Ford CSG-649 — Compression Test
Testing & diagnosis · engine
For the Ford CSG-649, from the Ford service manual.
Applies to: Ford CSG-649
Procedure
- Run engine at 1200 rpm 30 minutes to normal temperature.
- Turn ignition off; remove all spark plugs.
- Set carburetor throttle plates wide open.
- Install compression gauge in No. 1 cylinder.
- Crank engine at least five pumping strokes; record highest reading.
- Repeat on each cylinder using same stroke count.
- If low, squirt one tablespoon oil and retest.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Normal compression pressures are within 75% of the highest cylinder
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.