Blue/Gray Smoke Coming From Exhaust
[Saab 95]
Produce unwanted blue/gray smoke. There are two possible reasons: Possibility # 1 - The check valve for the crankcase ventilation sticks which forces engine oil out into the exhaust pipe, resulting in blue smoke. Possibility # 2 - The coolant flow through the turbo unit may be reduced, which results in the temperature becoming so high that the engine oil builds carbon deposits around the turbine-side bearing. Over time these deposits reduce the oil flow through the bearing, which means that engine oil is forced past the turbine shaft seal and out into the exhaust pipe, resulting in blue smoke. THE FOLLOWING PROCEDURE SHOULD ONLY BE PERFORMED BY YOUR AUTHORIZED SAAB DEALER If it applies to your vehicle! The bulletin # is 10719
| STEP 1 | Remove the engine cover. |
| STEP 2 | Cut off the cable tie securing the check valve to the camshaft cover. |
| STEP 3 | Detach the vacuum hose from the camshaft cover and the throttle body. |
| STEP 4 | Transfer the insulation hose from the old hose to the new. |
| STEP 5 | Attach the new hose to the camshaft cover nipple and to the throttle body. |
 | turn check valve so that the flow is directed away from the Valve cover |
| STEP 6 | Fasten the non-return valve to the camshaft cover using a cable tie. |
| STEP 7 | Check that the ignition key is in the OFF position. |
| STEP 8 | Remove the bolt from the turbocharger delivery pipe attachment on the engine and the hose clip at its attachment to the throttle body. |
| STEP 9 | Remove the turbocharger delivery pipe from the throttle body and bend aside the pipe. Keep the O-ring if there is one. |
| STEP 10 | Turn the throttle butterfly to the open position and clean the inside of the throttle, especially around the sealing surfaces. Use a lint-free cloth dampened with electronics cleaner. |
| STEP 11 | Grease the O-ring (if there is one) with acid-free Vaseline and fit the turbocharger delivery pipe to the throttle body. |
| STEP 12 | Fit the engine cover. |
| STEP 13 | Open the coolant expansion tank cap to release the overpressure in the cooling system. Shut the cap. |
| ************HOT ENGINE HOT ENGINE HOT ENGINE************ |
| STEP 14 | Place a receptacle under the car. |
| STEP 15 | Using a fixed spanner to hold the coolant pipe nipple in place on the cylinder head, detach the coolant pipe from the cylinder head. |
| STEP 16 | Check that the coolant pipe nipple on the cylinder head is tightened, and fit the coolant pipe with a new banjo screw and new gaskets in the cylinder head, see illustration. Fasten the pipe to the pressure sensor mounting. NOTE: Banjo screw 51 25 406 must not be fitted anywhere else on the cooling system other than on the cylinder head connection! Torque the Banjo bolt to 18.4 lbs. ft |
| STEP 17 | Top up with coolant |
Pricing for TURBOCHARGERS & RELATED (turbochargers & related)
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