Engine Performance Adjustments Toyota Land Cruiser 80 рестайлинг

ENGINE MECHANICAL

Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

1. Check and adjust valve clearance with engine cold. Drain cooling system. Remove throttle body for access to valve cover. Remove valve cover and gasket. Rotate crankshaft pulley in direction of engine rotation so crankshaft pulley groove aligns with "0" mark on timing chain cover and cylinder No. 1 (front cylinder) is at TDC on compression stroke.
2. Ensure 1-dot and 2-dot timing marks on camshaft sprockets are aligned. (Scheme 2) If timing marks are not aligned, rotate crankshaft pulley in direction of engine rotation one full revolution (360 degrees).
3. Ensure valves on cylinder No. 1 are loose. Using feeler gauge, measure and record valve clearance of intake valves on cylinders No. 1, 2 and 4, and exhaust valves on cylinders No. 1, 3 and 5. (Scheme 5) NOTE: Check and adjust valve clearance with engine cold.
4. Rotate crankshaft pulley clockwise one full revolution (360 degrees) and realign crankshaft pulley groove with "0" mark on timing chain cover. Using feeler gauge, measure and record valve clearance of intake valves on cylinders No. 3, 5 and 6, and exhaust valves on cylinders No. 2, 4 and 6. (Scheme 5)
5. Ensure valve clearance is within specification. See «VALVE CLEARANCE SPECIFICATIONS»(/toyota/land-cruiser/80-1995-1997/remont/adjustments/#engine-performance-adjustments) table. VALVE CLEARANCE SPECIFICATIONS Application (1) In. (mm) Intake.006-.010 (.15-.25) Exhaust.010-.014 (.25-.35) (1) Adjust valve clearance with engine cold.
6. If valve clearance adjustment is required on any valve except rear valves on cylinder No. 6, rotate crankshaft pulley so camshaft lobe is facing upward on valve to be adjusted. Rotate valve lifter so notch area on valve lifter is toward spark plug.
7. Valve Clearance Adjuster (SST 09248-55050) is used for adjusting valve clearance. Press valve lifter downward using SST "A" of valve clearance adjuster. (Scheme 1) Install SST "B" between camshaft and valve lifter. Remove SST "A".
8. Using small screwdriver and magnet, remove adjusting shim. Using micrometer, measure thickness of removed adjusting shim. Using measured clearance and adjusting shim thickness, determine correct thickness of adjusting shim to be used. (Scheme 3)and (Scheme 4).
9. Install proper adjusting shim. Using SST "A", press downward on valve lifter and remove SST "B". Recheck valve clearance.
10. If valve clearance adjustment is required on rear valves on cylinder No. 6, manufacturer states to remove camshafts for access to adjusting shim. See appropriate article in ENGINES in section.
11. Using small screwdriver and magnet, remove adjusting shim. Using micrometer, measure thickness of adjusting shim removed. Using measured clearance and adjusting shim thickness, determine correct thickness of adjusting shim to be used. (Scheme 3)and (Scheme 4). Install adjusting shim and camshaft. Recheck valve clearance.
12. Once all valves are properly adjusted, install valve cover and throttle body using NEW gaskets. Check and adjust ignition timing if distributor was removed. See «IGNITION TIMING»(/toyota/land-cruiser/80-1995-1997/remont/adjustments/#engine-performance-adjustments__ignition-timing).

IGNITION TIMING

1. Start and warm engine to normal operating temperature. Shut engine off. Connect timing light to spark plug wire on cylinder No. 1 (front cylinder at timing chain end of engine). Remove cover and connect scan tester to data link connector No. 3. (Scheme 6) Scan tester is used to read engine RPM.
2. Apply parking brake. Place transmission in Neutral. Start engine and maintain engine at 2500 RPM for 90 seconds and then allow engine to idle. Ensure idle speed is 600-700 RPM.
3. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 of data link connector No. 1. (Scheme 7) NOTE: Timing marks are located on front cover.
4. Ensure base timing is within specification at idle with transmission in Neutral, and with A/C and all accessories off. See «IGNITION TIMING»(/toyota/land-cruiser/80-1995-1997/remont/adjustments/#engine-performance-adjustments) table.
5. If base timing is incorrect, loosen distributor hold-down bolt. Rotate distributor to obtain correct base timing. Tighten distributor hold-down bolt. Recheck base timing.
6. Remove jumper wire from data link connector No. 1. Ensure ECM controlled timing is within specification. See «IGNITION TIMING»(/toyota/land-cruiser/80-1995-1997/remont/adjustments/#engine-performance-adjustments) table. Shut engine off. Remove jumper wire, timing light and scan tester.

IGNITION TIMING (Degrees BTDC @ Idle) (1)

Scheme 6

Scheme 7

IDLE SPEED & MIXTURE

Note. Mixture adjustment is not possible on any model.

Note. Check and adjust idle speed with air cleaner installed, all air intake system hoses and vacuum lines connected, electronic fuel injection system wiring connectors tight, transmission in Neutral, ignition timing properly set, electric cooling fan off (if equipped),A/C and all accessories off, and engine at normal operating temperature.

1. Start and warm engine to normal operating temperature. Shut engine off. Remove cover and connect scan tester to data link connector No. 3. (Scheme 6) Scan tester is used to read engine RPM.
2. Apply parking brake. Place transmission in Neutral. Start engine and maintain engine at 2500 RPM for 90 seconds and then allow engine to idle. Ensure idle speed is within specification. See «IDLE SPEED SPECIFICATIONS»(/toyota/land-cruiser/80-1995-1997/remont/adjustments/#engine-performance-adjustments) table.
3. If idle speed is not within specification, check Idle Air Control (IAC) valve, wiring and Electronic Control Module (ECM). See IDLE CONTROL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article. Shut engine off. Remove scan tester.

IDLE SPEED SPECIFICATIONS (1)

THROTTLE POSITION SENSOR

1. Disconnect electrical connector from Throttle Position (TP) sensor. Loosen TP sensor mounting screws. Connect ohmmeter between terminals IDL and E2. (Scheme 8)
2. Apply vacuum to throttle opener. To set initial clearance, insert proper thickness feeler gauge between throttle stop screw and throttle lever. See «THROTTLE POSITION SENSOR ADJUSTMENT»(/toyota/land-cruiser/80-1995-1997/remont/adjustments/#engine-performance-adjustments) table.
3. With ohmmeter showing no continuity, rotate TP sensor clockwise until continuity exists. Tighten TP sensor mounting screws. Using specified feeler gauge, recheck for continuity and no continuity at adjusted clearances. Disconnect ohmmeter. Install electrical connector on TP sensor.

THROTTLE POSITION SENSOR ADJUSTMENT

Scheme 8

DASHPOT & THROTTLE VALVE OPENER CONTROL SYSTEM

For testing and adjustment procedures, see THROTTLE CONTROLS in SYSTEM & COMPONENT TESTING article.

See also:
• VALVE CLEARANCE SPECIFICATIONS
• IGNITION TIMING