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Yanmar 4JH3-HTE Crankshaft Pulley change to serpentine
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My 2004 SM with the 4JH3 100hp Yanmar still has original alternator setup ex Amel. 185 Leece Neville on 2 belts for 24v and Hitachi 80 on single belt for 12v. Only mod is a Sterling regulator on the 24v since 2016.
Have just installed 600ah of lithium, which the Sterling handles just fine thus far. Only issue is belt slippage at startup for a short period, limiting initial engine rpms to about 1200. I would like to ,therefore, to install a serpentine belt system to the Leece Neville. I have obtained a serpentine pulley[ 8 groove] for the LC itself but having trouble finding a replacement pulley 8 groove for the Yanmar crankshaft. I have no need of a 4 grand complete replacement alternator system as my Cerbo tells me the LC is cranking out over 2kw on bulk, so a simple pulley replacement would fill the bill. Any suggestions would be welcome. I am US based, currently in Greek waters Many thanks in advance George , on COCO, SM 434 |
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Hi George,
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Have the crank pulley machined to match the 8 groove you have found for the alternator. I did this on my 54. Used to run on twin v belts, creating dust and heat. Now no dust, no heat. Calculate the pulley ratios such that you do not exceed the rated maximum for the alternator at wide open throttle on the engine. Best Nick Amelia AML 54-019 Leros Gr 
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