Gearbox Filler Plug Stuck - Servicing - MX5Nutz Forum

Jump to content

These ads only show for users who are not registered or logged in


Photo

Gearbox Filler Plug Stuck


  • Please log in to reply
11 replies to this topic

#1 Cliddoris

Cliddoris

    Made a start

  • New Members +
  • Pip
  • 30 posts
  • Location:Belfast

Posted 31 August 2020 - 08:01 PM

Hey guys,

Was doing a full service of the car (94 mk1) so coolant flush, oil change for engine, gearbox, diff and a few other wee bits and pieces needing done.

Got round to the gearbox, as with a lot of things I do on the car, I spent 90% of my time fighting one thing, the gearbox filler plug.

The square 14mm plug, looking at it, it would seem someone has used thread locker in a past life and it is well in there.

I threw a load of penetrant on it then hit it with an adjustable locking wrench, putting everything I had I to it, ended up slipping off somewhat rounding, went back with a 14mm spanner and breaker bar, same issue.

Tried applying heat and no joy.

It's looking like this thing is due to stay in for the life of this box, any way I can fill the box up through the speedo cable hole or something?

Or if anyone has tips for these filler plus I'd be happy to hear, I have a spare 5 speed in my garage with twice the mileage as mine, filler plug came out no bother!

Cheers,


-EDIT-
Box is a 5 speed.
  • 0

#2 Shadowraven

Shadowraven

    Banish a little rust a day people

  • Members
  • PipPipPipPipPipPipPipPip
  • 4467 posts
  • Gender:Male
  • Location:Buckinghamshire

Posted 31 August 2020 - 09:50 PM

Sounds like it might be cross threaded. Nothing else I can really suggest apart from let it soak in penetrating fluid and apply more force. 


  • 0

UKDM 1998 1.8 Mk2 Sport - Current mods-  Custom 6 point chassis mounted front splitter and sideskirt extensions, battery cut off switch, OEM 'small skirts' and lip, HEL braided brake lines, OEM front upper strut brace with MC brace and mazdaspeed sticker, custom made 2" high flow catback exhaust, Japspeed 4-1 exhaust manifold, Lorber 15" alloys in fiat 750 maroon volcano, uniroyal rainsport2s, Ebay special JDMyo! gear knob, tinted indicators, colour coded reflectors, black headlight inserts, LED sidelights, SMD number plate bulbs, dimpled and grooved mtec brake discs, mintex brake pads, de-tango'd headlights, amber bulbs, RGB footwell lights, SMD interior light, Deltastyling spoiler, foamectomy seats, mazdaspeed seat belt pads, ring ultimax headlight bulbs, IL Motorsport style bar in custom paint, ford fan washer jets, Skidnation coolant reroute with Kia thermostat housing, Gates 22436 radiator hose with hose bracket, 82/85 degree twin valve thermostat, D1 spec engine bay dress bolts, stainless steel bolts throughout engine bay, EGR blanking kit, painted brake calipers, painted tow hooks front and rear, wrinkle painted cam cover, de-greened dials with white SMDs, red needles, painted cigarette lighter, painted oil filler cap, custom made cup holder, painted radiator retainers, polished slam panel, painted alternator, painted upper manifold, painted throttle body, painted header heat shield, painted relay bracket, painted loom brackets, painted diagnostics box bracket, painted wash fluid brackets, painted ABS brackets, painted airbox brackets, painted horns and brackets, painted throttle cable brackets, painted charcoal canister brackets and hard piping, painted wiper rods, painted engine hooks, painted clutch line bracket, Jass offset license plate bracket, offset square plate, 1lt foam fire extinguisher on custom bracket and custom Velcro retaining strap, POR15 rust proofed to within an inch of it's life, cavity waxed and fully seam sealed
 
