13B OVERHAUL STEPS DISASSEMBLY After removing Oil pan remove Oil strainer Remove front Oil Pressure Regulator cap spring and Piston Remove Front Hub bolt Attach locking bar to flywheel Remove Front Flange Bolt Taking 19 MM socket and 24” breaker bar Only turn bolt about 1/4 inch Remove Fly wheel Nut Use 54mm socket and 24 inch breaker bar Use locking bar to flywheel Remove nut Remove Front Eccentric Shaft Bolt and washer Remove oil thermostat and spring (and spacer if installed) Remove six front cover bolts Remove Hub Tap on Front Cover with Dead Blow Hammer to remove Before Removing Oil Drive Chain - Check it Final middle link between the two shafts Push link out as far as you can Measure distance between chain links on both sides Push link in as far as you can Measure distance between chain links on both sides Difference between the two measurements is chain slack 3/8” slack is max limits Removing Oil chain Drive Take chisel and hammer and flatten lock washer below Oil pump nut Remove oil pump nut Remove oil pump drive sprocket and eccentric shaft drive sprocket together Remove Front Counter Weight Slide front counter weight off of shaft Remove thrust washer and inspect for wear Remove thrust bearing Remove front key Remove six stationary gear bolts (set on aside for later use) Remove center plate and insptect it for wear Remove selective spacer note letter on its side - record Slide up the rear thrust bearing Remove the rear thrust washer and inspect it Now place one stationary bolt and replace it in one of the six hold to temporary hold stationary gear in place Remove Oil Pump Bolts Remove Oil pump and internal lobes Remove Fly Wheel with torque wrench if you have one Install a two bolt puller Protect the back of the eccentric shaft from Puller bolt with a cover over the eccentric shaft hole Tighten up centeral puller bolt to put pressure on flywheel Then tap flywheel lightly with hammer and remove Take out flywheel key Take electic tape and wrap around threads of eccentric shaft where flywheel nut goes Remove six retaining bolts for rear stationary gear Use a seal puller or two screw drivers to remove stationary gear Once loosened, then pull straight up to remove gear Tension Bolts Break tension bolts free with a breaker bar and 17mm socket in a crisscross pattern Then use torque wrench to complete lossening tension bolts Lift bolts out of block Remove Rear Housing Take dead blow hammer and tap up until “O” rings release Then pull rear housing straight up to remove Remove dowl pins at 11 and 5 O’clock position Remove Rear Rotor Housing Tap with Dead Blow Hammer until housing releases Pull rotor housing straight up Remove Rear Rotor Work rotor back and forth to break seals from intermeditate housing Then pull rotor straight up over eccentric shaft Remove Center Housing Rotate eccentric shaft lob toward intake port Remove two more dowl pins at 11 and 5 O’Clock position Tap with dead blow hammer on housing until “O” rings release Lift eccentric shaft approx 1 “ up Rock center housing over lobe and remove Remove Front Rotor Housing Tap with dead blow hammer until “O” rings release Lift straight up and remove Remove eccentric shaft by pulling straight up Remove Front Rotor Rotate around to release seals Then rotate straight up Remove Front Stationary gear Remove the one bolt Remove Front Stationary Gear by lowering CLEANING AND INSPECTION Track location of identical parts of rotor using parts box or diagram Mineral Spirts for cleaning parts Gallon size of carburator cleaner Hot soapy wash for cast and porous parts Oven Cleaner Scouring pad Thrust Washers and Bearings Fore and aft thrust washers and bearings and thrust plate Visually Check for wear pitting groves End play clearance rnage between .001 and .003 Oil Pump Disassemble by removing set screw Take out rear outter rotor (dot faces open end of pump) Remove main shaft with two inner rotors and spacer Remove front outter rotor (dot of rotor faces open end of pump) Check clearance of front outter rotor and front lobes <0.008” Check clearance of front outter rotor and housing <.008” Place front outter rotor in housing (dot to open end of housing) Place main shaft in housing with slot in center rotor Aline slot with set screw Insert set screw with red loctite Slide rear rotor clearance rotor/housing <.008” Place straight edge on top and check clearance betwee it and rear rotor face<.0019” Front Pressure Regulator Inspection Inspect piston for any deep gauges that you can catch finger nail in Some scuffing is normal Take magnet and stick in side piston Place piston in bore and side back and forth to see that it moves freely Rear Pressure Regulator Check throught discharge port at piston for dirt or gauages Place upside down, place screw driver on pistion and push down several times if action if free then pressure regulator is OK Tension Bolts While washing tension bolts remove sealing washer and discared Clean thread and head on wire brush Get 10x1mm die put WD40 on it and put die on bolt threads and run it down with about a 1/4” sticking above the die Stationary Gears Look at gear teeth for chipping gauging or excessive wear Check bearing surface for any significant wear Mic main bearing Measure on top (teeth end) at four points 90deg apart with telescoping gauge Do same at other end of bearing Record readings Use largest figure to calculate bearing clearance Eccentric Shaft Remove the two oil jets with large bladed screw driver and unscrew jet Remove spring and check ball with magnet Inspect flywheel end of eccentric shaft threads Inspect pilot bearing by rotating it - if bad - replace Blow compessed air in every oil hold Visually inspect for scratches or scars anything you can catch finger nail on is not good Mic eccentric shaft