CTP 1979386 Top Piston Compression Ring OEM 197-9386 For CAT C7 Engine

• Product Name: CAT C7 Top Fire Piston Compression Ring (1st Ring)
• CTP Part Number: 1979386
• CAT OEM Reference: 197-9386
• Ring Type: Top Primary Compression / Fire Ring
• Fit Engine: CAT C7 Diesel Engine
• Compatible Equipment: CAT 324D, 325D, 329D Excavator, 950H Wheel Loader, C7 Highway Truck Engine
• Brand: CTP Aftermarket Replacement
• Core Features

1. High-strength alloy cast iron with hard surface coating, excellent high-temperature resistance and anti-scuff performance to withstand direct combustion flame impact
2. Precision end gap and geometric profile maximizes cylinder gas sealing, minimizes blow-by gas, maintains engine compression and power output
3. Fully interchangeable dimension with original 197-9386, directly fits the top groove of C7 engine piston
4. Complete matching set with 2nd ring 1979353 and oil ring 2382706 to assemble a full 3-piece piston ring kit for single piston rebuild

CTP 1979386 top compression ring is the uppermost sealing ring on the C7 piston assembly. It bears the highest pressure and temperature from fuel combustion, acting as the primary barrier to prevent high-pressure gas leaking into the crankcase.

Wear, groove scoring or enlarged end gap on the top ring will directly cause weak acceleration, excessive crankcase ventilation, increased fuel consumption and blue smoke. It must be installed together with the intermediate compression ring and oil control ring during full engine rebuild.

We supply parts for Kubota, Cum mins, CAT, Perkins, Yanmar, Isuzu, Komatsu, Mitsubishi, Hino, Nissan, Volv o, Deutz, Doosan, Daewoo, John De ere, Scania, Hyundai, JCB etc.

1. What is the genuine CAT OEM number for this top ring?

   CTP 1979386 replaces original CAT part number 197-9386.

2. What is the installation order of the three C7 piston rings?

   1st: Top fire ring 1979386 → 2nd: Intermediate compression ring 1979353 → 3rd: Oil control ring 2382706.

3. Which CAT machines use the C7 engine with this piston ring?

   CAT 324D, 325D, 329D hydraulic excavators, 950H wheel loader and medium-duty trucks powered by CAT C7 engine.

4. Is it necessary to replace all three rings at once?

   Yes, replacing the full set of three piston rings ensures uniform sealing performance and longer service life.