CYLINDER BLOCK — Halfshell Selection and Connecting Rod Bearing (Supplement-V)
EM-5040prose procedureHalfshell selection chart NEM299 is a 26×26 letter-pair lookup (crankshaft × cylinder block); reproduced as a narrative reference rather than a 676-cell keyed table — the on-page worked example carries the operative information. HALFSHELL TYPE STANDARD table preserves the slight inconsistency in the source where the type-B finish is labelled 'Groove' (singular) while A/C show 'Grooved'.
Inspection (Cont'd)
Use the chart (NEM299) and HALFSHELL TYPE STANDARD table to select the correct main bearing halfshell type from the crankshaft and cylinder block letter codes.
HALFSHELL TYPE STANDARD
Halfshell type standard — main bearing
Finish / color
Halfshells for cylinder block sideSmooth (black) Grooved (black)
Halfshells for bearing cap side — ASmooth (blue) Grooved (blue)
Halfshells for bearing cap side — BSmooth (black) Groove (black)
Halfshells for bearing cap side — CSmooth (green) Grooved (green)
TYPE
Halfshells for cylinder block sideB
Halfshells for bearing cap side — AA
Halfshells for bearing cap side — BB
Halfshells for bearing cap side — CC
THICKNESS
Halfshells for cylinder block side1.858 (0.0731)
Halfshells for bearing cap side — A1.844 (0.0726)
Halfshells for bearing cap side — B1.858 (0.0731)
Halfshells for bearing cap side — C1.869 (0.0736)
NOTE
For example: The first letter on the crankshaft is S and the first letter on the cylinder block is E then according to the tables the main bearing cap halfshell for bearing No. 1 will be type A (blue). The cylinder block halfshell will always be B (black).
Connecting rod bearing (Big end)
Connecting rod bearing (Big end) — clearance
- 1Install connecting rod bearing to connecting rod and cap.
SEM153B - 2Install connecting rod cap to connecting rod.Tighten bolts to the specified torque.
- 3Measure inner diameter of each bearing.