Ford CSG-649 — Valve Clearance Adjustment
Adjustments · Valve train / hydraulic tappet
For the Ford CSG-649, from the Ford service manual.
Applies to: Ford CSG-649
Procedure
- Install an auxiliary starter switch; crank the engine with the ignition switch OFF.
- Make two chalk marks on the crankshaft damper approximately 120 degrees apart.
- With No. 1 piston on TDC at end of compression stroke, tighten the rocker arm bolts of the No. 1 intake and exhaust valves.
- Supply pressure to bleed down the hydraulic tappet until the plunger is completely bottomed using Tool T70P-6513-A.
- Hold the tappet and check available clearance between the rocker arm and valve stem tip with a feeler gauge.
- If clearance is less than specification, install a shorter push rod.
- If clearance is greater than specification, install a longer push rod.
- Repeat for the remaining valves in firing order sequence 1-5-3-6-2-4, turning the crankshaft one-third turn at a time.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- A 1.52 mm (0.060 inch) shorter or longer push rod is available for service
- Collapsed tappet gap allowable 0.100-0.200 inch; desired 0.125-0.175 inch
Full service-parts list: Ford CSG-649 →
Source: Ford service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.