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Old 11-01-18, 03:12 PM   #1
mkent
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Default JAP 3 Stuck flywheel removal

I've got a well seized JAP 3, there are no puller screw holes around the boss of the flywheel, if I lever the flywheel around the edge it looks like the steel boss will separate from the sot metal the flywheel is made of.

Am I missing anything? All thoughts welcome.

M
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Old 11-01-18, 03:42 PM   #2
Windrush
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I think that they are on a taper, try replacing the nut so that it is flush with the end of the crankshaft threads and give the nut a sharp clout with a hammer while levering the flywheel. This should 'shock' it off.

Pete.
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Old 11-01-18, 07:51 PM   #3
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Thanks for the idea Pete, I'll give it a go when I'm back at the yard this weekend.
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Old 25-01-18, 07:51 PM   #4
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An update, have done as suggested, gave the area a bit of heat, and keeping in mind that there was nothing to loose, bashed the **** out of it, and the flywheel sort of crept off...

A fire in the cylinder, more bashing with a wood drift, and the piston started moving, followed by the valves, woo hoo!

Dam, another project...
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Old 25-01-18, 08:45 PM   #5
wolseley phill
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Nice one! I don’t know if it’s typical, but the flywheel on mine was cracked and required repair - worth a close look at the hub on the back. If you haven’t already removed the timing case cover, take care when you do. There is a paxolin gear and mine did not have timing marks. Easy enough to set, but the camshaft and idler like to pop out with the cover!

The cylinder head will almost certainly be cracked, mine was but it wasn’t terminal. They need to be re-fitted with a fibre washer beneath the rocker shaft bracket.

Good little engines, enjoy!

Phill.

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Old 28-01-18, 09:42 PM   #6
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Quote:
Originally Posted by wolseley phill View Post
terminal. They need to be re-fitted with a fibre washer beneath the rocker shaft bracket.

Good little engines, enjoy!

Phill.
Hi Phill,

Rocker shaft? The engine I'm looking at is a side valve jobbie, no rockers or shafts, had a google, seen plenty of ohv model 3s, but not much on a side valve one, have I got the ID wrong?

That aside, the pulley on the other side of the crank has two chunks broken off, 180 deg apart, so I think its been got at previously (and wont't come off), piston rings are stuck with rust, but its looking better than the 2S at the moment.

M
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Old 28-01-18, 10:10 PM   #7
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You must have the later model from the 50's in that case, in which case - ignore me!

Phill.
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