"The name ‘barring engine’ comes from the fact that in the earliest engine the turning of the flywheel was effected by inserting a heavy bar in a slot in the flywheel and by means of a fulcrum point, physically bar the flywheel round one slot. By repeating this operation the engine could be positioned properly. As engines increased in size this became too hard and steam barring engines were fitted. The third and easiest way is to decide which end of one of the cylinders was about to come on to the power stroke and manually open the steam valve using a large spanner thus forcing the engine over it’s first stroke. Once this had happened the valve gear took over and your engine was away and running."
http://oneguyfrombarlick.co.uk/link.asp?TOPIC_ID=890&view=la...

"Barring is manually turning the entire works by applying a large pry-bar to special sockets in the flywheel."
http://www.esemag.com/1198/histori.htm

" Removing #1 cylinder valve cover and barring the engine clockwise until- the exhaust valve starts to close will make locating engine TDC faster as described later in step 4.



3. Insert the barring tool through the access hole and into the flywheel housing.

4. While holding tension on the timing pin (toward front of engine), slowly, rotate the engine with the barring tool. Hold a slight rearward (pushing) pressure on the barring tool and rotate the tool counterclockwise until the timing pin drops into the machined hole in the back of the camshaft gear."
http://dodgeram.info/tsb/1994/18-10-94a.htm

"Réglages 203 -
... une jauge dans le puit de bougie du cylindre N°1. - Faire tourner le moteur à la main pour trouver le point mort haut (cylindre N°1). - Redescendre de 3 mm. ...
station203.free.fr/entretien/reglages/reglages.html - 7k - Cached - Similar pages

panne courroie de transmission -
... D´abord remettre une courroie et faire tourner le moteur à la main pour voir si quelque chose calle. ... un point mort haut très net sur un cylindre si possible ...
www.histomobile.com/histomob/ forum3.asp?level=2&meteo=1483 - 12k - Cached - Similar pages

RESTAURATION -
... Par gommé: tu entends différence de couleur sur les parois du cylindre en vertical ??? . ...
Faire tourner le moteur à la main, une dizaine de tours. ...
www.histomobile.com/histomob/ forum3.asp?level=2&meteo=190

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Note added at 41 mins (2005-02-11 07:09:39 GMT)
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\"à la main\" ne veut pas dire sans l\'aide d\'un outil:

\"Mettre un peu d\'huile quelques jours avant de tenter de démarrer, puis faire tourner le moteur à la main (avec une clé prise sur le boulon du volant moteur, méfiance s\'il n\'est pas claveté ou cannelé, cependant :o|) pour gentiment décoller les segments :)\"
http://forum-auto.com/sqlforum/section5/sujet162324.htm

On peut aussi se servir le la manivelle si le moteur le permet

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Note added at 41 mins (2005-02-11 07:10:21 GMT)
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de la manivelle