Even if there is sufficient clearance to allow the valve to be open far enough to clear the bucket so that the shim can be withdrawn, why take the risk of rotating the crankshaft? It certainly goes against best practice.
Clearances are very close in most engines and although some engines are not interference in terms of valve train, this still does not address the possibility of ash or carbon build-up. Block a valve open & rotate the crankshaft if you wish but, IMO, it would be irresponsible to recommend that someone do this if there is a viable alternative. The shim & bucket tools are intended to slip in and depress the bucket, or at least all the motorcycle and automotive ones I can recall are of that fashion.
Some engines require that the piston be positioned away from TDC because of clearance issues. Not wishing this to sound argumentative but see no reason to risk rotating the crankshaft with shim too; in place. I've seen some valves bent during adjustment and it's not a good thing. I'd feel very bad were someone to think that I'd recommended such a practice.
I may see this differently than do some but have worked professionally in the vehicle repair industry for many years so view things from that perspective.
Clearances are very close in most engines and although some engines are not interference in terms of valve train, this still does not address the possibility of ash or carbon build-up. Block a valve open & rotate the crankshaft if you wish but, IMO, it would be irresponsible to recommend that someone do this if there is a viable alternative. The shim & bucket tools are intended to slip in and depress the bucket, or at least all the motorcycle and automotive ones I can recall are of that fashion.
Some engines require that the piston be positioned away from TDC because of clearance issues. Not wishing this to sound argumentative but see no reason to risk rotating the crankshaft with shim too; in place. I've seen some valves bent during adjustment and it's not a good thing. I'd feel very bad were someone to think that I'd recommended such a practice.
I may see this differently than do some but have worked professionally in the vehicle repair industry for many years so view things from that perspective.
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