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Saab
Saab 9-5 models with 4-cylinder engine (1998-2000 up to VIN Y3041906) may produce unwanted blue 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.
Step 6 ******The check valve must be turned so that the flow is directed away from the camshaft cover towards the throttle body, see the arrow on the check valve.
Step 7 Fasten the non-return valve to the camshaft cover using a cable tie.
Step 8 Check that the ignition key is in the OFF position.
Step 9 Remove the bolt from the turbocharger delivery pipe attachment on the engine and the hose clip at its attachment to the throttle body.
Step 10 Remove the turbocharger delivery pipe from the throttle body and bend aside the pipe. Keep the O-ring if there is one.
Step 11 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 12 Grease the O-ring (if there is one) with acid-free vaseline and fit the turbocharger delivery pipe to the throttle body.
Step 13 Fit the bolt to the turbocharger delivery pipe attachments on the engine and the hose clip to the attachment on the throttle body.
Step 14 Fit the engine cover.
Step 15 Open the coolant expansion tank cap to release the overpressure in the cooling system. Shut the cap.
Step 16 ******* HOT ENGINE< HOT ENGINE> HOT ENGINE*******
Step 17 Place a receptacle under the car.
Step 18 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 19 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 lbf ft
Step 20 Top up with coolant
posted by 24.97.2...
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