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Car Forum / Volvo Cars / July 2006

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960 (1995) 3L engine noise.

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ian - 27 Jun 2006 23:51 GMT
Hi;

I have the sound of a badly adjusted tappet coming from the B6304 3L
engine.
When listened to inside the car it sounds like the old air compressors
on the old lorry's. This noise is drowned out as one drives off, but is
very noticable when parked and the engine idles.
I doubt its the tappets as they are unadjustable? as when I listen to
the injectors they sound quite noisey when listened too via a long
screwdriver on each.
I suspect that this is why I am getting the Lambda light on wiith a 314
code (Cam shaft sensor).
If I clear the fault, it come straight back on.

I plan to disconnect each injector in turn to see if that will give me
a clue.

Any suggestions as to why to go to from here?

Regards
Ian
Peter K L Milnes - 29 Jun 2006 03:05 GMT
Well check the camshaft sensor if that is what the codes suggest.

All the best, Peter.

700/900/90 Register Keeper,
Volvo Owners Club (UK).

> Hi;
>
[quoted text clipped - 17 lines]
> Regards
> Ian
Mike F - 05 Jul 2006 13:07 GMT
> Hi;
>
[quoted text clipped - 17 lines]
> Regards
> Ian

The noise and code are probably not related.  If the cam sensor is dead,
the engine will not start.  One of the tappets (aka lifter) has
collapsed.  Inside each tappet is a one way valve that allows oil in,
but not out (oil does and should leak out very slowly) to keep zero
clearance and quiet valves.  This check valve either fails or gets a
piece of something in it, allowing the oil to leak out, and high
clearances and noise result.

Signature

Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

 
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