Cylinder Head Remove and Install

REMOVING CYLINDER HEAD
- Take off intake manifold support and venting hose from valve cover.




- Unscrew nut (1...8) and take off valve cover.

Installation Note:
- Check gasket, replacing if necessary.
- Tighten nuts in order of 1 through 8.
- Tightening torque = 9 Nm (6.5 ft. lbs).

- Disconnect battery.

CAUTION: Disconnecting the battery will cancel the fault memories of control units, so that fault memories must first be interrogated with a tester and, if applicable, faults should be printed.
BMW anti-theft radios can be rendered useless by disconnecting the battery. Make sure you know the correct code before disconnecting the battery. See your owner's manual for more information.




- Unscrew exhaust pipes on exhaust manifolds and loosen clamp of holder on transmission.

Installation Note: Replace gaskets and self-locking nuts. Coat studs with copper paste. Tightening torque = 50 Nm (36 ft. lbs.).




- Drain coolant on engine and radiator.
- Drain engine oil.

Installation Note: Fill and bleed cooling system.




- Disconnect cables and unscrew holder.




- Loosen hose clamp and pull off intake air hose on air cleaner.
- Pull off plug on air flow sensor.




- Pull off plug on idle speed control.
- Cut off wire strap and pull off vacuum hose for brake booster.




- Disconnect radiator hoses (1 and 2), heater hose (3) and fuel hoses (4 and 5).

Installation Note: Don't mix up fuel hoses (4 and 5).




- Pull off hose (1) and plugs (2 and 3).
- Disconnect plug (4).




- Unscrew knurled nut and take off plug.
- Unscrew nut and take wire connector plate off of intake manifold.




- Remove fan.
- Lift out expansion rivets at left and right top on fan cowl and remove fan cowl.

Installation Note: Check for correct seating of bottom guide.




- Loosen clamp and take off preheating hose.
- Unscrew guide tube for oil dipstick on manifold.
- Remove toothed drive belt, refer to Timing Belt, Service and Repair.




- Disconnect heating hose on cylinder head.




- Press down on venting pipe and arrest with Special Tool 11 1 290.

Installation Note: Check seal, replacing if necessary.
Check for correct seation of venting pipe after removal of Special Tool 11 1 290.

6 Cylinder M20 Tighten Sequence:

- Release cylinder head bolts working from outside to inside in sequence 14...1.
- Remove cylinder head.




INSTALLING CYLINDER HEAD

CAUTION: Remove oil and debris from bolt holes. If not, improper values or damage may result.

- Clean cylinder head bolts.
- Lubricate threads and bearing surfaces of bolt heads with oil lightly.
- Replace cylinder head gasket, Cylinder Head Gasket, Replace.

6 Cylinder M20 Tighten Sequence:

- Tighten bolts in order of 1 through 14 in three steps.
Step 1 - Torque all bolts to 30 Nm (22 ft.lbs.).
Step 2 - Torque angle all bolts 90°.
Step 3 - Torque angle all bolts 90°.

NOTE: Cylinder head is not retightened after 1,000km (600 miles)

- Reinstall all auxiliary components in reverse order of disassembly, paying close attention to installation notes and torque specs.
- Adjust valve clearance, refer to Valve, Intake/Exhaust,Valve Clearance.
- Check engine idle speed and CO level.