TL L5-2451cc 2.5L SOHC G25A4 FI (1995)
Valve Guide: Service and Repair
REPLACEMENT
1. As illustrated in the image, use a commercially available air-impact valve guide driver attachment modified to fit the diameter of the valve guides.
In most cases, the same procedure can be done using the special tool and a conventional hammer.
2. Select the proper replacement guides, and chill them in the freezer section of a refrigerator for about an hour.
3. Use a hot plate or oven to evenly heat the cylinder head to 300°F (150°C). Monitor the temperature with a cooking thermometer.
CAUTION:
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Do not use a torch; it may warp the head.
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Do not get the head hotter than 300°F (150°C); excessive heat may loosen the valve seats.
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To avoid burns, use heavy gloves when handling the heated cylinder head.
4. Working from the camshaft side, use the driver and an air hammer to drive the guide about 2 mm (0.1 inch) towards the combustion chamber.
This will knock off some of the carbon and make removal easier.
CAUTION:
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Always wear safety goggles or a face shield when driving valve guides.
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Hold the air hammer directly in line with the valve guide to prevent damaging the driver.