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| Eagle Engine >> MAIN BEARING SADDLE REPAIR KITS
Main Bearing Saddle Repair Kits
The Cummins Engine Company has made main bearing saddle repair kits available for several engines. These kits can be used to salvage cylinder blocks when a main bearing has spun and the main bearing saddle has been damaged.
Each kit contains an 1/8 drill bit, two hold down bolts (one for the lock ring and one for the other side of the saddle), a quantity of rivets and the appropriate number of repair sleeves. Semi-finished or good used main bearing caps are also needed to complete the repair.
A main bearing saddle can be successfully repaired by following this procedure.
Remove the main bearing cap from the saddle to be repaired. Using the appropriate align bore tooling remove .050 of material out of the saddle. This will enlarge the main bearing bore by .100.
Clean the saddle and lock tang area. Install the repair sleeve and align the lock tang slot of the sleeve with the one in the block.
From the repair kit, install the washer marked L on the lock tang side of the saddle. Install the second washer on the opposite side. Install the hold down screws and torque to 20 lbs.ft. (Figure 1).
Mount the 1/8 drill bit in a right angle drill, so that the drill extends 1/4 beyond the chuck jaws.
Using the 4 holes in the repair sleeve as a guide, drill through each of the holes into the saddle. The proper hole depth is achieved when the chuck jaws contact the repair sleeve.
Clean the 4 holes and install the supplied rivets (Figure 2). Peen the rivets until they are flush with the repair sleeve.
Remove the temporary hold down bolts and trim the ends of the repair sleeve so they are flush with the main bearing saddle.
Clean the main bearing bolt holes and install a good used or semi-finished main bearing cap. Torque the main bearing bolts to specifications.
Using the appropriate align boring tools, refinish the main bearing housing bore to specifications. Approximately .050 of material should be removed from the repair sleeve.
Main bearing bore repair kits or sleeves may also be available from several aftermarket sources.
The AERA Technical Committee
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