Mase IS8 Water Pump V-Belt 71166 SPZ 722 9.7x735mm
MAS71166
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Mase IS8 Water-Pump V-Belt
71166 | SPZ 722 / 9.7 x 735 mm
Water-pump drive belt for Mase IS8-family generator installations that specify Mase part 71166. Published service information identifies the belt with the IS8/IS8.0 Yanmar 3TNE78 installation.
Key Features
- For the water-pump drive on compatible Mase IS8 sets
- SPZ 722 / approximately 9.7 x 735 mm identification
- Used with the documented Yanmar 3TNE78A-MG installation
- External V-belt; not an engine timing belt
- Single belt supplied
Technical Specs
| Part type | Water-pump V-belt |
| Belt designation | SPZ 722 |
| Published size | Approx. 9.7 x 735 mm |
| Mase reference | 71166 |
| 4Boats SKU | MAS71166 |
Compatibility / Fitment Guide
Verified generator family: Mase IS8 / IS8.0 installations whose parts list shows Yanmar 3TNE78A-MG (or 3TNE78 MG EPA) and item 71166 at the water-pump pulley.
Some IS8/IS9/IS10T documentation covers multiple electrical variants; the engine and serial-specific parts page must still show 71166. Not for Mase IS6.5/IS7.6 installations using 71183.
Part Number Cross Reference
| Mase | 71166 |
| Belt marking | FTD-SPZ 722 / 9.7 x 735 |
| 4Boats SKU | MAS71166 |
Cross-reference numbers are for identification only. Confirm the number and the engine/generator parts diagram before ordering.
Frequently Asked Questions
Will it fit an IS6.5?
No. The documented IS6.5 water-pump belt is 71183.
Is the size important?
Yes. Match both 71166 and the existing belt/pulley profile.
What engine is documented?
Yanmar 3TNE78A-MG / 3TNE78 MG EPA in the referenced IS8 parts information.
What is included?
One replacement V-belt.
Verify the complete model designation, production/series code and original part number before purchase. Professional installation is recommended for timing and drive components.
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