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Cat Catipillar Testing and Adjusting 3208 INDUSTRIAL Engine
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3208 DIESEL TRUCK ENGINE
2Z1-UP
SPECIFICATIONS (Section 11
SYSTEMS OPERATION (Section 21 -----------
TESTING AND ADJUSTING (Section 31
TROUBLESHOOTING GUIDE (Section 41
GENERAL INSTRUCTIONS (0 & AI (Section 51
DISASSEMBLY AND ASSEMBLY (Section 61
AIR COMPRESSORS (Section 71 ---------- -
RECONDITIONING PROCEDURES (Section 81

STANDARD TORQUE FOR METRIC FASTENERS
NOTE: Take care to avoid mIxing metric and inch dimensioned fasteners. Mis-
matched or Incorrect fasteners can result in vehicle damage or malfunction, or
possible injury. Exceptions to these torques are gi ven in the SeTyice Manual where
needed.
NOTE: P ri or to ins tallation of any hardware, be sure components are in near new
condition. Bolt and nut threads must not be worn or damaged. Hardware must be
free afrust and corrosion. Clean h ardware with a non-corrosive cleaner and app ly
cngine oil to threads and bea ring face. Iflhread lock or other compounds ar e to be
applied, do not app ly engine oil.
METRIC NUTS AND BOLTS
THREAD
SIZE
STANDARD TORQUE
(mm) (Nom) (Ib It)
M6 12 + 3 9+2
M8 28 ± 7 20 ± 5
M10 55 ± 10 40 ± 7
M12 100 + 20 75 + 15
M14 160 ± 30 120±22
M16 240 + 40 175 + 30
M20 460 ± 60
I
340 ± 44
M24 800 + 100 600 + 75
M30 1600 ± 200 1200±150
M36 2700 + 300 2000 + 225
METRIC TAPER LOCK STUDS
THREAD
SIZE
STANDARD TORQUE
(mm) (N om) (Ib It)
M6 8+3 6+2
M8 17 ± 5 13 ± 4
M10 35:t 5 26:t 4
M12 65 + 10 48+ 7
M16 110±20 80 ± 15
M20 170 + 30 125 + 22
M24 400 ± 60 300 ± 45
M30 650 + 80 480 + 60
M36 870 ± 100 640 ± 75
2

STANDARD TORQUE FOR INCH FASTENERS
Exceptions to these torques are given in the Service
Manua l where needed.
INCH NUTS AND BOLTS
THREAD
SIZE
STANDARD TORQUE
inch (N o m) (Ib II )
1/ 4 12 -+ 3 9+2
5/16 2S ± 6 18.0 ± 4 .5
3/8
47 + 9 35 + 7
7/16 70 -+ 15 50 + 11
1/ 2 105 -+ 20 75 -+ 15
9/16 160 + 30 120+20
5/8 215 ± 40 160±30
3/4 370 + 50 275 + 35
7/8 620 ± 80 460 ± 60
1 900 + 100 660 + 75
1-1 /8 1300 ± 150 950 ± 100
1-1/4 1800 + 200 1325 + 150
1-3/8 2400 + 300 1800 + 225
1-1 /2 3100 ± 350 2300 ± 250
INCH TAPERlOCK STUDS
THREAD
SIZE
5T ANDARO TORQUE
inch (Nom) lib II)
1/ 4 8±3 6±2
5/16 17 + 5 13 -+ 4
3/8 35 ± 5 26 ± 4
7/16 45 + 10 33 + 7
1/2 65 ± 10 48 + 7
5/8 110+20 80 + 15
3/4 170 + 30 125 + 22
7/8 260 + 40 190 + 30
1 400 + 60 300 + 45
1-1/8 500 ± 70 370 ± 50
1-1/4 650 + 80 480 + 60
1-3/8 750 ± 90 550 ± 65
1-1 /2 870 + 100 640 + 75
)

