Question about 1998 Volvo V70

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Engine started tapping is it a valve gone

Engine started tapping is it a valve gone

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Hi, if the tapping is coming from the top half of the engine then the chances are it will be one of the hydraulic lifters that operates the valves the chances of a valve been gone is pretty slim if it was a valve your car would start to miss fire.

These lifters can be replaced and it is quite a big job to do. But getting it done sooner rather than later could save you alot of money just in case it does cause a valve to break this could cause you to have a seized engine and might need new engine.

The lifters themselves might be able to be adjusted but this would need to be done by trained mechanic as it takes exact measurements to find out the right lifter to adjust and thats if their is room inside the lifters to adjust them slightly. If not then you will need to have all the lifters replaced as to get the one out you need to be able to get to all of them. Its difficult to tell for sure witch one is playing up so this is why they replace them all.

On older cars you used to be able to adjust them with spanner and screwdriver but they stopped making them like that because they was un-reliable and was always noisy so instead of a spring type valve they use hydraulic ones now witch all cant be adjusted this would need to be checked.

Let me know how you get on or if you need further assistance ok

Posted on Aug 25, 2009

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Most common problem on these is the seal around the oil pickup tube starts leaking or has broken away. Removal of the oil pan is necessary. The dealer sells a kit that has all the seals in it you will need minus the liquid gasket for the oil pan, its and anerobic sealant, DONT USE SILICONE, IT WILL LEAK

Posted on Aug 26, 2009


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2014 F350 diesel 6.7 92,000 mi. Check engine light, suddenly runs very rough when idling and loud engine knocking. Any idea of the cause?

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Ok so ik I'm posting allot haha but does anyone know where or how to adjust lifters just found out mine r just now needed adjustment in near mount Vernon WA or a price at least haha

In engines with rocker arm valve systems, the procedure I'm familiar with is to remove a rocker arm cover, and (one at a time!) while the engine is running, slowly back off the rocker arm retainer nut or bolt just until you hear the lifter tapping, then tighten it a quarter turn. If you can identify a lifter that is already tapping, tighten its rocker arm slowly until it stops tapping, then adjust it. Do not over-tighten! This can damage the engine.

Listen carefully to how the engine sounds; if it starts to stumble when you tighten a loose rocker arm, you've gone too far. If you cannot get the engine to run well without tapping, you may have too much wear in the valve train and may be due for a head overhaul, or you don't have adequate oil pressure in the lifters in question.
Repeat until all rocker arms are done. Replace the rocker arm cover using a new gasket, then (in a V-engine), repeat the procedure on the other side of the engine.

Wearing safety goggles, or better yet, a transparent face shield, is strongly recommended. Sometimes oil will squirt out a considerable distance from the lifter side of the rocker arm during adjustment, and the direction is not readily predictable.

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Sometimes valve springs can break for no reason.
You have to hear which side of the engine it is coming from.
Is coming from top, middle of engine?
The dealer will diagnose for a fee.

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