Timken 226840 Engine Crankshaft Seal - Rear

Timken 226840 Rear Crankshaft Seal

The Timken 226840 engine crankshaft seal is built for rear crankshaft sealing applications where lubricant control and contamination exclusion matter. Its V-fluoro-elastomer material, reinforced outer case, and ribbed inner diameter are engineered to support a secure seal on the shaft and housing surfaces.

Compatible with Mazda RX-8 rear applications from 2004-2011 and Mazda RX-7 rear applications from 1979-1991 and 1993-1995, this seal is a direct-fit option for rotary engine service work. The Timken 226840 is designed for Mazda RX-8 rear crankshaft seal replacement and Mazda RX-7 rear main seal service where precise sealing dimensions are required.

• V-fluoro-elastomer construction for sealing performance in engine applications
• Reinforced outer case helps resist installation damage
• Ribbed rubber inner diameter supports sealing over minor spindle imperfections
• Internal contamination exclusion system helps block debris entry
• Vent holes promote lubricant flow around the seal lip to reduce heat build-up
• Dimensions: 0.512 in. width, 3.752 in. outside diameter, 2.677 in. shaft diameter, 3.740 in. housing bore

Detailed Application Coverage

Fits 2004-2011 Mazda RX-8, Rear. Fits 1993-1995 Mazda RX-7, Rear, 225mm Clutch; Viton. Fits 1979-1991 Mazda RX-7, Rear, 225mm Clutch; Viton. This part cross-references SKF 26661 for the same application. Timken 226840 is specified for rear crankshaft sealing in these Mazda rotary engine platforms, where maintaining oil control at the rear of the engine is critical.

What This Seal Helps Address

• Rear crankshaft oil leakage
• Grease or lubricant escape at the seal interface
• Contamination entering the crankshaft sealing area
• Heat-related seal wear from poor lubricant circulation
• Seal fit issues caused by minor shaft surface imperfections

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal orientation before installation. Clean the sealing surface thoroughly and inspect for scoring, burrs, or contamination that could affect lip contact. Use care during installation to avoid distorting the reinforced outer case, and confirm the seal seats evenly in the housing.

Quality Assurance

Timken oil and grease seals are built with precision sealing designs to help keep lubricant in and contaminants out. The reinforced case, contamination exclusion features, and vented lip design reflect Timken’s focus on durable sealing performance for engine service.