Subsection 08 (TOP END)
vmr2016-033-006
CORRECT POSITION OF THE PISTON CIRCLIP
PISTON RINGS
Removing the Piston Rings
Remove the piston (see
PISTON
in this subsec-
tion).
Inspecting the Piston Rings
Ring/Piston Groove Clearance
Using a feeler gauge measure each ring/piston
groove clearance. If the clearance is too large, the
piston and the piston rings should be replaced.
RING/PISTON GROOVE CLEARANCE
UPPER COMPRESSION RING
NEW
0.025 mm to 0.070 mm
(.001 in to .0028 in)
570
engine
SERVICE
LIMIT
0.100 mm (.0039 in)
NEW
0.030 mm to 0.070 mm
(.0012 in to .0028 in)
850 and
1000R
engines
SERVICE
LIMIT
0.150 mm (.0059 in)
LOWER COMPRESSION RING
NEW
0.020 mm to 0.060 mm
(.0008 in to .0024 in)
All
engines
SERVICE
LIMIT
0.150 mm (.0059 in)
OIL SCRAPER RING
NEW
0.010 mm to 0.180 mm
(.0004 in to .0071 in)
All
engines
SERVICE
LIMIT
0.250 mm (.0098 in)
1
R400m
o
tr103A
2
1. Piston
2. Feeler gauge
Ring End Gap
RING END GAP
UPPER COMPRESSION RING
NEW
0.10 mm to 0.30 mm
(.004 in to .012 in)
570
engine
SERVICE LIMIT
0.50 mm (.02 in)
NEW
0.20 mm to 0.35 mm
(.008 in to .014 in)
850
engine
SERVICE LIMIT
0.60 mm (.024 in)
NEW
0.20 mm to 0.40 mm
(.008 in to .016 in)
1000R
engine
SERVICE LIMIT
0.60 mm (.024 in)
LOWER COMPRESSION RING
NEW
0.35 mm to 0.55 mm
(.014 in to .022 in)
570
and 850
engines
SERVICE LIMIT
0.85 mm (.033 in)
NEW
0.20 mm to 0.40 mm
(.008 in to .016 in)
1000R
engine
SERVICE LIMIT
0.70 mm (.028 in)
OIL SCRAPER RING
NEW
0.20 mm to 0.70 mm
(.008 in to .028 in)
All
engines
SERVICE LIMIT
1.00 mm (.039 in)
To measure the ring end gap place the ring
in the cylinder in the area of 8 mm to 16 mm
(5/16 in to 5/8 in) from top of cylinder.
NOTE:
In order to correctly position the ring in the
cylinder, use piston as a pusher.
Using a feeler gauge, check ring end gap. Replace
ring if gap exceeds specified tolerance.
Installing the Piston Rings
For installation, reverse the removal procedure.
Pay attention to the following details.
NOTE:
First install spring and then rings of oil
scraper ring.
vmr2016-419
25