(4) Place ring in the cylinder bore and push down
with inverted piston to position near lower end of the
ring travel. Measure ring gap with a feeler gauge fit-
ting snugly between ring ends (Fig. 25).
RING GAP MEASUREMENT CHART
ITEM SPECIFICATION
Top Compression Ring 0.229 - 0.610 mm
(0.0090 - 0.0240 in.)
Second Compression
Ring
0.483 - 0.965 mm
(0.0190 - 0.080 in.)
Oil Control Ring 0.254 - 1.500 mm
(0.010 - 0.060 in.)
(5) The oil control rings are symmetrical, and can
be installed with either side up. It is not necessary to
use a tool to install the upper and lower rails. Insert
oil rail spacer first, then side rails.
(6) Using a ring expander, install compression
rings with manufactures designation pointing toward
piston crown (Fig. 26).
Ring Gap Orientation
• Position the gaps on the piston as shown (Fig.
27).
• Oil spacer - Gap on center line of piston skirt.
• Oil rails - gap 180° apart on centerline of piston
pin bore.
• No. 2 Compression ring - Gap 120° from top oil
rail gap.
• No. 1 Compression ring - Gap 120° from No. 2
compression ring gap.
Fig. 25 Gap Measurement
1 - FEELER GAUGE
Fig. 26 Compression Ring Installation
1 - COMPRESSION RING
2 - RING EXPANDER RECOMMENDED
Fig. 27 Ring Gap Orientation
1 - TOP COMPRESSION RING
2 - BOTTOM COMPRESSION RING
3 - TOP OIL CONTROL RAIL
4 - OIL RAIL SPACER
5 - BOTTOM OIL CONTROL RAIL
6 - IMAGINARY LINE PARALLEL TO PISTON PIN
7 - IMAGINARY LINE THROUGH CENTER OF PISTON SKIRT
9a - 38 ENGINE WG
PISTON RINGS (Continued)
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