Series - Chevrolet 40 Series 1972 Service Manual

OIL COOLER, LINES,
AND BY-PASS SYSTEM
IMPORTANT: The v e h icle's radiator not only
co o ls the engine coolant, but also cools the trans­
m issio n o il. It is im perative that the coolant be at
the proper lev e l at all tim es, otherw ise insufficient
heat dissipation from tra n sm ission oil w ill result.
An oil cooler located in the radiator, through
which tran sm ission oil is circulated before return­
ing to the oil pan, d issip a tes heat createdby normal
operation of the torque converter and tran sm ission .
If a tra n sm issio n failu re occu rs which ca u ses for­
eign m atter to be carried into the oil co oler, the
co oler and all connecting lin es should be thorough­
ly cleaned by flushing before tra n sm issio n is put
back into operation.
FLUSHING OIL COOLER AND LINES
It is important that following tra n sm ission
m alfunctions, the tra n sm issio n oil cooler be prop­
erly flushed sin ce foreign p a rticle s lodged in the
co oler eventually becom e free and can cause a r e ­
peated tran sm ission failu re. If the oil cooler and
lin e s are properly flushed, the p o ssib ility of these
troubles reoccurring after the tra n sm ission has
been repaired is elim inated or substantially r e ­
duced.
The Spicer 6041 and 7041 A uxiliary T ran sm is­
sio n s have new mountings for this year as shown in
figure 2. A uxiliary tran sm issio n replacem ent
procedures are described as follows:
AUXILIARY TRANSMISSION
REPLACEMENT
REMOVAL
1. Drain lubricant from auxiliary tr a n sm is­
sion .
2. D isconnect p rop eller shafts from input and
output ends of tra n sm issio n . R efer to "PROPEL­
LER SHAFTS" (SEC. 4D) in this supplem ent.
NOTE: Support p rop eller shafts secu rely to
prevent damage from dropping.
3. D isconnect shift control rods from th efron t
of the tra n sm issio n .
4. D isconnect speedom eter cable from adap­
ter at rear of the tra n sm issio n .
5. D isconnect parking brake linkage (when
used).
6. Rem ove a ll connections to the auxiliary
tra n sm issio n power tak e-off (when used).
SECTION 7C
A u x j l i a / u f .
AUXILIARY TRANSMISSIONS
W henever an internal difficulty occu rs in the
tran sm ission which would resu lt in clutch plate
m aterial or m etal p a r tic le s
throughout the oil sy stem , the oil cooler should be
thoroughly flushed as outlined in the follow ing text,
then an auxiliary filte r in stalled in the cooler r e ­
turn line before the veh icle is returned to serv ice:
1. D isconnect both o il cooler lin es at the fit­
tings at sid e of tra n sm issio n ca se, or if an au xil­
iary filter has been p reviou sly in stalled , d iscon ­
nect cooler return line at filte r instead of at the
tra n sm issio n . (Change auxiliary filter elem ent.)
2. B ack-flush the o il co o ler and lin e s using
clean solvent and co m p ressed air.
CA U TIO N : DO NOT exceed 100 psi
a ir pressure.
3. R em ove all rem aining
from the sy ste m with com p ressed air.
4. Flush the cooling sy stem again with DEX-
RON® tra n sm issio n fluid. A fter the final flush,
test the oil cooler for fre e flow of oil, and if the
flow is re stricted , the radiator bottom tank and
cooler assem b ly must be replaced.
7. P osition a suitable dolly or jack under the
tran sm ission and adjust to safely carry the weight
of the tra n sm ission .
8. Rem ove attaching parts
AUXILIARY TRANSMISSION
Figure J —Front M ount In sta lle d
Sec. 7C
Page 49
being distributed
cleaning solvent
from auxiliary
T-6113