Info

No.

Description

Qty.

Installing

1

Connecting rod nut

8

Replace, tighten to specified torque. Lubricate threads and bearing surface

2

Connecting rod cap

4

Pay attention to pair numbers

3

Lower bearing shell half

4

Always renew worn bearing shells

4

Circlip

8

Pry out

Position correctly

5

Piston pin

4

6

Piston

4

Give light coat of oil; position correctly; note tolerance group

7

Piston ring Groove 1 Tapered face

4

8

Piston ring Groove 2 Tapered face scraper ring

4

9

Oil scraper ring Groove 3

8

10

Spring Groove 3

4

First install spring; after installing oil scraper rings check whether end gaps of springs are offset

No,

Description

Qty.

Instal1ing

11

Upper conrod bearing shell half

4

Always renew worn bearing shells

12

Connecting rod with conrod bolts

4

13

Upper crankcase section

1

Check cylinder bores after mounting lower crankcase section and tightening bolts to specified torque

PISTON SURVEY

13 - 34 Disassembling and Assembling Pistons and Connecting Rods

INSTALLING PISTON AND CONNECTING ROD

Connecting Rod

The material of connecting rods was changed since February, 1984. This did not change the weight. New and old connecting rods can be installed together in one engine.

Sintered connecting rod, Part No. 944 103 001 00 (rough part number on inside of conrod shaft).

Cast connecting rod, Part No. 944 103 001 01 (rough part number reduced on both sides on conrod base and conrod cap).

Connecting Rod Nuts

The bearing surface of conrod nuts was also changed due to the connecting rod material change.

Smooth bearing surface, Part No. 928 103 172 01.

Ribbed bearing surface, Part No. 928 103 172 02.

After depletion of stocks, only the new version (ribbed bearing surface) conrod nuts will be available.

Note

The old (smooth) conrod nuts must never be used with the new cast connecting rods.

It is recommended to use the new connecting rod nuts each time the engine is repaired. Tightening torque: 75 Nm.

The tightening torque of 57 + 5 Nm is still applicable to smooth connecting rod nuts used together with sintered steel connecting rods.

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