Genuine Perkins 4006 Series Big End Bearing Kit SE91AA/3M for Engine Overhaul

The Perkins SE91AA/3M is a big end bearing kit used at the connecting rod big end and crankshaft crankpin interface. It is a critical component of the connecting rod assembly and is commonly replaced during engine overhaul or crankshaft repair.For Perkins 4006 engines, choosing the correct bearing specification is important because the required bearing size can depend on the actual crankshaft condition.The standard-size SE91AA/3M is used for the applicable standard crankshaft specification. If the crankshaft has previously been machined or reground, an undersize bearing such as SE91AA3M010 or SE91AA3M020 may be required.For this reason, we recommend confirming the engine information and crankshaft condition before placing an order.

List of compatible engine models

SE91AA/3M is documented as a big end bearing kit for Perkins 4006, 4008, 4012, 4016 engine series applications. The TAG series is used for power generation applications, including prime and standby power installations.Important: Engine model alone should not be treated as the final compatibility confirmation. Different engine configurations can exist within the same engine family.Please provide the Engine Serial Number (ESN) and Build List when requesting a quotation.

In addition, the SE91AA/3M family includes different bearing specifications for different crankshaft conditions.
SE91AA/3M, Standard Size (STD), Standard crankshaft specification
SE91AA3M010, 0.010" Undersize, Crankshaft machined/regrinded to the corresponding specification
SE91AA3M020, 0.020" Undersize, Crankshaft machined/regrinded to the corresponding specification

Do not select the bearing size only by engine model.If the crankshaft has been reground, the crankpin journal should be measured before ordering. Send us the crankpin measurement together with the engine ESN, and our team can help verify the appropriate bearing specification.

More Big End Bearing Kit in stock as below

ZEB Power offers connecting rod bearings for the Perkins 403, 404, 1103, 1104, 1106, 1204, 1306, 1506, 1706, 2206, 2506, 2806, 4006, 4008, 4012, and 4016 series, among others.
If you cannot find the connecting rod bearing you need in the list, please send us the engine nameplate or part number, and we will verify it for you.

Ensure Correct Perkins Bearing Kit Before Ordering

Selecting the wrong bearing kit may cause installation issues and unexpected downtime. Before quotation, our team verifies your engine information to ensure correct compatibility.

Verification includes:

✔ Engine serial number (ESN)
✔ Engine build list
✔ Existing part number (New number)
✔ Bearing specification

Perkins 4006 Engine Overhaul Application

The SE91AA/3M is particularly relevant to major maintenance and overhaul projects involving Perkins 4006 generator engines.
During an overhaul, the big end bearing may be inspected or replaced together with other components such as:

Main Bearing Kit, Piston and Ring Kit, Connecting Rod Components, Crankshaft, Camshaft Bushes, Gaskets, Oil Pump, Water Pump, Injectors

If you are sourcing a complete Perkins 4006 overhaul parts list, send us your parts list or engine information. We can check the part numbers and quantities together instead of quoting individual parts without confirming the engine configuration.

Procurement and Logistics

Genuine Perkins OEM parts supplied in partnership with an authorized Perkins first-tier distributor. Stock is sourced from Perkins warehouses in China, Singapore, and the United Kingdom, enabling competitive lead times across Africa, the South Amercia, Southeast Asia, and CIS markets. Original purchase invoices and certificates of authenticity available upon request.

Sourcing

· Genuine Perkins OEM · First-Tier Distributor Partner
· Warehouse locations: China · Singapore · United Kingdom

Lead Time

· Standard: 7–10 days from order confirmation
· Urgent orders: 3–5 days subject to warehouse stock availability
· Large volume orders: contact us to discuss dedicated stock arrangement

Trade Terms

· FOB · CIF · DDP · EXW
· Payment: T/T · L/C
· MOQ: 1 unit

Export Documentation

· Commercial Invoice · Packing List · Certificate of Origin
· Additional documentation requirements: notify us at time of inquiry

Warranty and After-Sales Service

Coverage

All parts carry a 12-month warranty from the date of shipment, covering manufacturing defects in materials and workmanship. Incorrect shipments (wrong part number or specification against confirmed order) are covered in full — replacement arranged at no additional cost with return freight covered by ZEB Power.

