Mazda MX-3 silhouetteMX-3

Assembly

B2-94prose procedure

Connecting Rod Cap

Measure the connecting rod bearing oil clearances as follows

  1. 1
    Measure the oil clearance with the connecting rod in BDC position.
  2. 2
    Do not rotate the crankshaft when measuring the oil clearances.
  3. 3
    Position Plastigage atop the journals in the axial direction.
    Line drawing of the crankshaft journal area with Plastigage placed atop the journal in the axial direction. PLASTIGAGE callout points to the strip.
  4. 4
    Remove any foreign material and oil from the lower connecting rod bearing and connecting rod cap.
  5. 5
    Install the lower connecting rod bearing to the cap.
  6. 6
    Measure the length of connecting rod cap bolt. Replace it if the length exceeds the maximum.
    Line drawing of a connecting rod cap bolt with its length dimension marked: 46.7-47.3mm {1.84-1.86 in}.
  7. 7
    Apply clean engine oil to the threads and seat faces of the connecting rod cap bolts.
  8. 8
    Install the connecting rod caps.
  9. 9
    Tighten the connecting rod cap bolts.
  10. 10
    Put a paint mark on each bolt head.
  11. 11
    Using this mark as a reference, tighten the bolts 83°-97°.
    Line drawing of the connecting rod cap with two bolts, each marked with the angular tightening range 83-97 degrees. PAINT MARKS callout points to the bolt head paint marks.
  12. 12
    Remove the connecting rod caps.
  13. 13
    Measure the Plastigage at each journal at the widest point for the smallest clearance, and the narrowest point for the largest clearance.
    Line drawing of measuring the Plastigage width against the printed scale to determine oil clearance, with a hand holding the Plastigage scale next to the journal.
  14. 14
    If the oil clearance exceeds the maximum, grind the crankshaft and install undersize bearings. (Refer to page B2-84.)
Lengthconnecting rod cap bolt
46.7-47.3mm {1.84-1.86 in}
Maximumconnecting rod cap bolt length
48.0mm {1.89 in}
connecting rod cap bolts
22.1 - 26.9N·m
Oil clearanceconnecting rod bearing
0.023-0.43mm {0.0009-0.0016 in}
Maximumoil clearance
0.08mm {0.003 in}

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