Group 22
Service procedures - intake and exhaust systems
113
Checking exhaust back
pressure
Special tools: 884969 (flange kit) TWD1620/-1630, TID162
885184 (flange kit) TAD1630/-1631
1
Remove the exhaust pipe from the turbocharger’s exhaust
outlet. Remove the studs.
2
Clean the sealing surfaces. Fit the longer studs included in
the flange kit.
3
Fit the measuring flange to the turbine housing with gaskets
on both sides. Fit the exhaust pipe.
4
Connect a transparent plastic hose (or a low pressure ma-
nometer) to the nipple of the measurement flange. The differ-
ence between the water columns (A) gives the back pres-
sure in WC (inches of water).
Turbocharger, checking
bearing clearance
Schwitzer S4T/Holset H3B/Holset
HSB870/B36
Checking axial and radial clearance is normally done only in
conjunction with reconditioning when it is required to ascer-
tain the degree of wear in the unit.
Measuring axial clearance
Place a dial indicator with an 8 mm (5/16") shank in the hold-
er as shown. Secure the dial indicator.
Place the holder on the compressor housing. Make sure that
the measuring point rests against the center of the shaft.
Press down the holder against the compressor intake and at
the same time press the turbine rotor up and down by hand.
Read the dial indicator.
Axial clearance:
Max 0.20 mm (0.008") .
For TD164KAE max. 0.12 mm (0.005").
For TWD1620 and TID162 max. 0.18 mm (0.007").
1.
Flange for measuring
2.
Exhaust tube
3.
Transparent plastic hose, part filled with water
5
Run the engine fully loaded and fully accelerated for a few
minutes and check the back pressure.
Max back pressure in the exhaust system is 1.0 kPa (1000
mm WC = 0.145 psi).
An exhaust system with exhaust pressure that is too high
reduces the efficiency of the engine while increasing exhaust
smoke and engine temperature, which in turn can cause
burnt valves and turbo breakdown.
Содержание TAD1630G
Страница 1: ...Workshop manual TAD1630G GE P V TAD1631G GE TID162AP TWD1620G GH TWD1630G GE P V TD164KAE ...
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Страница 80: ...Service procedures engine Group 21 78 Application of sealant to cylinder block ...
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