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SECTION : 9N
FRAME AND UNDERBODY
TABLE OF CONTENTS
SPECIFICATIONS 9N1. . . . . . . . . . . . . . . . . . . . . . . . . .
Fastener Tightening Specifications 9N1. . . . . . . . . . .
Underbody Dimensions(Three and Five Door HatchBack) 9N1. . . . . . . .
Underbody Dimensions (NotchBack) 9N3. . . . . . . . .
MAINTENANCE AND REPAIR 9N5. . . . . . . . . . . . . . .
ONVEHICLE SERVICE 9N5. . . . . . . . . . . . . . . . . . . . .
Alignment Checking 9N5. . . . . . . . . . . . . . . . . . . . . . . .
Floor Pan Insulators 9N5. . . . . . . . . . . . . . . . . . . . . . . .
Engine Under Covers 9N6. . . . . . . . . . . . . . . . . . . . . .
GENERAL DESCRIPTION AND SYSTEMOPERATION 9N7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Body Construction 9N7. . . . . . . . . . . . . . . . .
Engine Under Covers 9N7. . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Application Nm LbFt LbIn
Engine Under Cover Bolts 3.5 31
Engine Under Cover Nuts 3.5 31
UNDERBODY DIMENSIONS(THREE AND FIVE DOOR HATCHBACK)
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9N 2IFRAME AND UNDERBODY
DAEWOO V121 BL4
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FRAME AND UNDERBODY 9N 3
DAEWOO V121 BL4
UNDERBODY DIMENSIONS (NOTCHBACK)
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9N 4IFRAME AND UNDERBODY
DAEWOO V121 BL4
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FRAME AND UNDERBODY 9N 5
DAEWOO V121 BL4
MAINTENANCE AND REPAIR
ONVEHICLE SERVICE
ALIGNMENT CHECKINGAn accurate method of determining the alignment of the
underbody uses a measuring tram gauge. The tram gaugeset used to perform the recommended measuring checksmust include a vertical pointer able to reach 457 mm (18inches).
Two types of measurements can be made with a tram
gauge: direct pointtopoint measurements and mea-surements calculated on a horizontal plane (datum line)parallel to the underbody. Pointtopoint measurementsare generally taken on steering and suspension enginecompartment parts and simply require the vertical pointers
to be set equally.
For horizontal plane measurements, the vertical pointers
must be set as specified for each point to be measured.Dimensionstogauge holes are measured to the centerof the holes and flush to the adjacent surface metal unlessotherwise specified. It is recommended that the diagonal
dimensions to the crossbody be checked on both sidesin order to verify the dimensional accuracy of the vehicleunderbody.
FLOOR PAN INSULATORS
The floor pan insulators have been designed for the higherfloor pan temperatures that result from the use of the cata-lytic converter in the exhaust system. Therefore, when
servicing a vehicle, it is essential that any insulators thatmay have been disturbed or removed be reinstalled in theoriginal sequence and location. Also, an insulator needsto be replaced, use only the insulation specified for thatlocation on the floor pan.
When servicing or replacing interior insulators, observethe following instructions.
Install the insulators in the original position and se-quence. Butt the pieces together in order to avoidgapping or overlapping.
If it is necessary to replace an insulator, use onlythe specified insulation.
Use the original part to determine the amount ofreplacement material required and as a template forcutting and fitting the new piece to the floor pan.
When installing the insulator, do not enlarge anycutouts or holes that are used for the attachment ofinterior parts such as the instrument panel or thefloor console.
Route the crossbody harness for interior partsover the floor pan insulators. Clip it in the originallocation.
Do not apply sprayon deadeners or trim adhesivesto the top of the floor pan at the area directly overthe catalytic converter or the muffler.
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9N 6IFRAME AND UNDERBODY
DAEWOO V121 BL4
Any insulator service repair or replacement should be thesame thickness, size, and location as the original installa-tion in the vehicle.
ENGINE UNDER COVERS
Removal Procedure1. Raise and suitably support the vehicle.2. Remove the front wheel. Refer to Section 2E, Tires
and Wheels.
3. Remove the nuts and the bolts and the engine un-der cover.
Installation Procedure1. Install the engine under cover with the bolts and
nuts.
TightenTighten the engine under cover bolts to 3.5 Nm (31lbin).
Tighten the engine under cover nuts to 3.5 Nm (31lbin).
2. Install the front wheel. Refer to Section 2E, Tiresand Wheels.
3. Lower the vehicle.
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FRAME AND UNDERBODY 9N 7
DAEWOO V121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
GENERAL BODY CONSTRUCTION
This vehicle is constructed with a unitized body which in-
corporates integral front and rear frame side rails.
The front suspension lower control arms are bolted to andretained by supports, one each on the right and left sides.The front suspension lower control arm supports are at-tached to the underbody with three bolts at two locations.The engine is bolted to the integral front side rails. Thesuspension strut towers must be dimensionally correct inrelation to the remainder of the underbody in order to main-tain specified suspension strut and caster/ camber angles.
Since the individual underbody parts contribute directly tothe overall strength of the body, it is essential to observeproper welding techniques during service repair opera-
tions. The underbody parts should be properly sealed andrustproofed whenever body repair operations destroy ordamage the original sealing and rustproofing. When rust-proofing critical underbody parts, use a goodquality typeof airdry primer, such as a corrosionresistant chromate
or an equivalent material. Combination type primer/sur-
facers are not recommended.
ENGINE UNDER COVERSThe engine under covers are molded pieces of plastic that
serve as shields for the underside of the engine. The cov-ers help protect the engine from small rocks, gravel andother objects that would otherwise come into contact withthe engine during normal driving conditions.