Hydrostatic Locked Engine

When an engine is suspected to be hydrostatically locked, regardless of what caused the problem, the following steps should be used.

CAUTION: DO NOT use starter motor to rotate the engine, severe damage may occur.

1. Inspect air cleaner, induction system and intake manifold to insure system is dry and clear of foreign material.
2. Remove negative battery cable.
3. Place a shop towel around the spark plugs when removing them from the engine. This will catch any fluid that may possibly be in the cylinder under pressure.
4. With all spark plugs removed, rotate engine crankshaft using a breaker bar and socket.
5. Identify the fluid in the cylinder(s) (i.e., coolant, fuel, oil or other).
6. Make sure all fluid has been removed from the cylinders. Inspect engine for damage (i.e., connecting rods, pistons, valves, etc.)
7. Repair engine or components as necessary to prevent this problem from re-occurring.

CAUTION: Squirt approximately one teaspoon of oil into the cylinders, rotate engine to lubricate the cylinder walls to prevent damage on restart.

8. Install new spark plugs.
9. Drain engine oil and remove oil filter.
10. Fill engine with specified amount of approved oil and install new oil filter.
11. Connect negative battery cable.
12. Start engine and check for any leaks.

LASH ADJUSTER-BLEEDING
Use this procedure to manually bleed aerated oil from the lash adjuster and remove sponginess.
1. Run the engine, bringing it to operating temperature in order to freshly pressurize and warm the valve train system oil supply.
2. Remove cylinder head cover(s).





Fig. 19

3. Ensure the rocker arm is positioned on the base circle of the cam (Fig. 19). Rotate engine as necessary.
4. For intake rocker arm positions:





Fig. 20

a. Adjust Special Tool 8351 Release Probe's gauge pin to extend approximately 20 mm (0.787 inch). Then, carefully insert the release probe gauge pin into the lash adjuster service access hole (Fig. 20).

CAUTION: If probe tip breaks off within the lash adjuster, replace the affected rocker arm.

b. Gently unseat lash adjuster's internal check ball.
c. While the internal check ball is held unseated, press the rocker arm into the valve tip, allowing the lash adjuster to fully collapse. Hold this fully collapsed position for about one second, or longer.
d. Slowly release the rocker arm, thereby allowing the lash adjuster to extend, which in turn refills the high pressure chamber with non-aerated oil.
e. Remove probe to allow check ball to seat.
f. Recheck for sponginess. If the lash adjuster sponginess is not completely or nearly eliminated, then repeat procedure.
g. If the spongy condition cannot be removed, replace effected rocker arm(s).
5. For exhaust rocker arm positions:
a. Adjust Special Tool 8351 Release Probe's gauge pin to extend approximately 20 mm (0.787 inch). Then, using two release probes, carefully insert gauge pins into the lash adjuster service access holes (Fig. 20).

CAUTION: If probe tip breaks off within the lash adjuster, replace the affected rocker arm.

b. Gently unseat BOTH lash adjuster's internal check ball at the same time.
c. While the internal check ball is held unseated, press the rocker arm into the valve tip, allowing the lash adjuster to fully collapse. Hold this fully collapsed position for about one second, or longer.
d. Slowly release the rocker arm, thereby allowing the lash adjuster to extend, which in turn
refills the high pressure chamber with non-aerated oil.
e. Remove probes to allow check balls to seat.
f. Recheck for sponginess. If the lash adjuster sponginess is not completely or nearly eliminated, then repeat procedure.
g. If the spongy condition cannot be removed, replace effected rocker arm(s).
6. Install cylinder head cover(s).