31604-ZW4-H00 Honda BRACKET, REGULATOR (Honda Code 7531619).

Inspecting The Crankcase
Engine is dismantled.1. Thoroughly clean crankcase. Check that oil passages are free. Important:Before cleaning oil passage, remove pressurestat and refit after cleaning.Fig. 4-1
4-12. Inspect crankcase for cracks.3. Check that bearing bushes of crankshaft and camshaft are tightly seated in crankcase.4. Check that ball bearing of drive shaft is in good shape.5. Measure bearing bushes by means of a precision micrometer set to the nominal bore (Fig. 4-2) at points 1 and 2 in plane "a" and plane "b" (offset through 90°) and compare with Specification Data.Fig. 4-3
4-2
4-36. Replace any worn bushes and ball bearings (see Sections hereafter).7. Gauge main bearing bores, including ball bearing.8. Check that cylinder seating is smooth and flat (90°).9. If necessary, machine seating(s) by tool No. 150010.Fig. 4-4
4-410. Inspect all tapholes. Clean all holes by tap.11. Inspect tappet bore for wear.12. Check that cap of rear comshaft bearing bore is tight.Removing And Refitting Main Bearing Bushes
Engine is dismantled. Removing:
1. Drive out bush from crankcase (Fig. 4-5) and bearing end housing.Fig. 4-6
4-5
4-6 Important:Inspect oil nozzle for free flow.Refitting:
2. Press in bearing housing bush from stop ring side.Fig. 4-7
4-7 Note for Refitment:Use tool with the appropriate side (Fig. 4-8), so bush recedes beyond stop ring face (see Specification Data). Check that oil holes mate.
4-83. Press bush into crankcase.Fig. 4-9
4-9 Note for Refitment:Use tool with the appropriate side, Fig. 4-10, so bush projects beyond crankcase, Fig. 4-11 (see Specification Data). Check that oil holes mate.
4-10
4-11Replacing Camshaft Bearing Bush
Engine is dismantled. 1. Remove bush by special tool from crankcase. Important:Introduce tool with spotfacing ahead.Fig. 4-12
4-122. Drive in new bush.Fig. 4-13
4-13 Note for Refitment:Check that oil holes mate.Inspecting The Camshaft
Camshaft is removed.Fig. 4-14
4-14Inspect cams and journal for wear.Remachining Cylinder Seating On Crankcase
Engine is dismantled. 1. Clean faces thoroughly. Mount cutter No. 150010 with support and tighten screws moderately, so the cutter is still movable.Fig. 15
4-152. Locate cutter and secure.Fig. 16
4-163. Return locating pin and extend steel holder to diameter of seating.Fig. 17
4-174. Turn spindle clockwise and turn knurled nut so that steel holder contacts the face to be machined. Note for Refitment:Do not turn spindle anticlockwise when machining the face.5. Machine face.Fig. 18
4-186. Return steel holder and remove cutter.Removing And Refitting Drive Shaft
Removing
1. Unscrew bolt with washer from shaft.Fig. 19
4-192. Withdraw shaft with small spacer but w/o governor.Fig. 20
4-203. Engines with power take-off from camshaft: remove stop ring, retainer, and large spacer.Fig. 21
4-214. Remove ball or roller bearing, as the case may be, by standard puller.Fig. 22
4-225. Drive in bearing as far as it will go in crankcase.Fig. 23
4-236. Where a roller bearing is provided, fit inner race and front stop ring.Fig. 24
4-24Install shaft with small spacer between gear and ball or roller bearing, as applicable.Fig. 25
4-25 Note for Refitment:Install stop ring with marking for from rollers. Make sure that inner race of roller bearing will not fall into crankcase.7. Secure drive shaft by bolt and large washer. Note for Refitment:Secure bolt with DEUTZ DW 60 compound or equivalent Locktite 0242 blue.Inspecting The Main Bearing Shells (Bracket on F2L)
Bracket is removed. 1. Thoroughly clean bracket. Check that oil passage and nozzle are free.2. Provided the bearing bore has no high spots from the shells, gauge bore with precision micrometer.Checking Preload
3. Assemble bracket as numbered. Screw in bolts, preload and tighten as specified.Fig. 26
4-264. Set micrometer by frame to nominal value (see Specification Data).Fig. 27
4-275. Gauge bearing bore (Fig. 4-28) at points 1 and 2 in plane 'a' and plane 'b' (offset through 90 °),
4-28Fig. 4-29, for size, ovality and conicity.
4-296. If gauge reading conforms to the Specification Data, this suggests that the bearing bore will ensure proper shell preloading.7. Should the reading depart slightly, perform additional measurement with installed new shells.8. Fit new shells and cap and tighten as specified. Repeat gauging.Fig. 4-30
4-309. Measure bearing at points 1 and 2 in plane 'a' and - offset through 90° - plane 'b'.Figs. 4-29 and 4-31
4-3110. If the reading departs up to 0.020 mm from the tolerance specified, the bracket can be retained. Failing this, the bracket must be replaced. Restoration of the specified preload by shims under the shells or machining joints is not permissible.Fitting Bearing Bracket To Crankshaft
1. Check that