Engine locked up - during strip down. SOLVED
 

Stripped top engine down to address valve and cam shaft issue - simple enough I thought - BUT - despite the warnings to not turn the pulley/crank backwards (anti clockwise) it happened and now I can't get a full revolution - either direction - comes to hard stop. Seems a gear has jumped / slipped?
DO I HAVE TO SPLIT THE CASE :confused:


see #5

One of the chains is bound up in the case. Carefully move the crank while wiggling the timing chains.

Suggestion ---
 

Thanks Danno
Just went and looked - yes you are right...but !
I tilted the case 90' and peered into the gear mechanism and chain on left (and upper most) was not engaging with gear/cog, engine would rotate freely - then bind if released the chain ..

Back on horizontal - locking again?Maybe I should loosely rebuild cam town and see if that corrects it ?

Is timing now screwed up too ?

You'll have to set the cam timing anyway as you reassemble, so no worries about that. If your heads and cams are still on the engine, be careful turning it over so the pistons don't hit the valves.

If you keep carefully turning the crank a small distance in each direction, you should be able to free the chains. Sometimes the chain bunches up in a hard to see spot and then jams against the case. Keep doing what you're doing, and make sure the other chain doesn't lock up while you're freeing the first one.

PROBLEM SOLVED.....
The left hand side cam chained jumped a sprocket and was catching the crank counter weight of the first cylinder ,
I didn't have the "keepers' that hold the chains in tension after the cam tower was removed ...it would appear they a not a 'nice to have' it seems !!. Will get some asap.
I hooked the chain back over the sprocket with screw driver modified into hook. (need to turn engine to get that counter weight out of the was as much as possible.
So lesson - DO NOT reverse the crank !

Just put the cam sprocket drives back on the chain and that will hold tension.
Bruce