Cylinder Head

Cylinder Head





Install cylinder head, follow the steps below to tighten cylinder head bolts in numerical order as shown.
Step a 40 Nm (4.1 kg-m, 30 ft-lb)
Step b 100° clockwise
Step c Loosen to 0 Nm in the reverse order of tightening.
Step d 40 Nm (4.1 kg-m, 30 ft-lb)
Step e 100° clockwise
Step f 100° clockwise





<-: Engine front

CAUTION: Check and confirm the tightening angle by using Tool (A) or protractor. Never judge by visual inspection without the tool.

Tool number: KV10112100 (BT-8653-A)

Cylinder Head Bolts Outer Diameter





Cylinder head bolts are tightened by plastic zone tightening method. Whenever the size difference between "d1" and "d2" exceeds the limit, replace them with a new one.
Limit ("d1" - "d2") 0.15 mm (0.0059 in)
If reduction of outer diameter appears in a position other than "d2", use it as "d2" point.

Cylinder Head Distortion

NOTE: When performing this inspection, cylinder block distortion should be also checked.

Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a scraper.

CAUTION: Use utmost care not to allow gasket debris to enter passages for engine oil or water.





At each of several locations on bottom surface of cylinder head, measure the distortion in six directions using straightedge (A) and feeler gauge (B).
Limit 0.1 mm (0.004 in)
If it exceeds the limit, replace cylinder head.