22844908 Volvo.Penta Sprocket

Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g00296424
Cylinder and valve location
(A) Exhaust valves
(B) Inlet valves Valve Lash
Valve Lash Setting
The temperature of the engine does not change the valve lash setting.Valve Lash Setting Inlet valve ... 0.20 mm (0.008 inch)Exhaust valve ... 0.45 mm (0.018 inch)Valve Lash Adjustment
If the valve lash requires adjustment several times in a short period of time, excessive wear exists in a different part of the engine. Repair the problem in order to prevent more damage to the engine.Not enough valve lash can be the cause of rapid wear of the camshaft and valve lifters. Not enough valve lash can indicate that the seats for the cylinder head valves are worn.Cylinder head valves become damaged due to the following causes:
Fuel injection nozzles operate incorrectly.
Excessive dirt and oil are present on the filters for the inlet air.
The fuel injection pump has incorrect fuel settings.
The load capacity of the engine is frequently exceeded.Too much valve lash can cause broken valve stems, broken springs, and broken spring retainers. Too much valve lash can be an indication of the following problems:
Worn camshaft and valve lifters
Worn rocker arms
Bent pushrods
Broken socket on the upper end of a pushrod
Loose adjustment screw for the valve lashIf the camshaft and valve lifters show rapid wear, look for fuel in the lubrication oil or dirty lubrication oil as a possible cause.The valve lash is measured between the top of the valve stem and the rocker arm lever.Note: No. 1 cylinder is at the front of the engine.
Illustration 2 g00323903
Setting The Valve Lash
(1) Adjustment screw
(2) Feeler gauge Perform the following procedure in order to adjust the valve lash:
Set the top center position for No. 1 piston on the compression stroke. Before adjustments are made, lightly tap each rocker arm at the top of the adjustment screw. Use a soft mallet to ensure that the lifter seats against the camshaft's base circle.
Measure the valve lash for the inlet and exhaust valves on cylinder 1. If necessary, make an adjustment to the valve lash on the inlet and the exhaust valves for No. 1 cylinder. Note: The 3054B Industrial Engines require the use of a TORX T27 driver to adjust valve lash.
Loosen the locknut that is on the adjustment screw (1).
Place the appropriate feeler gauge (2) between the rocker arm and the valve. Turn the adjustment screw (1) while the locknut is being held from turning. Adjust the valve lash until the correct specification is achieved.
After each adjustment, tighten the locknut while the valve adjustment screw (1) is being held from turning.
Turn the crankshaft for 180 degrees in the direction of the normal engine rotation. Measure the valve lash of the inlet valve and the exhaust valve of number 3 cylinder. If necessary, make an adjustment to the inlet valve and the exhaust valve on number 3 cylinder.
Loosen the locknut that is on the adjustment screw (1).
Place the appropriate feeler gauge (2) between the rocker arm and the valve. Turn the adjustment screw (1) while the locknut is being held from turning. Adjust the valve lash until the correct specification is achieved.
After each adjustment, tighten the locknut while the valve adjustment screw (1) is being held from turning.
Turn the crankshaft for 180 degrees in the direction of the normal engine rotation. Measure the valve lash of the inlet valve and the exhaust valve of number 4 cylinder. If necessary, make an adjustment of the valve lash on number 4 cylinder.
Loosen the locknut that is on the adjustment screw (1).
Place the appropriate feeler gauge (2) between the rocker arm and the valve. Turn the adjustment screw (1) while the locknut is being held from turning. Adjust the valve lash until the correct specification is achieved.
After each adjustment, tighten the locknut while the valve adjustment screw (1) is being held from turning.
Turn the crankshaft for 180 degrees in the direction of the normal engine rotation. Measure the valve lash of the inlet valve and the exhaust valve of number 2 cylinder. If necessary, make an adjustment of the valve lash on number 2 cylinder.
Loosen the locknut that is on the adjustment screw (1).
Place the appropriate feeler gauge (2) between the rocker arm and the valve. Turn the adjustment screw (1) while the locknut is being held from turning. Adjust the valve lash until the correct specification is achieved.
After each adjustment, tighten the locknut while the valve adjustment screw (1) is being held from turning. Cylinder Head
Inspect The Cylinder Head
Table 1
Required Tools
Part Number Part Description Qty
8S-6691 Cylinder Head Repair Stand 1
Remove the cylinder head from the engine.
Remove the water temperature regulator housing.
Remove the valve springs and valves.
Clean the cylinder head thoroughly. Make sure that the contact surfaces of the cylinder head and the cylinder block are clean, smooth and flat.
Inspect the bottom surface of the cylinder head for pitting, for corrosion, and for cracks. Inspect the area around the valve seat inserts and the holes for the fuel injection nozzles.