Volvo Maintenance Hints for 7xx/9xx - Bill Garland's Nuclear ...

Changing Timing Belt: Procedures for B23/B230 Series Engines.
For B23, B230F, B230FD and FT (incl EGR) Engines. See Michael Ponte's excellent website at
http://www.mikeponte.com/volvo/timing.htm, a complete illustrated guide to changing the timing
belt in B23/230 engines.
1. Remove engine cooling fan (fan and fan shroud, clips for preheater hose), lower
splash pan, drive belts and upper timing belt cover. It helps to have the front of the
car on ramps or jack stands. Label the drive belts so you can reinstall them
correctly.
2. Cover the radiator fins with cardboard to keep from damaging them with tools.
3. Unbolt and remove the camshaft drivebelt cover. (On B230 engines, just remove
the top half of the cover.) If this is stuck, remove the water pump pulley cover (four
10mm bolts) for better access.
4. Line up engine: Use crankshaft center bolt (24mm) to turn engine, bringing the
engine to TDC, No 1 firing. This is indicated when the mark on the camshaft
sprocket is in line with the mark on the camshaft cover or the drivebelt backplate.
At the same time the marks on the crankshaft sprocket guide plate and the oil seal
housing will be in line. IMPORTANT! Do not turn crankshaft or camshaft with
timing belt removed.
5. Secure Crank. Use special tool 5284 to hold when removing crankshaft pulley with
a 24mm socket. Remove tensioner 15mm nut and washer. Attach tool 5284 to
tension stud. Use tensioner nut (no washer) to hold tool 5284. See the notes in
Engine-Mechanical regarding inability to insert the 5284 tool tangs in certain
aftermarket harmonic balancers. If you have no tool 5284, then you can see the
notes in Crankshaft Bolt for tips on how to secure the crank.
6. Loosen the crankshaft bolt counterclockwise using a 24mm socket and the remove
vibration damper assembly. Remove the lower timing belt cover.
7. Remove Timing Belt: Loosen tensioner nut approx. 1 turn. Pull belt to compress
tensioner spring. Tighten tensioner nut. Secure spring tensioner by inserting a drill
bit or nail through hole in tensioner bolt (photos).
8. Check Tensioner: Check tensioner roller bearing. Check tensioner roller. If roller
surface is damaged, roller as well as timing belt must be replaced. Make sure the
tensioner is seated correctly back in the block and not hanging at an angle.
9. Check Crankshaft Pulley/Harmonic Balancer. If your car has high miles, the rubber
can deteriorate. Now is the time to change this if it is needed. Install the drivebelt
lower cover and the crankshaft pulley. Make sure that the dowel (guide pin) on the
sprocket engages with the hole in the pulley. Tighten the pulley bolt to the
specified torque which is 44 ft-lb (60 Nm) PLUS an additional 1/6 turn, or 60
degrees.
10. Check that engine is correctly lined up: IMPORTANT! Do not turn crankshaft or
camshaft with timing belt removed.
11. Do not contaminate the drivebelt with oil, nor kink it or fold it sharply.
12. Install Timing Belt: First place timing belt on crankshaft sprocket and then on
intermediate shaft sprocket. Two lines on timing belt should fit toward crankshaft