Hino S5-LJ05E04A Workshop Manual page 31

2. PRECOAT BOLT
(1) Reapply locking agent if:
a. a precoat bolt has been removed, or
b. a precoat bolt has been turned during a tightening check or other activities. (loosened or tightened)
HINT
•
A precoat bolt is a bolt of which threads are applied with seal locking agent.
•
Conduct a torque check with the lower limit of a permissible tightening torque range. If a bolt has been
turned or rotated, follow the procedures below to retighten a bolt.
(2) Steps for reusing precoat bolt lock
a. Clean a bolt and a screw hole. (Also clean a screw hole if replacement is made.)
b. Use air blower to dry out.
c. Apply specified seal locking agent to bolt threads.
3. PLASTIC-REGION TIGHTENING METHOD (TURNING ANGLE CONTROL)
NOTICE
• Some of engine parts employ the plastic-region tightening method.
• Said tightening method is different from the conventional tightening method. Follow the instructions
described in this document for tightening.
EXAMPLE OF WORK
ONE TURN BY 90
TIGHTEN
BY 90
(1) Applicable parts
Cylinder head bolt, crankshaft main bearing cap bolt, connecting rod bearing cap bolt, and etc.
NOTICE
Prior to installation, measure a total length of a bolt. If a measurement reading of a total length exceeds the ser-
vice limit, replace the bolts.
In installation work, apply engine oil to a bolt seat surface and bolt threads.
(2) Tightening after tightening with seating torque
Tighten to the angle specified in this document: i.e. tighten another 90, 135 (90 once and then 45 once) or 180
(90 twice).
GENERAL INTRODUCTION
ONE TURN BY 90
TIGHTEN BY 45
ONE TURN BY 45
(2ND TURN)
TIGHTEN BY 90
(1ST TURN)
SEAL LOCKING AGENT
TWO TURNS BY 90
TIGHTEN BY 90
(1ST TURN)
1–27
SHTS01ZZZ0000040
TIGHTEN BY 90
(2ND TURN)
SHTS01ZZZ0000041