ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – Fuel in Coolant

Symptom Tree  t091

This is symptom tree t091
Cause Correction

Bulk coolant supply is contaminated

Check the bulk coolant supply. Drain the coolant and replace with noncontaminated coolant. Replace the coolant filters. Refer to Procedure 008-018.


Cylinder head is cracked or porous

Remove intake and exhaust manifolds. Check for evidence of coolant leak. If necessary, operate engine at low idle. Pressure-test the cylinder head. Refer to Procedure 002-004.

Last Modified:  29-Jul-2005