Celica Coupe L4-132 2164cc 2.2L DOHC (5S-FE) (1992)
Remove the valve cover and inspect the valve clearances. A valve which is bent will be stuck in the open position or will have an excessively
larger clearance.
Perform a compression check or a cylinder leak down check. Cylinders with bent valves will have very low compression (<50.0 psi) and will not
hold pressure.
If valve damage is detected the cylinder head will have to be removed and the damaged valves replaced. Also inspect top of the pistons for
damage.
Initial Checks
INITIAL CHECKS (PRIOR TO REMOVAL)
PURPOSE
Checking and recording the ignition timing and manifold vacuum level before and after the timing belt replacement allows for two assurances:
-
Initial conditions are correct.
-
Verifies the quality of the job after the belt has been installed.
CHECK TIMING: See: Tune-up and Engine Performance Checks/Ignition Timing/Adjustments
WHY
Ignition Timing
Ignition timing is the position of the piston on its compression stroke when the ignition coil fires the associated sparkplug.
Ignition timing is affected by two sources.
-
Physical rotation of the distributor.
-
Alignment of the camshaft and crankshaft via the timing belt.
Prior to replacing the timing belt it is very important to verify that this relationship is correct. If the timing belt is installed correctly the
after-repairs timing check should be within 2 degrees of the pre-repairs timing check.
NOTE: Minor differences, +/- 2 degrees may result from original belt stretching as it aged.
If the timing belt is initially installed incorrectly, the pre-repairs ignition timing may not be correct, and the after-repairs timing will differ
greatly from the initial.
Checking the timing before and after the job will help prevent confusion and verify the job was done correctly.
Notes on Timing: