Ford CSG-850 / WSG-858 — Fitting Main or Connecting Rod Bearings with Plastigage
Repair & overhaul · Main and connecting rod bearings
For the Ford CSG-850 / WSG-858, from the Ford service manual.
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Procedure
- Clean crankshaft journals; inspect journals and thrust faces for nicks, burrs or pickup.
- Support crankshaft with a jack under the counterweight adjoining the bearing checked.
- Place a piece of Plastigage across full width of bearing cap, about 1/4 inch off center.
- Install cap and torque bolts to specifications; do not turn the crankshaft.
- Remove cap; measure Plastigage width at widest and narrowest points.
- If clearance exceeds limits, try a 0.002 inch undersize bearing with standard bearing.
- After fitting, remove Plastigage, apply light oil, install cap and torque to specifications.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fitting standard bearings to minimum specified clearance is good practice
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.