Yanmar Pleasure Boat Marine Engine Help

Propeller Selection - 4JH2 and 4JH3 Series

• The propeller rotation must be as shown or the transmission will fail.
• Any propeller fitted to a saildrive must have a center rubber bush, the same as an outboard motor, or the life of the saildrive leg could be seriously reduced.
• Propeller pitch is determined by boat speed and is calculated for individual boats.
• * 4JH2CE and 4JH3-TCE * You need to check that there is adequate clearance to swing an 18" diameter prop after the leg is installed.
• You may notice discrepancies between prop dimensions as the numbers have been rounded to the nearest prop size normally available from a prop maker. If you find anything that looks wrong, please email me.

Engine model	Gearbox		Propeller diameter		Propeller rotation
	model	ratio	Inches	millimeters	Left or Right hand
4JH3E	KM3P4	2.36	17	430	RH
		2.61	18	460	RH
4JH3E	KBW20-1	2.17	16	410	RH
		2.62	18	460	RH
		3.28	20.5	520	RH
4JH3BE down angle	KM3A	2.33	17	425	RH
		2.64	18	460	RH
4JH3BE down angle	KM4A1	1.47	13	325	either
		2.14	16	400	either
		2.63	18	460	either
		3.30	21	520	either
4JH3CE saildrive	SD40	???	18*	460*	left hand
4JH3-TE	KBW21	2.17	17	430	RH
		2.62	19	480	RH
4JH3-TCE saildrive	SD40-T	???	18	450	left hand
4JH3-THE down angle	KMH4A	2.04	16.5	420	either
		2.45	18.5	470	either
4JH3-TBE down angle	KM4A	1.47	14	350	either
		2.14	17	430	either
		2.63	19	480	either
		3.30	22	560	either
4JH3-HTE	KBW21	2.17	18	460	RH
		2.62	20	510	RH
4JH3-HTHE down angle	KMH4A	2.04	17	440	either
		2.45	19	490	either
4JH3-HTBE down angle	KM4A	1.47	x	410	either
		2.14	18	460	either
		2.63	20	510	either
		3.30	23	590	either
4JH3-DTHE down angle	KMH4A	2.04	18	460	either
		2.45	20.5	520	either
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