Yanmar compression release question

[m***@gmail.com]

MY dad's new yanmar 3 cylinder, 24HP diesel he's installing in his
boat has individual compression release levers. It has no means to
hand crank the engine for manual start and the engine manual says use
the fuel cut off to shut down the engine. So, what the heck are the
compression releases for?
Any clues appreciated.

They would be used to help start the engine by hand. You would engage
the
compression levers on all cylinders, then you can get the engine
spinning
by hand, and then quickly dis-engage the compression release levers.
Donald Palmer
M/V 'The Energizer'
Albin 25' w/ 36hp Volvo
Cape Coral, Fl.

I find myself troubleshooting a pair of "hard starting" 3JH3E's...can anyone tell me where I would find the decom-valves?? I have looked over the service manual and ops manual and can't seem to find any references. Could just be me but there you have it.
Thanks,

[Marc Auslander]

To bleed the feeds to the injectors I release the compression, crank
the engine while I loosen the nuts at the injectors until fuels drips
and then close them.