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Extractors Needed to Split Crankcase

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Extractors Needed to Split Crankcase

Posted by robert_juric at May 04. 2018

So I'm getting ready to tackle the job of splitting my Electra's crankcase.

I've read through the process and think I need 3, maybe 4 extractors to successfully pull everything apart?

According to the Twin Manual, to remove the "rotor and engine sprocket with chain and clutch", I would need extractor JEST/12 for the engine sprocket and maybe extractor 030449 for the clutch.

-Are these the same as the lightweight sprocket puller and the clutch puller pictured in the manual?

Then removing the gearbox shaft and internals doesn't appear to require any special extractors?

Finally to remove the cam wheels I would need bar extractor 24980?

-Is that the same as the lightweight cam wheel puller or the timing pinion tool, or are both needed?

 

Is there anything else I'm missing? Any recommendations on sourcing these pullers?

Re: Extractors Needed to Split Crankcase

Posted by patrick_mullen at May 04. 2018

Hello Robert,

Here is a list of special tools available in 1963 for the Jubilee/Navigator.  (The prices might have gone up a bit !!! ). This is in the Spares List.

Andy S, Peter H and Ian E know more about the Electra than me as I have never worked on one but mechanically it is pretty similar to the later Navigator except for the self-starter system .  You have the later gearbox which I have never stripped down but I am pretty sure no special tools are needed.

I have removed the engine sprocket and clutch on a number of Jubilee/Navigator engines without needing any special tools but I do have a fairly well equipped workshop and a fair amount of experience from racing and rallying.  I think I just tightened a fairly simple puller on the sprocket, then applied some heat and it always just popped off. The clutch seems to come off fairly easily as well.  The clutch and engine sprocket with the primary chain are then withdrawn as one item.

The Jubilee Maintenance Manual which is an original Norton publication seems to say it is only necessary to use special pullers "if required".  It doesn't name them or show them in the text but they are listed in the Spares List.

The cam wheels again come off easily (in all the ones I have removed) and you can make a simple puller for this. From memory there are threaded holes in the wheels for this very purpose.

Ideally if there was someone near you to borrow from as I think the sprocket puller is a little bit unusual and I think it is the same as the big twins. It will probably be very costly to buy these purely for one engine strip so maybe a visit to a machine shop would be more cost effective.

Patrick.

 

Re: Extractors Needed to Split Crankcase

Posted by patrick_mullen at May 04. 2018

Service tools

Attachments

Re: Extractors Needed to Split Crankcase

Posted by peter_holland1 at May 07. 2018

Previously robert_juric wrote:

So I'm getting ready to tackle the job of splitting my Electra's crankcase.

I've read through the process and think I need 3, maybe 4 extractors to successfully pull everything apart?

Is there anything else I'm missing? Any recommendations on sourcing these pullers?

What part of the world are you in? I'd be happy to help you with tools if you are nearby. Like Patrick says, you need to have some experience in making your own tools.

Peter Holland

Re: Extractors Needed to Split Crankcase

Posted by dan_field at May 07. 2018

For the drive side All I used was a 2 legged puller to get the rotor off, and a bit of steel bar with two small holes to match the crank sprocket and a hole in the middle for a big nut and bolt. I haven’t tried to removevanything from the other side (yet!)

Re: Extractors Needed to Split Crankcase

Posted by robert_juric at May 07. 2018

I'm in the States. I feel like I found a heck of a bike to cut my teeth on.

I understand financially it doesn't make much sense to source these tools for such limited use. However I'm young enough that I may run into the need again. I just don't have much (any) experience building tools but it's something I'm going to look into.

Re: Extractors Needed to Split Crankcase

Posted by dan_field at May 08. 2018

I don’t think you need to complete a toolmakers apprenticeship to make the kind of tools you need, it’s amazing what you can do with a bit thought and ingenuity plus a few bits of steel, nuts, washers and threaded bar !

Re: Extractors Needed to Split Crankcase

Posted by ulrich_hoffmann at May 08. 2018

I was able to split my cases without tackling the timing side gear.

But my engine was already partly dismantled , no primary chain and sprocket mounted.

IMG_20160821_105455186_HDR

IMG_20160829_125921417

Re: Extractors Needed to Split Crankcase

Posted by mike_carter at December 02. 2018

Previously Ulrich Hoffmann wrote:

I was able to split my cases without tackling the timing side gear.

But my engine was already partly dismantled , no primary chain and sprocket mounted.

IMG_20160821_105455186_HDR

IMG_20160829_125921417

Hi, about to do a strip on my Jubilee, its desperate fir a rebore and something is very loose behind the ckutch. Is there a source if these pics showing your experience please?

Re: Extractors Needed to Split Crankcase

Posted by bryon_currington at December 02. 2018

Previously robert_juric wrote:

So I'm getting ready to tackle the job of splitting my Electra's crankcase.

I've read through the process and think I need 3, maybe 4 extractors to successfully pull everything apart?

According to the Twin Manual, to remove the "rotor and engine sprocket with chain and clutch", I would need extractor JEST/12 for the engine sprocket and maybe extractor 030449 for the clutch.

-Are these the same as the lightweight sprocket puller and the clutch puller pictured in the manual?

Then removing the gearbox shaft and internals doesn't appear to require any special extractors?

The most expensive extractor to remove the half time pinion is considered

Finally to remove the cam wheels I would need bar extractor 24980?

-Is that the same as the lightweight cam wheel puller or the timing pinion tool, or are both needed?

 

Is there anything else I'm missing? Any recommendations on sourcing these pullers?

The most expensive extractor is the one to remove the half time pinion which a lot of books say is needed. If you split the cases first then there is lots of room to use a regular puller to get behind the pinion if needed to remove the bearing  Bryon

Re: Extractors Needed to Split Crankcase

Posted by francis_anderton at December 04. 2018

Previously robert_juric wrote:

So I'm getting ready to tackle the job of splitting my Electra's crankcase.

I've read through the process and think I need 3, maybe 4 extractors to successfully pull everything apart?

According to the Twin Manual, to remove the "rotor and engine sprocket with chain and clutch", I would need extractor JEST/12 for the engine sprocket and maybe extractor 030449 for the clutch.

-Are these the same as the lightweight sprocket puller and the clutch puller pictured in the manual?

Then removing the gearbox shaft and internals doesn't appear to require any special extractors?

Finally to remove the cam wheels I would need bar extractor 24980?

-Is that the same as the lightweight cam wheel puller or the timing pinion tool, or are both needed?

 

Is there anything else I'm missing? Any recommendations on sourcing these pullers?

Re: Extractors Needed to Split Crankcase

Posted by francis_anderton at December 04. 2018

I recently split an Electra crankcase The starter gear,rotor,and sprocket had already been removed.I modified a two legged puller using two 1/4" BSF bolts to remove the cam gears and a half time pinion extractor (ET 2003) All the gears were very tight particularly the half time pinion which has very little clearance behind it and definitely needed the proper extractor to remove it.

Frank Anderton

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