How To Measure Subaru EJ Engine Cylinders
This procedure is taken from the Subaru service manual and will be used as a reference only. We always recommend that a Subaru specialist carries out work.
1) Visually check for cracks and damage. Especially, inspect the important parts by means of red lead check.
2) Check the oil passages for clogging.
3) Inspect the crankcase surface that mates with cylinder head for warping by using a straight edge, and correct by grinding if necessary.
Warping limit: 0.05 mm (0.0020 in)
Grinding limit: 0.1 mm (0.004 in)
Standard height of cylinder block: 201.0 mm (7.91 in)
- CYLINDER AND PISTON
1) The cylinder bore size is stamped on cylinder block’s front upper surface.
NOTE:
Measurement should be performed at a temperature of 20°C (68°F).
Standard sized pistons are classified into two grades, “A” and “B”. These grades should be used as a guide line in selecting a standard piston.
Grade A: 92.005 — 92.015 mm (3.6222 — 3.6226 in)
Grade B: 91.995 — 92.005 mm (3.6218 — 3.6222 in)
2) How to measure the inner diameter of each cylinder:
Measure the inner diameter of each cylinder in both the thrust and piston pin directions at the heights shown in the figure, using a cylinder bore gauge.
NOTE:
Measurement should be performed at a temperature of 20°C (68°F).
Taper:
Standard 0.015 mm (0.0006 in)
Limit 0.050 mm (0.0020 in)
Out-of-roundness:
Standard 0.010 mm (0.0004 in)
Limit 0.050 mm (0.0020 in)
