| Cadillac Engine >> LOOSE INTAKE MANIFOLD BOLTS ON HT4100 ENGINES |
Loose Intake Manifold Bolts On
1982-83 Cadillac 4.1L (252 CID) V-8 HT4100 Engines
Oil consumption, excessive coolant loss and poor performance may be due to loose intake manifold bolts on some 1982-83 Cadillacs equipped with subject engines.
To cure the problem, carefully retorque the bolts. This is preferable to installing a new gasket because the new gasket will crush over time and lead to another loss of bolt torque.
If the intake manifold gaskets must be replaced, not that a restrictor in the center exhaust crossflow port is located on 1983 right bank gaskets. This restrictor is not required on 1982 engines.
When retorquing the bolts, the correct sequence and ft-lbs must be adhered to or engine distortion may occur. The sequence is shown below:
Bolt Tightening Sequence
1. Tighten bolts 1,2,3 & 4 in sequence to 15 ft-lbs (20.0 N·m).
2. Tighten bolts 5 thru 16 in sequence to 22 ft-lbs (30.0 N·m).
3. Retighten all bolts in sequence to 22 ft-lbs (30.0 N·m).
4. Repeat Step 3.
The AERA Technical Committee
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