Mercury 1S7Z-6250-KA Camshaft

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Disconnect the negative cable from the battery, then remove the air cleaner intake duct and the valve cover. Next, take off the drivebelt, followed by the flange bolts, fulcrums, rocker arms, lifter guide retainer, lifter guides, and lifters, ensuring to keep the components in their original sequence by marking them or using a suitable container. Mark each lifter to indicate the front-facing end for proper reinstallation. Remove the ignition coil pack and the timing belt, then lock the camshaft pulley with a rod or large screwdriver to unscrew and remove the sprocket. Pull out the camshaft thrust plate, remove the cup plug from the transaxle end of the cylinder head, and carefully withdraw the camshaft. Inspect each lifter for wear and replace any that are worn. Check the camshaft for wear, particularly on the lobes, and replace it if there are any issues. Measure the camshaft bearing journals and cam lobe heights, comparing them to specifications, and replace the camshaft if necessary. Inspect the rocker arms for wear and replace them as pairs if needed. For installation, lubricate the camshaft bearings and lobes with engine assembly lube before inserting the camshaft, rotating it carefully to avoid damage. Install a new oil seal after the camshaft, apply thread locking compound to the pulley bolt threads, and reinstall the pulley, tightening it to the specified torque. Adjust the timing belt, lubricate the hydraulic lifters with engine oil before inserting them, and position them correctly. Finally, install the guides, retainers, rocker arms, and fulcrums in their original positions, tightening the bolts to the specified torque, and check the collapsed tappet clearance if any components are replaced.

To remove intake manifold start with the removal of the valve covers then proceed to go around the head and loosen the rocker arm bolts before swinging the rocker arms to the side. In case they are to be reused, some pushrods should be withdrawn from the engine and put in a place in a manner that they will not be mixed with others by using the pushrod holder. Subsequently, it is possible to pull valve lifters from the engine and to unscrew the timing chain cover. Unthread the camshaft sprocket assemble in such a manner that the engine is not rotated when this is being done. Go on to take off timing chain and sprockets and the bolts that hold the camshaft thrust plate to the engine block. Gently pull out the camshaft out of the engine ensure that the cam lobes do not damage the bearings. For the operations for the camshaft and lifters as for an inspection procedure, the following specific shall be followed. For installation, it is recommended that the camshaft journals be oiled whereas the cam lobes be lubricated with engine assembly lube when slotting it into position though being careful not to damage the bearings. The camshaft thrust plate should be bolted and tightened to the necessary tension, and the timing chain, as well as both sprockets, should then be fitted. In case of utilizing original hydraulic valve lifters, those must be as fitted in the original cylinder, and must be treated with engine assembly lube. Reverse all the removal steps as part of the final steps and if the system has a camshaft position sensor then it should be installed.

When working on the timing belt or chain, the camshaft sprockets need to be detached; before doing this ensure that they are labeled for reassembly purposes. The camshaft bearing caps are each numbered using a single digit, while those for the exhaust are labeled from 0 to 4, and those for the intake side, from 5 to 9; when reinstalling the caps, the visible side has the number. Turn the camshaft bearing cap bolts in a turning pattern of half a turn to free pressure on the valve springs. Slide out the caps, remembering the marks and dowels, next extract the camshafts and oil seals and the intake camshaft, which has a reference lobe on it. Label the contents of sixteen small containers so that cam followers' bearings remain with shims, not to aggravate wear. Inspect both camshafts vertically as well as horizontally, and the cam followers as well, to look for any overt tapering or ovality, coupled with the normal wear and tear signs and signs of overheating. Take the diameter of each journal and inspect running clearance with Plastigage; if any bearing is worn beyond this, change the camshaft or the cylinder head if required. On installation, rotate the engine back from TDC to avoid valve knocking, apply oil to the cam follower bores and to the cam followers, and correct orientation must be done during instalment. New camshaft oil seals are to be placed and the bearings are lubricated before reversing the position of the camshafts while the bearing caps are to be sealed. Tighten the caps in sequence, putting them straight to the cylinder head, and cleaning unwanted sealant off. Before the final assembly, check brittle valve clearances by rotating the crankshaft to TDC and installer the timing pin. Replace camshaft sprockets loosely, continue the reassembly in the same way using the timing belt or chain and setting the valve clearances. Once the battery connection is re-established, let the Powertrain Control Module perform its idle and fuel trim procedure as it will work most effectively.

