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Yanmar Marine Pleasure Boat Engine Help
Engine Parts Descriptions
The photos below contain descriptions of 3JH3E engine parts and are common to most engines. They are intended to help us both talk about the same thing. They are 1280x960 pixel resolution so they're ' huge ' and will open in a separate window. If you have a deadly slow internet connection you may want to give these a miss.
Parts Descriptions
| A | Thermostat housing |
| B | Fuel filter with lift pump on top |
| C | High pressure injector pipes come from the fuel injection pump and go to the injectors |
| D | Low pressure fuel leak off pipes, returning unused fuel to the fuel system |
| E | Electric stop solenoid (option) |
| F | Rocker cover (remove this to set the valve clearances) |
| G | Data plate with model name and engine serial number |
| H | Crankcase breather filter cover. (Doesn't usually need servicing) |
| I | Heat exchanger core end caps. Remove and clean inside when temperature
is consistently higher than normal. |
| J | Oil filler cap |
| K | Heat exchanger cap (Radiator cap) |
| L | to overflow bottle |
| M | High temperature alarm switch |
| N | 3/8 PT (metric or British) plug for hot water cylinder connection |
| O | alternator belt adjusting support bar |
| P | fresh water pump |
| Q | alternator |
| R | mixing elbow (exhaust hose connects here) |
| S | drain cock for coolant from heat exchanger |
| T | drain cock for raw water |
| U | tacho sensor |
| V | starter motor |
| W | starter retaining bolt. (the negative cable from the battery usually goes here) |
| X | raw water pump |
| Y | starter relay |
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