I O-RING FACE SEAL FITTINGS
O-RING FACE S EAl FITTING
O-R ING GROOVE
r-
.....
--II
-
~ STRAIGHT THREAD 0- """ POOT
-
O-RING FACE SEAL NUT
O -R ING FITTING END
STRAIGHT THREAD O-RING
FiniNG (FOR O-RING FACE
SEAL FiniNG ONLY)
THREAD
SIZE
STANDARD TORQUE
Inch (No m) (Ib II)
5/ 16 - 24 5.0 + 1.5 45 + lS lb in
3/8 - 24
12 + 2 110+201b in
7/16-20 20 + 4 15 + 3
1/2 - 20 30+ 5 22 + 4
9/16 - 18
40+ 5 30 + 4
3/4 - 16 100 + 15 75 + 10
7/8 - 14 135 + 15 100'+ 10
11 /1 6 - 12 200 + 25 150 + 20
13/1 6 - 12 250 + 25 185 + 20
15/16-12 300 + 40 22 5 + 30
15/ 8-12 300 + 40 225 + 30
17/8-12 300 + 40 225 + 30
21/2- 12 300 + 40 225 + 30
O-RING FACE SEAL FiniNG NUT
THREAD
SIZE
STANDARD TORQUE
inch (Nom) (Ib II)
9/16 - 18 16 + 3 12 + 2
11 /16 - 16 30 + 4 22 + 3
13/16 - 16 50 +7 37 + 5
1 - 14 90 + 10 65 + 7
13/16 - 12 120 + 15 90 + 10
17/16-12 160 + 20 120 + 15
111 /1 6 - 12 190 + 20 140 + 15
2 - 12 215 + 25 160 + 20
4

I FITTING INSTALLATION
HYDRAULIC LINE INSTALLATION
I. For a metal tube to hose insta ll ation. install the
tu be and lighten all bolts finger tight.
2. Tighten Ihe bolts al the rigid end.
3. In stall the hose and tighten all bolts finger tight.
4. Pullhc hose in a position so that it does not make
contact wi lh the mac hi ne or another hose.
5. Tighten the bolts on both connections.
6. Start the engi ne.
7. Move the implement co ntr ol levers to all
IXlsitions.
8. Look at the hose durin g movement of the imple-
me nt. Make s ur e hose is nol in contact with t he
machine or other hoses.
9. Shut off the engine.
10 . If necessary. put the hose in a new posit ion where
i! will not make co nt ac t when the implement is
moved.
ASSEMBLY OF FITIINGS WITH STRAIGHT
THREADS AND O-RING SEALS
T hi s type offit ting is used in many applications. The
tube end or the fitt ing will be di lTcrc nl in design so that
it can be used in many different app li calio ns. How·
ever, the installation proced ur e of the fitting is the
same. If the tube end o fl he fitting hody is Ihcsumc as
in t he illustration (either an elbow or a slraight body) il
will be necessary to assemble Ihe sleeve on Ihe luhe
before connecting the tube to the end.
3
--- 6
ELBOW BODY ASSSMBL Y
1. Endof fi ning body (connecl5lo tube ). 2. Fining body. 3. Lock ·
nut. 4. B8Ckup wuhet. 5. O-ring !Ie81. 6. End of fining 11181 goes
inlo other pl'Irt
5
I. Put locknut (3). backup washer (4) and O-ring seal
(5) as far back on fitting body (2) as possible. Holtl
these compo nents in this position. T urn the fitting
inlO Ihe par I it is used on until backup washer (4 )
ju st ma k es conta ct wi th the fuce of the part it IS
used on.
2. To putlhc fitting assembly in its correct position ,
turn Ihe fitting body (2) o ut (counterclockwise) a
maximum of 359°. Tighten l oc knut (3) to the
torque shown in the co rrect cha rt fo r the fitting
used.
NOTE : If the fitt ing is a connector (straight fitling),
the hc.~ on the body takes the place of the locknut. To
insta ll this type filling, ti gh t en the hex against Ihe faec
of the part it goes into.
TORQUES FOR FLARED AND O-RING FITIINGS
The torques shown in the charts that follow ar c to be
used on the nut pan of 37· Flared, 45" Flared and
Inv erted Flared fittings (when used with steellubing).
O-ring plugs, O·r ing fittings and swivel nuts when used
in app li cations to 3000 psi (20 700 kPa).
HOSE CLAMP - BAND TYPE
CLAMP TORQUE ON RETIGHTENING
WIDTH NEW HOSE TORQUE
7.9 mm 0.9 ± 0.2 N· m 0.7 ± 0.2 Nom
(.312 in) 8 ± 21b in 6 ± 2 Ib in
13.5 mm 4.5 ± 0.5 Nom 3.0 ± 0.5 Nom
(.53 1 in) 40±5 1bin 25±Slbin
15.9 mm 7.5 ± 0.5 N-m 4.5 ± 0.5 Nom
(.625 in) 65±51bin 40±51bin

