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Help With Exploded Gearbox

Craigr32
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Craigr32 Rookie

Craigr32

Posted
Posted

Hey all this is my first time posting on SAU..

Had my pressure plate and clutch explode out the side of the gearbox housing after dumping the clutch @ 5000RPM,

this shredded all the bolts off the gearbox and snapped the slave cylinder off.:blink:

Now heres the problem,

there is some damage on the crank which im not sure if it will affect the new box i put it

and 1 of the mounting points has broken off. Was wondering if 7 out of 8 bolts would be enough to hold it

the gearbox i was running was an RB30

6 bolt flywheel and standard clutch <--- was done by previous owner possible cause

now have a rb20det box and GTR 9bolt flywheel and HD clutch that i wanna put in

Can someone tell me if i should replace the block:::: pics below

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https://www.sau.com.au/forums/topic/377644-help-with-exploded-gearbox/
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89CAL Grand Master

89CAL

Posted
Posted (edited)

Ask yourself this.......

If 8 wasnt enough to hold it in the first place, do you really trust 7?

And if there is damaged to the crank I would suggest replacing the crank. Are you talking about the bolts that bolt the flywheel to the crank or the bolts that hold the pressure plate to the flywheel btw? I dont remember how many there are for each....

Have any photos?

Edited by 89CAL
Craigr32 Rookie

Craigr32

Posted
  • Author
Posted (edited)

Ask yourself this.......

If 8 wasnt enough to hold it in the first place, do you really trust 7?

And if there is damaged to the crank I would suggest replacing the crank. Are you talking about the bolts that bolt the flywheel to the crank or the bolts that hold the pressure plate to the flywheel btw? I dont remember how many there are for each....

Have any photos?

img0051eb.jpg

img0047am.jpg

img0004uv.jpg

img0003ljv.jpg

Edited by Craigr32
89CAL Grand Master

89CAL

Posted
Posted

Crank doesnt look so bad...... need a new spigot bush. But I'd get a second oppinion on wether you should run it again.

So the mounting point that has broken off is on the flywheel yes? New flywheel shouldnt be to hard to find?

Craigr32 Rookie

Craigr32

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Crank doesnt look so bad...... need a new spigot bush. But I'd get a second oppinion on wether you should run it again.

So the mounting point that has broken off is on the flywheel yes? New flywheel shouldnt be to hard to find?

yeah i think the shaft from the gearbox will slot into the crank ok but will get my mate to check it,e

The mounting point is where the gearbox itself bolts upto the Block...

Does the block look twisted at all? might be because its on axel stands but i doubt it

and yes the sprigot bush flew out amongest the carnage Lol how do i go about putting a new one in tap in with rubber mallet?

tricstar Mentor

tricstar

Posted
Posted

Crank doesnt look so bad...... need a new spigot bush. But I'd get a second oppinion on wether you should run it again.

So the mounting point that has broken off is on the flywheel yes? New flywheel shouldnt be to hard to find?

nah its one that bolts the bellhousing up, looks like a long way to the next bolt if you don't have that one, I would consider welding something on to bolt up to, but yeah new spigot bush and clean up any burs with a file and flywheel should bolt up alright,

you shore it was a standard clutch and not a standard clutch revamp?

turboedsloth Grand Master

turboedsloth

Posted
Posted

f**kin hell, lucky it didnt come through the floor and take out your feet. As said above, that spiggot bush is knackered, you would get away with that crank damage. But have any of the flywheel bolt threads been stretched?

Craigr32 Rookie

Craigr32

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  • Author
Posted

f**kin hell, lucky it didnt come through the floor and take out your feet. As said above, that spiggot bush is knackered, you would get away with that crank damage. But have any of the flywheel bolt threads been stretched?

Scared the shit out of me when it happend lol, the only bolts that were in tact are the ones that hold the flywheel to the Crank (Flywheel also cracked)

Rolls Grand Master

Rolls

Posted
Posted (edited)
Now heres the problem,

there is some damage on the crank which im not sure if it will affect the new box i put it

and 1 of the mounting points has broken off. Was wondering if 7 out of 8 bolts would be enough to hold it

What are the 'mounting bolts' you are referring to? Almost certainly 7 is not ok, there is 8 for a reason and running less even if strong enough will no doubt unbalance the system.

Where the crank is damaged this will also unbalance the system, how badly? No idea. I would be speaking to a clutch expert eg Jim Berry and ask for his professional opinion on this.

Remember 'barely damaged' and 'small' scratches might look fine but when they are spinning at 8000rpm with huge torques and forces going through them they can make a massive difference. Everything also needs to be in balance. Definitely speak to a pro about this, Jim Berry is always all to happy to help over the phone, especially if you can email him the pictures as well.

Remember if this happens again you might not be so lucky and might loose your feet, imagine what it would be like to have no feet? Don't skimp on safety!

Edited by Rolls
turboedsloth Grand Master

turboedsloth

Posted
Posted

Remember if this happens again you might not be so lucky and might loose your feet, imagine what it would be like to have no feet? Don't skimp on safety!

This right here. I've seen a tailshaft come up through a floor pan and nearly cost a man his legs. It's not pretty

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