Piston And Connecting Rod Assembly - Mazda MX-5 1990 Workshop Manual

RUBBER SLEEVE
05U08X-192
05UOBX-194
05UOBX-195
05UOBX-196
ASSEMBLY
Piston and Connecting Rod Assembly
Caution
B
• Protect the connecting rod bolts with rubber sleeves
to prevent damage to the crankpin journals.
1. Apply a liberal amount of clean engine oil to the cylinder
walls, pistons, and piston rings.
2. Check the piston rings for correct end gap alignment.
3. Insert each piston assembly into the cylinder block with the
F mark facing the front of the engine. Use a piston ring com-
pressor (commercially available).
Connecting Rod Cap
1. Measure the connecting rod bearing oil clearances using
the same procedure as for the main bearing oil clearance.
Caution
• Align the matching marks on the cap and the con-
necting rod when installing the connecting rod cap.
Tightening torque:
50-54 N·m (5.1-5.5 m-kg, 37-40 ft-Ib)
Oil clearance: 0.028-0.068mm (0.0011-0.0027 in)
Maximum: 0.10mm (0.004 in)
2. If the oil clearance exceeds the maximum, grind the crank-
shaft and use undersize bearings. (Refer to page
8-58.)
3. Measure the connecting rod side clearances.
Side clearance: 0.11 0-0.262mm (0.0043-0.0103 in)
Maximum: 0.30mm (0.012 in)
4. If the clearance exceeds the maximum, replace the con-
necting rod and cap.
8-65