Ford CSG-850 / WSG-858 — Timing Chain Deflection Check
Testing & diagnosis · Timing chain and sprockets
For the Ford CSG-850 / WSG-858, from the Ford service manual.
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Procedure
- Rotate crankshaft counterclockwise (viewed from front) to take up slack on left side.
- Establish a reference point on the block and measure from it to the chain.
- Rotate crankshaft opposite direction to take up slack on the right side of chain.
- Force left side of chain out with fingers and measure the distance.
- The deflection is the difference between the two measurements.
- If deflection exceeds specifications, replace the timing chain and sprockets.
Tools required
- Ruler/scale Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Timing chain deflection maximum 0.500 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.