jamesmartin
Well-Known Member
count the teeth to be sure
aaronmorris
Head's a shed
Got naff all done today with it being Mothering Sunday...
Snook out to get a bling shot though
Oooh very nice
Bennehboy
Well-Known Member
Cracked on with the mainshaft disassembly...
Made a frankensteins monster puller using my bearing separator to pull the mainshaft support bearing off using first gear (picture is a bit crap):
Once the bearing was clear of its land I slid off the bearing, bush, needle roller and first gear:
Then the syncromesh hub assembly and baulk rings came off:
Now with that lot out of the way 3rd gear can be used to press off the pilot bearing:
Which can then be put to one side:
Closely followed by the spacer:
And then the syncromesh hub assembly and baulk rings (in reality 4th gear's baulk ring pops out when the mainshaft is decoupled from the pinion), you can see the wear here on the 4th gear baulk ring:
And wear on 3rd gears' baulk ring:
And finally 3rd gear slid off and everything lined up in order ready for bault rings & springs to be replaced with new, and all the needle rollers replaced as I rebuild the shaft.
Mainshaft rebuild next.
Made a frankensteins monster puller using my bearing separator to pull the mainshaft support bearing off using first gear (picture is a bit crap):
Once the bearing was clear of its land I slid off the bearing, bush, needle roller and first gear:
Then the syncromesh hub assembly and baulk rings came off:
Now with that lot out of the way 3rd gear can be used to press off the pilot bearing:
Which can then be put to one side:
Closely followed by the spacer:
And then the syncromesh hub assembly and baulk rings (in reality 4th gear's baulk ring pops out when the mainshaft is decoupled from the pinion), you can see the wear here on the 4th gear baulk ring:
And wear on 3rd gears' baulk ring:
And finally 3rd gear slid off and everything lined up in order ready for bault rings & springs to be replaced with new, and all the needle rollers replaced as I rebuild the shaft.
Mainshaft rebuild next.
turbominij
Active Member
im loving this thread as its the exact jobs im about to undertake (transfer box at the weekend)
are you fitting hd support bearings to the R380? if so do you have any information on part numbers? adn any modifications needed?
are you fitting hd support bearings to the R380? if so do you have any information on part numbers? adn any modifications needed?
Bennehboy
Well-Known Member
I read about the HD support bearings whilst flicking about on Ashcroft's website, I had a mail conversation with Dave Ashcroft who said they only supply the upgrade as part of a full rebuild because they have to machine the extension casing.
So, no I won't be upgrading.
I might mail again and ask if they are prepared to sell machined extension casings with the bearings in on an exchange basis though.
turbominij
Active Member
though that might be the case as in the pic they do look a little bigger is a pitty have to stay stock then
that would be interesting
turbominij
Active Member
my dad has a big milling machine too so if we no what bearings they are ???
so if we no what bearings they are ???
turbominij
Active Member
good thinking from that and the info on the site with pics of bearings number of races should be able to work out what they are or be able to find something that will do the same job
Bennehboy
Well-Known Member
The other consideration to be made is that the plastic oil pick up ring sits against the main support bearing on a slightly large diameter bore - any replacement bearing would have to be smaller or the same size as that bore.
Here's the oil pickup in situ
And with it removed (casting is upside down):
Here's the oil pickup in situ
And with it removed (casting is upside down):
turbominij
Active Member
looks like there would be a good couple of mm increase in size possible
so long as the OD of the new bearing does not excede the oil pickup OD should work. once i have my box stripped il measure up unless u got a vernier to hand and can measure both on ur stripped box?
so long as the OD of the new bearing does not excede the oil pickup OD should work. once i have my box stripped il measure up unless u got a vernier to hand and can measure both on ur stripped box?
Bennehboy
Well-Known Member
I've only got some crappy chinese digital calipers that won't get into the casting to measure the ID.
I could measure the bearing OD's (not very accurately!) but doubt that would give a good value for the interference fit.
turbominij
Active Member
think we need to be bang on if its two tight it will cause the bearing to bind and fail (or crack casing) if its two loose it will flop about even minor issue and we will have carnage
Bennehboy
Well-Known Member
Called in at the local bearing factor...
So, they can supply a replacement for the mainshaft bearing no problem
N206 - 30x62x16mm - I need to check that the 16mm diameter is ok because on the RHP bearing only the center is that diameter...
Polycarbonate cage = 35 quid
Brass cage = 50 quid (a lot stronger!)
The layshaft bearing is the problem, it has a non standard ID of 16mm, they can however supply a bearing with a larger ID and a 'bearing ring' to reduce it to 16mm.
Looking at the Ashcrofts photos I suspect this is what they also do, because you can see a sleeve sat inside their HD layshaft inner.
So, they can supply a replacement for the mainshaft bearing no problem
N206 - 30x62x16mm - I need to check that the 16mm diameter is ok because on the RHP bearing only the center is that diameter...
Polycarbonate cage = 35 quid
Brass cage = 50 quid (a lot stronger!)
The layshaft bearing is the problem, it has a non standard ID of 16mm, they can however supply a bearing with a larger ID and a 'bearing ring' to reduce it to 16mm.
Looking at the Ashcrofts photos I suspect this is what they also do, because you can see a sleeve sat inside their HD layshaft inner.
turbominij
Active Member
all very interesting whats the OD of the new main shalft bearing?
and yes now you mention it i also think thats what they have done explains the second (different coloured) ring
and yes now you mention it i also think thats what they have done explains the second (different coloured) ring
