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Re: removing flywheel and clutch assembly ms 250 stihl
You need a piston stop, watch part of this to explain use: http://www.youtube.com/watch?v=cdqkIuVNUQc Make one with starter cord or rope: I suggest a length of starter cord or nylon rope be used instead of the piston stop (retain 6" ± so you can remove it). Make sure the piston is near the top of the cylinder before feeding the cord or it can fall through the exhaust port and damage the piston as it rises. HTH Lou
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Remove the side casing. (bar side) Take off bar and chain. Remove E-clip holding the clutch drum on. Remove clutch drum and needle cage bearing. This should expose the clutch. Remove spark plug. Use a piston stop to stop the piston rising, Sometimes a knotted piece of pull cord fed into the cylinder is just as good. Turn the clutch clockwise with a socket to unscrew.
To put clutch back on turn anticlockwise till piston cycles back and hits the piston stop again and tighten. Replace spark plug and clutch drum, bearing, bar and chain and side casing.
To remove the oil pump you need the following:
Assembly tool 1123 890 2200 Removing oil pump
Puller 1130 893 1400
Installer 1130 893 1500
I would recommend trying to clean out the oiler first.
Please comment on this and tell us what type of oil you were using. There are rumors of wrong oil clogging or wearing the oilers. Was it used motor oil?
Rotate the flywheel until the magnets are under the module, insert a thin business card into the pole gaps, loosen the module screws and allow the module to contact the magnets. Tighten the screws and rotate the flywheel somewhat to release the card. Turn the flywheel one full turn to make sure the pole gaps don't close further. Hope this helps!
The only wire in that vicinity would be the ignition switch wire--expose the flywheel/ignition module by removing the starter/side cover and check the ignition module--there should be a wire coming from a dis-connect terminal going to the ignition switch. Hope this helps!
If the clutch assembly is to be reused, matchmark the pressure
plate and the flywheel so they can be assembled in the same position.
Install flywheel holding tool T84P-6375-A or equivalent, in a
transaxle mounting hole on the engine and engage the tooth of the
holding tool into the flywheel ring gear.
Fig. Fig. 1: Install a flywheel holding tool in a transaxle
mounting hole on the engine, and engage the tooth of the tool into the
flywheel ring gear
Loosen the pressure plate-to-flywheel retaining bolts one turn at
a time, in a crisscross pattern, until the spring tension is relieved,
to prevent pressure plate cover distortion.
Support the pressure plate and unfasten the retaining bolts. Remove the pressure plate and clutch disc from the flywheel.
If the flywheel shows any signs of overheating (blue discoloration)
or if it is badly grooved or scored, it should be refaced or replaced.
Inspect the flywheel, clutch disc, pressure plate, release
bearing, pilot bearing and the clutch fork for wear. Replace parts as
If removed, install a new pilot bearing using a suitable installation tool.
If removed, install the flywheel. Make sure the flywheel and
crankshaft flange mating surfaces are clean. Tighten the flywheel
retaining bolts to 71-76 ft. lbs. (96-103 Nm) on the 1.8L engine or
54-67 ft. lbs. (73-91 Nm) on the 1.9L engine.
Clean the pressure plate and flywheel surfaces thoroughly.
Position the clutch disc and pressure plate into the installed position
and support them with a dummy shaft or clutch aligning tool. If the
clutch assembly is being reused, align the matchmarks that were made
during the removal procedure.
Install the pressure plate-to-flywheel retaining bolts. Tighten
the bolts in the correct sequence to 13-20 ft. lbs. (18-26 Nm). Remove
the alignment tool.
Fig. Fig. 2: Position the clutch disc and pressure plate into the
installed position and support them with a clutch aligning tool
Fig. Fig. 3: Tighten the pressure plate-to-flywheel retaining bolts to specification in the sequence illustrated
If the release bearing was removed, lubricate the release fork
where it contacts the bearing and install the bearing in the fork.
Install the transaxle assembly.
Lower the vehicle.
Bleed the hydraulic clutch system, if needed.
Connect the negative battery cable.
Road test the vehicle and check the clutch for proper operation.
Before servicing the vehicle, refer to the Precautions Section.
Disconnect the negative battery cable.
Remove the transaxle.
Gradually loosen the clutch pressure plate bolts, in a crisscross pattern. Support the pressure plate and remove the bolts. Remove the pressure plate and clutch disc.
Inspect the pilot bearing. If it is worn or damaged and does not turn easily by hand, remove it using a puller/slide hammer.
Check the flywheel surface for scoring, cracks or burning and machine or replace, as necessary.
Install a flywheel holder to keep the flywheel from turning. Loosen the flywheel bolts evenly and gradually in a crisscross pattern. Remove the flywheel.
Inspect the clutch release bearing for wear. Replace it if it sticks or does not turn easily.
Inspect the release fork for wear or damage and replace as necessary.
Structural view of the hydraulic clutch system
Exploded view of the clutch assembly Click to Enlarge
Flywheel tightening sequence
Pressure plate tightening sequence
Lubricate the release fork fingers and pivot with molybdenum grease and install in the release fork boot.
Install the clutch release bearing on the release fork.
Install a new pilot bearing in the flywheel, if removed.
Be sure the flywheel mounting surface and the crankshaft or eccentric shaft mounting surfaces are clean. Remove any old sealant from the flywheel bolt hole threads and the flywheel bolts.
Install the flywheel.
Apply sealant to the flywheel bolt threads and install them hand-tight. Install the flywheel holding tool. Tighten the bolts, in a crisscross pattern, to 71–76 ft. lbs. (96–103 Nm).
Apply a small amount of molybdenum grease to the clutch disc splines and install the clutch disc on the flywheel, spring side toward the transaxle. Install a suitable alignment tool in the pilot bearing to position the clutch disc.
Install the clutch pressure plate, aligning the dowel holes with the flywheel dowels.
Install the pressure plate bolts and gradually tighten, in a crisscross pattern to 20 ft. lbs. (26 Nm). Remove the alignment tool.