TRUCK SERVICE MANUAL
a. Push shaft toward side of the bore.
b. Using a feeler gauge, check minimum distance
between tip of wheel vanes and bore. Clearance should
The ST-50 and VT-50 turbocharger may be mounted in
be 0.005 to 0.033 inch [0.13 to 0.84 mm] on compressor
end and 0.011 to 0.043 inch [0.28 to 1.1 mm] on the
collector housings. Simply change relative positions of
turbine end. Fig. 10-37.
turbine casing and collector housing on bearing housing
to obtain desired location of exhaust inlet and outlet.
Band nuts must be retorqued if loosened.
In all mounting arrangements of the turbochargers.
1. Wrap fittings with Teflon tape (a minimum of 5
threads must be coated with tape) and install in bearing
housing; tighten to torque listed in Specifications. Fig.
Fig. 10-37, T-5,44. Checking radial clearance on turbine
18. Check total end clearance with a dial indicator. Fig.
10-38. End clearance should be 0.006 to 0.017 inch
[0.15 to 0.43 mm].
19. Turn rotor by hand to make sure no internal
20. Cover all oil, air and exhaust inlet and outlets to
Fig. 10-39, T-425. Torquing oil drain connection
prevent entry of foreign material during storage.
2. Check position of turbocharger oil drain. This drain
must always be In a vertical or down position or within 30
deg. of that position when turbocharger is mounted on
the engine. Fig. 10-40. Deviation from this position can
cause flooding of the bearing housing and turbine seal
3. Install gasket and position turbocharger against
exhaust manifold flange.
Secure turbocharger to
exhaust manifold flange with capscrews.
4. Install oil drain line from bottom of turbocharger to
boss provided on engine block or oil pan. Use SAE Type
100R5 wire braid hose with minimum inside diameter of
7/8 inch [22.2 mm] (SAE No. 16).
5 Pre-lubricate turbocharger by pouring clean engine
lubricating oil with STP oil or equivalent mixture through
Fig. 10-38, T-545. Checking rotor end clearance
6. Install oil inlet line. Use Teflon type wire braid hose
with minimum inside diameter of 5/16 inch [7.9 mm]
(SAE No. 6) and that will withstand up to 450 deg. F
[232 deg. C] oil temperatures.