Description

Dynapac (china) Compaction & Paving Equipment Alfa Romeo, Audi, BMW, Mini, Brilliance 2012 Parts Catalog

You’ve got a dead alternator because the bearing in the OAP (overrunning alternator pulley) gave out. Or maybe you’re staring at a seized pulley on a BMW N47 and the parts counter gave you three different numbers. Stop. This 2012 catalog from Dynapac (china) Compaction & Paving Equipment is the exact factory document that shops use to cross-reference OAP part numbers for Alfa Romeo, Audi, BMW, Mini, and Brilliance — plus 40+ other makes. I’ve used these catalogs on the bench for years. They don’t print generic cross-listings; these are the actual INA factory numbers with OE references. Dynapac (china) Compaction & Paving Equipment Alfa Romeo, Audi, BMW, Mini, Brilliance 2012 Parts Catalog is 188 pages of data you can trust because it came from the people who invented the OAP in the first place.

What Makes This Catalog Different from a Generic Parts List?

Generic online lists lump together aftermarket junk and hope you don’t return it. This catalog breaks down OAP and OAD (overrunning alternator decoupler) part numbers by manufacturer, engine, and year. It includes the special tool required for removal and installation — page 4 shows the OAP tool. Page 8 shows you exactly how to read the catalog structure. There’s even a functional test procedure on page 182 that tells you whether the pulley is actually bad or you’re chasing a charging system issue. That’s what I call a real manual.

Get the Right Pulley Part Number — Period

You don’t need guesswork. Each section — Alfa Romeo starts on page 15, Audi on page 16, BMW on page 25, Mini on page 64, Brilliance on page 28 — lists the engine code, displacement, year range, and the correct OEM OAP or OAP-KIT part number. If you’re swapping an alternator on a 2011 Audi A4 2.0 TFSI, you flip to page 16, match the engine code CAEA, and see the part number. No fishing through three different eBay listings. The catalog also contains ALT (standard alternator pulley) OE references on page 133 and OAP OE references on page 145, so you can verify against the original VW, BMW, or Fiat part numbers.

Special Tool for OAP: Why You Need It

Page 4 shows the special tool for OAP — a specific socket that engages the internal splines of the overrunning pulley without damaging the rotor. I’ve seen guys use a strap wrench and ruin the pulley bore. Then they blame the part. The catalog tells you which tool number fits which pulley series. Don’t skip it. If you don’t have the right tool, you’ll spin the rotor shaft and that’s a new alternator job. The “Concealed technology in OAP/OAD” section (page 12) explains the internal mechanism so you understand why the tool matters.

Using the Cross-Reference Tables Correctly

The numerical list starts on page 129. That’s your cheat sheet when you only have the INA part number from the old pulley. You look up the number, get the exact cross-reference to OE numbers like 5WK8337 or 01 29 077. Then check the OAP cross-reference table (page 153) to confirm it matches your application. Don’t skip the ALT cross-reference on page 149 either — sometimes a standard pulley was superseded by an OAP and you need the updated part.

One thing that bugs me: aftermarket catalog sites strip out the warnings. This catalog includes a “Signs of damage” photo section (page 180) with real photos of failed pulleys — cracked bearings, grease leakage, and spline wear. That alone saves you from installing a new pulley on a bad alternator shaft.

Signs of Damage and Functional Test

Page 180 shows six common failure modes with photographs. Page 182 gives you a functional test procedure: spin the pulley by hand in the overrun direction, feel for drag, listen for grinding. If you’ve got a car that chirps on deceleration, this test confirms if the OAP is bad. I’ve used this test on a BMW E90 with the N52 engine — took five minutes, saved the customer from buying a new alternator. The dimensions table on page 186 lists outside diameter, length, and internal spline type for every pulley in the catalog. That’s the final check before you order.

For related documentation, check the INA Belt Drive Components Catalog 2010/2011 if you need belt routing and tensioner info. If you’re working on a compactor or paving machine, the Dynapac F800T 2015 Spare Parts List covers the heavy equipment side. For older fastener torques, the Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide is a solid reference.

FAQ

Does this catalog include torque specs for the pulley nut?

No. This is a parts catalog, not a repair manual. It lists the part numbers and dimensions only.

How do I verify that the OAP part number fits my specific vehicle?

Use the numerical list on page 129 to find the INA part number, then cross it with the OE reference tables starting on page 133. Match the engine code and year from the manufacturer sections (e.g., Alfa Romeo page 15). If the OE number matches your original alternator pulley, you’re good. If you have the old pulley with an INA stamp, the OAP cross-reference on page 153 will confirm it. For dimensions, compare against the table on page 186 — outside diameter, shaft length, and spline count must match. If you’re still unsure, call the parts supplier with the OE number. Always double-check before spending money on a pulley that won’t fit. I’ve seen a Mini Cooper OAP swapped into an Audi and it locked up the belt drive within 200 miles.

Factory part catalogs like this one keep your bench work accurate. You don’t order blind, you don’t trust online cross-reference databases, and you don’t waste time returning wrong parts. Access the Factory Manual now and keep it on your tablet or printed out for the next OAP job.