TROUBLESHOOTING
Page 75
Cylinder Head Coolant Passage
Leak Check — Out of Chassis
Refer to Figure 66.
1. Remove cylinder head from the engine.
2. Fabricate a suitable 3/4-inch thick (19.1 mm)
steel plate and a 1/4-inch (6.4 mm) rubber
gasket. The plate must have cutouts for the
entire combustion chamber. Position plate
and gasket assembly on the underside of
head and secure with C-clamps, or with
head bolts if the plate has been drilled for
bolts.
3. Use suitable plate and gasket to seal the
water manifold openings. Install an air fitting
onto the plate.
4. Immerse the cylinder head in water. Heat the
water and head to 150
°
F (66
°
C).
5. Apply up to 50 psi (345 kPa) air pressure to
the fitting installed in the plate covering the
water manifold opening. Check for air
bubbles. The formation of air bubbles
indicates that the cylinder head coolant
passages may be leaking.
66
Figure 66 — Cylinder Head Coolant Passage Leak Check (Out of Chassis)
5_106_00.bk Page 75 Friday, August 4, 2000 11:17 AM
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