Ford LSG 875 — Fitting Main or Connecting Rod Bearings with Plastigage
Adjustments · Crankshaft main and connecting rod bearings
For the Ford LSG 875, from the Ford service manual.
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Procedure
- Clean crankshaft journals; inspect journals and thrust faces for nicks, burrs, bearing pickup.
- 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 crankshaft while Plastigage is in place.
- Remove cap; using Plastigage scale, check width at widest point for minimum clearance.
- Difference between widest and narrowest readings is taper of journals.
- If clearance exceeds limits, try a 0.002 inch undersize bearing in combination with standard bearings.
- Remove Plastigage, apply light coat of engine oil, install bearing cap, torque bolts to specifications.
Tools required
- Plastigage Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Connecting rod nut torque 55-61 N·m (40-45 ft-lb)
- Main bearing cap bolt torque 129-142 N·m (95-105 KuduParts $58.00 ft-lb)
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.