How to Read Baudouin Part Numbers: Formats, Engine Series & Ordering Guide

A customer emails you a photo of an engine nameplate and a list of numbers. One number has twelve digits, the next has ten, and a third starts with a letter followed by a dot. All three came off the same Baudouin-powered generator set.

Quote the wrong one and the wrong part ships. The engine stays down, the customer blames you, and the margin on that order disappears in return freight.

This guide decodes every Baudouin part number format you will meet in the field, with real OE examples from the 6M11 up to the 12M26, so you can identify, verify and order the right part the first time.

What does a Baudouin part number look like?

A Baudouin part number is a numeric string, usually 8, 10 or 12 digits long, with no brand prefix and no dashes. That is the short answer. The longer answer: Baudouin runs several numbering families in parallel, and the digit count plus the leading digits tell you which family you are looking at.

The volume alone justifies learning the pattern. Across the eight factory parts catalogues that cover the Baudouin M-series range, from the 6M11 to the 12M26, there are 583 assembly groups and more than 4,100 individual line items. The 12M26 catalogue by itself lists 694 line items across 76 assembly groups. At that scale, one transposed digit points to a completely different component.

Count the digits. That single check sorts most of what lands in your inbox.

How are Baudouin part numbers structured?

Think of a Baudouin part number as an address rather than a name. The leading digits are the street — they point to a platform or a system — and the remaining digits narrow it down to the exact part. You do not need to memorize the internal logic. You only need to recognize the neighborhoods.

Baudouin is part of the Weichai Group, and the numbering shows it. Platform-shared sensors on the 12M26 carry the same 6126-prefix format found across Weichai WP-series engines — the pressure sensor 612600090760 is one example. A number in that family may legitimately fit several engines; a 331-prefix part usually fits one.

For genset spare buyers, two families do most of the work: the 10-digit 1000-series and the 33x 12-digit series. Learn those two first, then add the rest as you meet them.

Which Baudouin part numbers come up most often by engine series?

The table below pulls real OE numbers from factory parts catalogues for the series you are most likely to service, from the 6M11 inline-six up to the 31.8 L (1,941 cu in) 12M26. Quantities are per engine, straight from the catalogues.

All numbers above are OE references taken from factory parts catalogues. Verify fitment against your exact engine model and serial number before ordering.

Notice what the table shows. The same component — a cylinder head gasket — carries a different Baudouin part number on every series. 330201000501 fits the 6M33, 612600040646 fits the 6M16, 1004329208 fits the 6M21. There is no universal gasket, and there is no universal number.

Same part name. Different number. Different engine.

How do you find the right Baudouin part number from your engine nameplate?

The model code on the nameplate is a compressed spec sheet. Once you can read it, finding the right Baudouin part number becomes a lookup exercise instead of a guessing game.

The code breaks down like this. The leading number is the cylinder count. The letter M marks the M-series. The two digits after M encode the per-cylinder displacement in units of 0.1 L — so a 6M33 is six cylinders of about 3.3 L each, roughly 19.8 L (1,208 cu in) in total, and a 12M26 is twelve cylinders of 2.65 L, roughly 31.8 L (1,941 cu in). A G suffix marks a spark-ignited gas engine; B0 marks a biogas configuration. Trailing codes such as D2, D3 and D5 indicate EU Stage II, Stage IIIA or Stage V emission levels, and /5 or /6 marks a 50 Hz or 60 Hz genset rating.

The duty rating on the same plate matters for parts planning. COP means continuous power with no overload allowance. PRP is prime power with a 10% overload available one hour in twelve. ESP is emergency standby, typically limited to about 200 running hours per year, and LTP is limited-time prime at up to 500 hours per year. Duty decides how fast wear-part numbers turn over in your stock: a COP-rated 12M33NG in a biogas plant running 6,000 or more hours a year consumes spark plugs and filters at roughly thirty times the rate of an ESP standby set.

From nameplate to order, the process has six steps:

1. Photograph the nameplate — model, serial number and rating.
2. Decode the model into engine series and fuel type.
3. Pull the parts catalogue for that exact series and emission stage.
4. Find the assembly group for the system you are working on.
5. Confirm the OE number, the quantity per engine and any variant notes.
6. Send the OE number, engine model and quantity to your supplier for cross-reference.

Read the nameplate first. Everything else follows.

What mistakes do buyers make with Baudouin part numbers?

Quoting the catalogue cover number. DHM33D0057 identifies the 6M33 parts catalogue as a document. It appears on the cover and in file names, and it will never return a part. The same applies to DHP-prefixed codes on Weichai-platform catalogues.

Treating a dotted X-number as a full OE number. References like X6231.150W are borrowed or generic hardware entries inside a catalogue. They are fine for a sensor seat or a clamp, but they do not behave like a Baudouin part number when you search or quote them.

Ordering by description. The word "gasket" appears dozens of times in a single catalogue, attached to different numbers and different positions. A description without a number is a guess.

Mixing platform-shared and series-specific numbers. A 6126-prefix sensor may fit several engines across the Weichai platform. A 331-prefix bearing shell fits one engine family. Treating them the same way is how wrong parts get ordered.

Ignoring supersession. Newer engines increasingly carry 10-digit numbers where older documentation shows 12-digit ones. If your paperwork and the quote arrive in different formats, ask whether a supersession is on record — and get the answer in writing.

Frequently asked questions about Baudouin part numbers

Have a number you cannot place? Send it over. Contact Hanchi Auto Parts with your OEM number, engine model and quantity — cross-referencing is free and takes about 30 seconds on your side.

The bottom line on Baudouin part numbers

Baudouin part numbers look chaotic until you sort them by family. Eight, ten or twelve digits. The 1000-series for current parts, 33x for M26/M33 castings, 6126 for Weichai platform-shared components, 130 for gas and electronic parts. Learn those five patterns and most lists become readable at a glance.

The rest is discipline: decode the model, confirm the OE number, and never quote from a description alone. Do that, and Baudouin part numbers stop being a source of wrong orders.

Parts referenced in this article are compatible with Baudouin and Weichai engines; Hanchi Auto Parts is not affiliated with or endorsed by the OEM. All OE numbers are listed for fitment reference only.