10-16
• ROCKER ARM I.D.
• ROCKER ARM-TO-ROCKER SHAFT CLEARANCE
• VTEC ROCKER ARM ASEMBLY INSPECTION
(BF150A only)
Check of stuck rocker arm assembly at high lift side:
1) Remove the cylinder head cover (P. 10-2).
2) Put the No.1 piston at the top dead center of the
3) Move the secondary rocker arm of the No.1 cylinder up and
down with a finger. Check that the secondary rocker arm
moves independent from the mid rocker arm.
• If it does not, remove and disassemble the rocker arm
• If the rocker arm assembly is not normal, replace the
rocker arm as an assembly.
4) Repeat the step 2 and 3 on each cylinder to put the piston
of each cylinder at the top dead center of its compression
stroke. Check the secondary rocker arm.
5) Install the cylinder head cover (P. 10-40).
Check of stuck rocker arm assembly at low lift side:
• Before performing inspection with the special tool(s), check
that the secondary rocker arm moves independently. (See
Check of stuck rocker arm assembly at high lift side.)
• Check with the special tool(s) can be made on the following
conditions.
– At cylinder head disassembly
– Engine power drops significantly at high rpm but the cause
of the problem cannot be identified by following the
troubleshooting chart.
1) Start the engine and let it warm up for five minutes.
2) Remove the cylinder head cover (P. 10-2).
3) Check the valve clearance (P. 3-9).
NOTICE
NOTICE
[2]
SECONDARY
ROCKER ARM
[1] MID ROCKER ARM
STANDARD
SERVICE LIMIT
IN
17.019 – 17.035 mm
(0.6700 – 0.6707 in)
EX
17.012 – 17.039 mm
(0.6698 – 0.6708 in)
STANDARD
SERVICE LIMIT
IN
0.025 – 0.052 mm
0.08 mm
(0.0010 – 0.0020 in)
(0.003 in)
EX
0.018 – 0.056 mm
0.08 mm
(0.0007 – 0.0022 in)
(0.003 in)
If the measurement exceeds the service limit, replace the
rocker arm as an assembly and recheck.
If the measurement still exceeds the service limit, replace the
rocker shaft.
