Hi all, The Hunter 380 that I bought last year has a defective rim seal for the seawater impeller that mandates a bead of gasket caulk to keep it from leaking. I also am concerned the broken edges might eat the impeller. I'm thinking to replace the whole pump but not seeing how to access the lower starboard bolt that mounts it to the engine. It is really smashed in a tight space. sail sfbay wrote in another thread about jacking the engine up to gain access to that last bold. Does anybody have a less dramatic solution? My service manual offers nothing.
Seawater pump replacement on Yanmar 3JH3E
- Thread starter joelm100
- Start date
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- Tags
- 3jh3e hunter 380 seawater pump
Well, turns out it wasn't a big deal, but I did still curse a few engine designers. That lower starboard bolt backs out against the engine mount, necessitating removing the engine mount at the engine:
After removing the engine cover/ladder (pull the gas-strut first), I supported the engine with a ratcheting strap off the boom. No need to actually lift the engine, just support it. In fact, I probably didn't need to support the engine, given the engine is still supported by the other 3 mounts. I loosened the upper 15/16" engine mount nut, then removed the lag bolts (14mm) holding the lower mount to the hull. This allowed me to rotate the lower part of the mount enough to access the 14mm bolts attaching the upper engine mount to the engine. I pulled the alternator, just for access, but probably don't need to. Then it was all lickety-split easy. The pump comes off with 12mm socket; expect a tablespoon of engine oil to dribble out. Prep the gasket surface, new pump in, redo engine mount, alternator on, go sail. Before you start, remember to close your seawater intake, label your alternator wires, and have a rag handy. Don't adjust the lower nut on the mount that the engine actually rests on; it is set to align the engine with the transmission/prop shaft. This is probably exactly what sail sfbay
After removing the engine cover/ladder (pull the gas-strut first), I supported the engine with a ratcheting strap off the boom. No need to actually lift the engine, just support it. In fact, I probably didn't need to support the engine, given the engine is still supported by the other 3 mounts. I loosened the upper 15/16" engine mount nut, then removed the lag bolts (14mm) holding the lower mount to the hull. This allowed me to rotate the lower part of the mount enough to access the 14mm bolts attaching the upper engine mount to the engine. I pulled the alternator, just for access, but probably don't need to. Then it was all lickety-split easy. The pump comes off with 12mm socket; expect a tablespoon of engine oil to dribble out. Prep the gasket surface, new pump in, redo engine mount, alternator on, go sail. Before you start, remember to close your seawater intake, label your alternator wires, and have a rag handy. Don't adjust the lower nut on the mount that the engine actually rests on; it is set to align the engine with the transmission/prop shaft. This is probably exactly what sail sfbay
