Seized Engine.

[kevmead]

Hi all,
After a bit of advice, i have recently been given a 96 plate etz 251 off a friend in bits. The engine has seized from being stood in the garden for a few years and i was after the best advice to try and un-seize the engine without a lot of expense. I have had tried tapping the piston with a bit of wood after filling it with oil but no luck. Any help would be appreciated as i am not that clever with engines to be honest.

Many thanks,

Kev

[DAVID THOMPSON]

a long soak with liquid wrench and if it does not move then
its a lot of work with a Dremel Tool
when using the wood block remember that both the piston and rings may be stuck
and a piston that has been beat on with a wood block and hammer will damage the ring groves
if it took a lot of pounding
a new piston and rings need to be on the shopping list
at rebuild
dave

[MZCountryRider]

Try filling the cylinder with a 50/50 mix of acetone and atf (automatic transmission fluid). Let it soak for a week or more and see if that helps to break it loose.

[therealche]

Two to try
1) Diesel . Just keep filling it up with diesel for a week,Give it a healthy tap... then repeat. Worked for me on a couple of well seized engines
2) Heat around 100ml of oil to smoking heat, then pour into the combustion chamber. Seems counter intuitive but I knew someone that swore by it. Something to do with thermal shock. Mind you if you have soaked in something inflammable before I would stand well back!

[Lone-Wolf]

Wotcha.

The ETZ I recently bought had seized due to standing. A mixture of diesel and penetrating oil down the plug hole, then heat the barrel with either a blowlamp or a hot air paint stripping gun. When the barrel is smoking nicely, put the bike on the centre stand, engage top gear and give the back wheel a good turning. This freed up the engine of the bike I'm using now . . . . .hasn't done it any harm ( yet ).

[DAVID THOMPSON]

when one sticks on me i like to take it apart and clean it up inside

an old BMW /2 is bad about dampness behind the valve seats in the humid wx we have here
and needs to have the spark plug removed and warm it up for a few hours or even a few days
so when it starts it does not pop the seats out .....from the steam pressure

seen this happen several times here in the valley
dave

[kevmead]

Hi all, just want to say a big thankyou foar all your advice. After soaking engine with PlusGas for 24 hrs , a bit of WD40 , bit of force with mallet and wood i have finally managed to unlock the engine.

[DAVID THOMPSON]

do take it apart for a good look
make sure you did not break a ring or mess up the piston
dave

[vicar]

Pleased you got it free,
if you are ever out on the road and get a seizure put the bike in gear and push it backwards. Its worked for me in the past when the piston was seized and I could stand on the kick start to no effect and I am a fat bloke ........