Operation Manual

Table Of Contents
Job Card No.:
Engine:
Filing No.:
Valve Guide Clearance
Checking / Reconditioning
0178-08-10 1799
01.06.01 Page 2 of 2
S/BVM 628
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Refitment of guides is done after undercooling (shrin-
king) in liquid nitrogen (boiling temperature: -195,8°C)
down to between -170°C and -195°C. To ensure that
the guides are cooled deep into their cores, check that
the nitrogen has stopped boiling (see also Section 3.7).
Make also sure that all shrink-fit surfaces are per-
fectly clean (metallically bright).
Introduce valve guide into cylinder head until the
dimensions specified (page 1) have been reached.
Grind-in and check valve (Job Card 01.07.01). Renew
the 0-ring for sealing the valve stem abd push it into its
groove with the aid of the valve stem, using a second
valve stem to prevent the ring slipping beyond the
groove. Install valves (Job Card 01.05.01).
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