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Pushrod engine
Make sure all the pushrods are engaged with their rockers before you tighten any nuts or bolts. Before refitting the head to an OHC engine, set No.1 cylinder to TDC and line up the corresponding marks on the camshaft drive belt sprocket. A chain-drive sprocket has similar marks.rotary oil seals Superior quality.
Make sure all the pushrods are engaged with their rockers before you tighten any nuts or bolts.rubber sealing.
Before refitting the head to an OHC engine, set No.1 cylinder to TDC and line up the corresponding marks on the camshaft drive belt sprocket. A chain-drive sprocket has similar marks.
After tightening the head bolts, refit the pushrods in their original places, followed by the rocker shaft or separate rockers.
In either type, be sure that the upper end of each pushrod is engaged with its rocker and that the lower end is seated in the tappet before tightening the nuts or bolts.
Tighten rocker-shaft nuts or bolts in the recommended sequence and to the recommended torque – consult the car service manual or a dealer.rotary oil seals Superior quality.
Overhead-cam enginering seal.
Before installing the cylinder head, turn the crankshaft with a spanner on the pulley nut until No. 1 piston is at its top-dead-centre (TDC) position of its compression stroke.
Verify this from the TDC mark on the crankshaft pulley. Turn the camshaft until the mark on its sprocket is in the correct position for No. 1 cylinder firing. Now refit the head and tighten its bolts.
Check that the crankshaft and camshaft are still at their marks, then refit the drive belt or chain.
Slowly turn the crankshaft two full turns in the normal direction of engine rotation.rotary oil seals Superior quality.
Make sure the timing marks are again in alignment then, for a belt-driven camshaft only, adjust the tensioner (See Adjusting a camshaft timing belt).
If the marks do not line up, reposition the crankshaft first, then the camshaft.rotary oil seals Superior quality.nok seal.