Undoing gearbox filler plug....

Engines, Transmissions & Final Drive questions and answers

Moderators: timk, Stu, zombie, Andrew, The American, Lokiel, -alex, miata, StanTheMan, greenMachine, ManiacLachy, Daffy

Silvia
Racing Driver
Posts: 677
Joined: Thu Nov 17, 2011 1:42 pm
Vehicle: NB8B
Location: Moffat Beach QLD.

Undoing gearbox filler plug....

Postby Silvia » Sat Feb 04, 2012 11:00 am

Some say.....you can't fit a 23 or 24mm socket on the gearbox filler plug because it's too close to the exhaust pipe...can anyone save me a trip under the car (2002NB8C) and
tell me if this is true? If so, what's best to use? Thanks guys... :lol:
Silver Nomad
2002 NB8C

Hjt
Speed Racer
Posts: 2499
Joined: Thu Jan 13, 2011 12:46 pm
Vehicle: NB8A

Re: Undoing gearbox filler plug....

Postby Hjt » Sat Feb 04, 2012 11:08 am

Just take it to a mechanic so you don't put your back out old fella.

Personally, I grabbed both and went searching.

koop21
Fast Driver
Posts: 296
Joined: Tue Aug 23, 2011 12:31 am
Vehicle: NA6
Location: Sydney

Re: Undoing gearbox filler plug....

Postby koop21 » Sat Feb 04, 2012 11:09 am

not sure if its the same as na6, but if its a square filler plug use a 14 spanner i think or 16...

User avatar
NitroDann
Forum sponsor
Posts: 10280
Joined: Thu Nov 05, 2009 12:10 pm
Vehicle: NA6
Location: Newcastle NSW
Contact:

Re: Undoing gearbox filler plug....

Postby NitroDann » Sat Feb 04, 2012 11:15 am

Go and buy the correct sized socket, and then cut it to half its length, now it fits.

I have one cut especially for that bolt.

Dann
http://www.NitroDann.com

speed wrote:If I was to do it again, I wouldn't even consider the supercharger.

Silvia
Racing Driver
Posts: 677
Joined: Thu Nov 17, 2011 1:42 pm
Vehicle: NB8B
Location: Moffat Beach QLD.

Re: Undoing gearbox filler plug....

Postby Silvia » Sat Feb 04, 2012 11:29 am

Yeah I thought of that but my sockets have the "facets" at one end and the clip-on at the other....cutting it would lose one or t'other :cry:
Silver Nomad
2002 NB8C

User avatar
Hellmun
Racing Driver
Posts: 979
Joined: Sat Feb 10, 2007 1:15 pm
Vehicle: NB8B - Turbo
Location: Wollongong,NSW

Re: Undoing gearbox filler plug....

Postby Hellmun » Sat Feb 04, 2012 11:33 am

I just do it with a big spanner......

User avatar
NitroDann
Forum sponsor
Posts: 10280
Joined: Thu Nov 05, 2009 12:10 pm
Vehicle: NA6
Location: Newcastle NSW
Contact:

Re: Undoing gearbox filler plug....

Postby NitroDann » Sat Feb 04, 2012 11:35 am

buy one from supercheap. Dont cut part of a complete set.

Dann
http://www.NitroDann.com

speed wrote:If I was to do it again, I wouldn't even consider the supercharger.

User avatar
Steampunk
Speed Racer
Posts: 4670
Joined: Wed Oct 10, 2007 9:16 am
Vehicle: NA6
Location: Southside of Breeze-bane

Re: Undoing gearbox filler plug....

Postby Steampunk » Sat Feb 04, 2012 3:00 pm

just use a shifter spanner
Image

User avatar
greenMachine
Forum Guru
Posts: 4054
Joined: Thu Apr 24, 2003 11:00 am
Vehicle: NB SE
Location: Sports car paradise - Canberra
Contact:

Re: Undoing gearbox filler plug....

Postby greenMachine » Sat Feb 04, 2012 4:00 pm

1red5 wrote:just use a shifter spanner


Don't use a shifter (unless you have a very good one with a long handle, AND you have had the plug out before, and therefore know it is not going to take a huge force to get it moving). Shifters are prone to flexing when the going gets tough, which can lead to rounded bolt heads - not recommended :( .

