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Hummer H1 (2002+). Manual - part 98

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Wheels and Tires/Central Tire Inflation System (CTIS) 6-7

05745159

Figure 6-11: Runflat Compressor Positioning

NOTE:

Compress runflat by rotating the handle in a clockwise

direction. Rotate handle counterclockwise to loosen.

Using runflat compressor, compress runflat.

Stand tire up and lubricate tire bead and runflat with tire
lube (Figure 6-12).

Figure 6-12: Runflat Insertion

NOTE:

It may be necessary to remove the handle assembly on

runflat compressor before inserting runflat into tire.

NOTE:

Ensure shorter flange of runflat faces inner rim side of

tire (Figure 6-13).

Insert runflat compressor side first as far as possible into
tire.

Lay tire flat on side. Slowly loosen compressor. Runflat
should position itself inside tire. If not, repeat steps 4
through 6 and/or use a tire spoon to assist in installation.

NOTE:

If required, clean and lubricate bearing assembly on

runflat compressor after removal.

Remove runflat compressor from tire.

Figure 6-13: Runflat Positioning

Lubricate O-ring seal with tire lube and install O-ring seal
on first ledge of inner rim half. Ensure O-ring seal is not
twisted and is uniformly positioned in the groove outside
of the studs. Do not overstretch O-ring seal (Figure 6-14).

Lubricate tire bead and rim bead seat areas with tire lube.

STRAP

HANDLE

RUNFLAT

COMPRESSOR

CRANK

RUNFLAT COMPRESSOR

TIRE

RUNFLAT

TIRE

BEAD

RUNFLAT

TIRE

SHORTER

RUNFLAT

FLANGE

LONGER

FLANGE

6-8

Wheels and Tires/Central Tire Inflation System (CTIS)

_________________

NOTE:

Before installing tire on inner rim half, inspect tire

sidewalls for a “paint dot.” Paint dots are often used to indicate
the tire’s light spot for balancing purposes. If paint dot is
present, position tire on rim halves so that paint dot is aligned
with insert hole on outer rim half.

NOTE:

The Wrangler GS-A, 37 X 12.50R16.5 LTD touring

radial tire has a directional tire tread. The heavier, stiffer tread
on the outside shoulder of tire must face outward when being
installed. Before installing, inspect sidewall of tire and ensure
SIDE FACING OUTWARDS imprint is facing outward
(Figure 6-11).

10. Center runflat in tire. Carefully lower tire over inner rim

half. Check to ensure O-ring seal has not been disturbed
(Figure 6-14).

CAUTION:

Ensure the runflat is properly aligned with the

valve stem in the wheel. Improper alignment can result in non-
uniform bead pressure and improper runflat operation.

11. Ensure runflat is not binding on flat portion of inner rim

half. Runflat should clear inner rim half.

12. Install valve core in core housing.

NOTE:

Perform the following step only if core housing and

insert were removed.

13. Install O-ring into groove on insert. Install insert into

valve hole of outer rim half with locknut. Tighten locknut
to 40-60 lb-in (5-7 N•m). Apply thread-locking compound
to core housing and thread valve bore into insert. Tighten
core housing to 25-30 lb-ft (34-41 N•m).

Figure 6-14: Two-Piece Wheel with One-Piece Runflat Breakdown

00-S06-009

O-RING SEAL

STUDS

INNER RIM HALF

TIRE

VALVE CORE

BEAD

INSERT

LOCKNUT

OUTER RIM

HALF

O-RING

CORE

HOUSING

ALIGNMENT

HOLE

WHEEL HALF

LOCKNUT

RUNFLAT

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Wheels and Tires/Central Tire Inflation System (CTIS) 6-9

05745159

CAUTION:

Tighten locknuts gradually to avoid bending and/

or breaking studs, or damage to wheel components.

NOTE:

If vehicle is equipped with central tire inflation sys-

tem, position shield mounting bracket on outer rim.

15. Line up alignment holes in both wheel halves and secure

outer rim half on inner rim half with twelve locknuts.

NOTE:

If tire bead does not seat on the rim flange after infla-

tion, deflate tire completely and remove from rim. Check to en-
sure that a 16.5 inch diameter tire is being used. Also check for
bent or damaged components and replace if necessary. Lubri-
cate tire bead and rim mating surfaces and reinstall tire on rim.

NOTE:

Never tighten locknuts when tire is in an inflated con-

dition. This will result in less accurate torque. Tighten locknuts
to proper torque specifications every 3,000 miles (4800 km).

16. Preliminarily tighten locknuts to 85 lb-ft (115 N•m) in

tightening sequence shown (Figure 6-15).

Figure 6-15: Locknut Tightening Sequence

17. Retighten locknuts to 125 lb-ft (170 N•m) in sequence

shown.

18. Check wheel assembly for gaps at each stud. Use a 0.0015

inch (0.038 mm) thickness gauge to detect gaps. If gaps
are detected, disassemble and reassemble wheel assembly
and recheck for gaps. If gaps are still detected, replace
inner rim half (Figure 6-16).

19. Install wheel half locknut covers.

Figure 6-16: Checking Wheel Stud Gap

WARNING: Never inflate a tire without having
checked wheel half locknut torques to ensure the wheel
locknuts are tightened to specifications. A wheel with
improperly tightened locknuts could separate under
pressure, resulting in serious injury or death. Always
use a tire inflation cage for inflation purposes. Stand on
one side of cage during inflation, never directly in front.
Keep hands out of the cage during inflation. Inflate tire
to recommended pressure using a clip-on air chuck. Do
not exceed 50 psi (345 kPa) cold inflation pressure.
Failure to follow these instructions may result in seri-
ous injury or death.

20. Place wheel in safety cage and inflate tire to recommended

tire pressure.

21. Check for leaks around rim edges, insert, and core housing

with soapy solution (Figure 6-17).

S06-103.1

THICKNESS

GAUGE

STUD

INNER

RIM HALF

6-10

Wheels and Tires/Central Tire Inflation System (CTIS)

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Figure 6-17: Leak Check Areas

WHEEL HALF STUD REPLACEMENT

Removal

Remove wheel from vehicle.

Place wheel in tire inflation cage.

WARNING: Ensure the tire is totally deflated before
removing wheel locknuts. Failure to follow proper
safety precautions may result in serious injury or death.

Remove valve core from valve bore and deflate tire. Run a
wire through valve bore to ensure it is not plugged
(Figure 6-18).

Figure 6-18: Valve Core and Valve Bore

NOTE:

When replacing broken rim stud(s), replace studs on

both sides of broken stud(s).

When tire is fully deflated, loosen wheel locknuts on each
side of the broken stud(s). If you hear escaping air, do not
proceed. Wait until the sound stops and recheck valve
bore. When you are certain tire is fully deflated, proceed
to remove wheel locknut. Discard locknut.

Drive studs out of inner rim. Discard studs (Figure 6-19).

Cleaning and Inspection

Using wire brush, clean remaining studs. Clean all dirt and
foreign material from rim with soap and water and allow
to air dry.

WARNING: Never use wheel assemblies with studs
that are damaged, loose, or have damaged threads.
Damaged studs can cause improper assembly, which
could cause individual fasteners to fail. Any of these sit-
uations may result in serious injury or death.

RIM

EDGE

CORE HOUSING

INSERT

TIRE

WHEEL

LOCKNUT

VALVE CORE

VALVE

BORE

Content .. 96 97 98 99 ..