Caution: When turning the crankshaft, do not use the camshaft sprocket bolt for this, and do not turn the engine in the opposite direction, i.e. counterclock-wise.
1. Top dead center (TDC) - this is the highest position of the piston in the cylinder, which the piston reaches during its reciprocating motion when the crankshaft rotates. Each piston reaches TDC at the end of the compression stroke and after the end of the exhaust stroke, but TDC is usually referred to as the position of the piston on the compression stroke. Piston No. 1 - extreme from the side of the camshaft drive chain.
2. Setting piston No. 1 to TDC is an essential part of many operations, such as removing the camshaft drive chain and removing the camshaft itself.
3. Remove the camshaft cover as described in paragraph 4.
4. Using a suitable socket wrench, bolt the pulley/damper to the hub (on some models, to access it, you will need to remove the fan shroud and impeller) rotate the crankshaft clockwise until until the specified labels match (see Figure 3.4 a, b).
- A) The TDC mark on the crankshaft drive sprocket is aligned with the pointer on the camshaft drive cover.
- b) The TDC mark on the front camshaft flange is aligned with the boss on the front camshaft bearing cap.
Pic. 3.4a The TDC mark on the crankshaft drive sprocket is aligned with the pointer on the camshaft drive chain cover.
Pic. 3.4b The TDC mark on the camshaft front flange is aligned with the boss on the camshaft front bearing cap.
5. When the marks are aligned as described in step 4, piston #1 is at TDC before the ignition stroke. If the drive chain has been removed, do not rotate the camshaft and crankshaft until the chain has been reinstalled.