Mercury F7TZ-6250-AEE Camshaft

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Scrape off the Plastigage with your fingernail or the edge of a credit card-don't scratch or nick the journals or bearing surfaces.

Install the camshaft alignment tool to ensure the slots in the rear are level.

Liberally coat the camshaft journals and bearings with engine assembly lube or moly-base grease, then carefully install the camshaft in the cylinder head.

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

Repeat the procedure for the removal of the other camshaft.

Mount a dial indicator on the engine and position the plunger in-line with and resting on the first pushrod.

Lubricate the camshaft journals liberally with engine oil and apply engine assembly lube to the cam lobes.

To check the thrust plate for wear, install the camshaft in the cylinder head and position the thrust plate at the rear. Use a dial indicator to check the total endplay by prying the camshaft carefully back-and-forth. If the endplay is outside the limit, replace the thrust plate with a new one.

Slowly withdraw the camshaft from the engine, being careful not to nick, scrape, or otherwise damage the bearings with the cam lobes.

Install the retaining plate and screws.

They must be replaced as a complete set, and the camshaft must also be replaced.

Remove the timing chain.

To determine the extent of cam lobe wear.

Thread a long bolt into the camshaft that can be used to pull the camshaft from the engine block and also provide leverage to support the camshaft so the lobes don't get nicked or gouged on the bearings as it's withdrawn. Remove the camshaft carefully to avoid damaging the bearings.

Mount a dial indicator on the engine, position the plunger in-line with and resting on the first push rod, zero the dial indicator, then slowly turn the crankshaft until the indicator needle stops and begins to move in the opposite direction to find the maximum cam lobe lift.

Inspect the bearing journals for uneven wear, pits, and galling. Measure the inside diameter of each camshaft bearing and the camshaft bearing journals to determine if they are excessively worn or out-of-round.

Remove the valve covers.

Repeat the check for the remaining valves. Since each piston must be at TDC on the compression stroke for this procedure, work from cylinder-to-cylinder following the firing order sequence.

a) Clean the bearing surfaces and the camshaft journals with lacquer thinner or acetone. b) Carefully lay the camshaft(s) in place in the cylinder head. Don't install the rocker arms or lash adjusters and don't use any lubrication. c) Lay a strip of Plastigage on each journal. d) Install the camshaft caps. e) Remove the bolts and detach the caps. f) Compare the width of the crushed Plastigage to the scale on the Plastigage envelope to determine the oil clearance. g) If the clearance is greater than specified, and the diameter of any journal is less than specified, replace the camshaft. If the journal diameters are within specifications but the oil clearance is too great, the cylinder head is worn and must be replaced.