Skylark L4-138 2.3L DOHC VIN D MFI (1988)
1.
Remove timing chain housing from engine compartment and remove front oil gallery plug. Refer to Service Manual.
2.
Insert a narrow magnet with flexible handle into the front oil gallery. Push the magnet to the end of the gallery. If magnet contacts ball check, ball
can be removed.
Procedure C
1.
Drain oil and remove oil pan. Refer to Service Manual.
2.
With timing chain housing and front oil gallery plug removed, insert magnet into gallery approximately 1 inch to position magnet over Number 1
bearing oil feed passage.
3.
Remove Number 1 main bearing cap.
4.
Rotate crankshaft so the oil feed hole in Number 1 main journal is approximately at the 4:00 o'clock position as viewed from the front (crankshaft
snout end) of the engine.
IMPORTANT:
Placing the crankshaft main journal oil feed hole at the 4:00 O'clock position allows the journal hole to line up with the oil hole in the upper bearing.
5.
Verify that the oil feed hole in the crankshaft journal is lined up with the hole in the upper bearing by inserting a small plastic straw thru the
crankshaft journal and bearing oil feed hole.
NOTICE:
Do not use a metal tool to align the crankshaft journal and upper bearing hole or bearing damage could result.
IMPORTANT:
When the crankshaft journal and upper bearing oil holes are aligned, the ball check (if in the main bearing oil feed passage) may be visible when looking
through the crankshaft journal hole.
6.
With a rubber tipped air gun, blow compressed air through Number I crankshaft main bearing journal oil feed hole to force ball to magnet.
If ball cannot be located, repeat procedure C, steps 3 through 6 at the other crankshaft main journals in sequence of 5, 4, 3, 2 until the ball is
recovered.
Parts and Warranty Information
PARTS INFORMATION
Parts required to perform the repair described in this bulletin are listed below. Parts are currently available through GMSPO.
DESCRIPTION
PART NUMBER
Oil Flow Check Valve
22548701
Gasket Kit, Cylinder Head
22535452
WARRANTY INFORMATION
Labor Operation Number:
J0509
Labor Time:
6.9 hrs
Add:
A - Remove Ball from Top of Block
.1
B - Remove Ball from Front Oil Gallery Plug
.3
C - Remove Ball from #1 Crankshaft Oil Passage
.8
D - Remove Ball from #5 Crankshaft Oil Passage
.3
E
- Remove Ball from #4 Crankshaft Oil Passage
.3
F
- Remove Ball from #3 Crankshaft Oil Passage
.2
G - Remove Ball from #2 Crankshaft Oil Passage
.2
H - To clean parts on vehicles over 30,000 miles
if necessary
.4