Hey guys, called up a local driveshaft mob here in WA, and bought a new center bearing. They sold me a (hardy spicer?) one. They told me there was 2 models, j spec and aus spec. Did a quick bit of research before i chucked it on and noticed people are saying there is a TT and a NA version, with different hights. TT is ment to be marked with a 5 on the base or something along those lines? Either way, the shop tells me there is only one for jspec cars, but the interwebs tell me another story. Does any one know how i could identify if i have the correct one? I believe the difference is the hight, can anyone confirm this? And if so does anyone have any measurements so i can check before pulling my old one off? Thanks in advance!
This is interesting, to my knowledge the forum has been using the same part for NA's and TT's. Driveline part number CB70 (or CB71 without housing) see page 15 here. http://www.driveline.com.au/sites/default/files/CENTRE BEARINGS_0.pdf I had a look in Nissan FAST JDM parts software and found that there are different part numbers for TT and NA. TT 37521-33P25 NA 37521-33P27 (37521-33P26 origonaly but was replaced 01/92) The Hardy Spicer catalogue reflects this on page B:5-42 here: http://www.hardyspicer.com.au/PDF_Files/Driveline/B5_4WD-Truck_&_Forklift_2013-6lr.pdf I loaded up the Australian FAST catalogue and it uses the same NA part number as JDM BUT with a further part update to 37521-33P29. So in the Hardy Spicer catalogue "import" means TT, if you were wanting a bearing for the JDM NA you would get "AUS production". Interesting the Hardy Spicer catalogue that lists the differnt parts for NA/TT has the housing-less part that suits both similar to the Driveline CB71. (This kind of suggests the bracket may well be different.) This still doesn't settle the is there a difference question, where did you see something that suggests this ?
Truth be told, im digging through my search history and I cannot seem to find the pages i was looking at! From memory it was talking about how some shops used to put in the wrong type, and had them die prematurely from the fact the TT ones were a slightly different housing, but in the 96+ models or something like that, they switched so they were the same as the NA's. From what they were saying you could shim the NA to fit the TT, as the bearings were identical, it was just a different hight support. Now as i cant find the page i was looking at i may have to back down and claim late night searching got the better of me! Ill keep looking though, i swear i read it somewhere...
Hah! Now as long as a propshaft equates to a driveshaft; http://forums.nicoclub.com/n-a-propshaft-cetre-bearing-t533953.html
Well I have a TT one from a 91 JDM TT in the shed I can measure the height. If someone has an NA one can measure and post up for comparison?
My JDM catalogue is up to 2001 and my ADM catalogue is up to 2007. During the life of a part there can be changes for actual design change or same part made by a different manufacturer etc. Nissan FAST refers to this as a "Supersession Chain" as newer parts are added they use a different part number and quotes a "interchangeability code". For some reason outside of vehicle production a change has been made and a new number has been issued, but if you order from Nissan/CZP a 37521-33P25 you will most likely be supplied a 37521-33P28 as it has an ICA code of 2 (can be used unconditionally.) Complicated explanation for a simple thing, the way the parts system is set up it doesn't really matter as it still recognises the earlier number.
That would be great if its an original part and hasn't been replaced. But I cant imagine why this has not been noticed before unless the height difference is very small.
I have 2, one from a TT Auto, the other from a TT manual, both identical (except one no longer has the centre bearing thanks to the old man not reading the manual before removing the diff on the weekend lol! Gotta love old school mechanics...). Both have the number '0' stamped on the underneath. 104mm height measured as per the following pic.
It would be good to get a comparative height measurement for the CB70. See if it is based on the TT or NA variant. I'm guessing NA since it's Aussie.
Incase they dont work.. https://flic.kr/p/n6xRGP https://flic.kr/p/n6zDry These show a 2mm difference between the two. This is a new hardy spicer Jspec bearing, and a OEM(?) TT Jspec nissan one. Ill go measure my new and old in the method Shane001 used as well.
I think for that measurement comparison to be accurate, measure to the bottom as you have but also to the top. The 2mm may be offset from centre in the used bearing assembly. The one I have that's still intact is not exactly centred in the housing. There you go
The real issue here is that it's the rubber 'Doughnut' around the CB that wears/distorts over a long period of usage(and cycling between HOT & COLD). This eventually leads to the CB becoming "off-centre", hence the vibration. That is supported by your pics.:zlove:
I have pretty much decided the rubber/bearing inserts are the same, measuring the full height of the bracket would show any difference more clearly I think (x2), and eliminate any stationery wobble in the bearing centre. If there is a height difference it is fairly small as what information we can find is talking about washers and shims to space it out. From Z1Motorsports: http://www.z1motorsports.com/PDFs/NATTconversion.pdf I can see a "0" stamped on one of the brackets in your pictures waZed, have a good look at both brackets are there any other stampings, coloured dots or markings on either of them ?
The only marking on the brackets of both of mine (TT) were the number '0'. I'm guessing from the Nicoclub link the NA will have the number '5'.
Im thinking the NA will have "0" as in flush to its mount holes and the TT will have "5" as in 5mm stand off from mount holes. Why ? (This is a possible theory.) Because a R230 diff has a 230mm crown and a R200 has a 200mm, this would make the pinion input shaft sit lower in a TT. I would imagine the diff output shaft height would be similar between a NA and TT in relation to suspension. So if the diff end of the shaft drops, you would need to drop the CB to maintain angle. I went through a few CB's in quick time, if we have been doing this wrong it may of helped to sell a lot of 1 piece shafts.
No, the TT has the number '0'. Why, because both mine are TT as is WaZed's and they all have the number '0'.
Yes but I would say there are very few TT's that have not had the CB changed in Australia. Even going to Nissan to purchase a CB, guess what they have in stock ? There has been an ongoing issue with CB's imo, at one point it was considered that the removal or should I say the non replacement of an exhaust shield was the issue, we are far from an answer but I think it is interesting.
Brisz, you're posting theory vs fact. Three separate centre bearings from three separate TT's all have the number 0.[TIS]
