Note: Loss of camshaft bearing fit is mainly determined by changes in the geometry of the bearing seats in the cylinder block.
Before removing the bearing, check the reliability of the bearing fit in the cylinder block. If necessary, carry out the necessary repairs to the block.
The bearing beds of the camshaft in the cylinder block are made with three different diameters.
Bearing beds No.1 and No.5 have the maximum diameter, bearing bed No.3 has the minimum diameter, and bearing beds No.2 and No.4 have an intermediate diameter.
The outer diameter of the bearing shells is made accordingly. At the same time, the inner diameter of the shells is the same size for all bearings.
To replace bearings, a special puller kit is used.
The puller kit includes a guide cone (1), guide washers (2) and (3), mandrels (4-8), rods (9) and (10), grips (11), bushing (12), expansion cone (13), shaft (14) and expansion support (15).
1. Select a mandrel of the appropriate size and the corresponding drive washer.
2. Install the mandrel on the expansion support.
Caution: When installing or removing the mandrel, pull or push the mandrel by the ends. Pressure on the outside diameter may cause the rubber bushing to bend.
3. Align the dividing lines of the mandrel segments with the dividing lines of the support.
4. Install the guide cone on the small diameter rod to the mandrel.
5. Install the drive washer over the threaded portion of the expansion support.
6. Screw the support with the drive washer into the rod. Both rods of the set may be required for removing and installing the inner bearings.
7. Insert the drift into the inner camshaft bearing and tighten the support nut by hand. Install the puller from the front or rear end of the cylinder block, depending on the bearing number. On some engine blocks, the support nut may not be accessible. In this case, you need to use a socket wrench and extension, installed from the opposite end of the block.
8. Slide the guide cone (2) into the front or rear camshaft bearing to ensure the puller is centered.
9. Remove or install the bearing.
10. Repeat the procedure for the remaining inner bearings.
11. No guide cone is required to remove or install the front and rear bearings.