When working on the timing belt or chain, the camshaft sprockets need to be detached; before doing this ensure that they are labeled for reassembly purposes. The camshaft bearing caps are each numbered using a single digit, while those for the exhaust are labeled from 0 to 4, and those for the intake side, from 5 to 9; when reinstalling the caps, the visible side has the number. Turn the camshaft bearing cap bolts in a turning pattern of half a turn to free pressure on the valve springs. Slide out the caps, remembering the marks and dowels, next extract the camshafts and oil seals and the intake camshaft, which has a reference lobe on it. Label the contents of sixteen small containers so that cam followers' bearings remain with shims, not to aggravate wear. Inspect both camshafts vertically as well as horizontally, and the cam followers as well, to look for any overt tapering or ovality, coupled with the normal wear and tear signs and signs of overheating. Take the diameter of each journal and inspect running clearance with Plastigage; if any bearing is worn beyond this, change the camshaft or the cylinder head if required. On installation, rotate the engine back from TDC to avoid valve knocking, apply oil to the cam follower bores and to the cam followers, and correct orientation must be done during instalment. New camshaft oil seals are to be placed and the bearings are lubricated before reversing the position of the camshafts while the bearing caps are to be sealed. Tighten the caps in sequence, putting them straight to the cylinder head, and cleaning unwanted sealant off. Before the final assembly, check brittle valve clearances by rotating the crankshaft to TDC and installer the timing pin. Replace camshaft sprockets loosely, continue the reassembly in the same way using the timing belt or chain and setting the valve clearances. Once the battery connection is re-established, let the Powertrain Control Module perform its idle and fuel trim procedure as it will work most effectively.

Only turn the engine in the normal direction of rotation - clockwise from the right-hand side of the vehicle.

Remove the timing belt.

1. Mount a dial indicator on the engine and position the plunger in-line with and resting on the first pushrod. 2. Zero the dial indicator, then very slowly turn the crankshaft in the normal direction of rotation until the indicator needle stops and begins to move in the opposite direction. The point at which it stops indicates maximum cam lobe lift. 3. Record this figure for future reference, then reposition the piston at TDC on the compression stroke. 4. Move the dial indicator to the remaining number one cylinder pushrod and repeat the check. Be sure to record the results for each valve. 5. Repeat the check for the remaining valves, following the firing order sequence.

Make sure the camshaft oil passages are clear and clean.

Remove the intake manifold.

Compress each valve spring and position each cam follower on its respective valve end and adjuster. Install the retaining spring clips, if equipped.

Ensure that the locating dowels are pressed firmly into their recesses and check that all mating surfaces are completely clean, unmarked, and free from oil. Apply a thin film of anaerobic sealant to the mating surfaces of each camshaft's front bearing cap.

If the lobes are in good condition and if the lobe lift measurements are as specified, the camshaft can be reused.

Remove the sprocket locating pin from the end of the camshaft.

Install the camshaft caps in the correct locations and follow the correct bolt tightening sequence, tightening the bolts to the specified torque.

Remove the timing chain.

Mount a dial indicator to the front of the cylinder head and measure the camshaft endplay of each camshaft. If the clearance is greater than the value, replace the camshaft or the cylinder head.

Ensure that the roller on each lifter turns freely and shows no signs of pitting, scoring, or other wear. Check the pushrod seat in each lifter for wear and ensure each lifter is in its original bore without excessive looseness.

Remove the timing chains. If you're only removing the camshafts from the rear bank cylinder head, you only have to remove the rear timing chain. If you're removing the camshafts from the front bank cylinder head, both timing chains will have to be removed.

Reinstall the remaining parts in the reverse order of removal, fill the crankcase with the recommended oil, and check for leaks after starting the engine.

During any operation that requires the removal of the cam followers, inspect the lash adjusters for damage or wear.