8 Attachment(s)
Retightening of cylinder head bolts - Saab 9-5 M98-M01
TECHNICAL SERVICE BULLETIN
Bulletin Nbr: 210-2402 utg. 2
Date:...........June 2003
Market: all
Procedure to remedy coolant/oil leakage from cylinder head without gasket replacement
Cars affected
Saab 9-5 M98-M01 with engine variants B205 and B235 up to and including Vehicle Identification Number 13055567.
Background
The clamping force in the cylinder head bolted joint can decrease after a period of driving. In most cases the leakage is not so great that the quantity of oil or water decreases noticeably. The leakage can be due to a combination of heat, the tightening process in production as well as that the bolts in the process have been treated with anti-friction coating and wax. After the above Vehicle Identification Numbers anti-friction coating and wax treatment have been discontinued and replaced by phosphatising and anti-corrosive oil. The tightening of the cylinder head bolts in the production process has also been adapted to the bolts' new surface treatment and takes place in steps in the same way as in the after-market.
In the case of customer complaint see Procedure.
Symptom description
Visible external coolant/oil leakage from the cylinder head.
Attachment 8530
Parts required
79 71 864 Cable tie (CA: 30509025)
81 24 158 Gasket, 2 pcs/car (CA: 30509682)
Procedure
Retightening of bolts is adequate to regain the clamping force in the joint. The gasket is therefore not replaced.
Following the procedure, clean away oil and coolant externally. Check oil and coolant levels and rectify if necessary. Start the engine and check that the leakage has ceased. In the event of significant leakage or if retightening has not remedied the leakage then the gasket must be replaced. Follow the instructions in WIS - Engine - Basic engine, 4-cyl (petrol) - Adjustment/Replacement - Cylinder head.
Retightening of cylinder head
1. Remove the upper engine cover.
2. Remove the connector and remove the ignition discharge module.
Attachment 8531
3. Remove the crankcase ventilation pipe banjo screw.
Attachment 8532
4. Remove the solenoid valve connector.
5. Remove the screw for the crankcase ventilation pipe on the camshaft cover.
6. Remove the nipple for the crankcase ventilation from the camshaft cover and cut off the cable tie at the non-return valve.
Attachment 8533
7. Remove the camshaft cover.
8. Undo bolt number 1 and tighten it. Repeat this in turn for the other bolts and in fitting order as per the illustration.
Tightening torque 40 Nm (30 lbf ft)
Attachment 8534
9. Tighten the bolts again in step I in fitting order as per the illustration. Tighten the bolts one more time in step II.
Tightening torque step I, 60 Nm (44 lbf ft)
Tightening torque step II, 90°
10. Clean the sealing face on the camshaft cover and the cylinder head using benzine.
Attachment 8535
11. Smear oil in the recess on the camshaft cover and fit the cover starting at the recess. Following which, tighten the bolts in the order shown in the illustration.
Tightening torque 15 Nm (11 lbf ft).
12. Fit the banjo screw to the crankcase ventilation pipe. Use new gaskets.
Attachment 8536
13. Connect the solenoid valve connector.
14. Fit the nipple for the crankcase ventilation to the camshaft cover and a new cable tie to the non-return valve.
Attachment 8537
15. Fit the screw for the crankcase ventilation pipe on the camshaft cover.
16. Fit the ignition discharge module and connect its connector.
Tightening torque 11 Nm (8 lbf ft)
17. Clean the surfaces of oil/coolant leakage.
18. Fit the upper engine cover.
19. Check/adjust the coolant and oil levels.
20. Connect the exhaust evacuator, start the engine and check that the leakage has ceased.
Re: Retightening of cylinder head bolts - Saab 9-5 M98-M01
Could this cause a large coolant leak? I just bought a 99 9-5 4cyl and it has a coolant leak, haven't had much time to pin point anything as I got the car a day ago but it seems like it's coming from the rear.
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Retightening of cylinder head bolts - Saab 9-5 M98-M01
This is a debatable move. Some people say it absolutely works and others think it's waste of time. I've seen guys do them on '99-'07 9-5s (most recently an '07 Aero with 75k and there were actually 2 or 3 head bolts that I'd throw in the category of loose.)