Exclusions

Warranty does not cover:
· Normal wear and tear under operating conditions
· Damage resulting from incorrect size selection or incompatible engine configuration
· Improper installation, including failure to observe Perkins specified torque values
· Use of non-recommended lubricants or contaminated oil
· Operation outside rated parameters

Claim Process

Contact us with ESN, Build List, installation date, and a description of the issue. Photo documentation of the failed part is required. Approved claims are fulfilled by replacement; return freight is covered by ZEB Power. Replacement is dispatched upon claim approval — typically within 5 working days of assessment.

Transit Damage Protocol

Inspect packaging upon receipt. If external packaging appears intact but internal damage is found upon unpacking, photograph both the packaging and the damaged part immediately and contact us within 48 hours of delivery (including weekends and public holidays). Cases of concealed transit damage are handled on a case-by-case basis — partial compensation or subsidized replacement will be arranged subject to photo evidence and carrier assessment.

FAQ

Q1. What is Perkins SE91AA/3M Big End Bearing Kit?

Perkins SE91AA/3M is a big end bearing kit, also known as a connecting rod bearing kit, for selected Perkins 4000 Series diesel engines. It is installed between the connecting rod big end and the crankshaft crankpin and is commonly replaced during engine overhaul or crankshaft repair.

Q2. Which Perkins engines use SE91AA/3M?

SE91AA/3M is used on selected Perkins 4000 Series applications, including Perkins 4006-23TAG2 and 4006-23TAG2A. It is also listed in Perkins parts information for other 4000 Series applications. Because different engine configurations may use different parts, we recommend confirming the engine model, Build List and ESN before ordering.

Q3. Is SE91AA/3M a standard-size or undersize bearing?

SE91AA/3M is the standard-size big end bearing kit. Perkins also lists undersize service options, including SE91AA3M010 (-0.010") and SE91AA3M020 (-0.020").

If the crankshaft has been machined or reground, an undersize bearing may be required. The correct size should be selected according to the actual crankpin journal measurement.

Q4. How do I know whether I need the standard or undersize SE91AA/3M?

Check the crankshaft crankpin journal after inspection or machining. If the crankshaft remains at the standard specification, SE91AA/3M may be required. If the crankshaft has been reground, an undersize bearing may be necessary. For accurate selection, send us the engine ESN, Build List and crankpin journal measurement. We can help verify the required bearing specification before quotation.

Q5. How many SE91AA/3M kits are required for a Perkins 4006 engine?

The required quantity depends on the specific engine application and parts configuration. For example, a National Power Corporation procurement specification for a Perkins 4006-23TAG2A lists 6 kits of SE91AA/3M. Please provide the engine model and Build List so the required quantity can be confirmed for your engine.

Q6. Can you supply SE91AA/3M for a Perkins engine overhaul?

Yes. SE91AA/3M can be supplied as part of a Perkins engine overhaul or bearing replacement project. If you need additional overhaul parts, send us your complete parts list. We can check the requested part numbers, quantities and engine compatibility together.

Q7. Can you help confirm the correct Perkins big end bearing before ordering?

Yes. Send us the part number, engine nameplate or ESN, and Build List if available. For engines that have undergone crankshaft grinding, please also provide the crankpin journal measurement. We can check the available bearing specification before you place the order.

Contact For Inquiry

To receive a quote, provide the following:
ESN (Engine Serial Number) · Part Number · Quantity required · Destination port and required documentation
Quote turnaround: within 24 hours.
Not sure of your Build List or crankpin condition? Send a photo of your engine nameplate and describe the symptoms — we will confirm the correct part and size for your engine.