Chevrolet 1980 Light Duty Truck Service Manual page 481

ENGINE LEFT ENGINE FRONT
" S M A L L
" A " O IL R IN G SPACER G A P
(T ang in H o le o r S lo t w ith in A rc )
B " OIL R IN G RAIL G A P S
"C 2 N D C O M P R E S S IO N R IN G G A P
D " T O P C O M P R E S S IO N R IN G G A P
F i g . 6 A 4 - 5 6 ~ R i n g G a p L o c a t i o n
d. Flex the oil ring assembly to make sure ring is free.
If binding occurs at any point the cause should be
determined. If binding is caused by ring groove, correct by
dressing groove with a fine cut file. If binding is caused by
a distorted ring, check a new ring.
e. Install second compression ring (manufacturer mark
up) with gaps properly located.
f. Install top compression ring (manufacturer mark up)
with gap properly located.
9. Proper clearance of the piston ring in its piston ring
Fig. 6 A 4 -5 7 ~ M e a s u rin g Ring Groove Clearance
ENGINE RIGHT
V 8 " " M A R K I V V 8 '
Fi g. 6 A 4 - 5 8 - - l n s t a l l i n g C o n n e c t i n g R o d & P i s t o n A s s e m b l y
groove is very important to provide proper ring action and
reduce wear. Therefore, when fitting new rings, the
clearances between the surfaces of the ring and groove
should be measured (fig. 6A4-57). (See Specifications).
Installation
Cylinder bores must be clean before piston installation.
This may be accomplished with a hot water and detergent
wash or with a light honing as necessary. After cleaning,
the bores should be swabbed several times with light engine
oil and a clean dry cloth.
1. Lubricate connecting rod bearings and install in
rods and rod caps.
2. Lightly coat pistons, rings and cylinder walls with
light engine oil.
3. With bearing caps removed, install Tool J-5239 (3 /
8") on connecting rod bolts.
4. Install each connecting rod and piston assembly in
its respective bore. Install with connecting rod bearing tang
slots on side opposite camshaft. Use Tool J-8037 to
compress the rings (fig. 6A4-58). Guide the connecting rod
into place on the crankshaft journal with Tool J-5239 (3/8")
Use a hammer handle and light blows to install the piston
into the bore. Hold the ring compressor firmly against the
cylinder block until all piston rings have entered the
cylinder bore.
5. Remove Tool J-5239.
6. Install the bearing caps and torque nuts to
specifications.
Be sure to install new pistons in the cylinders for which
they were fitted, and used pistons in the cylinder from which
they were removed. Each connecting rod and bearing cap
should be marked, beginning at the front of the engine.
Cylinders 1,3,5 and 7 are the left bank and, 2 4, 6 and 8 are
the right bank. The numbers on the connecting rod and
bearing cap must be on the same side when installed in the
cylinder bore. If a connecting rod is ever transposed from
one block or cylinder to another, new bearings should be
fitted and the connecting rod should be numbered to
correspond with the new cylinder number.
SMALL BLOCK 6 A 4-29
LIG H T TR U C K S ER V ICE M ANUAL