Perkins KRP3122 Main Bearing Kit for 2306, 2506 & 2806 Engines

KRP3122 is a Perkins main bearing kit used on selected 2306, 2506 and 2806 series diesel engines. It is normally purchased when the engine is being overhauled or when inspection shows that the crankshaft main bearings need replacement.
For a running generator set or heavy-duty diesel engine, the important question is not simply whether the part number is listed for the engine family. The correct bearing should be confirmed against the engine model, Build List, ESN and bearing size required after crankshaft inspection. This helps avoid ordering the wrong bearing set and having to stop the overhaul while waiting for replacement parts.List of compatible engine models

KRP3122 is associated with several Perkins 2306, 2506 and 2806 engine series.
Because the same engine family can have different builds and production configurations, do not confirm compatibility by engine family alone.

KRP3122 is commonly listed as a STD (standard-size) main bearing kit. However, STD should not automatically be ordered simply because the engine model matches. During an engine overhaul, the crankshaft journals should be inspected and measured before the final bearing size is selected. If the crankshaft has already been ground, or if the main journals are outside the standard specification, a repair-size bearing may be required instead.

Before ordering, send us the engine nameplate, existing main bearing part number, crankshaft journal condition and required bearing size

Some Perkins parts references and supplier catalogues identify KRP3122 as a replacement/superseding number for KRP3116. At the same time, KRP3116 also appears in references for repair-size main bearings, such as 0.25 mm(KRP3116/025) and 0.50 mm(KRP3116/050) applications.

Therefore, do not select KRP3122 or a KRP3116 repair-size bearing based only on the old number. If your existing engine documentation shows KRP3116, send us:
The old part number, engine nameplate, required bearing size, if known
We can check which current part number and size should be quoted for your engine.

More Main Bearing in stock as below

ZEB Power offers main bearing 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 main 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

KRP3122 for Perkins Engine Overhaul

Main bearings are normally only one part of a major Perkins engine overhaul. When the crankshaft and lower engine are being inspected, buyers may also need to consider:

Big end bearing kit, Thrust washers, Piston and ring kit, Cylinder liners, Complete gasket set, Connecting rod components, Oil pump, Water pump, Front and rear crankshaft seals and other overhaul components according to engine condition

For this reason, we recommend checking the complete overhaul requirement before placing the order rather than purchasing individual parts only after the engine has already been dismantled.

Perkins Engine Overhaul Parts
Perkins 2306/2806 Big End Bearing Kit KRP3012
Perkins 2206 Main Bearing Kit KRP3120

KRP3122 Main Bearing Kit for Generator Sets

KRP3122 is also encountered in Perkins-powered generator set maintenance and overhaul. For a standby or prime-power generator, the bearing itself is only one part of the procurement risk.
The bigger problem is often ordering a bearing kit that looks correct by part number but does not match the actual engine configuration or required repair size.
For generator set maintenance, we recommend providing:

Generator Set → Engine Nameplate → Required Parts

This gives us a better basis for checking the correct Perkins part number and quantity before quotation.

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 KRP3122?

KRP3122 is a Perkins main bearing kit used on selected 2306, 2506 and 2806 series diesel engine configurations. It is commonly required for engine overhaul and main bearing replacement.

Q2: Is KRP3122 a standard-size main bearing?

KRP3122 is commonly listed as a STD main bearing kit. However, the required bearing size should be confirmed from the actual engine and crankshaft condition before ordering.

Q3: Does KRP3122 fit all Perkins 2306, 2506 and 2806 engines?

Not necessarily. These engine families include different configurations and Build Lists. We recommend confirming the engine nameplate before ordering.

Q4: Is KRP3122 the replacement for KRP3116?

Some parts references identify KRP3122 as a replacement or superseding number for KRP3116. However, KRP3116 is also used in references for repair-size bearings, so the old part number alone should not be used to determine the correct replacement.

Q5: How many pairs are included in a KRP3122 kit?

Some Perkins generator-set procurement specifications identify KRP3122 as a 7-pair main bearing kit. The exact package quantity should be confirmed for the specific application before ordering.

Q6: Can you check KRP3122 from an engine nameplate?

Yes. Send us a clear photo of the engine nameplate. We can use the engine model, ESN and Build List to check the required part number before quotation.

Q7: Can I order KRP3122 together with other overhaul parts?

Yes. If you have a complete overhaul list, send it to us. We can check the main bearings, big end bearings, thrust washers, liners, piston kits, gasket sets and other required parts together.

Q8: What information should I send for a KRP3122 quotation?

Ideally, send the engine nameplate with your required quantity and any existing parts list.

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.

ZEB Power — Diesel Engine Parts & Generator Set Solutions Since 2008

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