Cylinder Liner / Sleeve 5I-7523A for Caterpillar 3066 / C6.4 Engine (Replaces 5I-7523)
Aftermarket cylinder liner (cylinder sleeve), replacement for Caterpillar 5I-7523. Fits 3064 / 3066 / C4.2 / C6.4 engines on CAT 311-323 excavators and 910G loaders.
Compatible with: Caterpillar / 311, 312, 313D, 314C, 314D, 315D, 318C, 318D, 319C, 319D, 320, 320B, 320C, 320D, 910G · Engine: CAT 3064 / 3066 / C4.2 / C6.4 / S6KT
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Not sure which part fits? Send us a part number, your machine model, or a photo — we confirm the right one fast.
🔧 By part number for traders🚜 By machine model for workshops📷 By photo for site teams
OEM / Reference5I-75235I7523CA5I75235I-7523A
Available — Xi’an consolidation point
40+Machine brands covered
1,000+Part references
24hResponse time
100%Pre-shipment photo check
Find the right part in 3 ways
By Part Number
By Machine Model
By Photo
Best for traders — you already have the number
Best for workshops — you know the machine
Best for site teams — only a nameplate photo
Not sure which one to send? Just share whatever you have.
Why buyers trust us
Each concern answered with a specific action.
01
Same series, different machine — different part.
We confirm by part number, model and photos before shipment.
02
Waiting days for a price loses the deal.
Quotation and model confirmation within 24 hours.
03
Cheap parts fail and cause downtime.
Every unit checked; stable replacement-grade parts.
04
Photos online are often copied.
We send real inspection & packing photos before dispatch.
05
High minimums tie up cash.
Start small and scale up — mixed orders supported.
06
Damage or late delivery.
Proper packing; express, air, rail or sea with tracking.
07
The supplier disappears after payment.
One contact stays with you for installation and use.
08
Buying from China feels like a gamble.
Transparency and accountable English/Russian support.
Not sure which part you need?Use the finder to confirm by part number, model or photo.
Go to Part Finder →Specifications
| MOQ | 5 pcs |
| Type | Cylinder Liner / Sleeve |
| Engine | CAT 3064 / 3066 / C4.2 / C6.4 |
| Length | 139.7 mm (5.5 in) |
| Replaces | CAT 5I-7523 |
| Shipping | Rail / Sea / Air |
| Warranty | 12 Months |
| Application | Caterpillar engine |
| Sleeve Inside Diameter | 101.5 mm (3.996 in) |
Part numbers & replacement guide
| Part Number | Machine Model | Type | Availability |
|---|
| 5I-7523 | 311 / 312 / 313D | Replacement part | In Stock |
| 5I7523 | 311 / 312 / 313D | Replacement part | In Stock |
| CA5I7523 | 311 / 312 / 313D | Replacement part | In Stock |
| 5I-7523A | 311 / 312 / 313D | Replacement part | In Stock |
This is a partial reference. We support 1,000+ part numbers — send yours to confirm.
Fits these machines
311 312 313D 314C 314D 315D 318C 318D 319C 319D 320 320B 320C 320D 910G
Kit Includes
Cylinder liner (straight sleeve) - sold per piece; 6 pieces per engine for 3066
Common Fault Symptoms
Blue smoke or high oil consumption
Low compression, poor starting
Piston scuffing or scoring on the bore
Overheating history, out-of-round bore
Installation Tips
- 1. Clean the cylinder block bore; remove rust, burrs and carbon deposits.
- 2. Press the liner squarely with the correct driver; check seating depth.
- 3. If the liner is semi-finished, complete final boring and honing to the rebuild specification.
- 4. Check bore size, roundness, taper and piston-to-liner clearance before assembly.
Technical Data
| Material | Alloy Cast Iron |
| Dimensions | Sleeve ID 101.5 mm (3.996 in) | Length 139.7 mm (5.5 in) | Type: Finished (ready to install) |
| Package | Carton / Wooden Case |
| System | Engine System |
| Position | Internal |
| Tonnage | 13-20T |
| Process | Casting |
| Surface Treatment | Phosphating |
| Certification | ISO9001 |
| Warranty | 12 Months |
| Lead Time | 15-30 Days |
| MOQ | 5 pcs |
| Packaging | Carton, Wooden Case |
| Quantity per Unit | 6 |
Part Number Cross Reference
| Original (OEM) | 5I-7523 / 5I7523 / CA5I7523 / 5I-7523A |
| Brand No. | CA5I7523 |
| Cross Reference | 5I-7523 |
| Cross Reference | 5I7523 |
| Cross Reference | CA5I7523 |
What you're quietly worried about
We put it on the table and say exactly how we handle it.
| Concern | Impact | How we help |
|---|
| Wrong part model | Installation failure, extra cost | Confirmed by number, model and photos before shipment. |
| Unclear part number | Delays in sourcing | We identify the part from whatever info you have. |
| Poor quality | Downtime and complaints | Stable replacement elements; every unit checked. |
| Slow response | Project delays | Reply within 24 hours. |
| Many suppliers | Complex procurement, higher cost | Wide coverage, mixed orders from one source. |
| Shipping risk | Damage or late arrival | Export packing and the right shipping method. |
| High MOQ | Financial risk | Flexible quantity — start small. |
| No after-sales | Problems unresolved | We stay in touch after delivery. |
How we work
Every step — what you do, what we do.
01
Send your request
Send part number, machine model or photo — whatever you have.
02
Model confirmation
We confirm the correct part from your number, model and photos.
03
Quotation & details
You receive price, availability and specifications.
04
Order confirmation
We arrange preparation on the agreed terms.
05
Inspection & packing
We check the parts and send photos before dispatch.
06
Shipping & delivery
Express, air, rail or sea — with tracking after dispatch.
Frequently asked questions
What engine does 5I-7523A fit?
It is listed for Caterpillar 3064, 3066, C4.2 and C6.4 engine references and is commonly ordered for CAT 311-323 excavator repair. Final fitment is confirmed by the removed liner and its dimensions.
Is 5I-7523A the same as 5I-7523?
5I-7523A is our replacement for the original Caterpillar 5I-7523 liner. The original number is kept for cross-reference.
Finished or semi-finished sleeve?
Both supply types can be sourced. Tell us which one you need - semi-finished liners require final boring and honing after installation.
What should I send to confirm?
Photos of the old liner, the engine nameplate and your machine model, plus measurements of bore, outer diameter and total length.
Send an inquiry
Aftermarket cylinder liner (cylinder sleeve) 5I-7523A - a direct replacement for the Caterpillar 5I-7523 liner. It is fitted when the old sleeve shows bore wear, scoring, out-of-round or piston scuffing; typical symptoms are blue smoke, high oil consumption, low compression and poor starting.
Manufactured from centrifugally cast alloy iron with a controlled honing pattern for stable ring sealing. Supplied as a straight sleeve - confirm whether you need a finished or semi-finished liner before ordering, because final boring and honing may be required after pressing.
Before shipment we confirm the engine reference (3064 / 3066 / C4.2 / C6.4), the removed liner number and the key dimensions - bore, outer diameter, total length and wall thickness - and send inspection photos.
- Direct replacement for CAT 5I-7523 / 5I7523 / CA5I7523
- Fits 3064 / 3066 / C4.2 / C6.4 / S6KT engine families
- Centrifugally cast alloy iron with a controlled honing pattern
- Confirmed by old liner photos, engine nameplate and dimensions before shipment
- Inspection and packing photos before dispatch
