CrimpComponent folio · Engine · Yanmar
4JH2E
Yanmar 4JH2E — 50 HP / 36.8 kW @ 3600 RPM, 4-cyl 1817 cc naturally aspirated (bore 82 × stroke 86 mm). 2.0 kW starter cranks at ~180 A (360 A inrush); 55 A Hitachi internally regulated alternator. Predecessor to the 4JH4 series; common in 35–42 ft cruising sailboats.
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Engine 50HP — Yanmar 4JH2E · 3 terminals
01 — Reference run
A sizing result with its assumptions attached.
Conductor120 mm²4/0 AWG
Fuse350 Apositive run
Voltage drop1.3%3 m one way
Design current180 A12 V system
The Crimp engine applies its ordinary continuous-load headroom, voltage-drop budget, terminal clamp, and standard fuse ladder. The 3 m one-way run is a stated reference, not a universal installation prescription.
02 — Catalog specification
The part the engine actually sees.
- Continuous draw
- 180 A
- Rated output
- 55 A
- Surge current
- 360 A
- Canvas footprint
- 220 × 130 px
Terminal map
| Terminal | Polarity | Direction | Rating |
|---|---|---|---|
| Starter | positive | input | 600 A |
| Alt B+ | positive | output | 200 A |
| Block GND | ground | bidi | 600 A |
03 — Supporting parts
What belongs around it.
- 6 m total of 120 mm² (4/0 AWG) marine cable
- Four 120 mm² cable lugs matched to the equipment studs
- 350 A fuse and holder on the positive run
- Heat-shrink, strain relief, and terminal boots sized to the cable
See what it changes in your system
With JavaScript enabled, describe your existing boat, van, or off-grid system here. The model supplies topology; Crimp's engine computes the attachment, resized runs, checks, and supporting basket.