Re: 1972 25hp Model 25253 - No Spark Top Plug
Here is a procedure I made awhile back.
How to remove a flywheel
Tools: Harmonic balancer puller (chicken foot puller) 3 grade 8 bolts 3 washers that will thread into the 3 holes on the top of the flywheel. Can of penetrant (PB Blaster, WD40 etc.) 18?-24? pipe wrench. 2lb. Hammer.
Many auto part stores have loaner tool programs. Use proper tools and procedures and the job will get done right.
Loosen the center flywheel nut, spray penetrant on the crank/ flywheel then finger tighten the nut back on and loosen it one and a half turns.(leaving the flywheel nut on will keep the flywheel from jumping anywhere when it comes loose.)
Place the harmonic balancer puller into position, and install the 3 grade 8 bolts and washers (make sure that they thread well into the flywheel, but not too far as they could damage ignition components.)
Tighten the center bolt of the puller while holding the puller, (use the pipe wrench to hold a leg on the puller if needed.) Get the puller good and tight. It should pop and be loose.
If it didn?t come loose, ?rap? the center puller bolt on the top with a 2lb hammer. If it still doesn?t pop, tighten the puller some more, then ?rap? the puller bolt again. Keep repeating until it pops. (hammer hits are rated-- Tap, Rap, Light swing, Heavy swing)
Some people just let it set overnight under tension and it is loose in the morning. I have used a hair dryer to gently heat up an aluminum flywheel under tension and that worked.
If your flywheel has been extremely difficult to remove, make sure you inspect the underside of the flywheel, and check you?re ignition components for rub damage. This is an indication that the flywheel was over torqued and caused the flywheel to contact the ignition components. In this case replace the flywheel.
Reassembly?..Tools: Torque wrench and a strap wrench.
Use a torque wrench and the proper torque rateing in the OEM manual. Many people on this forum can help find the proper torque for you. Use the strap wrench to hold the flywheel. Some torques are in inch pounds and others are foot pounds ect. Here is a easy online torque converter.
http://www.pitt.edu/~rsup/touqueconv.html
You can make a strap wrench from an old belt and a piece of wood. Secure the belt close to the buckle onto the wood with screws.
