Gearbox Wont Go In!

[str00th]

Pretty Basic...

Rb26dett, RB25Det box, OS Giken BD Tripple plate clutch

lined up and straight

slide it up but with about 2cms to go to get it to be flush with the block to do the bolts up, it just stops and no matter how hard we push and twist it wont go in..... had 3 of us trying to get it in and wont go all the way....

It should just slide in right??

Ive spent 3 weekends on it and ready to smash a windscreen!!

by no means am i an expert but it should just go in??

HELP!!

free SLAP to anyone who can come and put it in.....:S

[raps86]

it might sound stupid but did u check if the spiggot bearing slides over the end of the input shaft. ive seen a few people at my work that havent checked and went 2 put the box in and it dont fit pull it out and surprise it dont fit on the input shaft, and r the dowles correct as in only in the block and none sitting in the gearbox

[battery]

mate i have just had the same problem TODAY!

i found that the new spigot bush i put in was too small for the input shaft, so i grabbed my dremel and grinded down the inside of the spigot.

the box was still 1cm out so i just put a few bolts in the bell housing and tighten till it was flush!

bastard of a job!

let us know how you go!

[str00th]

ok well its an R32 1994 RB26dett and a R34 rb25det gearbox

does that go? or do i have to change the spigot bearing?

[str00th]

ohhh... i think i see now.. so i need a R34 Rb25det pilot/spigot bearing

is that right??

[battery]

no idea what you need but the best thing to do is buy one and test that it fits on the input shaft before you install it in the crank!

[zonbie]

Yep. Agree with the comments above........... Sounds like your spigot bearing is too small.

Some advice from an old fart... Don't try to grind the bastard out with a file or drill etc. Wait and get the right sized spigot bearing/bush. They are an important part of the drivetrain, and the time you lose sourcing the right bearing will pay for itself many times over with many kilomoteres of stress free driving in the future.

Good luck, Steve.

[str00th]

i love this forum, so much wisdom

i'll order a spigot/pilot bearing on monday and fingers crossed thats the problem but it sure sounds like it

[BHDave]

silly question, but did you align the splines on the plates or did you just use one of those universal alignment tools that doesn't have splines?

2cm suggests you aren't thought the splines yet. Can i suggest removing and checking that the clutch hasn't been damaged with all the force being put on it?

While you've got it off you should be able to easily dummy up the box and confirm that the spigot fits (if it's the original bush it will fit, rb26 gearbox spigots are not smaller than rb25)

[str00th]

The os Giken Plates have slots in the flywheel that automatically line the splines up.

At that point its in you cannot twist the drive shaft which indicates its locked into the splines.

You say the Spigot bearing is the same size? this is a r34 box not a r33 is that still the case?

[BHDave]

99% certain they are the same. Never measured one up but i just can't see nissan changing when they have used the same sized input shafts on every box i've ever looked at.

It's an easy enough thing to measure even with the clutch bolted to the flywheel as you can still access it.