Info from one of the four TEA-20 with the English STANRARD Petrol Engine I own: The Governor weights were ready to fall off/detach from the holding pins. Chain, Sprockets, Governor ,Gaskets, Front oil seal were replaced at sometime in 1967> 1969 when a MAJOR was done to the ENGINE. I rotated the crankshaft CW/CCW and noticed 4 TEETH on the FLYWHEEL had to move before the DISTRIBUTOR ROTOR would move. Now only one tooth on the flywheel will pass before the Rotor moves. The governor was sticking at full throttle and would not idle down. Info I compiled when REPLACING Crank sprocket ,Cam sprocket and Timing Chain. (1) 85 MM Bore Engine: (2) Front Lip Oil Seal National /Federal Mogul Lip Seal # 472164V A SMALL amount of BLUE Silicone was placed around the inside bore of the front timing chain cover before Lip seal was installed: (3) I installed a repair SLEEVE on the front drive Pulley, make DURA SLEEVE # 99175. The sealing area were the LIP SEAL makes contact was slightly grooved. Dura Sleeve specs. 1.745>1.753 Diam. # 68 Rockwell Hardness: (4) On installation the Governor plunger shall be re-seated tight against the Flyweights and no weights shall be loose or hanging down: (5) A small amount (only enough to make the surface shiny) of engine oil was added to the shaft of the governor PLUNGER as well as the timing chain: (6)There are NO timing Marks on the NEW Sprockets. You may wish to line the timing marks up (facing each other) before you remove the sprockets: (7)Place the old sprocket (CAM SPROCKET) on top of the new sprockets and accurately scribe the new sprockets as to the timing marks. There are FOUR hols in the hub of the CAM SPROCKET. Keeping turning the old sprocket until the four hols and all teeth line up. These hols are slightly off set. I used several SHOULDERED cap screws to ensure I had the new and old sprockets properly aligned. You may have to flip the old sprocket over...see right up: ( It's good practice to measure the thickness of the hub of the old crankshaft sprocket and the new crankshaft sprocket as the teeth on the two sprockets should align for both proper operation and longevity.(there were shims between the old Crankshaft sprocket and the shoulder portion of the crankshaft): Cheers Bob... As you seem to be deep into the Cam / crankshaft drive area ..... this is the one area that always suffers from PREVIOUS OWNER SYNDROME. That is this area is NEVER given the rightful attention. When the FLY weights fall off and become jammed the chain and sprockets ...this is a true pain in the ARSSSS. If you install new Cam sprocket,Crank sprocket,Chain,be sure to check with straight edge that the Cam sprocket aligns with the Crank sprocket. There was original SHIMS place behind the Crankshaft sprocket as per required:.PREVIOUS OWNER SYNDROME. Do a comprehensive inspection of these Governor Fly weights: All the best..... these tractors are a beautiful machine...PREVIOUS OWNER SYNDROME....has cause a lot of problems: Bob....Retired Power Engineer...Owner operator TEA-20's
|