UKDM 2001 mk2.5 - Current mods- SMD interior light, SMD number plate lights, Corbeau Sprint (yes it fits!), modified mk2.5 door card, Skidnation seat brackets, Corba 1046 remote central locking unit, Driftworks basics 350mm leather steering wheel, NRG short hub, NRG 2.5 quick release hub, 8" weighted gear knob, factory electric wing mirrors, factory electric aerial, Kage 4" exhaust with additional powerflow silencer, foam fire extinguisher, custom fire extinguisher mounting bracket, painted cam cover, painted oil filer cap, 15" Advan SA3Rs, Nankang NS-2R 180tw, offset plate bracket, RGB footwell lighting, sun strip, painted calipers and carriers, painted headlight inserts, softtop delete, brake fluid reservoir sock, GCR3 roll bar in custom gloss black, Corbeau Ultima Pro 2006SSU 6 point harness, push button bumper quick release pins, twin port oil catch can, engine bay respray, fully POR15 rust proofed chassis, full chassis seam seal, custom permanent hardtop side mounts, Jass permanent hardtop front mounts, M-tuned large rear rotor spacers with corresponding 276mm SVT brake discs, Freakyparts larger front rotor spacers with corresponding 11" Corado G60 front rotors, HEL braided brake lines, Byba Kits GV style front lip, SVT under chassis bracing, painted radiator brackets, 
mazdaspeed seat belt pads, charcoal canister delete, large Mazdaspeed side skirts, adapted NA short shifter, 60mm alloy radiator, 3" brake ducts, upper strut brace with MC brace, 3.9 type 2 torsen, 80A diff bushes, front tow hook, rear tow hook
 
2004 Celica T Sport - Current mods- Meister Zeta Pro coilovers, Forged Wilwood dynalite front calipers, Yellow stuff brake pads up front, Drimpled and slotted discs, Braided brake lines, TRD stubby aerial, Short shift kit, 17" alloys powdercoated in metallic granite, TRD centre caps, Invidia exhaust, Cusco brake master cylinder brace, SMD side light bulbs, butterfly valve delete, Aux to CD converter, 8" gear knob, sun strip, interior SMD bulb, remote damper adjusters

 
Sold- UKDM 1992 1.6 Mk1 SE - Current mods- Yokohama A048 semi slicks, 15" Lorber 7JJ deep dish alloys, Tein street springs on OEM dampers, IL Motorsport catback exhaust, IL Motorsport decat, K&N greenstuff filter, OMP 330mm racing wheel, TR Lane half cage, TR Lane harness bar, Elise bucket seats, Sparco 4 point harness, Ebay special JDMyo! gear knob, GV lip, Vindii ducktail
 
 


#3 dadbif

dadbif

    Nutz regular

  • Members
  • PipPipPipPipPip
  • 741 posts
  • Location:UK

Posted 01 September 2020 - 07:02 AM

Have you got enough access to get a length of scaffold pole tube or similar on it to increase leverage?
  • 0

#4 Rasc

Rasc

    Advanced Nutzer

  • Members
  • PipPipPipPipPipPipPip
  • 2678 posts
  • Gender:Male
  • Location:Distant very distant

Posted 01 September 2020 - 07:35 AM

Can you get your hands on an impact wrench? I find they are very useful, got myself a cheap electric one from Lidl’s a while back.
  • 0

MK1 RS Ltd, Turbo, Tien Super Sport, Recaro's, BBS, 227 WHP
MK2 RS White, HKS turbo, Koni sports, Watanabe's

MK2 VS White, HKS turbo, Miester Rs, 949 ULs


#5 Ecosse

Ecosse

    Ecosse

  • Members
  • PipPipPipPipPipPipPipPip
  • 3858 posts
  • Gender:Male
  • Location:Scotland

Posted 01 September 2020 - 08:45 AM

Thank God you've a spare box.

Age/miles is pretty irrelevant but I'm wondering?

It's not clear if you have actually drained the bothersome 'box?

As ever with these pesky things.....always ensure you can refill before draining.


  • 0

Location:Stirlingshire.
Beware the imbecile you did not bargain for. Perhaps in a Zafira  at Tesco waiting to self combust.

