We remove and install the crankshaft during engine overhaul.

Removing the crankshaft

Remove the main bearing caps.

Снятие и установка коленчатого вала Cummins ISF3.8

a) Check for timing marks on the main bearing caps and cylinder block.

Cover numbers start at the front of the engine.

b) Remove the main bearing cap bolts, but do not remove them.

Снятие и установка коленвала

c) Using the 2 bolts as a lever, swing the main bearing cap and remove it.

Do not damage the threads of the bolts.

Снятие и установка коленчатого вала Cummins ISF3.8Снятие и установка коленчатого вала Cummins ISF3.8

We apply marks on the removed parts in accordance with their location

Remove the crankshaft

Remove the upper main bearing shells.

Снятие и установка коленчатого вала Cummins ISF3.8

Apply a relative position mark to the removed liner

Checking the crankshaft

Measure the diameter of the crankshaft connecting rod and main journals.

Снятие и установка коленчатого вала Cummins ISF3.8

Connecting rod journal diameter:

- nominal 68.962 - 69.013 mm;

- rem. (0.25 mm) 68.712 - 68.763 mm;

- rem. (0.50 mm) 68.462 - 68.513 mm.

Main journal diameter:

- nominal 82.962 - 83.013 mm;

- rem. (0.25 mm) 82.712 - 82.763 mm;

- rem. (0.50 mm) 82.462 - 82.513 mm.

Maximum ovality 0.050 mm

Maximum taper 0.013 mm

If the dimensions of one neck differ from the nominal size, bore all the necks to the nearest repair size.

Determine the main bearing clearance with a plastic gauge.

a) Place the crankshaft in the cylinder block.

Снятие и установка коленчатого вала Cummins ISF3.8

b) Place a plastic gauge across each root journal.

c) Install the main bearing caps.

d) Tighten the main bearing cap bolts.

Note: do not turn the crankshaft.

e) Remove the crankshaft main bearing caps.

Снятие и установка коленчатого вала Cummins ISF3.8

f) Measure the maximum width of the flattened gauge by determining the value of the radial clearance.

Main bearing clearance 0.04 - 0.12 mm

Снятие и установка коленчатого вала Cummins ISF3.8

Check the length of the main bearing cap bolt rod length.

Maximum length 120 mm

Снятие и установка коленчатого вала Cummins ISF3.8

Check the thickness of the main bearing shells.

Liner thickness:

- nominal 2.456 - 2.464 mm;

- rem. (0.25mm) 2.706-2.714mm;

- rem. (0.50 mm) 2.956-2.964 mm.

Снятие и установка коленчатого вала Cummins ISF3.8

If necessary, select a new bearing using the number stamped on the back of the old liner.

Installing the crankshaft

Снятие и установка коленчатого вала Cummins ISF3.8Снятие и установка коленчатого вала Cummins ISF3.8

Install the main bearing shells by aligning the shell projections with the grooves in the main bearing seats.

Install the crankshaft thrust bearing shell on the # 4 main bearing.

Снятие и установка коленчатого вала Cummins ISF3.8

Apply assembly grease (# З163О87) to the running surfaces of the main bearings and the crankshaft end thrust bearing.

Снятие и установка коленчатого вала Cummins ISF3.8

Make sure the guide bushings are in the main bearing caps.

Install the crankshaft.

Снятие и установка коленчатого вала Cummins ISF3.8

Install the main bearing shells aligning the tabs of the shells with the grooves of the main bearing caps

Apply assembly grease (# 3163087) to the running surfaces of the main bearings and the crankshaft end thrust bearing. Do not apply grease to the back of the liner!

Make sure there is no dirt or debris on the surfaces of the main bearing caps between the cap and the cylinder block.

Install the main bearing caps according to the numbers on the removal.

Align the guide bushings on the main bearing cap with the corresponding holes in the cylinder block.

Снятие и установка коленчатого вала Cummins ISF3.8

Note: Make sure the covers are properly installed where they were removed from, numbered towards the engine oil cooler.

Снятие и установка коленчатого вала Cummins ISF3.8

Numbering starts at the front of the engine.

Lubricate the threads and under the bolt heads with engine oil.

Снятие и установка коленчатого вала Cummins ISF3.8

Install the main bearing cap by tapping it gently with a plastic hammer.

After reinstalling the cover, tighten the bolts.

Tightening torque 50 Nm

Снятие и установка коленчатого вала Cummins ISF3.8

Tighten the bolts evenly in the sequence shown in figure 20. Perform each step on all bolts before moving on to the next step.

Torque:

Used bolts:

- first stage 60 Nm;

- second stage 80 Nm;

- turn the third stage 90 °.

New bolts:

- the first stage 120 Nm;

- the second stage completely loosen the bolts;

- third stage 60 Nm;

- fourth stage 85 Nm;

- turn the fifth stage by 120 °.

Make sure the crankshaft turns freely.

Снятие и установка коленчатого вала Cummins ISF3.8

Using a dial gauge, check the axial movement of the crankshaft.

Axial travel 0.11 - 0.39 mm

If the axial clearance is greater than the maximum value, replace the thrust bearing of the main bearing, which is installed in the area of the main journal 4.

There are repair sizes of thrust bushings 0.25 mm and 0.50 mm.