Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Direct Clutch: Inspection
1998 Lexus SC 300SECTION Inspection
- Clean all components (except discs) with solvent. Dry with compressed air. Inspect plates and discs for flaking or burnt areas.
- Ensure check ball is free in clutch piston. Apply air pressure to check ball area. Ensure check ball does not allow air to bleed through piston. Measure free length of piston return spring. On all models except Supra Turbo, length should be .839" (21.32 mm). On Supra Turbo, length should be .915" (23.25 mm).
- Measure inside diameter of clutch drum bushing. Replace clutch drum if bushing diameter exceeds specification. See DIRECT CLUTCH DRUM BUSHING SPECIFICATIONS table.
DIRECT CLUTCH DRUM BUSHING SPECIFICATIONS
| Application | In. (mm) |
|---|---|
| GS300, LS400 & SC400 | 2.124 (53.97) |
| Previa | 2.126 (53.99) |
| SC300 | 2.126 (53.99) |
| Supra | 2.124 (53.97) |
CAUTION:
Clutch discs should be soaked in ATF for 15 minutes prior to installation. Thrust washers and races should be coated with petroleum jelly prior to installation.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.