Yanmar 3JH5E User Manual (English)

Questions and Answers:

B
Brandon PonceJul 26, 2025
Why Yanmar Engine starter turns but engine does not start?
- B
  Benjamin WaltersJul 26, 2025
  If your Yanmar Engine's starter turns but the engine doesn't start, it might be due to several reasons. You may have no fuel, so add fuel and bleed the fuel system. The fuel filter might be clogged, so replace the filter element. It could also be due to improper fuel, so replace it with the recommended fuel. For issues with fuel injection or compression leakage, consult your authorized Yanmar Marine dealer or distributor.
W
wdillonJul 31, 2025
What to do if Yanmar Engine starter does not turn or turns slowly?
- E
  Emily HallJul 31, 2025
  If your Yanmar Engine's starter does not turn or turns slowly, and the engine can be turned manually, it may be due to a faulty clutch position. Shift to NEUTRAL and try starting again. Another reason could be insufficient battery charge, so check the fluid level, recharge the battery, or replace it if necessary. Also, check for cable terminal contact failure by removing corrosion from the terminals and tightening the battery cables. For faulty safety switch devices or starter switches, consult your authorized Yanmar Marine dealer or distributor.
S
smithmichaelAug 5, 2025
Why Yanmar 3JH5E Engine producing black smoke?
- H
  hawkinskyleAug 6, 2025
  If the exhaust from your Yanmar Engine is producing black smoke, it may be due to a few reasons. It could be that the load has increased, or there's an improper propeller matching. The intake silencer (air cleaner) might be dirty, so clean the element. Using improper fuel can also cause black smoke, so replace it with the recommended fuel. For a faulty spraying of the fuel injector, consult your authorized Yanmar Marine dealer or distributor.
I
igreenAug 10, 2025
What to do if the engine oil low pressure alarm indicator comes on in my Yanmar 3JH5E Engine?
- M
  Melissa MedinaAug 10, 2025
  If the engine oil low pressure alarm indicator comes on, it could be due to a low engine oil level. In this case, check the engine oil level and add or replace as needed. Alternatively, the engine oil filter might be clogged. Try replacing the engine oil filter and the engine oil.
W
waltersjasonAug 15, 2025
Why does the coolant high temperature alarm come on in my Yanmar 3JH5E?
- C
  Carolyn ContrerasAug 15, 2025
  If the coolant high temperature alarm comes on in your Yanmar Engine, it could be due to several reasons. The coolant level might be low, so check the coolant level and refill as necessary. Insufficient seawater can also cause the temperature to rise, so check the seawater system. If there is contamination inside the cooling system, consult your authorized Yanmar Marine dealer or distributor.
B
Briana RodriguezAug 20, 2025
What to do if indicators light on the instrument panel and alarm sounds during Yanmar Engine operation?
- W
  wellstaylorAug 20, 2025
  If indicators light up on the instrument panel and an alarm sounds during operation of your Yanmar Engine, immediately shift to low-speed operation and check which indicator has come on. Stop the engine and inspect. If you don't identify any abnormalities and there are no operational problems, return to port at the lowest speed and request repairs.

Yanmar 3JH5E Specifications

General

Number of Cylinders	3
Displacement	1.642 L
Combustion System	Direct injection
Aspiration	Naturally aspirated
Alternator	12V - 80A
Cooling System	Freshwater cooling
Starting System	Electric starting
Engine Type	Vertical, water-cooled 4-cycle diesel engine
Compression Ratio	23:1