Ford CSG-850 / WSG-858 — Camshaft Lobe Lift Check
Testing & diagnosis · Camshaft lobes
For the Ford CSG-850 / WSG-858, from the Ford service manual.
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Procedure
- Remove the air cleaner and the valve rocker arm cover.
- Remove rocker arm assembly; install a solid tappet-type push rod or ball-end adapter.
- Install dial indicator in push rod socket, in the same plane as push rod movement.
- Crank engine with ignition OFF until lifter is on base circle; zero the indicator.
- Rotate crankshaft slowly until push rod is fully raised; record total lift.
- Compare with specification; replace camshaft and lifters if below wear limits.
- Remove dial indicator; install rocker arm assembly, cover and air cleaner.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Maximum allowable lobe lift loss 0.005 inch
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.