Installation; Hydraulic Lash Adjusters; Diagnosis And Testing - Hydraulic; Lash Adjuster Noise Diagnosis - Dodge Intrepid Service Manual

LH
VALVE STEM SEALS (Continued)

INSTALLATION

(1) The valve stem seal/valve spring seat should be
pushed firmly and squarely over the valve guide
using the valve stem as guide. Do Not Force seal
against top of guide.
(2) Install valve spring. (Refer to 9 - ENGINE/
CYLINDER HEAD/VALVE SPRINGS - INSTALLA-
TION)
POSSIBLE CAUSES
1. Engine oil level—too high or too low. This may cause
aerated oil to enter the adjusters and cause them to be
spongy.
2. Insufficient running time after rebuilding cylinder
head.
3. Air trapped in lash adjuster (after 1 hour run time).
4. Low oil pressure
5. Oil passage to cylinder head(s) plugged with debris.
6. Worn valve guide(s).
7. Air injested into oil due to broken or cracked oil
pump pickup tube.
8. Collapsed lash adjuster due to debris injestion.
LASH ADJUSTER (TAPPET) NOISE CHART
HYDRAULIC LASH
ADJUSTERS
DIAGNOSIS AND TESTING - HYDRAULIC LASH
ADJUSTER NOISE DIAGNOSIS
Proper noise diagnosis is essential in locating the
source of a NVH complaint. Locating a lash adjuster
(tappet) type noise can sometimes be difficult. As a
result, an initial misdiagnosis may occur.
Refer to LASH ADJUSTER (TAPPET) NOISE
CHART indicating possible lash adjuster (tappet)
noise sources and possible sources that could lead to
a misdiagnosis.
Refer to LASH ADJUSTER (TAPPET) NOISE
CHART for possible causes and correction of a lash
adjuster (tappet) type noise.
CORRECTION
1. Check and correct engine oil level.
2. Low speed running of up to 1 hour may be required
to fully evacuate trapped air from the valve train
system. During this time, turn engine off and let set for
a few minutes before restarting. Repeat this several
times after engine has reached normal operating
temperature.
3. See below:
(a) Check lash adjusters for sponginess while installed
in cylinder head. Depress part of rocker arm over
adjuster. Normal adjusters should feel very firm. Very
spongy adjusters can be bottomed out easily.
(b) If lash adjuster(s) are still spongy, replace with new
adjuster/rocker arm assembly.
4. See below:
(a) Check and correct engine oil level.
(b) Check engine oil pressure.
(c) Check for excessive bearing clearance and correct.
(d) Check for worn oil pump.
5. Check cylinder head oil passages and cylinder head
gasket restrictor for blockage. Clean or replace as
necessary.
6. Ream guide(s) and replace valve(s) with oversize
valves and seal(s).
7. Inspect pickup tube and replace as necessary.
8. Clean debris from engine and replace lash
adjuster(s).
ENGINE 2.7L 9 - 37