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Cap Screw (Part No. 24987-52) Cap Screw Gasket (Part No. 24994-52) Check Valve Spring (Part No. 24992-52) Check Valve Ball (Part No. 8856) Screen Housing and Check Valve Ball

Seat (Part No. 24985-52) Screen Assembly (Part No. 24975-52) Cork Seals (two) (Part No. 24990-52) Crankcase Well for Screen Assembly hook in crankcase well (8) engage it with one of the ing (5) and pull housing out of well. Be careful ball (4).

Starting with engine number about 52FL3529 (can also be identified by boss and cap screw at the side of rear tappet guide) a screen and check valve were incorporated in the oil passage leading to overhead fittings and hydraulic push rod units.

The purpose of the screen (6) is to keep foreign matter from entering the hydraulic push rod units.

The purpose of the check valve ball (4) is to prevent oil in the overhead passage from draining back when engine is not running, thus maintaining a head of oil, so push rod hydraulic units that have leaked down under open valve load will fill quickly when engine is started. At the time of every oil change (at intervals not exceeding 2000 miles) or at any time hydraulic push rod operation may become erratic, screen should b e removed and thoroughly flushed and cleaned, or better still, discard it and replace with a new screen.

To remove screen first remove items 1, 2 and 3; then bend one end of a piece of wire to form a hook about l/l6" long. Insert holes (see illustration) in hous-that you do not lose check valve

With a pointed instrument engaged in hole in base of screen assembly (6), turn the assembly so notch lines up with key in housing, and remove screen. After cleaning or exchanging screen reinstall it in housing and secure it by turning so that engaging notch is approximately 180° from housing key.

It is not necessary to remove or renew the cork seals (7)^every time screen is removed for cleaning or replacing unless they show signs of being damaged. If they are removed for any reason, care must be exercised when installing that they be fully seated in bottom of crankcase well. In no case install more than two seals. More than two seals will block the oil passage from well to overhead fittings.

Note: As mentioned above, at any time push rod operation becomes erratic, the screen should be removed and cleaned - also oil pump pressure should be checked with a pressure gauge attached to oil pump. The screen should be removed and cleaned first.

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