I have a McCulloch EB428 chainsaw and the auto oiler has stopped working. I can’t seem to find why ad have cleaned all the area I thought would be cogging the flowof oil. The oiler worked fine and then the last time I used it no oil fowl tothe bar. Any ideas?
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Good on you for what attempted already. I looked at the print and it appears there is a worm gear (item 50) and a driven pump (item 61) behind the clutch. I suspect one of the 2 has failed. I know you have done most of this already But does it ooze with the bar off?
Oil System Plugged:

Remove the clutch cover, bar, and chain, clean the bar groove, any holes and passages on the rear of the bar (both sides, consider rotating the bar), if equipped with a sprocket nose ensure it rotates easily at least one complete revolution. Clean the saw oiler hole and channel. Insert a blunted, hooked piece of wire through the oil filler hole and pull the hose in the oil tank out. Pay attention to the screen or filter on the free end (clean or replace, difficult to determine serviceability). Start the saw and see if it oils when revved up (oozes down side of saw). If yes reassemble your saw. If no, continue with 2.
Work your way through the linkage (use IPL to identify components and locations) cleaning and replacing any defective parts as you go. Carefully check the hoses for cracks especially at bends and connections. If equipped with an oil pump it is usually behind the clutch (clutch is a left handed thread). Please make extensive notes & some digital pictures will help during reassembly.
If it does not oil on completion of 1 it is most likely a bad oiler or worm gear (see IPL).

A link to the only IPL for a McCulloch EB428 follows:

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
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McCulloch chain saws operate with an automatic oil pump, which utilizes a piston to force lubrication from the tank onto the spinning bar and chain. While the pump works automatically once the clutch engages, you can regulate the overall output, increasing or decreasing the amount according to the cutting needs.
The most common reasons why your automatic oiler isn`t working are: Your chainsaw`s oil tank is empty. The chainsaw oiler is clogged. The oil pump is broken.
As their name suggests, automatic or fixed flow oilers provide a consistent amount of oil whenever the saw is running. Any time you use your saw, you`ll get the same amount of oil on your chain.
The oil adjusting screw is just below the base of the chain and guide bar. Turn the screw counterclockwise toward the plus symbol, “+,” to increase the guide bar oil flow or clockwise to the minus symbol, “-,” to decrease the bar oil flow, says Garden Tools & Instruments.
When you want to turn the engine off, the ignition switch is set to off, or a kill switch is depressed. This creates a circuit from the ignition coil straight to engine ground. Now, the circuit is grounded, and the spark plug no longer fires. This will cause your chainsaw to shut off.
One tell-tale sign that a chainsaw has flooded is the smell of fresh petrol near the muffler. To ascertain whether this is indeed the problem, simply disassemble the part, pull the starter cord as if you were switching on the engine, then dry it, reassemble it and try switching it on again.
Stop your vehicle if the oil pressure light turns on. Then check your oil pressure gauge. If the reading is low, then it causes oil pump failure. If the engine produces sound, it also is a signal of oil pump failure.
Oil pumps are usually either inside the oil pan and driven by a camshaft or outside the pan and driven by a crankshaft. When those engine parts start moving, the pump starts working at the same time to pump oil to reduce friction and wear between moving parts and prevent the engine from seizing.
Oil pumps are usually operated by the crankshaft by way of auxiliary drives. The delivery of the oil pump is governed by its size, speed and design. There are several important reasons for engine lubrication: To supply all sliding components with sufficient oil to reduce friction and wear.
Contact With The Ground

With a single contact with the ground while running, a chainsaw can become very dull. This is because the ground contains sand and dust which is abrasive and contains a lot of tiny rocks. To avoid such occurrences, avoid cutting wood placed on the ground.

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Automatic oiler has never worked well even when saw was new, chain never gets enough oil. Should I use a lighter grade oil, or what else should I check?
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