Seized engine

[adrie.degraaff]

As John Mitchell mentioned you need 4 connections, first fill the barrels with oil, plate on, and pump them separate so the whole barrel will rise.

a brake lever of an old Japanees bike is also a good pump.

[Simon.Gardiner]

I guess I was thinking more of using a piece of wood and a mallet but then I'm just a crude singles chap, not one your more sophisticated square four types

[brenton.roy]

Beauty, it's out there! I bet half the forum readers were thinking that.
I'd add heat to the aforementioned wood and mallet, particularly if it is an iron motor.
A nice soft bit of pine and a couple of sharp raps might do wonders.
Brenton

[p tuxworth]

take the coupling gears off . and drift the pistons down

[nevhunter]

Better to work on two pistons that are opposite at the same time. Undo the base nuts and allow the block to come up as he pistons are forced down equally. You don't have to use oil. A largish long threaded bolt bearing down on a thick washer will do, and the nut is welded to a plate bolted to the gasket face where the cylinder head attaches. Nev

[ralph thetford]

Thanks everybody for your help---I have finally got the seized block off'
After soaking the bores and pistons in WD40 for about a month I did the following----
I made a jacking plate 10mm thick with four 12Mmm X 100mm jacking screws at bore centres and after putting a 6mm steel disc down each bore to spread the jacking load I fastened the plate to the top of the block.
I then screwed each screw down in turn untill tight --I then give each a tap with an hammer.
After repeating this operation around a dozen times the block came off. (the first 3-turns were very very tight but then it really started to move easily and the block quickly came off)

Regards Ralph

[nevhunter]

It will work but I would do it with two opposite pistons at the same timeto get even force. They will move to the BDC position and then( if not before) the whole thing will move up Nev