Yanmar — Tightening torque:

A Yanmar service procedure — check it applies to your exact model before use.

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Procedure

1. to 200 kgf+cm (14.71 to 19.61 N-m)
2. 9.2.3 Install the water alarm switch connector of the fuel filter
3. 9.2.4 Fill fuel to the fuel filter (1) Open the fuel tank cock and operate the hand pump to add fuel. (2) Operate the hand pump until further operation is felt heavy.
4. 9.2.5 Start the engine to check for fuel leakage 3-98 Disconnect the connector of the water alarm switch of the fuel filter
5. Engine Overhaul As for servicing of the fuel injection pump and fuel injection nozzle, consult the DENSO Serviceshop. Here, the servicing procedure is described for your reference.
6. 10 Fuel Injection Nozzle
7. 10.1 Components
8. Engine Overhaul
9. 10.2 Removal of Fuel Injection Nozzle [6LP-DTE series] (1) Remove the fuel injection pipe. Remove the fuel injection pipe nut from the fuel injection nozzle. (2) Remove the fuel return pipe. @ Disconnect the fuel hose from the fuel return pipe. @ Remove the six joint bolts, fuel return pipe and 12 gaskets. (3) Remove the fuel injection nozzle. @ Remove the bolt, washer, nozzle holder clamp, fuel injection nozzle and seat. @ Remove the O-ring from the fuel injection nozzle. 3-100 (6LP-DTE series]
10. Engine Overhaul [6LP-STE series] (1) Remove the bonnet (See 3.1.2.7 Remove the bonnet.) (2) Remove the link unit from the fuel injection pump and intake manifold (3) Remove the No.1 fuel return pipe @ Remove the No.1 fuel return pipe from the cylinder head. e Remove six joint bolts, a nut, seven gaskets and No.1 fuel return pipe. e Disconnect the fuel return hose from the
11. Engine Overhaul (5) Remove the nozzle holder seal
12. 10.3 Testing the Fuel Injection

Source: manual:Yanmar-6LP-DTE-Service.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.