WORKSHOP MANUAL W26 Wärtsilä NSD Nederland B.V. Engine type W26
Chapter 2.7
Subject Cylinder head with valves
Issue date June '00
Fitting of valve seats/valve guides/yoke pins/injector bush Note: Wear always full face protection and special working gloves to avoid burns when working with fluid nitrogen or deeply frozen parts! General: 1) Preheat the cylinder head for ca. 25 min on 90°C ± 10°C before fitting valve seats / valve guides / yoke pins / injector bush. Valve guides: 2) Cool the valve guide down to -150°C. 3) Fit the valve guide in the cylinder head. Yoke pins: 2) Cool the yoke pin down to -150°C. 3) Fit the yoke pin in the cylinder head. 4) Check the free length of fitted yoke pins (85 ± 0.5 mm). Exhaust valve seats: 2) Cool in a freezer the exhaust valve seat down to -50°C. 3) Lubricate O-ring 1501ZT237 with O-ring grease (Parker Super-O-Lube), and place the O-ring in cylinder head. 4) Smear Loctite 290 on the outer rim of the exhaust valve seat, and fit the valve seat in the cylinder head with tool 14020TD900. Note: Check always the cylinder head on water leakage after fitting the exhaust valve seats by 7 bar water pressure during 15 min. (use tool 14030TD900). Inlet valve seats: 2) Cool the inlet valve seat down to -150°C. 3) Fit the inlet valve seat in the cylinder head with tool 14020TD900. Injector bush: 2) Cool in a freezer the injector bush down to -50°C. 3) Smear Loctite 290 on the outer rims Φ 72mm and Φ 48mm of the injector bush, and fit the injector bush in the cylinder head with tool 14020TD900. Note: Check always the cylinder head on water leakage after fitting the injector bush by 7 bar water pressure during 15 min. (use tool 14030TD900)
192
