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PK-UM25 Universal M-25XP Marine Serpentine Pulley Kit

Price Was: $479 - Now $407

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PK-UM25 Universal M-25XP Marine Serpentine Pulley Kit


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  • Now you are able to run a high output marine alternator
  • eliminate belt dust
  • Save fuel
  • Reduce engine noise
  • Increase the life of your engine
  • Add a second crank pulley and run other devices
  • Greatly extend your cruising time and distance

Product Description

This Perkins M30 Marine Serpentine Pulley Upgrade Kit is very easy to install. Allow approx. 1 hour and 5 minutes the first time you do this simple installation. When purchasing any Electromaax marine alternator the pulley can be installed for you at the factory. The new 10 groove serpentine (micro ‘V’) crank pulley simply slips over your current crankshaft pulley and is secured with the bolts supplied. The new serpentine waterpump pulley simply replaces your original. When replacing the original Hitachi alternator with your new Electromaax Marine alternator the installation has been eased by utilizing the factory Yanmar connections making this upgrade “plug and play”.

Helpful install hints

1. When loosening the 4 water pump bolts leave the existing belt in place THEN undo the bolts. This way you can use the belt to stop the W/P pulley spinning. 2. Check the threads in the existing crankshaft pulley have not rusted. We find in most cases a little grease on our bolts clean the threads out if you carefully put them in half a turn and back. Alternatively you can use the correct thread chase (typically metric). This popular Yanmar Marine engine, and all other engines operate much smoother, quieter and virtually eliminate belt dust with a serpentine upgrade kit. Additional benefit of an Electromaax kit is the ability to drive auxiliary devices ie: Seafrost refrigeration, engine driven water maker, second alternator, compressor… with the addition of a second crankshaft pulley. Contact us for further details You can now safely operate the Electromaax SM-12-80, 100 or 120 amp marine alternators that produce up to 70% of their output at fast idle.

Additional Information

Weight 1.5 lbs
Dimensions 8 × 8 × 3 in