Sealed Power WH843CP Engine Piston
OE Quality 60-Day Returns
Sealed Power

Sealed Power WH843CP Engine Piston

Brand Sealed Power WH843CP
Bore (Inch) 3.9527
Bore (mm) 100.4000
Compression Distance 1.435
Head Illustration 23
Head Type Flat head; duroshield~ skirt coated piston
Minimum Clearance See piston fitting information on carton label
Note 1 Standard size
Note 2 Single piston
Package Alert Single piston
Part Material Hypereutectic
Pin Diameter (Inch) 0.9447
Pin Diameter (mm) 23.995
Pin Offset (Inch) 0.03
Pin Offset (MM) 0.762
Ring 1 Qty 1
Ring 1 Width 1.60mm
Ring 2 Qty 1
Ring 2 Width 1.75mm
Ring 3 Qty 1
Ring 3 Width 3.50mm
Standard Size Standard
Weight W Pin Gram 00648.+/- 00.
Fits Ford and Mercury · 10 vehicles

Standard size. Single piston for a straightforward replacement.

Hypereutectic material. Offers strength and heat resistance for demanding engine use.

DUROSHIELD skirt coating. Helps reduce friction for smoother piston movement.

Cross-references 2243423 for the same application. See all 1.

$67.54Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $67.54
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Engine Piston options

Sealed Power WH843CP Engine Piston

Sealed Power WH843CP is a standard-size hypereutectic engine piston built for specific Ford and Mercury applications. It features a flat head, DUROSHIELD skirt coating, and a 1.435-inch compression distance for precise engine rebuild work.

Key Features

  • Part number WH843CP from Sealed Power
  • Standard-size piston with a 3.9527-inch bore (100.4000 mm)
  • Hypereutectic material for controlled thermal expansion
  • Flat head design with DUROSHIELD skirt coating
  • 1.435-inch compression distance
  • Pin diameter: 0.9447 inch (23.995 mm)
  • Pin offset: 0.03 inch (0.762 mm)
  • Three-ring groove setup with widths of 1.60 mm, 1.75 mm, and 3.50 mm

Product Details

WH843CP is engineered for engine rebuilds that require a standard-size piston with the listed bore, pin, and compression specifications. Sealed Power uses modern materials and ISO- and QS-certified manufacturing practices to produce components that meet the demands of current engine service work. This piston fits 1997-2001 Ford Explorer, 2001 Ford Ranger, and 1998-2001 Mercury Mountaineer, making it a direct-match option for those vehicle-specific applications. The WH843CP part number is also referenced by interchange number 2243423.

Common Repair Uses

  • Restoring cylinder compression in worn engines
  • Replacing a damaged or scored piston during overhaul
  • Addressing piston-to-cylinder fit issues in rebuilds
  • Correcting ring groove wear found during teardown
  • Supporting engine service on Ford Explorer, Ford Ranger, and Mercury Mountaineer applications

Installation Notes

Verify bore size, compression distance, pin diameter, and ring groove widths before assembly. Minimum clearance is listed as “See Piston Fitting Information on carton label,” so confirm piston-to-cylinder clearance during machine work and final fitment. Match the piston to the correct engine specification and follow standard rebuild procedures for ring selection, lubrication, and break-in.

Quality Assurance

Sealed Power manufactures this piston using controlled processes and certified production standards to support consistent rebuild quality. The DUROSHIELD skirt coating and hypereutectic construction are selected to help maintain stable operation in service.

Related reading

This part fits 10 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersNotes
2001FordExplorer4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
2001FordRanger4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
2001MercuryMountaineer4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
2000FordExplorer4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
2000MercuryMountaineer4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
1999FordExplorer4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
1999MercuryMountaineer4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
1998FordExplorer4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
1998MercuryMountaineer4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
1997FordExplorer4.0LV61 Piston; 3 Ring Piston; 1.435 (in) Compression Distance; Flat Head; Hypereutectic Alloy Piston; Ring Groove Widths: 1.6 (mm) , 1.75 (mm) , 3.5 (mm); DUROSHIELD Skirt Coated Piston; Sold Individually; Standard
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
2243423