hi;
if you slowly open the oil filler cap while the noise is evident it will
cease.releasing crankcase vacuum stops the crank seal lips from
"chattering".
only happens on turbos.
if you want to fix it you will need to replace the seal.
cheers,
michael m agishian
"Livolsi, Stephane" wrote:
>
> I was under the hood of the 5k earlier today still working on the idle
> and I noticed an unpleasant noise coming from the back of the engine.
> Hope someone can help me diagnose....
>
> It sounds very mechanical and metallic and dry. (sounds very similar to
> the sound a starting motor sometimes makes after it starts the car and
> the pinion gear is winding down to a stop... especially if the bearing
> is going)... and it happens as the engine revs are coming down. I
> manually move the linkage to increase rpms and when I let go this noise
> starts and only lasts a second or two. The noise does not start til
> rpms get down to around 1500 or so and as rpm's drop it goes away. It
> really sounds like its coming from the rear of the valvecover but it
> could be further down. The car is standard transmission and is obviously
> out of gear when I do this, but the clutch is not pushed in. Could it
> be a gear or bearing in the transmission? Are there any tranny
> gears/bearings moving when the tranny is out of gear but clutch is out?
> Otherwise, what could it be - rear cam or crank bearing, distributor
> gear?
>
> TIA
>
>
> Stephane Livolsi
> 180 Yorston St
> Williams Lake, BC, V2G 3Z1
> ph 250-392-2637
> fax 250-392-2693
>
> '86 5KTQ stock (if you don't know what it means, you aren't in the club)