REMOVAL & INSTALLATION
See Figures 1, 2 and 3
Press-out valve guide replacement requires the use of a valve guide installer (Mazda Part No. 49 0221 251A or equivalent) and hammer from the side opposite the combustion chamber.
- If not already done, remove the valve spring, valve stem seal and valve, as previously outlined.
- Invert the cylinder head and position the special removal/installation tool against the valve guide. Carefully strike the tool with the hammer until the valve guide comes free of the cylinder head.
- Attach the clip to the new valve guide, if necessary.
On diesel engines, the longer guides go on the intake side, and the shorter ones on the exhaust side. Do not interchange them.
- Using the same removal/installation tool and hammer, tap in a new guide from the side opposite the combustion chamber, stopping when the clip on the guide just touches the cylinder head. Be sure to hit the end of the tool as squarely as possible.
On 1.5L engines, the intake and exhaust valve guides are different; do not interchange them. On 1983-87 2.0L (Code FE) and 3.0L engines, although the intake and exhaust valve guides originally used were different shapes, exhaust type guides should be used for replacement on both sides.
- Check for the proper valve guide extension. Dimension "A" (from the valve spring seating surface to the top of the guide) should be 0.752-0.772 in. (19.0-19.5mm) for 2.0L (Code FE and RF) engines. On the 1.6L non-turbo engines, this dimension must be 0.520-0.543 in. (13.2-13.8mm). On 1.6L turbo engines, the dimension should be 0.661-0.685 in. (16.8-17.4mm). On 2.2L engines, the dimension should be 0.780-0.799 in. (19.8-20.3mm). On 3.0L engines, the dimension should be 0.520-0.543 in. (13.2-13.8mm) intake and 0.772-0.795 in. (19.6-20.2mm) exhaust.
- Install a new valve stem seal, using Valve Seat Pusher 49 G030 160 or equivalent. Be sure that the seal is properly seated; otherwise, oil could work its way down the valve stem.