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Undoing Gearbox Drain/fill Bolts

SiR_RB
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SiR_RB Grand Master

SiR_RB

Posted
Posted

bought some good ol' redlight shockproof for my r32 gtr gearbox today, and i had abit of time so i jacked up the car, threw some car stands underneath for good measure and began to try unscrew the fill bolt..

that thing is on soo tight it would not budge, i used a 1/2" breaker bar and it didnt work, ive got limited room under the car so i couldnt slide a longer bar over the breaker bar for leverage.

how did other people go about removing this bolt? any special tricks that worked? its so simple to change the oil i dont wanna take it to a mechanics for it, ild rather do it myself, unless of coarse i have no other choice

all advice would be great ! thanks ! im gonna give it a go tomorow again hehe

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Spurdo Experienced

Spurdo

Posted
Posted

might be telling you how to suck eggs but were u able to drain it from the bottom bung first?? probably do that.

i had the same issue with my rb25 box it was like whoever last changed the box oil put loctite in the bung thread or something. i just had to get a longer steel rod on the end of the nudge bar for more leverage. that was only possible as i had the car up on the hoist though, otherwise theres only so much leverage you can get.

GTRsean Grand Master

GTRsean

Posted
Posted
Take the gearstick out and fill up through there. GTR box is 3.8L?

DO NOT do that. You will be filling up the transfercase with redline then, and that uses Transmatic D!

The shifter in a GTR/GTS-4 does not sit above the gearbox itself, it's on top of the transfercase.

For a GTS-T that would be fine.

If you do not have the correct square drive which is a metric piece then:

I put the 1/2 inch breaker on and kicked it, and or used a big rubber mallet on the end of the bar.

If the center is chewed out, you may need to get a metal bar welded to the bung....

There are other solutions too, just do a search.

Cheers.

Deano 1 Mentor

Deano 1

Posted
Posted
might be telling you how to suck eggs but were u able to drain it from the bottom bung first?? probably do that.

i had the same issue with my rb25 box it was like whoever last changed the box oil put loctite in the bung thread or something. i just had to get a longer steel rod on the end of the nudge bar for more leverage. that was only possible as i had the car up on the hoist though, otherwise theres only so much leverage you can get.

DO NOT DO THIS ON A GTR BOX..... YOU WILL FILL THE TRANSFER CASE NOT THE GEARBOX!!!!!!!!!!!!!!!!

i had the same prob on my box the dickhead at the work the owner b4 me took it tighen them up way to much.... for the record.... its a plug that holds oil in the gearbox, its a tapered bolt... therefore it dosent need to be tighened up stupidly. just firm it up and than half a turn tight.... its not wheel nut.... or a dam rod bolt. its a just a plug.

ok i was able to undo my filler plug, lucky enough i have a 2post hoist in my garage so it was easyer to work on. for the drain plug this is where the real prob was, i had a rattle gun and all on it and there was no budging. So what i did in the end was, get a drill bit that fit the 1/2inch hole the break bar gose in, and drill it, DO NOT drill right throw, if you do u will break the magnet on the back and will go all over the box on the inside, as its magnetic... lol. Just lightly drill in 2mm-2.5mm and than little bits at a time, it will take the tension off the taper of the bolt/plug. it worked for me, i didnt think it would but after 4hours trying to get it out, it was my only option and it worked. just be careful.

hope this helped. : D

doo doo Proficient

doo doo

Posted
Posted (edited)

DO NOT fill the gear box via the gear shift hole. On a GTR this goes into the transfer case and uses auto trans fluid. If you're friendly with your mechanic you could ask get him to put it up on a hoist quickly and crack the bung with a rattle gun (a six pack of something might suffice for this favour), then retighten with a wrench enabling you to undo it when you take and the car home and do your oil change. I would also imagine that if you haven't got enough room underneath for an extension on your breaker bar the car could be higher- make sure it's on stands and not just a jack when you get under- as a rule, not just for good measure.

Edited by doo doo
Deano 1 Mentor

Deano 1

Posted
Posted
DO NOT do that. You will be filling up the transfercase with redline then, and that uses Transmatic D!

The shifter in a GTR/GTS-4 does not sit above the gearbox itself, it's on top of the transfercase.

For a GTS-T that would be fine.

If you do not have the correct square drive which is a metric piece then:

I put the 1/2 inch breaker on and kicked it, and or used a big rubber mallet on the end of the bar.

If the center is chewed out, you may need to get a metal bar welded to the bung....

There are other solutions too, just do a search.

Cheers.

lol you beat me to it

SiR_RB Grand Master

SiR_RB

Posted
  • Author
Posted

thanks for the replys !

yeh i wasnt going to fill it through the gearshift, as i read previously its not suitable for GTR's

i dont know how tight the drain plug is cos i didnt try it, but as most GTR owners would know, theres limited room between the "fill" plug and the front drive shaft, this is my concern, also, looks like it was a bitch to get off before as its slightly "rounded" inside. the 1/2" drive still bites hard and didnt slip,

does anyone know what the proper size is for the drain/filler square bolt thing is? where can i buy one from ? ild rather go get the proper tool to avoid the screw from being rounded so much that its farkeed.

BANGN Experienced

BANGN

Posted
Posted (edited)

f*k sake, get the correct tool for the job!, (what GTRsean said) is it any wonder on skyline box's and diff's the drain plugs are rounded out because people use the end of their breaker bars. If you have the correct tool you will find they come undone with a bit of leverage

Edited by BANGN
SiR_RB Grand Master

SiR_RB

Posted
  • Author
Posted

success !!

ok so this is how i got my friggin tight fill bolt undone... i used the 1/2" ratchet, put it into the fill bung and let the handle of the ratchet hang down, i then put this electric scissor jack (like the one standard in skylines, but electric) between the gearbox cross member and the ratchet handle, holding the jack with the left hand, my right hand was controlling the up/down switch, started to open the jack, forcing it against the ratchet, within seconds the fill bung cracked loose.

didnt strain myself or graze any knuckles in the process lol

so the 3 litres or so of the old fluid is out, and 3.8 litres of redlight shockproof (blue) went in :P

ClutchBurndout-:( Grand Master

ClutchBurndout-:(

Posted
Posted

if someone has tightened that bolt on the gearbox, GOOD LUCK GETTING IT OFF

somehow, me and my bro got it off after about 20 mins, we had an extension bar on it, and both of us where under the car, i had my foot on his foot, and we were both really straining to get it undone, but after some popped veins we got it cracked.

but like others have said, you can fill it from the top on gtst's but not in gtr's

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