
2670191
2598183
3-320
Engine Tools
Pistons, Rings and Connecting Rods
Piston Ring Groove Gauges
Model: 3500B Engines: Serial Numbers 7TR, 2GR, and 7RN
Warranty: Six Months
• Used to quickly and accurately
check 278-0247 Monotherm Piston
RingGroovesforwear
• Uses a simple Go/No-Go design (if
piston passes through gauge it can-
not be reused)
• Improvesreliabilityofinspection
and reduces inspection time
• Gauge repair and recalibration
done only by manufacturer (dam-
aged blades can be replaced and
adjustable design allows gauge to
be easily recalibrated)
References
NEHS0909, Tool Operating Manual
SEBF8059, Procedure to Clean and
Inspect One-Piece Pistons
Part No. Description Used On
329-2630 RingGroove
Gauge
top piston ring
groove
329-2631 RingGroove
Gauge
second piston
ringgroove
Piston Ring Groove Gauges
Model: C175 Engines
Warranty: Six Months
• Usedtocheckpistonringgrooveweartodetermineus-
ability of C175 Engine piston
• SimpletouseGo/No-Godesign.Ifthescribelineisvisible,
thenthepistonringgrooveisgood.Ifthelineisnotvis-
ible, then the piston is nonreusable.
• Threeseparategaugescheckallthreepistonringgrooves
• Gauges clearly marked with TOP RING, SECOND RING,
andOILRINGforeasyidentication
• Made from heat treated steel for wear resistance
• Size (length x width): 75 x 19 mm (3.0 x 0.75 in)
• Hole in each gauge [0.125 mm (0.250 in)] allows gauges to
be grouped together on a tether
Item Part Number Description
1 327-8644 RingGrooveGauge(topring)
2 327-8645 RingGrooveGauge(secondring)
3 327-8646 RingGrooveGauge(oilring)