 

 

 


#6 indykid

indykid

    Advanced Pedant

  • Moderators
  • PipPipPipPipPipPipPipPipPipPip
  • 10049 posts
  • Gender:Not Telling
  • Location:Dewsbury

Posted 01 September 2020 - 12:17 PM

Heat will work, but you need to be getting the gearbox casing hot, not the plug, which takes a while. If you can still touch the box casing 4" away from the plug when you've done heating and it not feel notably warm, you probably haven't heated it enough.

 

A double square socket is a better bet than mole grips and being a tapered thread on the plug, it's certainly in liquid tight if not gas tight so penetrating fluid won't help. I've linked to a 9/16" socket, but check the size before you order anything.


  • 0

#7 Zed.

Zed.

    layabout

  • Members
  • PipPipPipPipPipPip
  • 1560 posts
  • Gender:Male
  • Location:Swansea, WALES.

Posted 01 September 2020 - 12:41 PM

 tapered thread on the plug, it's certainly in liquid tight if not gas tight so penetrating fluid won't help.

+1 :thumb-up: 

 

if its chewed then a 3' Stilsons are your friend :yes: 

 

:whistle: 

 

Rich.


  • 0

50 Shades of Silver. '91 NA6CE, Not a show car :driving: 
Ohlins dampers, COP conversion, 4.778:1 & more ideas than time :yes:
Bodger :ph34r:

https://mighty5s.com...silver-na-eunos


#8 Cliddoris

Cliddoris

    Made a start

  • New Members +
  • Pip
  • 30 posts
  • Location:Belfast

Posted 01 September 2020 - 07:01 PM

Thanks for all the replies guys!

I was sensible enough to not drain the gearbox before removing the filler and to be honest, I'd be putting off the gearbox oil change a few months as I had half a mind this would happen!

It's not completely rounded off yet, I've picked up a 14" pipe wrench, will get a long piece of scaffolding pipe to slip over it and borrow a friend's lift as I won't get much movement under jack stands and frankly, I don't fancy pulling that hard on it while I'm under jack stands.

The 9/16 double square socket would have been the ticket had I not already started to round it! I'll probably pick one of them up next time if I get this out.

But the plan is to go to town on this one at some point this week, if it comes out then this gearbox is due an oil change and shifter rebuild, failing that it will probably just be driven until it fails and replaced..... Hopefully the former.

I'll report back with either a sheered filler plug or a freshly serviced gearbox.
  • 0

#9 Martin Y

Martin Y

    Happily expanding the To Do list since 1997

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 10336 posts
  • Gender:Male
  • Location:Hemel Hempstead

Posted 01 September 2020 - 08:02 PM

I do remember my first time removing that plug (and the diff plugs) I was getting nowhere until I borrowed the use of a lift.  With more room to work things that wouldn't budge suddenly did.  Only took moments to crack them loose and nip them up again before taking the car home to do the fluid changes.

 

Hope it works as well for you.


  • 0

#10 Jim A

Jim A

    Getting there

  • New Members +
  • PipPip
  • 55 posts
  • Gender:Male
  • Location:Northern California

Posted 01 September 2020 - 08:38 PM

In addition to through the fill hole, can refill your transmission through the speedometer sender hole or the driveshaft hole.


  • 0

#11 Cliddoris

Cliddoris

    Made a start

  • New Members +
  • Pip
  • 30 posts
  • Location:Belfast

Posted 01 September 2020 - 10:11 PM

In addition to through the fill hole, can refill your transmission through the speedometer sender hole or the driveshaft hole.


This is good to know, I guess the risk is that you can over fill the box.

But I imagine a slightly over filled box of fresh fluid is better than a box that has an unknown age of oil in it.
  • 0

#12 Martin Y

Martin Y

    Happily expanding the To Do list since 1997

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 10336 posts
  • Gender:Male
  • Location:Hemel Hempstead

Posted 02 September 2020 - 09:04 AM

If you use two 1 litre bottles, you won't overfill it.
  • 0




1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users