Chevrolet 70 1969 Series, Shop Manual

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SECTION 6C
6 V - 5 3 DIESEL ENGINE
Contents of this section are listed in index below:
Subject Page No.
Engine Maintenance and Tune-up . . . . . . . . . 6C-1
In-Vehicle Service Operations . . . . . . . . . . 6C-4
Trouble Diagnosis C h a r t .......................................... 6C-11
ENGINE MAINTENANCE AND TUNE-UP
GENERAL INFORMATION
General engine maintenance includes servic­
ing engine accessories and components to assure
satisfactory, economical performance at all times.
Refer to applicable maintenance paragraphs in this
manual for servicing air cleaners and fuel filters.
In addition to service described, the engine should
be precisely tuned at regular intervals, following
the procedure given later under "Engine Tune-Up
Operations."
ENGINE MAINTENANCE
SERVICING AIR C L E A N E R S
Engine air cleaners are oil bath type. Follow
the procedure given in LU BR ICATION (SEC. 0) in
this manual to maintain air cleaners in service­
able condition.
W ARNING
USE E X T R E M E C A U T IO N T O BE
SURE T H A T A L L V O L A T I L E C L E A N ­
ING F L U ID (GASOLINE , K E R O S E N E ,
E T C .) IS R E M O V E D F R O M AIR C L E A N ­
E R A T T IM E O F C L E A N IN G . U N C O N ­
T R O L L E D F U E L E N T E R IN G T H E
C O M BU STIO N C H A M B E R IN THIS M A N ­
N E R C A N C A U SE T H E EN GIN E T O
"R U N A W A Y " A N D POSSIBLY D E S ­
T R O Y IT S E L F A N D CA U SE INJURY
T O P E R S O N N E L .
E N G IN E OIL F IL T E R E L E M E N T
Oil filter element changing periods are related
to crankcase oil changing periods, the quality of oil
used and severity of service. To replace element,
proceed as follows:
1. Remove drain plug and loosen bolt which
holds filter shell on base. Allow oil to drain out of
filter.
2. Remove shell and element as an assembly
by removing bolt which is threaded into filter base.
3. Withdraw element from shell and discard
element. Clean shell assembly and remove gasket
from base at engine.
4. Install new element in shell, place new gas­
ket at filter base on engine, then install shell and
element assembly. Tighten shell retaining bolt to
40 to 50 foot-pounds. Install and tighten drain plug.
5. Fill crankcase with recommended oil.
6. Start engine and check for oil leaks at shell
gasket and retaining bolt. Run engine long enough
to assure complete filling of filter with oil, then
stop engine and add oil to engine crankcase to
bring oil level to the " F . " mark on dipstick.
N O T E : Recommendations for oil change per­
iods, oil specifications, and viscosity are contained
in LUBR ICATION (SEC. 0) in this manual.
C R A N K C A S E OIL L E V E L A N D
VISCOSITY O BSER VATION
An oil level dipstick at left side of engine is
provided for checking crankcase oil level. Dipstick
is marked " L " and " F . "
Daily, or oftener if necessary, check crank­
case oil level. Make oil level check preferably
after a days' run and after engine has been stopped
for at least five minutes. Remove dipstick, wipe
clean with cloth, reinsert dipstick, then remove
again. Oil level should be maintained between " L . "
(Low) and " F . " (Full) marks without overfilling. Do
not operate with level below " L . " mark. Add oil
whenever the oil level reaches or falls below the
" L . " mark.
When checking engine oil level, make note of
oil viscosity. If there is evidence of crankcase oil
dilution as indicated by oil appearing too "thin" or
by level above the " F , " mark on dipstick, make
necessary investigation to determine cause of di­
lution and make necessary corrections.
D R IV E BELTS
Inspect all drive belts for evidence of worn or
frayed condition as well as for other damage. R e­
place belts if worn. N O T E : Belts used in pairs
must be replaced as a matched pair even though
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SHO P M ANUAL