Measure the thickness of the cam follower using a micrometer

VVT-i engines

Without the Toyota tool

Measure the clearance between the camshaft lobe and the cam follower

11 Repeat this procedure until all the valves which are out of clearance have been corrected.

12 Installation of the spark plugs, cylinder cover, spark plug leads and boots, etc. is the reverse of removal.

13 After all the valve clearances have been measured, if any require adjustment, remove the camshafts as described in Chapter 2A.

14 Use a small flat-bladed screwdriver to carefully prise the relevant shim from the cam follower.

15 Select the required shim as described in paragraphs 8 and 9, then place the shim on the top of the relevant cam follower.

16 Once all the necessary shims have been changed, refit the camshafts as described in

Chapter 2A.

17 Remove the cylinder head cover and position the engine at TDC for No 1 cylinder, as described in Chapter 2A.

18 Using feeler gauges, measure the clearance between the camshaft lobes and the cam followers of the intake valves for cylinders

1 and 2, and the exhaust valves for cylinders

1 and 3. No 1 cylinder is at the timing chain end of the engine. Record the measurements obtained (see illustration).

19 Turn the crankshaft one complete revolution (360°).

20 Using feeler gauges, measure the

clearance between the camshaft lobes and the cam followers of the intake valves for cylinders 3 and 4, and the exhaust valves for cylinders 2 and 4. Record the measurements obtained.

21 Compare the measurements obtained with those given in the Specifications. If any measure is outside the specified range, remove the camshafts as described in Chap-ter 2A.

22 With the camshafts removed, use a magnet to lift the relevant cam follower(s) from place, then measure and record the thickness of the follower using a micrometer (see illustration).

23 Determine the required thickness of the new follower using the following formula:

Intake followers: N = T+(A-0.20 mm). Exhaust followers: N = T+(A-0.30 mm).

A = Measured valve clearance.

N = Thickness of new follower.

T = Thickness of the used follower.

24 Select a follower with a thickness as close as possible to the valve clearance calculated. Followers, which are available in 35 sizes in increments of 0.020 mm, range in size from 5.060 mm to 5.740 mm.

25 With all the followers in their correct locations, refit the camshafts as described in Chapter 2A. Before refitting the cylinder head cover, recheck the valve clearances as previously described, and, if necessary, remove the camshafts again and change followers as necessary.

2A•1

Chapter 2 Part A:

Engine in-car repair procedures

Дата добавления: 2014-12-23