthen the time they take to bed themselves in. ) I'm out of date about suitable products.    But an expert may have different views entirely      

[Jocko]

I never noticed any difference when my gearbox bearings were replaced. I have no idea what oil was used.
The transmission specialist that did mine did it in situ so nothing to drop (don't ask me how).
Could it be that the gear linkage is not set up spot on?

http://www.hondafitjazz.com/transmission_manual.html

[Jocko]

Found this in that link:

Always use Genuine Honda Manual Transmission Fluid (MTF). Using motor oil can cause stiffer shifting because it does not contain the proper additives. (my underline)

[embee]

I don't know about your particular box, but I know that some model gearshifts can be very sensitive to the exact oil used while some are very tolerant. If yours continues to be a bit "baulky" I'd bite the bullet and try some genuine Honda manual box oil of the correct spec, you should be able to get the right match at https://www.coxmotorparts.co.uk/
It just depends what the synchro has been designed/developed to work with as regards friction.

[cliveS]

Reading the above the jury is out!
I think I will leave it a week and see how it goes. £40 on fresh Honda oil is not a deal breaker to try after that.

It is a cracking little car, and despite an poor young girl writing it off by driving in the back of me (which paid for the car, fixed with a used tailgate and bumper plus 1/2 hr with a hammer) it is a great little thing. The only other issue I have had in 2 years is all teh exhaust boxes fractured around where the pipes enter/exit, a couple of hours sorted that with the help of the mig. Just resealed all teh calipers too. But apart from the several batteries my MIL had fitted, that is the ONLY non-service work teh car has had in 60k and 17 years.
Soon going to my daughter, as long as I can part with it.

[Wilmo]

Jocko
that reference in the manual is to MOTOR oil, i.e. what you put in the engine.
that might get used in an emergency until the proper stuff can be put in.

some members on the Civinfo.com forum have used synthetic oils like Castrol Syntrans.

[Jocko]

Gearbox oil is still considered motor oil, it is not ENGINE OIL which you put in an engine.

[cliveS]

I never noticed any difference when my gearbox bearings were replaced. I have no idea what oil was used.
The transmission specialist that did mine did it in situ so nothing to drop (don't ask me how).
Could it be that the gear linkage is not set up spot on?

http://www.hondafitjazz.com/transmission_manual.html

I am really intrigued how it was done in situ. There is not enough room to get any part of the case off unless the engine was tilted at about 45degrees. And that still needs the subframe dropping.
I did have a Zafira box refreshed in situ, but that only needed dropping a bit and some special tools.

I was tempted by the £400 supply/fit a recon box, BUT I expect they only swap the front bearing, and they probably use the £2.50 type rather than the £5 NTN. Sure, it will last a while BUT....

[Jocko]

Mine was done by https://www.topgear.uk.net/ and cost a total of £324 (2018). For that, they replaced all seals and bearings and it came with a 12-month/unlimited mileage guarantee. They did it in situ and the chap said they did one Jazz a week, on average. I dare say they had the tools to do it.
I dropped it off one day and picked it up the next.
The car went off to the scrappies at the beginning of the year with a further 49,000 miles on it and the gearbox was still as sweet as a nut.

[Wilmo]

I suspect that the Japanese use American English and call engine oil, motor oil.

Also I think thread started means the gear change is baulking.