37° FLARED AND STRAIGHT THREAD O-RING FITTINGS
88n ~~ m
O-RING
n° FLAREO FITTING - PLUG SWIVE L NUTS
37° FLARED AND STRAIGHT THREAD O-RING FITTINGS
(EXCEPT C-RING FACE SEAL FITTINGS)
THREAD
NOMINAL TUBE 0.0.
SIZE
STANDARD TORQUE
METRIC INCH inch
3.18 .125 5/16
4.76 .188 3/8
6.35 .250 7/16
7,94 .312 1/2
9.52 .375 9/16
9.52 .375 5/8
12.70 .500 3/4
15.88 .625 7/8
19.05 .750 1-1/16
22.22 875 1-3/16
25.40 1.000 1-5/16
31.75 1.250
38 .1 0 1.500
50.80 2.000
TIGHTENING OTHER FITTINGS
Hi Duty (Shear Sleeve) Tube Fittings
After tube has be en pu t t hr ough the nut and makes
contact against the tube shou lder in the fitting body,
turn the nut with a wrench until a small decrease In
torque is felt. This is an indication that the sleeve has
been broken off the nuL Ho ld the tube to prevent
turning and tighten the nut 1-112 turn s.
Hi Seal Finings
Put nut and sleeve over the tubing with the shan
heavy e nd of the sleeve facing the end of tubing. Put
the tube end against the countcrbore in the body of the
fitting and tighten until nut is over the last thread on
the body. The remainder of space is used whenev er the
fitting is removed and installed again.
1-5/8
1-7/8
2-1 /2
(N -m) (Ib tt)
5.0 ± 1.5 4±1
11.0 + 1.5 8 +1
16 ± 2 12 ± 1
20 ± 5 15 ± 4
25 + 5 18 + 4
35 ± 5 26 ± 4
50 + 7 37 + 5
55·:!: 7 48 ± 5
100 + 10 75 + 7
120 ± 10 90 ::!: 7
135 + 15 100+11
180 ± 15 135 + 11
225 ± 15 165 ± 11
320 + 30 240 + 22

45° FLARED AND 45° INVERTED FLARE FITTINGS
4S" FLARED
45° FLARED AND 45° INVERTED FLARE FITIINGS
THREAD
NOMINAL TUBE 0 .0 .
METR IC INCH
3. 18 .125
4.76 .188
6.35 .250
7.94 .312
9.52 .375
11 . 11 .438
12.70 .500
15.88 .625
19.05 .750
22.22 .875
TIGHTENING OTHER FITTINGS
Ermeto Tube Fi ttings
Put nut and slee ve over the lube with head or sho ul -
der end of sleeve next to nut. Push t ube into coun tCf-
bore offi lling body as far as possible. Turn nul clock-
wise until sleeve holds tube and prevents movement.
Tighten the nul 1-1 /4 turn s morc to seat sleeve and
give a locking act ion. When necessary to assemble
again, put sleeve over tube and tighten nut unt il a
sudd en in crease in torque is felt. Then tighten 1!6 to
113 turn morc to seat t he sleeve.
FJex FiHin gs
Put nut and slecve ovcr the tu bi ng and push tube
into cou nt crbo rc of filling body as far as possibl e.
Tighten the nut unt il it is against the hex part of the
filling body.
SIZE
indl
5/16
3/8
7/16
1/2
5/8
11/16
3/4
7/8
1-1 /16
1-1 /4
7
STANDARD TORQUE
( Nom) (Ib tt)
5.0 ± 1.5 4 + 1
B.O ± 1.5 6:!:1
11 + 2 8 + 1
17 ± 3 13 ± 2
30 + 3 22 + 2
30 ± 3 22 ± 2
38 + 4 28 + 3
50 + 5 37 + 4
90 :!: 8 65:!: 6
100 + 10 75+ 7

