It is not the valve itself that makes a whistling noise?
Kees Oudesluijs
Op 26-3-2012 14:05, Alan Bromfield schreef:
> My BN4 restoration is complete. I collected the car on Saturday from
> having the weather equipment made up - Tonneau and Hood - and
> trailered it home. The weather here has been glorious with blue skies
> and temperatures around of 18degrees (65F). Lovely spring weather.
> Yesterday I took it for a shake down run and was quietly impressed and
> proud with how it drove. The ride is supple yet firm, the steering is
> very positive and fairly light and the whole body shell is very solid
> with no rattles or scuttle shake. There are a few snags to address
> such as a wildly optimistic fuel gauge (shows full at 2 gallons!) and
> no movement on the temperature gauge. That will be a pain to strip out
> for repair.
> The only other major snag was a whistling noise from the front of the
> engine which I thought was the water pump or alternator bearing. I
> removed the fan belt but the squeal/whistle was still there -
> definitely from the front of the engine. I don't know why I did it,
> but when I pulled the dipstick the whistle stopped. When I put it back
> it gradually resumed.
> I finally came to the conclusion that the PCV valve, fitted exactly as
> recommended by Norman Nock in his technical topics book (Page 98), was
> the culprit. The vacuum being pulled on the crankcase at tickover
> appears to be sufficient to cause air to be drawn in past the front
> crankshaft pulley seal.
> I really want to keep the PCV as it provided real benefits when I
> fitted one to my BJ8, reducing oil mist and leaks.
> Does anyone have any advice how the suction might be reduced so that I
> don't get this noise? Could the PCV be faulty allowing too much
> suction at tickover?
> I would welcome your input.
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