Sierra 18-6275-1 Starter, Late Model GM 14 Inch Flywheel, Replaces 3857747, 3860566
Sierra 18-6275-1 Starter, Late Model GM 14 Inch Flywheel, Replaces 3857747, 3860566
The Sierra 18-6275-1 is a permanent magnet gear reduction starter built for late model GM 14 inch flywheel inboard marine engines. It is designed as a direct fit replacement, engineered to meet SAE J1171 marine ignition protection standards so it can be safely used around gasoline engine compartments and fuel vapors. The starter is rated at 1.7 KW and uses a 2 long bolt offset mounting pattern to match the original starter's bolt spacing on the engine block.
As a permanent magnet gear reduction design, the 18-6275-1 is lighter and more compact than older style direct drive starters while still delivering strong cranking torque for reliable cold starts. It is built for inboard applications and is intended to replace worn or failed OEM starters carrying part numbers 3857747 or 3860566. Buyers replacing a tired starter on a late model GM inboard with a 14 inch flywheel can install this unit without modifying the existing mounting points, provided the flywheel size and bolt pattern match.
Specifications
- Brand: Sierra
- Manufacturer Part Number: 18-6275-1
- Type: Starter Motor
- Voltage: 12 Volts (DC)
- Wattage: 1.7 KW
- Standard: SAE J1171
- Flywheel Fitment: 14 inch
- Bolt Pattern: 2 Long Bolt Offset Pattern
- Application: Inboard
- Starter Type: Permanent Magnet Gear Reduction
- Material: Metal
- Item Dimensions: 11.7 x 7.7 x 6.6 inches
- Weight: 9.67 pounds
- OEM Cross Reference: 3857747, 3860566
Fitment
- Late model GM inboard engines with a 14 inch flywheel
Replaces (OEM)
- 3857747
- 3860566
Frequently Asked Questions
What engines does the Sierra 18-6275-1 starter fit? The Sierra 18-6275-1 is built for late model GM inboard engines with a 14 inch flywheel, using a 2 long bolt offset mounting pattern.
Is the 18-6275-1 a direct replacement for OEM part 3857747? Yes, the Sierra 18-6275-1 starter replaces OEM part numbers 3857747 and 3860566.
Does 18-6275-1 also replace part number 3860566? Yes, both 3857747 and 3860566 are listed as OEM replacements covered by the Sierra 18-6275-1 starter.
What voltage and wattage is this starter rated for? This starter runs on a 12 volt DC electrical system and is rated at 1.7 KW.
Is the 18-6275-1 safe for use near gasoline engines? It meets the SAE J1171 marine ignition protection standard, which covers safe operation around gasoline engine compartments.
What type of starter design does the 18-6275-1 use? It is a permanent magnet gear reduction starter, a lighter and more compact design than older direct drive starters while still providing strong cranking power.
How much does the 18-6275-1 starter weigh? The Sierra 18-6275-1 starter weighs 9.67 pounds.
What are the physical dimensions of this starter? The 18-6275-1 measures 11.7 x 7.7 x 6.6 inches.
What material is the 18-6275-1 starter housing made of? The housing and core components of the Sierra 18-6275-1 are made of metal.
What bolt pattern does the 18-6275-1 use for mounting? It uses a 2 long bolt offset mounting pattern, matching the original equipment mounting points on late model GM 14 inch flywheel inboard engines.
Is this starter intended for inboard or sterndrive use? The Sierra 18-6275-1 is designed for inboard engine applications.
Will the 18-6275-1 fit an engine with a different flywheel size? No, the 18-6275-1 is built specifically to match a 14 inch flywheel; a different flywheel size requires a different Sierra starter part number.