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TURBO HYDRA-MATIC 400 AUTOMATIC TRANSMISSION
7A4-5
FIG. 7A4-5 OIL PRESSURE GAGE INSTALLED
Engines Without EGR Valve Or If High Line
Pressures Were Obtained With The EGR
Vacuum Line Plugged
If high line pressures are experienced on vehicles without
EGR or with EGR line plugged, it may be that the engine
is not producing enough vacuum to lower transmission line
pressure within specifications. The newer engines with
emission controls characteristically have lower engine
vacuum than older past model engines. To obtain line
pressures suitable for evaluation, it is recommended that
vacuum be applied to the modulator, using an external
vacuum source such as Kent-Moore J 23738 hand operated
vacuum device or its equivalent. The unit allows definite
amounts of vacuum to be applied to the modeulator so that
consistent line pressures may be obtained for evaluation as
follows:
1.
Disconnect the vacuum hose to the modulator at the
modulator and plug the vacuum hose.
2. Attach the hand operated vacuum device as shown
in Fig. 7A4-6 and apply 20" of vacuum.
3. Recheck line pressures according to the Preliminary
Checking Procedure Chart (Fig. 7A4-4).
4. If line pressures are still high, proceed to the specific
diagnosis chart that applies to the malfunction encountered.
5.
If line pressures are normal with external vacuum
applied, check engine vacuum and vacuum systems for leaks
(See
"CAUSES
OF
IMPROPER
VACUUM
AT
MODULATOR").
USING THE HAND OPERATED VACUUM
DEVICE (Fig. 7A4-6)
When using the hand operated vacuum device to provide
a consistent vacuum for line pressure checks and/or when
checking a modulator, apply 20" of vacuum. The vacuum
should not bleed down any for at least 30 seconds. If a bleed
down occurs, a vacuum leak is indicated.
NOTE: Before using this vacuum device each time,
check it for leaks. Hold a finger firmly against the end
of the hose and apply 20" of vacuum. Vacuum must not
drop any for at least 30 seconds. Also, make sure the
hose that fits over the modulator pipe is very tight.
3819
Fig. 7A4-6 Vacuum Device Installed
CHECKING TRANSMISSION OIL LEVEL
1. ENGINE RUNNING.
2. VEHICLE ON LEVEL SURFACE.
3. BRAKES APPLIED.
4. MOVE LEVER THROUGH ALL RANGES.
5.
PLACE TRANSMISSION IN "PARK".
6. CHECK OIL LEVEL.
7. I F OIL IS LOW, CHECK FOR POSSIBLE CAUSES
-
REFER TO "CAUSES O F OIL LEAKS".
The oil level should be between the "ADD" and "FULL
HOT" marks at normal operating temperature (1 80-200°F).
This temperature is obtained after at least 15 miles of
expressway driving or equivalent city driving. Also, at normal
operating temperature, the oil will heat the gage end of the
dip stick to a degree where the average person can not grasp
it firmly with his bare hand without discomfort.
With the oil at room temperature (approx. 70"F), the oil
level should be between the two dimples located below the
" A D D mark. If the oil level is correctly established at room
temperature, (70"F.), it should be at the "FULL HOT" mark
on the dip stick when the transmission reaches normal
operating temperature (180-200°F).
MAINTAIN OIL LEVEL BETWEEN THE "ADD"
AND
"FULL
HOT"
MARKS
AT
NORMAL
OPERATING TEMPERATURE.
CAUTION:
DO
NOT
OVERFILL
TRANSMISSION AS THIS WILL CA USE
FOAMING A N D LOSS OF OIL THROUGH
THE VENT PIPE.
MANUAL LINKAGE ADJUSTMENT
The transmission manual linkage must be adjusted so
that the pointer on the indicator quadrant and linkage detents
or stops correspond with the transmission inside detent lever
detents. If the linkage is not adjusted properly, an internal
leak could occur at the manual valve which could cause a
clutch and/or front band to slip. Refer to the Manual Linkage
Adjustment Procedure.
NOTE: I F A MANUAL LINKAGE ADJUSTMENT
IS MADE, THE ASSOCIATED NEUTRAL SAFETY
SWITCH
SHOULD
BE
ADJUSTED,
I F
NECESSARY. THE NEUTRAL SAFETY SWITCH
SHOULD BE ADJUSTED SO THAT THE ENGINE
WILL START IN "PARK" AND "NEUTRAL"
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