The automatic oiler on a McCulloch 1432 chain saw allows the oil pump to deliver oil to the bar without you needing to worry about adjusting the pump manually. This ensures enough lubrication reaches the bar during operation. At full speed the chain can reach 50 feet per second, and a lot of this friction is reduced by the oil. So if the oil pump isn't working properly, you need to stop the saw immediately and figure out why oil isn't flowing to the bar.
Things you need
T-25 Torx wrench
Replacement felt washer
Unscrew the top cylinder cover with the screwdriver. Wiggle the rubber boot off the tip of the spark plug, which will be on top of the engine, beside the cylinder. Unscrew the clutch cover using the socket wrench and the 5/8-inch socket. Unscrew the screw at the back of the clutch cover using the T-25 torx wrench. Take the cover off.
Lift the bar off the mounting studs and guide plate. Take the chain off the bar. Use the knife's tip to scrape clean both guide slots on the bar. Scrape out all compacted oil and sawdust. Clean the bar oiler holes at the base of the bar, near where it seats onto the mounting studs with the knife. Wipe the bar clean with the rag and inspect the bar for signs, such as warping or dents, that could prevent oil from reaching the chain.
Withdraw about 10 inches of starter rope from the starter. Feed the rope slowly into the cylinder hole, where the spark plug was, so about 2 to 3 inches of rope are in the cylinder. Place the 13-mm socket onto the socket wrench and unscrew -- clockwise -- the bolt at the centre of the clutch hub. Pull off the bolt, dust plate, clutch assembly and clutch drum from the crankshaft stub.
Unscrew the two bolts, beside the mounting studs, using the Phillips-head screwdriver. Remove the anti-dust cap from the top of the oiler. Pull up the worm gear --- a circular, serrated plastic piece --- from the rear bar stud using the needle-nosed pliers. Using the tip of the flathead screwdriver lift up the secondary portion of the worm gear and the pump shaft from the housing area.
Remove the pump shaft from the oil pipe. Clean the shaft with a mild cleaning agent, like dish soap, and inspect for cracks or damage.
Disconnect the two oil hoses from the housing area using the flat tip of the screwdriver. Lift the hoses up and remove the brass pump housing from the oil pipe with the needle-nosed pliers. Clean the brass pump housing and the oil hoses with the cleaning agent and inspect them for cracks and tears. Replace all damaged oiler parts as necessary.
Lift the felt washer off the crankshaft stub and replace it with a new washer. Always replace the felt washer when repairing the oiler. Reinstall all oiler, clutch and bar components in the reverse order.
Things you need
- Flathead screwdriver
- Socket wrench
- 5/8-inch socket
- T-25 Torx wrench
- 13-mm socket
- Phillips-head screwdriver
- Needle-nosed pliers
- Dish soap
- Replacement felt washer