AltMountPatentAltMount®Serpentine Pulley Conversion Kits
Balmar’s Patented AltMount® Serpentine Pulley Kits Facilitate the use of Balmar High Power Alternators

  • Better Power Transfer
  • Reduced Vibration and Belt Dust
  • Quieter Motoring

Single Vee pulleys can only support alternator power loads (PTO) of up to 100A for 12V applications (45A for 24V applications). A serpentine pulley provides greater surface contact between the belt and pulley, and thus can accommodate much higher PTO requirements.

AltMount® Pulley Kits are designed uniquely for each engine listed below, including all the hardware required to complete the installation. The system is installed by placing and fastening a conversion pulley over the existing crank pulley and replacing the water pump pulley. Two serpentine belts are provided with each kit. 

AltMount® Pulley Kits are designed to be used with Balmar 6-Series, XT-Series and AT-Series Alternators.  We cannot guarantee fit with other brands of alternators.   For 95-Series Alternators, use the 48-AM-39 alternator pulley. For 7-Series Alternators, use the 48-AM-102 alternator pulley.  For Hitachi Alternators, use the 48-AM-97 alternator pulley.

AltMount® Pulley Kits install easily and deliver a marked improvement in power transfer while reducing noise and engine vibration.   View the installation video below to see how easy it is to install an AltMount® Pulley Kit, then select a kit for your engine from list!

Specify an AltMount® Pulley Kit for your needs from the drop-down lists below.
AltMount® Pulley Kits are designed and produced specifically to fit each engine listed.

Yanmar Serpentine Pulley Kits

Identify Your Engine Model on the Left Column to find the Appropriate AltMount® Kit on the Right,
Then Click on the Kit Number to view a Kit Picture and Additional Information:

 Yanmar Engine Model AltMount® Kit Number
2GM2048-YSP-3GM-C
2GM20-F48-YSP-3GM-B
2YM1548-YSP-3YM-A
3GM48-YSP-3GM-C
3GM3048-YSP-3GM-A
3GM30-F, 3GM-F48-YSP-3GM-B
3HM, 3HM3548-YSP-3HM-A
3HM35-F, 3HM-F48-YSP-3HM-B
3JH2-E, 3JH2-TE48-YSP-3JH-C
3JH348-YSP-3JH-E
3JH4-E, 3JH548-YSP-3JH-A
3YM2048-YSP-3YM-A
3YM3048-YSP-3YM-B
4JHE,-TE,-HTE,-DTE, 4JH48-YSP-4JH-F
4JH2,-TE,-HTE,-DTE,-UTE48-YSP-4JH-E
4JH3, -TE, -HTE48-YSP-4JH-D
4JH4-HTE,-TE,-DTE48-YSP-4JH-B
4JH4-E, 4JH5, 4JH5-E48-YSP-3JH-A
4LH-A48-YSP-4LH-A
6LY, 6LYA-STP, 6LY2-STP48-YSP-6LY-A

Volvo Penta Serpentine Pulley Kits

Identify Your Engine Model on the Left Column to find the Appropriate AltMount® Kit on the Right,
Then Click on the Kit Number to view a Kit Picture and Additional Information:

 Volvo Penta Engine Model AltMount® Kit Number
2001, 2002, 2003(T) (3 Pulleys) 48-VSP-2001 
2001, 2002, 2003(T) (2 Pulleys)48-VSP-2001R
D2-55A, B, C, D, E, F48-VSP-D2-A
MD203048-VSP-MD-A
MD204048-VSP-MD-B
PRIMA, TMD-2248-VSP-PR-A

Westerbeke Serpentine Pulley Kits

Identify Your Engine Model on the Left Column to find the Appropriate AltMount® Kit on the Right,
Then Click on the Kit Number to view a Kit Picture and Additional Information:

Westerbeke Engine Number AltMount® Kit Number 
12C, 12D48-WSP-12C
13A48-WSP-21
1848-WSP-18
20B48-WSP-12C
2148-WSP-21
21A48-WSP-18
2748-WSP-21
27A48-WSP-18
30B48-WSP-12C
30C, 3348-WSP-33
35B, 38B48-WSP-18
4048-WSP-40
42B48-WSP-18
44A, 44B, 44C48-WSP-44A
4648-WSP-46
71, 8248-WSP-71

Universal Serpentine Pulley Kits

Identify Your Engine Model on the Left Column to find the Appropriate AltMount® Kit on the Right,
Then Click on the Kit Number to view a Kit Picture and Additional Information:

 Universal Engine Number AltMount® Kit Number 
M25, M25XP48-USP-M25
M25XPB48-USP-M35B
M3548-USP-M-B
M35B, M40B48-USP-M35B
M50, M50A, M50B, 544448-USP-M50
543248-USP-5432

Perkins/Sabre Serpentine Pulley Kits

Identify Your Engine Model on the Left Column to find the Appropriate AltMount® Kit on the Right,
Then Click on the Kit Number to view a Kit Picture and Additional Information:

 Perkins/Sabre Engine Model AltMount® Kit Number 
4107, 410848-PSP-410-A
6.35448-PSP-6354
PERAMA, M20, M25, M3048-VSP-MD-A
PRIMA, M50, M60, M8048-PSP-PR-A

Nanni Diesel Serpentine Pulley Kits

Identify Your Engine Model on the Left Column to find the Appropriate AltMount® Kit on the Right,
Then Click on the Kit Number to view a Kit Picture and Additional Information:

 Nanni Diesel Engine ModelAltMount® Kit Number 
N3.30, N4.3848-NSP-3.3
N4.4, N4.5, N4.648-NSP-4.6
N4.85, N10048-NSP-100

Ford/Lehman Serpentine Pulley Kits

Identify Your Engine Model on the Left Column to find the Appropriate AltMount® Kit on the Right,
Then Click on the Kit Number to view a Kit Picture and Additional Information:

 AltMount® Kit Number Ford/Lehman Engine Model
FL80, FL12048-FSP-100

Vetus Serpentine Pulley Kits

Identify Your Engine Model on the Left Column to find the Appropriate AltMount® Kit on the Right,
Then Click on the Kit Number to view a Kit Picture and Additional Information:

 AltMount® Kit Number    Vetus Engine Model
M4.15, M4.17, M4.5548-VSP-M4.17

New AltMount® Pulley Kits are constantly under development.
If you do not see a kit for your engine, contact us or call our Technical Support line at 1.360.435.6100 x3.

 

Second Alternator KitAltMount® Second Alternator Kits provide the ability to add a high-output second alternator for increased charging output from a single engine. These kits are an ideal upgrade for serious cruisers and others who depend on the propulsion engine for fault tolerance or substantial battery charging needs.
(For use on Yanmar engines with 95-Series Alternators only).

Yanmar Second Alternator Serpentine Pulley Kits

Identify Your Engine Model on the Right Column to find the Appropriate AltMount® Kit on the Left, Then Click on the Kit Number to view a Kit Picture and Additional Information:

 AltMount® Kit Number Yanmar Engine Model
48-YDA-4JH-A4JH3
48-YDA-4JH-B4JH4-HTE, -TE
48-YDA-4JH-C4JH4-E
48-YDA-6LY-A6LY, 6LY-2