Splitting gearbox from engine - it's stuck! Any advice?

Motormed · Jul 12, 2021

I've got my 1150GSA stripped to change the clutch (due to oil contamination).

I'm now ready to split the gearbox from the engine and it's started to come apart, but is stuck in one area :blast

.

The problem is at the lower right hand side, seemingly caused by corrosion at the locating dowel
(confirmed when removing the gearbox to engine bolts, the only bolt with any rust on it was at that location).
I've soaked it with penetrating oil and tried a few wacks with a wooden block and hammer but it's not budged at all.

Just for info, rear wheel and swingarm still attached with trolley jack under gearbox.
Any advice please? :nenau

hops · Jul 12, 2021

Motormed said:
I've got my 1150GSA stripped to change the clutch (due to oil contamination).

I'm now ready to split the gearbox from the engine and it's started to come apart, but is stuck in one area .

The problem is at the lower right hand side, seemingly caused by corrosion at the locating dowel
(confirmed when removing the gearbox to engine bolts, the only bolt with any rust on it was at that location).
I've soaked it with penetrating oil and tried a few wacks with a wooden block and hammer but it's not budged at all.

Just for info, rear wheel and swingarm still attached with trolley jack under gearbox.
Any advice please?

Try some localised heat, like a paint stripper gun and the biggest rubber mallet you can find.

Motormed · Jul 12, 2021

Thanks hops, I'll dig the heat gun out tomorrow. The big rubber mallet's already out! :beerjug:

Steptoe · Jul 12, 2021

Pry bar in the clutch housing where the starter motor located..... also try removing the trolley jack from under the gearbox, lift/force up the final drive as far as you can and ‘bang it up hard’ a couple of time, and let it drop down, usually does the trick. .

Motormed · Jul 13, 2021

Thanks for the tips, Steptoe. :beerjug:

I've booked a half day from work so hopefully will have something positive to report tonight.

DrFarkoff · Jul 13, 2021

If you haven't already Tie the centre stand forward to the front wheel

And unless you have someone there to help maybe scree a couple of the longer bolts into the top couple of holes, basically if it does let go quickly you don't drop the gearbox onto the ground and crack the casing or bend your clutch pushrod, which will likely be stuck anyway and you will need to wheel the gearbox back off it

You can try just moving the rear wheel from side to side If you can slide it on the garage floor a couple of thumps to the left usually cracks it loose

Motormed · Jul 13, 2021

Wise words, Dr Farkoff, thank you :beerjug:

.

In the interests of health & safety, the centrestand is already ratchet-strapped to the front wheel and two headless m8x150 bolts inserted in the middle holes of gearbox mounting.
I've tried moving the wheel side to side with no joy but the bike was moving a bit so I might call for some help to hold the bike for me later!

Motormed · Jul 13, 2021

Hops, Steptoe and DrFarkoff - I owe you all a pint!
:bow

After using a combination of all your suggestions, the bastard slowly came apart.
No damage or injuries, just a bit of sweating and swearing!!
Also a firm believer in walking away and leaving it for a while if something isn't working.

Just need to inspect everything now and make a shopping list for Motorworks.

Thanks again for your input fellas

Posh Pete · Jul 13, 2021

It's a handy old forum this! :beerjug:

Ian J Hartley · Jul 13, 2021

You might want to consider adding some of this to your shopping list.

I use it to coat all the threads on my fasteners, except those requiring loctite or where it is expressly forbidden (ie wheel bolts). It help prevents future corrosion. Much better than copperslip.

West coast gser · Jul 13, 2021

Is that a hairline crack running thru the circle of the part number ?

Neil W · Jul 13, 2021

Nah, looks like a bristle off a cleaning brush

walkingpictures · Jul 13, 2021

Motormed said:
Hops, Steptoe and DrFarkoff - I owe you all a pint!

After using a combination of all your suggestions, the bastard slowly came apart.
No damage or injuries, just a bit of sweating and swearing!!
Also a firm believer in walking away and leaving it for a while if something isn't working.

Just need to inspect everything now and make a shopping list for Motorworks.

Thanks again for your input fellas

Good result,group hug needed :Duchess

Motormed · Jul 13, 2021

Yep, big group hug, I like it!
Thanks for the Moly suggestion, Ian.
And yes, Neil, it's a bristle from my cleaning brush :clap

johnnyboy · Jul 13, 2021

Motormed said:
Yep, big group hug, I like it!
Thanks for the Moly suggestion, Ian.
And yes, Neil, it's a bristle from my cleaning brush

It would have been good to see your initial reaction about the hairline crack

Sent from my SM-G970F using Tapatalk

Motormed · Jul 13, 2021

johnnyboy said:
It would have been good to see your initial reaction about the hairline crack

Sent from my SM-G970F using Tapatalk

Thought it was a pube to start with (but not mine!!).

Splitting gearbox from engine - it's stuck! Any advice?

Motormed

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hops

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Motormed

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Steptoe

What a waste.

Motormed

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DrFarkoff

Grumpy Ole Git!!!

Motormed

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Motormed

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Posh Pete

Still got a pulse.

Ian J Hartley

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West coast gser

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Neil W

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walkingpictures

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Motormed

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johnnyboy

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