Oil Pan Gasket 5I-7666A for Caterpillar 3066 / S6K / C6.4 Engine (Replaces 5I-7666)

Oil pan gasket (sump gasket), 1.4 mm thick, replacement for Caterpillar 5I-7666. Fits 3066 / S6K / C6.4 (3064 / C4.2) engines on CAT 318C / 319C / 320B / 320C / 320D / 323D.
Oil Pan Gasket 5I-7666A for Caterpillar 3066 / S6K / C6.4 Engine (Replaces 5I-7666)
Oil Pan Gasket 5I-7666A for Caterpillar 3066 / S6K / C6.4 Engine (Replaces 5I-7666)
Oil Pan Gasket 5I-7666A for Caterpillar 3066 / S6K / C6.4 Engine (Replaces 5I-7666)
AI Search Summary

Oil pan gasket for Caterpillar 3066 / S6K / C6.4 engines, replacement for CAT 5I-7666. 1.4 mm thick, fits CAT 318C / 319C / 320B / 320C / 320D / 323D.

Key Facts
MOQ10 pcs
Lead Time15-30 Days
Warranty12 Months
MaterialFibre / Composite Gasket
OEM / Reference
5I7666CA5I76665I-7666A5I-7666
Available — Xi’an consolidation point · reply within 24h
Compatible with: Caterpillar / 318C, 319C, 320B, 320C, 320D, 323D · Engine: CAT 3064 / 3066 / C4.2 / C6.4 / S6K / S6KT
40+Machine brands covered
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Overview

Fitment Note: Confirmed by the removed gasket number and the oil pan shape. 1.4 mm thick. Fit dry with the specified torque; a light sealant only at split lines.
Specifications
MOQ10 pcs
TypeOil Pan Gasket
EngineCAT 3066 / S6K / C6.4
MaterialFibre / Composite Gasket
PositionCylinder block / oil pan joint
ReplacesCAT 5I-7666
ShippingRail / Sea / Air
Warranty12 Months
Lead Time15-30 Days
Thickness1.4 mm
ApplicationCAT 318C / 319C / 320B / 320C / 320D / 323D
Aftermarket oil pan gasket (sump gasket) 5I-7666A — a direct replacement for the Caterpillar 5I-7666 gasket. It fits the Caterpillar 3066 / S6K / C6.4 diesel engine family (also 3064 / C4.2), commonly used on CAT 318C / 319C / 320B / 320C / 320D / 323D excavators. Thickness 1.4 mm. The oil pan gasket seals the joint between the cylinder block and the oil pan. When it hardens, splits or is over-tightened, oil weeps or drips from the pan joint — oil loss and a dirt-attracting film build up on the block and belly plate. It is normally renewed whenever the oil pan is removed. Fibre / composite gasket material, 1.4 mm thick, with pre-punched bolt holes. Confirm the removed gasket number and the pan shape before ordering; torque the pan bolts evenly and in sequence.

Key Features

  • Direct replacement for CAT 5I-7666
  • 1.4 mm thick, fibre / composite gasket
  • Fits Caterpillar 3066 / S6K / C6.4 (3064 / C4.2) engines
  • For CAT 318C / 319C / 320B / 320C / 320D / 323D excavators
  • Pre-punched bolt holes, ready to fit

Fits these machines

Caterpillar 320C Caterpillar 320D 318C 319C 320B 323D

Common Fault Symptoms

Oil weeping or dripping at the oil pan joint, oily film on the engine, increased oil consumption; severe cases blow the gasket out.

Installation Tips

  1. 1. Clean the block and oil pan faces; remove old gasket and degrease.
  2. 2. Check the pan rail is flat; straighten if distorted.
  3. 3. Fit the gasket dry (light sealant at split lines only) and start all bolts by hand.
  4. 4. Torque the pan bolts evenly in a cross pattern to the engine specification.

Technical Data

MaterialFibre / Composite Gasket
PackageCarton / Wooden Case
SystemEngine System
PositionLower
Manufacturer QMSISO9001
Warranty12 Months
Lead Time15-30 Days
MOQ10 pcs
PackagingCarton, Wooden Case
Delivery15-30 Days

Fits these machines

Caterpillar 320C Caterpillar 320D 318C 319C 320B 323D
Part NumberMachine ModelTypeAvailability
5I7666318C / 319C / 320BReplacement partIn Stock
CA5I7666318C / 319C / 320BReplacement partIn Stock
5I-7666A318C / 319C / 320BReplacement partIn Stock
5I-7666318C / 319C / 320BReplacement partIn Stock

This is a partial reference. Send your part number or machine model — we source and confirm it for you.

Part Number Cross Reference

Original (OEM)5I7666 / CA5I7666 / 5I-7666A / 5I-7666
Brand No.CA5I7666
Cross Reference5I-7666
Cross Reference5I7666
Cross ReferenceCA5I7666
What you're quietly worried about
We put it on the table and say exactly how we handle it.
ConcernImpactHow we help
Wrong part modelInstallation failure, extra costConfirmed by number, model and photos before shipment.
Unclear part numberDelays in sourcingWe identify the part from whatever info you have.
Poor qualityDowntime and complaintsStable replacement elements; every unit checked.
Slow responseProject delaysReply within 24 hours.
Many suppliersComplex procurement, higher costWide coverage, mixed orders from one source.
Shipping riskDamage or late arrivalExport packing and the right shipping method.
High MOQFinancial riskFlexible quantity — start small.
No after-salesProblems unresolvedWe 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

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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
Is 5I-7666A the same as 5I-7666?

5I-7666A is our replacement for the original Caterpillar 5I-7666 oil pan gasket. The original number is kept for cross-reference.

What is the thickness?

1.4 mm. Tell us the oil pan shape / engine if you are unsure.

What engine does it fit?

Caterpillar 3066 / S6K / C6.4 (also 3064 / C4.2), commonly on CAT 318C / 319C / 320B / 320C / 320D / 323D excavators.

Do I need sealant?

Fit dry with the specified torque; a light sealant can be used at any split lines. Always torque the pan bolts evenly in sequence.

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By Part Number
By Machine Model
By Photo
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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.

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