AIR CONDITIONING AND TAPERED PIPE THREAD FITTINGS
Q..R IIiG
AIR CONDITIONING FITTINGS
I
O-RING FITTING END 45" FLARE FiniNG END
STEEL TUBES ALUMINUM TUBES
THREAD
STANDARD TORQUE STANDARD TORQUE
SIZE
STANDARD TORQUE
Inch N·m ( Ib It) N·m (Ib It) N'm ~b It )
5/8 - 18 18 + 4 13 + 3 30 +3 22 + 2 23±3 17+ 2
3/4 - 16 37:!: 4 27::!: 3 52 ± 5 38 ±4 33±4 24 + 3
7/8 - 14 40 + 4 30 + 3 60 +7 44 + 5 38 + 4 28 + 3
11 /16-14 45 + 5 33 + 4 75 + 8 55 +6 50 + 5 37 + 4
TAPERED PIPE THREAD FITTINGS
STANDARD TORQUE
PIPE
THREADS WITH THREADS WI TH OUT
THREAD
SI ZE
1 E2 200E SEALANT SEALANT
inch N'm (Ib It) N'm (Ib It)
1/16- 27 15 11 20
15
1/8-27 20 15 25 18
1/ 4-18 25 18 35 26
3/8-18 35 26 45 33
1 /2- 14 45 33 60 45
3/4 -14 60 45 75 55
1-111 /2 75 55 90 65

Important Safety Information
Most accidents involving product operation , maintenance and repair are t;aused by fature to observe
baSIC safety rules or ptecautioos. An accident can often be avoided by recognizing I?9tenlially .
hazardous situations before an accident occurs. A person must be alert to potential hilzards. This
person should also have the necessary tr ai ning, skills and tools \0 perform t hese funclions proper1y .
Improper operation, lubrication, maintenance or repair of this product can beldangerous and
could result in injury or death.
Do not operate or perform any lubrication, maintenance or repair on this pr~uct. until you
have read and understood the operation, lubrication, maintenance and repai r! intonnation.
Safety precautions and warnings are provided in this manual and on the product . If th se hazard
warnings are not heeded, bodily inju ry or death could occur to you or othe r pe rsons.
The hazards are identified by the "Safety Alert Symbol" and fotlowed by a "Sign al Warp' such as
"WARNING" as shown below.
A WARNING
The meani ng of this safety alert symbol IS as fOllows:
Attention! Become Alert! Your Safety is Involved.
The message that appears under the warnIng, explalnlrlg the hazard, can be either w~lIen or pictorially
presented
Operations that may cause product damage are identified by NOTI CE labels on the P{oduct and in this
publication.
Caterpillar cannot anticIpate every possibte CIrcumstance thai mIght invotve a potenti hazard. The
warn I ngs in this publication and on the product are theref ore not all inclusive. If a tool, procedure, work
method or operating technique not specifically recommended by Caterpillar is used, must satisfy
yourself that it is safe for you and others. You should also ensure thai the product will not be damaged
or made unsafe by the operation, lubrication, maintenance or repair procedures you oose.
The Information, specifications, and illustrations in this publication are on the basis 01 formation
available al the time it was written. The specificatIOns. torques, pressures, measure nts, adjustments,
illustrations, and other items can change at any time. These changes can affect the s Nice given to
the product. Obt ain the complete and most currentrnformation before starting any iO~. Caterpillar
deal ers have the most current information available. For a list of the most current publIcation form
numbers available, see the Service Ma nual Contents Microfiche, REG! 1 39F.

