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Balmar 48-USP-M25 Pulley Kit  for Universal  M25, M-A
Balmar Serpentine Pulley Kit

Balmar 48-USP-M25 Pulley Kit for Universal M25, M-A

On sale $495.00 $442.00
Available while stocks last only. As of end of March 2024 there were 19 left
p/n: 48-USP-M25
Availability: Out of stock at PKYS

Balmar Altmount Serpentine pulley kit permits mounting a much larger alternator in lieu of the standard model - for Universal Marine Diesel model M25, M-A

These Altmount Kits by Balmar offer the opportunity to install a larger alternator than would otherwise be possible. They are designed to fit select engine models, the list expands every day so if you don't see your engine listed do give us a call. Alternator upgrades using a single drive belt are limited by the amount of power that can be transferred by the belt but using a serpentine belt considerably increases the possibilities. The kits include a set of serpentine pulleys to go over the crankshaft and water pump pulley and replace the alternator pulleys and come with a matching serpentine belt. They are sold for specific engine models only. The alternators need to be purchased separately. If you order an alternator with a kit it will come with the appropriate pulley pre-installed. Installation is relatively easy. The kit comes with two belts but purchasing an additional spare belt is recommended as these are not typical serpentine belts.

Im sorry but the photos for these items are generic, I dont have exact photos of each kit or installation photos

Read my BLOG POST about installing one of these kits on a Yanmar.

Installation notes are on the blog post

My blog post has installation notes for this serpentine kit.


This kit is designed for use with a Balmar 6 series or XT series alternator.  It may be possible to use it with another alternator that has a 17mm shaft diameter, but the fit is not guaranteed.  If you choose to go that route you are on your own. 

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