These drain plugs can be very hard to get out, as usually they have not been touched since the box left the factory.

Just get the right tool for the job. It's not worth the grief if you botch it.

:mrgreen:
I never met a horsepower I didn't like (thanks bwob)

Build thread

NB SE - gone to the dark side (and loving it 8) )

User avatar
Steampunk
Speed Racer
Posts: 4670
Joined: Wed Oct 10, 2007 9:16 am
Vehicle: NA6
Location: Southside of Breeze-bane

Re: Undoing gearbox filler plug....

Postby Steampunk » Sat Feb 04, 2012 4:24 pm

I agree, I use shifters either as a last resort or where nothing else would work, but the one that I have is good quality and on the large-ish side, and regardless of torque I always tighten it up as much as I can when it's on the bolt to avoid slippage.
Image

Silvia
Racing Driver
Posts: 677
Joined: Thu Nov 17, 2011 1:42 pm
Vehicle: NB8B
Location: Moffat Beach QLD.

Re: Undoing gearbox filler plug....

Postby Silvia » Sat Feb 04, 2012 4:25 pm

Thanks GM and ired5, that was my thought too about using a shifter, though there seem to be better designed ones these days, it would be a last resort.
Plug has been out before according to service records.
Really good advice to get the filler plug out first!
Normally of course you'd use a socket but with the exhaust pipe so close I hear it can be a problem to get it in there. This gap seems to vary between models.
Also some need to take off protection plates bolted underneath,some not.
I thought it was a good idea to cut down a socket to fit , but seems my hacksaw won't do it inside a month of cutting! :roll:
I'll try to buy a 24mm ring spanner tomorrow.....
Silver Nomad
2002 NB8C

User avatar
gslender
Speed Racer
Posts: 2330
Joined: Sat Feb 19, 2011 10:49 pm
Vehicle: NA6
Location: Brisbane, QLD

Re: Undoing gearbox filler plug....

Postby gslender » Sat Feb 04, 2012 4:31 pm

1red5 wrote:I agree, I use shifters either as a last resort or where nothing else would work, but the one that I have is good quality and on the large-ish side, and regardless of torque I always tighten it up as much as I can when it's on the bolt to avoid slippage.


Very large shifting spanner worked fine for me... but then mine came undone fairly easily so I'd start there, and if too much force is needed to "shift it" then move onto one of the other methods.

G
MX5 91 NA6 LE completely stock and loving it!
MX5 92 NA8/ITBs Silver "aka Track Beeotch"

User avatar
david_syd_au
Racing Driver
Posts: 935
Joined: Mon Feb 07, 2011 10:27 am
Vehicle: NC
Location: Bilpin, NSW

Re: Undoing gearbox filler plug....

Postby david_syd_au » Sat Feb 04, 2012 7:13 pm

I did the gearbox oil today on my 1998 JDM Roadster RS, 6 speed gearbox.

Used a 24mm ring spanner for the gearbox filler plug.

As you noted, it was hard to get a 24mm rachet in their because of the exhaust pipe.

FWIW, the gearbox drain and diff filler were also 24mm.

Interesting, the diff drain plug was 23mm.

Go figure!
2011 NC LE "Black Beauty" (ours) | 2006 NC race car "Shazza" (his) | 1998 JDM NB race car "OMG" (hers) | NC Trailer

eskimo
Driver
Posts: 31
Joined: Sat Jul 24, 2010 9:37 am
Vehicle: Clubman

Re: Undoing gearbox filler plug....

Postby eskimo » Sat Feb 04, 2012 8:42 pm

Just a tip for when you get it out, use a new sealing washer as they are a crush type and over time people
have to tighten them more and more to stop them weeping, which in turn makes then harder to remove.

Silvia
Racing Driver
Posts: 677
Joined: Thu Nov 17, 2011 1:42 pm
Vehicle: NB8B
Location: Moffat Beach QLD.

Re: Undoing gearbox filler plug....

Postby Silvia » Sun Feb 05, 2012 10:10 am

Happened on a 7/8" ringspanner at the local markets for $2 today and the man swears it's the same size as 24mm. We'll see....
Silver Nomad
2002 NB8C


Return to “MX5 Engines, Transmission & Final Drive”

Who is online

Users browsing this forum: No registered users and 110 guests