Oil Strainer O-Ring Replacement - Correct Size Identification

Engineintermediate✓ Community Verified

Problem

During engine rebuild, the O-ring between the oil strainer and oil pump needs replacement, but the original is too deteriorated to measure and the correct replacement size is difficult to source from standard parts stores.

Original O-ring deteriorated beyond measurement during engine rebuildToyota part number 96721-19025 initially reported as discontinuedStandard O-ring kits at parts stores do not contain the correct sizeParts counter staff unfamiliar with SAE dash number or JIS sizing systems

Root Cause

The oil strainer-to-pump O-ring is a specialty size (JIS S24) not commonly stocked in standard O-ring assortment kits, making sourcing difficult during rebuilds. The O-ring degrades over time and must be replaced to prevent air ingestion into the oil system.

Confidence

Moderate confidence — Multiple community members agreed on this solution

View Original Thread →Posted April 2020 on SupraForums.com