Engine International VT365. Manual — part 17

ELECTRONICALLY CONTROLLED VARIABLE GEOMETRY

TURBOCHARGER (VGT)

65

Cleaning and Inspection

VGT Assembly

WARNING: To prevent personal injury or

death, wear safety glasses with side shields to
protect eyes. Limit compressed air pressure to
207 kPa (30 psi).

NOTE: Do not use a caustic solution on the VGT and
related components.

Clean the VGT assembly and bracket with a suitable
solvent and nylon brush. Dry with filtered compressed
air.

Related Components

1.

Rinse out inside of oil supply tube, if removed from
the oil filter base.

2.

Clean VGT mounting bracket, exhaust piping, and
oil drain pipe.

Inspection

NOTE: Replace VGT if blades are bent.

Do not

straighten bent wheel blades.

1.

Inspect the compressor impeller and turbine
wheel for blade erosion, bending, breakage or
deposits. Replace VGT if damaged.

NOTE: Compressor impeller and turbine wheel
deposits can be caused by the following:

•

High air inlet restriction allows oil to transfer from
the VGT center housing, resulting in oil deposits.

•

Excessive oil consumption can result in turbine
wheel carbon deposits.

•

Engine

over

fueling

can

cause

excessive

operating temperatures, which can melt aluminum
parts.

Deposits on the turbine wheel indicate

failure.

•

Oil from crankcase breather (mounted on top of
the left valve cover).

Oil from the breather is

normal for this engine.

2.

Inspect the turbine and compressor housings for
wheel rubbing. Replace the VGT if wheels rub.

3.

Inspect oil drain and supply lines for kinking,
clogging, restrictions, and deterioration. Discard
both sets of O-rings.

66

ELECTRONICALLY CONTROLLED VARIABLE GEOMETRY

TURBOCHARGER (VGT)

Check Free Rotation and Housing Rub

1.

Put VGT on a bench with the shaft in a horizontal
position.

Figure 63

Free rotation of VGT shaft

2.

Turn VGT shaft by hand; the shaft must spin
freely. Contact with the turbine and compressor
housings is not acceptable.

Check Axial End Play

1.

With VGT in a stable position, push the impeller
shaft toward the turbine housing as far as it will

go. Put tip of dial indicator (Table 6) on end of
the compressor side of the shaft and zero the
indicator.

Figure 64 Axial end play

1.

Dial indicator with magnetic base

2.

Compressor housing

2.

Move shaft back toward the dial indicator.

3.

If measurement exceeds specifications, (Table 4)
replace VGT.

ELECTRONICALLY CONTROLLED VARIABLE GEOMETRY

TURBOCHARGER (VGT)

67

Installation

Variable Geometry Turbocharger (VGT) and
Components

Figure 65

VGT bracket

1.

Place VGT bracket in engine valley by putting right
side of bracket under EGR cooler coolant inlet
tube. Then lower left side over bolt holes.

Figure 66 VGT bracket bolts

2.

Install four M8 x 20 mounting bolts to secure
VGT bracket to crankcase. Tighten bolts to the
standard torque (Standard Torques, page 375).

Figure 67

Lubrication for O-rings on oil drain

tube for VGT

3.

Install two new oil drain tube O-rings and lubricate
both O-rings with clean engine oil.

4.

Remove cap and install drain tube in the
high-pressure oil pump cover.

NOTE: If not immediately installing the VGT, install a
cover over the oil drain tube.

Figure 68 VGT alignment dowels and bosses

1.

Alignment dowel

2.

Alignment boss

68

ELECTRONICALLY CONTROLLED VARIABLE GEOMETRY

TURBOCHARGER (VGT)

5.

Use alignment dowels to position VGT on bosses
of forward and middle mounting brackets.

6.

Remove the oil drain tube cap (if it was installed)
and lower VGT on mounting brackets and on oil
drain tube.

7.

Coat bolt threads for three M8 x 30 flange head
bolts with anti-seize compound and secure VGT
to mounting bracket.

8.

Tighten bolts to the special torque (Table 5).

Figure 69

Exhaust adapter V-clamp for VGT

9.

Remove the exhaust outlet cover, install exhaust
piping, and tighten VGT exhaust adapter V-clamp
to the special torque (Table 5).

10. Remove cover on oil supply port on the oil cooler

cover assembly.

11. Install and lubricate a new O-ring on oil supply

tube.

Figure 70 Oil supply tube for VGT to oil cooler
cover assembly

1.

Oil supply tube

2.

Mounting bolt

12. Install VGT oil supply tube in oil supply line port in

the oil cooler cover assembly.

13. Install and tighten the M8 x 20 flange head bolt.

Torque the oil supply tube bolt to the standard
torque (Standard Torques, page 375).

Figure 71 Prelubrication of VGT bearings

CAUTION: To prevent engine damage, prelubricate
VGT bearings when installing the VGT.