Alternator Mounting Guide

The following guide provides a basic reference for matching High-Output Balmar alternators to your specific engine type. Keep in mind that "real world" factors, including engine age, engine model, engine marinizer, distributor and/or installer, can all have a dramatic effect on the actual mounting configuration you'll find on your specific engine.

In addition to your alternator's mounting style, it is essential to ensure that your alternator's amperage capacity is matched to the size of your drive belt. If your engine uses a 3/8" drive belt, we recommend our 75-amp alternator. If your existing drive belt measures 1/2", we recommend our 100-amp alternator. If your engine is equipped with a dual 1/2"-belt system, our 150-amp alternator would be the recommended choice for your system. Large case, high-output alternators should be driven by a minimum of two 1/2" belts.

We strongly recommend you examine your engine to determine both mounting style and drive belt size before you order a replacement or upgrade alternator.

*Remove original pulley and mount on BALMAR ® alternator; or move U bracket forward
**Yanmar Mounting: 35 amp uses 6 mm Mt. bolt, 55 amp 8 mm Mt. bolt, 80 amp special 10 mm bushing.  

Bukh 91 series 1" M.F.
Caterpillar Not Standard, usually isolated ground, 91

 or large case

Varies by model
Chrysler 90 series with spacers Varies by model
Crusader 91 series 1” M.F.
Cummins 92/94 TCU series( dual foot), 95

 series or 912 series

Varies by model
Delco 55 Alt. (W/2” M.F.) 912 series 2” (Delco style) M.F

. (or 91 w/ 1” M.F. & 1” spacer)

2” M.F.
Detroit Diesel 92/94 series (specify dual foot), some 912 series Varies by model
Flagship 91 series 1” M.F.
GMC 91 series for most (can use 92/94 series ) Varies by model
Greymarine 91 series 1” M.F.
Hawk Marine Power 91 series 1” M.F.
Hitachi Alternator 90 series (dual foot 3.15” separation)
Indmar 91 series 1” M.F.
Isuzu 91 series 1” M.F., drill hole to 1/2”
John Deere 91 series 1” M.F.
Lehman(Ford) 91 series 1” M.F. Call American Diesel
Lehman(Sabre) 901-75 or 901-100 series (dual foot 3.15” separation)
Lugger 6125 Lugger mounting kit for the 6125 465 hp engine  
Lucas Alt. 901-75 or 901-100 series (all isolated ground) (dual foot 3.15” separation)
Mann No standard. (Can use 92/94 series )  
Mercedes 90 series (dual foot 3.15” separation), with spacers common
Mercrusier 91 series 1” M.F.
Mitsubishi 90 series case (dual foot 3.15” separation) 1” spacer 3/8 bolt
Motorola Alternator 91 series 1” M.F.
MTU No standard (Can use 92/94 series )  
Namni 90 series (dual foot 3.15” separation)
Nippondenso Alt. 90 series (dual foot 3.15” separation), Modify engine mount.
OMC 91 series 1” M.F.
Pathfinder* 912 series 2” (Delco style) M.F.
Perkins 4-107,108 912 series 2” (Delco style) M.F
Perkins (other) 91 series 1” M.F.
Perkins-Volvo M series 901-75 or 901-100 series (dual foot 3.15” separation), isolated grounds
Pleasurecraft 91 series 1” M.F.
Prestolite Alt. 91 series 1” M.F.
Universal Atomic 4 91 series or 912 series 1” M.F. with 1” spacer
Universal 30, 50 -1982 91 series 1” M.F.
Vetus-Denouden 90 series (dual foot 3.15” separation)
Volvo - 2001 -2003 912 series 2” ( Delco style) M.F. (turbo - swing arm mod.)
Volvo - Driven off Flywheel Alternator must have a special 3/8” x 4” pulley  
Westerbeke 46 4107, 4108 (1979) 91series 1” M.F.
Westerbeke 46 (1986) 90 series (dual foot 3.15” separation)
Yamaha (IO) 91 series 1” M.F.
Yanmar ** 90 series (dual foot 3.15” separation)