A WARNING
SAFETY
A WARNING
Improper performance of lubrication or mainte-
nance procedures is dangerous and could result
in injury or death. Read and understand the lu-
brication and maintenance procedures, recom-
mended by Caterpillar, that are outlined in the
OPERA nON MAINTENANCE GUIDE and/ or OW-
NER'S MANUAL for this product before perform-
ing any lubrication or maintenance.
Do not operate this product unless you have
read and understood the instructions. Improper
operation is dangerous and could result in injury
or death.
The serviceman or mechanic may be unfamiliar
with many of the components and systems of this
product. This makes it important to use caution when
performing service work. A knowledge of the system
andl or components is importa nt before the removal or
disassembly of any component.
Because of the size of some components, the service-
man or mechanic should check the weights noted in
this Manual. Use proper lifting procedures when re-
moving any components.
'Following is a list of basic precautions that should
always be observed.
1. Read and understand all Warning plates and de-
cals before operating, lubricating or repairing this
product.
2. Make sure the work area around the product is
made safe and be aware of hazardous conditions
that may exist.
3. Always wear protective glasses and protective
shoes when working. In particular, wear protec-
ti ve glasses when a hammer or sledge is used for
pounding to make repairs. Use welders gloves,
hood/goggles, apron and other protective clothing
appropriate to the welding job being performed.
Do not wear loose-fitting or torn clothing. Re-
move all rings from fingers when working on
machinery.
10
4. If an engine must be started to make pressure or
speed checks, be sure all guards and shields are
installed. To help prevent an accident caused by
parts in rotation, work carefully around machin-
ery that has been put into operation.
S. If an engine has been running and the coolant is
hot, loosen the fillercapslowly and let the pressure
out of the cooling system, before a.ny caps, plugs or
lines are removed or disconnected.
6. Corrosion inhibitor contains alkali. Avoid contact
with eyes. Avoid prolonged or repeated contact
with skin. Do not take internally. In case of con-
tact, immediately wash skin with soap and water.
For eyes, nu sh with large amounts of water for at
least I S minutes. CALL PHYSICIAN. KEEP
OUT OF REACH OF CHILDREN .
7. Do not smoke when an inspection of the battery
electrolyte level is made. Never disconnect any
charging unit circuit or battery circuit cable from
the battery when the charging unit is operating. A
spark can cause an explosion from the flammable
vapor mixture of hydrogen and oxygen that is re-
leased from the electrolyte through the battery out-
lets. Do not let electrolyte solution make contact
with skin or eyes. Electrolyte solution is an acid. In
case of contact. immediately wash skin with soap
2nd water. For eyes, flush with large amounts of
water for at least 15 minutes. CALL PHYSICIAN .
KEEP OUT OF REACH OF CHILDREN.
8. Disconnect battery and discharge any capacitors
before starting any repair work. Hang "'Do Not
Operate" tag in the Operator's compartment or on
the controls.
9. Do not work on anything that is supported only by
lift jacks or a hoist. Always use blocks or proper
stands to support the product before performing
any service work.
10. Relieve all pressure in air, o il or water systems
before any lines, fittings or related items are dis-
connected or removed. Be alert for possible pres-
sure when disconnecting any device from a system
that utilizes pressure. Do not check for pressure
l eaks with your hand. High pressure oil or fuel can
pierce the skin.
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Get the comprehensive manual for the Cat Caterpillar Testing and Adjusting 3208 Industrial Engine. This manual is designed for both professional mechanics and DIY enthusiasts. It provides detailed information on the testing and adjustment procedures for the 3208 Industrial Engine 03Z10093-UP model. Whether you're maintaining, repairing, or troubleshooting, this manual is an essential tool for ensuring the optimal performance of your 3208 Industrial Engine.