for bearing and journals and each end of journal length rotate eccentric shaft 90 deg and measure again Use smallest measurement to calculate oil clearance A good shaft will not vary more than 0.0003 Clean Side Housings Dig out inner water jacket “O” ring Use specially ground screw drivers to remove “O” and scrape grove Combustion “O” ring has two liners and rubber center section make certain you get out liners Scrape water jacket area with blade Scub with scouring pad or skotch brite pad in air drill Baked on grease and grimve use house hold oven cleaner Scrub and let set for two hours then wash in hot soapy water Blow dry with air and rescrape grouves Chase bolt holes with thread taps Use 6x1 use for oil pump and oil pump pick up Use 8x1.25 stationary gears , front cover, intake bolt holes Use 10x1 to chase tension bolt holes Use 10 x 1.25 for bell housing bolts holes Use WD40 for lubricating hose to be chased End and Intermediate Housings Inspection Check for rust on housing and pitting Check for ruffnest Check outter wall of inner wall on casting for cracks Land Thickness >.061 3520 Flatness Slip feeler guage under straight edge Pull on feeler guage - if it moves straight edge then surface is flat Use .0015 feeler guage and check all four sides at three places Side seal wear Use dial indicator gauges and set to zero on surface Step <.004 3570 Rotor Oil Seal Wear Inner Oil seal Check “football” area Rock back and froth over wear area Outter Oil seal wear 3730 Clean out side of rotor housings in parts cleaner Scrub with tooth brush Stoch brite pad to clean carbon 3780 Remove all water jacket residue and oil ring stuff Scrape sides with utility blade held perpendicular to housing Use 400 grit sanding block to clean up sides further Keep area lubricated and use long even strokes 3835 “O” Ring Area Check Check “O” ring area of rotor housing for pitting If minor pitting then hylamyer will handle it If heavy pitting is found use JB Weld to repair 3860 Rotor Housing Minimum Width Measurements Measure inside nearest rotor at six places Record smallest measurement you get Maximum rotor width is substracted from this smallest measurement of rotor housing to get rotor clearance = .0001” 3920 Rotor Housing Inspections Beveling on edges OK if taper of belvel does not exceed .0020 Falking crome OK if less than 3/16 Scratchs at exhaust rotor Edge Groove Scratches between spark plugs 4025 Marking Rotors “F” for front rotor A, B, C for Apexs “R” for Rear rotor Gear side or Open side Front rotor has corner section of apex seal on open side Rear rotor has corner section of apex seal on gear side Lable rotors, face and apex corner on diagram Mark rotor and apex corners with apha stamp 4120 Remove Apex Seal Components 4138 Remove Inner Oil Seal from Rotor Discard old “O” Rings Keep Oil Seal Springs and Oil Seals together 4196 Remove corner seal with Magnet Remove corner seal spring Remove and discard old rubber plug 4220 Remove side seal with Magnet Remove Side Seal Springs with xato knife (carbon make it necessary to soak first) 4248 All Rotor Parts Remove No need to track corner seal and side seal springs as they will be replaced 4280 Clean small rotor parts in jar with carburator cleaner 4304 Rotor Part Washing Fixture 4388 Clean Rotors Use blade to scrape carbon off combustion area Next brush brass brush to clean same area Rinse hollow section thoroughly as they tend to hold lot of oil Put hanging wire on rotor but not through bearing area 4462 Decarbonizing Grooves of Rotors Flattened xacto knife blade Special Ground screw driver Spray groove with Carburator cleaner and clean with tool (screwdriver) Clean rotor oil grooves the same way 4550 Clean Corner Seal Pockets Get wet with Carb Cleaner Scrape carbon with screwdriver 4570 Clean apex seal groves 4580 Soak rotor in Cleaning solution again 4590 Inspection of Rotor Look for obviousl damage on thrust service of stationary gear or open side thrust Check apex seal groove for not burs Check face for damage 4605 Measure Rotor Width at Thrust Surfaces Flat spot on stationary gear Large inner ring on open side Measure six places Below each apex seal Midway between each apex seal Record readings Compare with maximu rotor housing width = 0.001 If measurements differ considerably stationary gear may have slipped out Can tap it back in with soft hammer 4680 Measure Rotor Bearing dimensions Measure 4 places 90deg apart and at each end of bearing 4719 Spring inspection Check free high of apex spring Small spring max height .130”, min height .067” Check free heigth of large apex spring Max .246”, Min .181” 4780 Rotor Oil Seal Spring Check each end and is bent up at least 45 deg from leading flat Very Important to put correct With round tap facing down rectangular taps pointing up Front rotor open side gets rectangular tabs points to the left Front rotor gear side gets rectangular tabs points to the right Rear rotor open side gets rectangular tabs points to the right Rear rotor gear side gets rectangular tabs points to the left 4830 Side Seal Springs Check each peak on each spring to make certain none are flat and likely break Lay together and make certain the hold a uniform shape 4850 Twist corner sea spring to reduce flatness 4854 Check Corner Seal Inpsect for damage Measure outside dia corner seal .432 -.433 Measure height .268 -.276 4883 Check side seal Check for damage Meausre thickness .26-.27” Measure width .112 - .124” 4905 Measure shinny side of oil seal keeper Seperate jaws by .20 If shinny area is wider oil seal keeper is worn 4932 Rotor Dry Assembly Install springs and check clearances Install corner seal springs Push down to bottom Install correct corner seal Push down and make sure it moves up and down on spring Corner seal protrustion min .020”