Yanmar 6LY2-STE — Engine Disassembly Procedure (Chapter 10, Sections 3-1.8 through 3-1.26)

For the Yanmar 6LY2-STE.

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Procedure

1. 3-1.8 Removing the Intercooler: (1) Remove the intake rubber hoses (Air duct-intake manifold, and turbocharger). (2) Remove the sea-water rubber hoses (Sea water pump-Inter cooler-Lube oil cooler). (3) Remove the intercooler.
2. 3-1.9 Removing the starting motor: Remove the starting motor from the flywheel housing.
3. 3-1.10 Removing the alternator: (1) Loosen the alternator adjuster bolt and remove the V-belt. (2) Remove the adjuster from the fresh water pump, and remove the alternator from the gear case (with distance piece).
4. 3-1.11 Removing the cooling water pipe: (1) Remove the cooling water (sea water) pipe (lube oil cooler). (2) Remove the cooling water (fresh water) pipe (fresh water tank-fresh water pump, fresh water tank pump-fresh water cooler). (3) Remove the cooling water pipe (lube oil cooler-marine gearbox).
5. 3-1.12 Removing the cooling water pipe: Remove the fresh water tank and fresh water cooler with packing.
6. 3-1.13 Removing the lube oil cooler (sea water pump-lube oil cooler).
7. 3-1.14 Remove the fresh water tank and fresh water cooler.
8. 3-1.15 Remove the bonnet and rocker arm assy.
9. 3-1.16 Remove the fuel injection nozzle.
10. 3-1.17 Remove the cylinder head. Ceramic tappet is used only on the exhaust side. When disassembling the engine, remove the cam shaft without touching the tappet. Do not jar or hit the tappet in any way.
11. 3-1.18 Remove the marine gear.
12. 3-1.19 Remove the front pulley, and fresh water pump pulley.
13. 3-1.20 Place a wooden plank on the ground, and lay the cylinder block upside down on it. The feet of the cylinder block should rest firmly on the wooden surface. Care should be taken to position the cylinder block securely so that it will not become scratched or damaged.
14. 3-1.21 Remove the oil pan and the intermediate for the oil pan.
15. 3-1.22 Loosen the connecting rod bolt and remove the big end bearing cap. Turn the crank and remove the cylinders one at a time.
16. 3-1.23 Remove the lube oil pump.
17. 3-1.24 Loosen the attachment bolt for the main bearing cap. After doing this, perform the following.
18. 3-1.25 Remove the crank shaft.
19. 3-1.26 Take out the connecting rod and remove the piston.

Source: manual:Yanmar-6LY2-STE-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.