Ingersoll Rand literature · Product information
Ingersoll Rand Series 150BMP Air Starters with Overhung Pinion: Product Information and Model Selection
An Ingersoll Rand introduction to the 150BMP air starter line fitted with an overhung drive pinion, aimed at diesel and carbureted engines worldwide. It explains how the new drive housing and starter drive differ from earlier 150BMP starters, describes flange and cradle mounting, and gives weights, port sizes, the model designation key and the orderable models with their communication numbers.
Document at a Glance
- Publisher
- Ingersoll Rand
- Document type
- Product information
- Form / number
- Form E6525, No. 03530743, Edition 1, 1979
- Language
- English
- Pages
- 8
- File
- PDF, 452 KB
What's in This Document
| Section | Pages | What it covers |
|---|---|---|
| Introduction | 1 | Positions the overhung-pinion 150BMP as an existing motor and gearing combined with a new drive housing and starter drive. |
| Features and benefits | 1 | Covers proven performance, a choice of flange or cradle mounting, a pre-engaged pinion and the wider engine coverage of the overhung design. |
| Construction | 1-2 | Describes the outboard pinion shaft on two widely spaced ball bearings, the drive housing seal, and the flange and cradle drive housing styles. |
| Specifications | 2 | Lists starter weights by mounting type, inlet and exhaust pipe tap and recommended hose size. |
| Performance curves | 3 | Torque and speed charts for the B (2.28:1) and C (2.69:1) gear ratios. |
| Model designation | 4 | Explains each position of the model code: gear ratio, mounting, rotation and pinion. |
| Pinion data and how to order | 5 | Pinion part numbers and the orderable starter models with communication numbers, plus optional equipment. |
Key Specifications and Data
| Item | Value | Page |
|---|---|---|
| Diesel engine range | 500 to 900 cu in | 1 |
| Carbureted engine range | 1000 to 1800 cu in (16.38 to 29.50 L) | 1 |
| Gear ratio B | 2.28:1 | 4 |
| Gear ratio C | 2.69:1 | 4 |
| Inlet and exhaust pipe tap | 1-1/4 in NPT | 2 |
| Recommended hose size | 1-1/4 in (32 mm) | 2 |
| Cradle mounting adapters | Adapt a 150 mm mounting diameter drive housing to 178 mm | 2 |
| Power medium | Air; not approved for natural gas or other combustible gas | 4 |
Model designation key (example 150BMP A B 03 R 85)
| Position | Code | Meaning |
|---|---|---|
| Basic model | 150BMP | Series 150BMP starter |
| Power | A | Air-operated |
| Gear ratio | B | 2.28:1 |
| Gear ratio | C | 2.69:1 |
| Mounting | 01 | SAE No. 1 flange |
| Mounting | 03 | SAE No. 3 flange |
| Mounting | 07 | 150 mm cradle with 89 mm pilot |
| Mounting | 08 | 178 mm cradle |
| Mounting | 17 | 150 mm cradle with 56 mm pilot |
| Rotation facing pinion | R | Right-hand |
| Rotation facing pinion | L | Left-hand |
| Pinion | 85, 83, 77 | See pinion data table |
Orderable models with communication numbers (cleanly printed rows only)
| Model | Communication number |
|---|---|
| 150BMPAB03R77 | 01191261 |
| 150BMPAB07R77 | 01189513 |
| 150BMPAC03R77 | 01189307 |
| 150BMPAC03R85 | 01189562 |
| 150BMPAC03R83 | 01191279 |
| 150BMPAC17R83 | 01190289 |
Models Covered
Model codes as printed in the document. Linked codes go to the matching Ingersoll Rand starter in our catalog.
150BMPAB03R77 150BMPAB07R77 150BMPAC03R77 150BMPAC03R85 150BMPAC03R83 150BMPAC17R83
Service Kits and Part Numbers
| Part number | Description | Page |
|---|---|---|
| SRV125 | Starter relay valve (optional equipment) | 5 |
Confirm part numbers against the serial and model plate of your starter. For any part not listed in our catalog, send us the number.
Frequently Asked Questions
What engines is the 150BMP overhung pinion starter for?
Diesel engines of roughly 500 to 900 cu in and carbureted engines of roughly 1000 to 1800 cu in, including many engines built outside the U.S.
What is the difference between 150BMP B and C ratio starters?
B gearing is 2.28:1 and favors higher cranking speed; C gearing is 2.69:1. The document says B gearing was brought back for engines where speed matters more than breakaway torque.
How is a cradle-mounted 150BMP starter held in place?
Two steel straps clamp it in a cradle, and alignment comes from two machined diameters on the drive housing plus a pilot that enters the flywheel housing.
How much does a 150BMP overhung pinion starter weigh?
From 43-3/4 lb (19.8 kg) for SAE No. 1 flange models up to 51 lb (23.1 kg) for the 178 mm cradle model.
Can the 150BMP overhung pinion starter run on natural gas?
No. The model key notes these starters are not approved for natural gas or other combustible gas as the power medium.
Need the parts or the starter in this document? Send the model number from your starter's plate and we will confirm the right Ingersoll Rand part or replacement.
Source: Ingersoll Rand, Form E6525, No. 03530743, Edition 1, 1979. Summary and tables prepared by AirStartersDirect.com, an authorized Ingersoll Rand air starter distributor; the PDF is the authoritative version. Page numbers refer to the PDF file. Reviewed October 2026.
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