Timing Belt B230

 

1 Remove the fan clutch and fan assembly, the fan shroud, and
the accessory drivebelts.  On B230 engines, also remove the
water pump pulley.

2 Unbolt and remove the camshaft drivebelt cover.(On B230
engines, just remove the top half of the cover.)

3 Using a wrench on the crankshaft pulley center bolt, bring 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. (The pulley mark cannot be used even if the
pulley is still in place, since the timing scale is on the
drivebelt cover.) Although it is not critical, the position of
the auxiliary shaft sprocket timing mark should also be noted
(photos).

4 On B230 engines, remove the starter motor or the flywheel bot-
tom cover plate.  Have an assistant jam the ring gear teeth,
then loosen the	crankshaft pulley bolt without disturbing the set 
position of the crankshaft.  Remove the bolt and the pulley, then 
remove the lower half of the camshaft drivebelt cover.

5 On B23 engines, if the crankshaft pulley was not removed with
the accessory drivebelts, remove it now.

6 Loosen the belt tensioner nut.  Pull on the belt to compress
the tensioner spring.  Lock the tensioner in this position, either by
tightening the nut again or by inserting a nail or similar into
the hole in the tensioner shaft (photos).

7 Mark the running direction of the belt if it is to be re-used,
then slip it off the sprockets and tensioner roller and remove
it.  Do not rotate the crankshaft, camshaft or auxiliary shaft
with the bolt removed.

8 Spin the tensioner roller and check for roughness or shake;
replace if necessary.

9 Do not contaminate the drivebelt with oil, nor kink it or fold
it sharply.

10 Before installing, make sure that all three sprockets are in
the correct positions.  Slip the belt over the sprockets and around 
the roller, observing the correct running direction if the old belt
is being re-used.

11 Recheck the alignment of the sprocket marks, then release
the belt tensioner by loosening the nut or pulling out the nail. 
Tighten the tensioner nut.

12 On B230 engines, 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.  Jam the ring gear
teeth and tighten the pulley bolt to the specified torque. 
Install the starter motor or flywheel cover.

13 On all engines, rotate the crankshaft two full turns
clockwise.  Stop at TDC, No 1 firing, and check that the various
timing marks still align.  Loosen and retighten the tensioner
nut.

14 Install the drivebelt cover (or the top section), then
install the accessory drivebelts, pulleys, fan etc.

15 Run the engine to operating temperature, then switch it
off.  Bring the engine to TDC, No 1 firing.  Remove the access
plug from the front of the drivebelt cover, loosen the tensioner
nut once more and then retighten it.  Install the access plug.

16 If a new belt has been installed, repeat paragraph 1 5 after
approximately 600 miles (1000 km).

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