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Home >> Toyota >> 1994 >> Pickup Base >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments - 4-CYL >> Valve Clearance

Valve Clearance

NOTE: On Pickup, adjust valve clearance with engine at normal operating temperature.
  1. Check and adjust valve clearance with engine at normal operating temperature. Remove valve cover and gasket. Rotate crankshaft pulley so groove on crankshaft pulley aligns with "0" mark on front cover and cylinder No. 1 (front cylinder) is at TDC on compression stroke.
    Fig 1: Rotating Engine With Accessory Drive Shaft
    G92G24774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Ensure rocker arms on cylinder No. 1 are loose and rocker arms on cylinder No. 4 are tight. If rocker arms are not as described, rotate crankshaft 360 degrees and realign groove on crankshaft pulley with "0" mark on front cover.
  3. Using feeler gauge, check intake valve clearance between rocker arm and valve stem on cylinders No. 1 and 2 and exhaust valve clearance on cylinders No. 1 and 3. See Fig 2. Valve clearance should be within specification. See VALVE CLEARANCE SPECIFICATIONS  table.
    Fig 2: Identifying 4-Cyl. Valve Arrangement
    G92J24801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Adjust valve clearance if necessary by loosening adjusting screw lock nut and rotating adjusting screw. Tighten lock nut. Recheck valve clearance. See SHIM THICKNESS  table. Shim thickness can also be determined by using the following formula: N = T + A.
    • N = Thickness of adjuster shim required.
    • T = Thickness of adjuster shim removed.
    • A = Measured clearance minus valve clearance specification.
  5. Rotate crankshaft 360 degrees, and realign groove on crankshaft pulley with "0" mark on front cover. Check intake valve clearance on cylinders No. 3 and 4 and exhaust valve clearance on cylinders No. 2 and 4. Adjust valve clearance if necessary.
  6. Apply sealant at half-circular plugs-to-cylinder head surfaces where valve cover gasket seals. Half-circular plugs are located at front and rear of cylinder head. Install valve cover using NEW gasket.
NOTE: If valve cover uses grommets below retaining nuts or bolts, keep grommets in order so they are installed in original locations during reassembly.
Fig 3: Removing & Installing Valve Clearance Adjusting Shim
G94G44236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
VALVE CLEARANCE SPECIFICATIONS

Application (1) In. (mm)
Exhaust .012 (.30)
Intake .008 (.20)
(1) On Pickup, adjust valve clearance with engine at normal operating temperature.
SHIM THICKNESS

Thickness mm (in.) Shim No.
2.50 (0.0984) 1
2.55 (0.1004) 2
2.60 (0.1024) 3
2.65 (0.1043) 4
2.70 (0.1063) 5
2.75 (0.1083) 6
2.80 (0.1102) 7
2.85 (0.1122) 8
2.90 (0.1142) 9
2.95 (0.1161) 10
3.00 (0.1181) 11
3.05 (0.1201) 12
3.10 (0.1220) 13
3.15 (0.1240) 14
3.20 (0.1260) 15
3.25 (0.1280) 16
3.30 (0.1299) 17
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