Piston - Clearance/Oversize Specifications
90isuzu01BULLETIN NUMBER SB89-01-012
ISSUE DATE December 21, 1989
GROUP ENGINE
I-MARK (JT) PISTON CLEARANCE / OVERSIZE PISTON SPECIFICATIONS (WORKSHOP MANUAL CORRECTION)
VEHICLES AFFECTED
1985-1989 I-Mark (JT) models with 4XC1 engine.
SERVICE INFORMATION
Tbe piston clearance and oversize piston specificafions for 4XC1 engine are incorrectly specified in the following Workshop Manuals:
Manual Page No.
1988/1989 I-Mark (JT) 01A-38
(Publication No. AIMI-SVC-168, part No. 2-90989-002-0)
1988 I-Mark (JT) 01-38
(Publication No. AIMI-SVC-160, part No. 2-90988-002-0)
1987 I-Mark (JT) (turbo and NA) 01A-30
(Publication No. AIMI-SVC-152, part No. 2-90999-107-8)
1987 I-Mark (JT) (NA only) 01-30
(Publication No. AIMI-SVC-145, part No. 2-90999-107-7)
1986 I-Mark (JT) 01-30
(Publication No. AIMI-SVC-128, part No. 2-90999-107-6)
1985 I-Mark (JT) 01-30
(Publication No. AIMI-SVC-118, part No. 2-90999-107-5)
This Service Bulletin contains the correct piston clearance and oversize piston specifications for 4XC1 engine.
Measure the cylinder bore inside diameter (refer to "Inspection of the Cylinder Block" in this Section) If the clearance is not within to the specified value, the pistons must be replaced and the cylinders rebored.
Clearance mm(in.) 0.03 - 0.05 (0.0012 - 0.0020)
Select oversize piston Oversize pistons are available as listed. Replace the pistons in matched sets. Take the largest bore measured and select the oversize piston for the bore. Bore all cylinders for the oversized piston selected. mm(in.)
Oversize 0.50 77.445 - 77.465
(3.0490 - 3.0498)
NA
Oversize 1.00 77.945 - 77.965
(3.0687 - 3.0695)
Oversize 0.50 77.460 - 77.470
(3.0496 - 3.0500)
TURBO
Oversize 1.00 77.960 - 77.970
(3.0693 - 3.0697)