chevrolet truck Light Duty Truck 1994 Series Repair Manual Download

Page: 339 / 919

Method “B”

1. Clean and install the bearing inserts, and

crankshaft into block.

2. Place a piece of gaging plastic across the

entire

bearing width.

3. Seat the bearing cap carefully by tapping it lightly

with a suitable tool.

NOTICE:

In order to prevent the possibility of

cylinder  block  and/or  main  bearing  cap  damage,
the  main  bearing  caps  are  to  be  tapped  into  their
cylinder  block  cavity  using  a  brass  or  leather

mallet before  attaching  bolts  are  installed.  Do  not
use  attaching  bolts  to  pull  main  bearing  caps  into
their  seats.  Failure  to  observe  this  information
may  damage  a  cylinder  block  or  bearing  cap.

• Connecting rod nuts to 52 N*m (38 lbs. ft.).
• Main bearing cup bolts to 95 N*m (70 lbs. ft.).

m Important

• Do not

rotate the crankshaft.

4. Remove the bearing cap, leaving the gaging

plastic in place. It does

not

matter whether the

gaging  plastic  adheres  to  the  journal  or  to  the
bearing  cap.
Measure  the  flattened  gaging  plastic  at  its

widest

point

with the scale printed on the gaging plastic

package. Refer to Figure 29.

• If clearance obtained meets specification, the

bearing size used for measurement is correct.

• If clearance obtained does not meet the

specification,  choose  a  service  bearing  that
will  correct  the  clearance  and  meet  the
specification.  If  the  proper  bearings  are
unavailable,  the  crankshaft  must  be  replaced.

NOTICE:

Bearing inserts must not be shimmed,

scraped or filed.  Do  not  touch  the  bearing  surface
of  the  insert  with  the  bare  fingers.  Skin  oil  and
acids  will  each  the  bearing  surface.

6. Remove all traces of the gaging plastic after

measuring.

|-»4-| Install or Connect

|~y| Important

• Make sure the bearing cap bolt holes and the

cap mating surfaces are clean and dry.

1. Dip bearing cap bolts in clean engine oil.

2. Lubricate the bearing surface with engine oil

supplement, GM P/N 1052368 or equivalent.

3. Crankshaft or connecting rod.

NOTICE:

Avoid damage to the crankshaft

journal. Use connecting rod stud protectors or

guide pins.

4. Bearing cap. Tap gently into place with a brass or

leather mallet.

NOTICE:

In order to prevent the possibility of

cylinder block and/or main bearing cap damage,

the  main  bearing  caps  are  to  be  tapped  into  their
cylinder  block  cavity  using  a  brass  or  leather
mallet before  attaching  bolts  are  installed.  Do  not

use attaching bolts to pull main bearing caps into

their seats. Failure to observe this information
may damage a cylinder block or bearing cap.

Tighten

• Connecting rod nuts to 52 N*m (38 lbs. ft.).
• Main bearing- cap bolts to 95 N*m (70 lbs. ft.).

5. Seat the crankshaft thrust bearing, by forcing

crankshaft  fully  rearward  to  align  all  bearing
caps,  then  force  the  crankshaft  fully  forward  to
align  the  rear  thrust  bearing  surfaces.  Refer  to
Figure  30.

chevrolet truck Light Duty Truck 1994 Series, Repair Manual

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