Question 1

How can a noisy lash adjuster be isolated and repaired in V6 engine on Pontiac Fiero?

Accepted Answer

A noisy lash adjuster can be isolated while the engine is idling by holding a length of hose or tubing against each valve and listening at the other end or removing the rocker arm cover and feeling for shock on each valve spring retainer if a valve adjuster is bad. If adjustment is correct, one of the reasons for noise is dust between the plunger and the adjuster body. For one, locate and take off the rocker arm cover as well as the intake manifold, and next on, loosen the rocker arm nut and swivel the rocker arm in an anti-clockwise direction until you can pull out the pushrod. To remove the adjuster, one is encouraged to use a special hydraulic tool called the adjuster removal tool or utilize a scribe to push the adjuster upwards but not apply any tool on the outside will damage it. Return the adjusters to their original positions for replacement; it is often easier to install a new adjuster than to repair a defective one due to the fact that internal components of an adjuster are not available in the market. Still, some degenerative adjusters may return to normal operation by disassembling and cleaning the dirty ones. During the installation of the adjusters, the latter must be replaced in their original bores and must be lubricated using moly-base grease or engine assembly lube for additional measures, while the rest of the steps is to follow the reverse procedure of removal.

Question 2

How can a noisy valve lash adjuster be isolated and how to removal and inspection in V8 engine on Pontiac Firebird?

Accepted Answer

By using a length of hose or tubing near to the position of each valve while standing away from the engine and listening at the other end of the tube a noisy valve lash adjuster can be isolated when the engine is idling. If adjustment is properly done, then the main causes of noisy valve lash adjuster are a worn out adjuster foot and camshaft lobe or worn in or contaminated internal parts of the valve lash adjuster. For 1986 and previous models, remove the rocker arm covers and the intake manifold, then use a wrench to slacken the rocker arm nut and move the rocker arm in an anti-clockwise position to the direction of the push rod. Take out the pushrod, and if the mechanic has removed more than one, they should be arranged in a systematic manner. The lash adjuster should be removed using a special lash adjuster removal tool and extra care should be taken when handling the adjuster not to use pliers or any other tool on the outer surface of the adjuster body as this will damage the adjuster. In case the adjusters are to be used again, they have to be stacked appropriately. Clean and dry the adjusters, check for a bowing condition, uneven wear, scratching, or pitting of the cam or adjuster surfaces and replace the entire set if any adjuster is worn concave, scratched, or galled. If the adjusters are still serviceable, they can be returned to their original positions, and have to be coated with moly based grease or engine assembly lubricant. The other procedures which are normally followed are the same as the removal except that they are in reverse order. Subsequent to 1987, the VS style engine includes roller type valve lash adjusters, which work with the use of adjuster retainers and guides to stop rotation on the camshaft lobes. The process begins in a similar way with the pulling off of the rocker arm covers and the intake manifold; subsequent to that, the rocker arm nut has to be loosened and the pushrod pulled off. The valve lash adjuster guide retainer and guide must also be removed. A special lash adjuster removal tool is required here and the same remarks apply for using tools on the adjuster body. Inspection and disassembly are generally the same as the lash adjusters, but there are extra tests for the roller liberties and wear. On reinstalling the adjusters make sure they fit into their original bores and lubricate them with moly based grease or engine assembly lube as the rest of the installation process of the adjusters is a reversal of the process of removal.

Question 3

How can a noisy valve lash adjuster be isolated and what are the common causes and steps for removal and installation in 2.8L, 3.1L V6 engine on Pontiac Grand Prix?

Accepted Answer

A noisy valve lash adjuster is often possible to isolate while the engine is running but the car not moving for example with a mechanic's stethoscope or a length of hose near each valve location, listening at the other end or by removing the valve cover and touching each valve spring retainer one at a time to feel for a shock, if a lash adjuster is bad. Possible reasons for noisy lash adjusters are dirt, and lack of adequate oil flow, correct viscosity, or pressure; thus, there is need to ascertain that the oil is not contaminated with fuel, it is at the right level, clean and has correct viscosity before passing a verdict on the lash adjusters. To set up the valve cover and intake manifold, therefore, it is necessary to take off the rocker arms and pushrods and for 3100 engines to unbolt the roller lash adjuster guides to the block and should be marked for reuse. Lash adjusters can be removed employing a special tool, a magnet, or a machinist scribe but using pliers is prohibited apart from when replacing the lash adjusters. It is important to reinstall the lash adjusters where they came from, so store them in a box labeled to facilitate this, and while most blocks will have standard and oversize lash adjusters marked on them. Valve lash adjuster parts cannot be purchased individually, and if the parts are worn, they must be replaced with new ones; used lash adjusters should be placed back into their original holes and new lash adjusters should be soaked in oil, greased or coated with assembly lube before installation. The remaining steps of instalment are the reversal of the removal steps, then engage the engine and look for signs of oil leakage.

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