Subaru EH09-2D, Service Manual

Page: 27 / 47

– 25 –
2-3-8 CYLINDER HEAD
(1) Clean carbon and gum deposits from the valves, seats, ports and guides. Inspect valves, valve seats
and valve guides.
(2) Replace valves that are badly burned, pitted or warped.
(3) When installing valves in cylinder head, oil the valve stems and insert them into valve guide.
Then place cylinder head on flat table, install valve spring and spring retainer.
(4) Valve guides should be replaced when valve stem clearance exceeds specifications
(See “SERVICE DATA”).
Draw valve guides out and press new guides in.
Refer to “SERVICE DATA” for clearance specifications.
After replacing valves and guides, lap valves in place until a uniform ring shows around the face of the
valve. Clean valves and wash cylinder head thoroughly.
(5) Install cylinder head onto cylinder with new head gasket.
Tighten four flange bolts evenly in three steps by the following tightening torque :
Cylinder head M8 x 60 mm sus bolt + washer : 1 pc.
M8 x 55 mm flange bolt : 1 pc.
M8 x 55 x 25 mm flange bolt : 1 pc.
M8 x 55 x 12.5 mm flange bolt : 1 pc.
Tightening torque
19 - 21 N•m
(190 - 210 kgf•cm)
(13.7 - 15.2 ft•lb.)
10 N•m
(100 kgf•cm)
(7.2 ft•lb.)
5.0 N•m
(50 kgf•cm)
(3.6 ft•lb.)
3 rd step 2 nd step 1 st step