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Вот про дымление на холодном двигателе. Перевод,увы, каждый сам.
Smoking Tailpipe: Mazda 2.0L and 2.2L
Posted 9/7/1999
By Tom Anderson
Smoking from the tailpipe has been a problem with the Mazda 626, MX-6, B2000 and B2200 with FE and F2 engines. These engines have a timing belt driving the camshaft. The problem is not often seen in the chain driven 2.0L engines. The customer's complaint is smoke from the tailpipe after starting a cold engine. This has been a problem since this engine came out on the 1983 Mazda 626. The smoke may be blue or white and it clearly smells like oil. The condition usually happens after exceeding 100,000 miles, but has been experienced with as little as 70,000 miles. The latter can usually be attributed to poor oil and filter maintenance.
After the engine has run a few minutes, the smoke usually dissipates. As the engine warms, the oil rings do a better job of sealing. Add a warm catalytic converter cleaning up what gets past, and very little smoke is then seen coming from the tail pipe. The actual amount of oil consumed is usually very low with this problem.
The problem is with the oil control rings. Either they become stuck in the groove or, more commonly, the ring is so badly worn that it won't seal well enough to keep the oil off the cylinder wall. If the oil rings are stuck because they are packed with carbon, the owner needs to do a better job of maintenance. In the case of the worn ring, it's still a re-ring job because the oil rings lost the friction battle with the block.
The cylinder block has a very high nickel and carbon content, which makes the cylinder walls very hard, so there is little wear on the cylinder. Rarely will you see a ring ridge or any taper to the cylinder. The honing marks may still be visible. In some cases, the oil control rings have been found to be worn so much that the oil control ring spacer/expander has been wearing on the cylinder wall.
To repair, clean the ring grooves (a used broken compression ring works great for this), deglaze the cylinders, clean and reassemble. You may want to replace the valve stem seals and do a valve job, if needed. Since the guides for the valves are bronze inserts, there is little wear. Smoking on start-up doesn't always mean valve seals ... in fact, these days it's almost always rings.
Tom Anderson is an IDENTIFIX Repair Hotline Asian specialist. He is ASE master and L1 certified, with 21 years of experience.
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значит кольца компрессионные в норме.
