User Manual

Page 6-14
200 ENGINE ASSEMBLY
[219 RV] PISTON COOLING
SPRAY NOZZLE
Description
Refer to Figure 6-14.
The piston cooling system consists of an oil
pump, oil passages drilled in the cylinder block,
and an oil spray-nozzle assembly for each piston.
The piston cooling nozzles are attached to the
main oil gallery. Oil is discharged through the
nozzles and into the underside of each piston.
This spray provides additional piston cooling. The
oil returns, by gravity, to the crankcase oil pan.
Inside the crankcase at each cylinder is a drilled
oil passage from the main oil gallery and one
threaded hole for the retaining screw.
Beginning with 1991 E7 engine production, piston
cooling nozzle hardware and nozzle spray
positioning tool changes have been made. The
two-piece piston design uses two types of
cooling. A unique splash and forced piston
cooling system first appeared on the 1991 E7
engine. Precise targeting of the piston cooling
spray provides adequate cooling to the piston
crown and fills the four oil reservoirs located in
the top of the piston skirt.
The piston cooling nozzle bracket is thicker on
the piston cooling nozzles beginning on 1991 E7
production engines. Also, “310” is etched on the
pre-1991 piston cooling nozzle, and “316” began
in 1991 E7 production. These parts are not
interchangeable with 1989/1990 production.
Figure 6-14 — Spray Nozzle Comparison
Special Tools Required
앫 Piston Cooling Nozzle Spray Position Set
J 37721-A (for 1989/1990 production)
앫 Two-Piece Piston Cooling Nozzle Aimer
J 39045 (for 1991 and later production)
Installation
Refer to Figure 6-15.
1. Using a liberal amount of lubricant, install
elastomer sleeve (7) on locator tube (6).
2. Install a retaining screw (4) in the spray
nozzle bracket (3).
3. Position spray nozzle locator tube (6) in
cylinder block oil passage (2) and torque
retaining screw to 15 lb-ft (20 N폷m) using
torque wrench J 24406 or equivalent.
Figure 6-15 — Spray Nozzle Installation
200278a
1989/1990
E7 PRODUCTION
BEGINNING IN 1991,
E7 PRODUCTION
1. Threaded hole
2. Oil passage
3. Spray nozzle bracket
4. Retaining screw
5. Cylinder block
6. Locator tube
7. Elastomer sleeve
200280a
1
3
2
4
5
6
7
5-101.bk Page 14 Friday, March 17, 2006 11:05 AM