Whistling sound coming from rear
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- Pushrod
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Whistling sound coming from rear
My ‘71 Beetle started to make a whistling sound. It goes away when accelerating, but returns when not. In reading some sources, this points to the clutch release bearing. Am I correct in my assumption?
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- Fuel Injection
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Re: Whistling sound coming from rear
Faulty release bearing might typically make some noise when you press the clutch pedal.
If the return spring at transmission is not broken and pedal free play set to min 25mm... then there would be no force on release bearing when pedal not pressed. Should be quiet when not touching/turning.
Loose fan belt noise would be opposite as you describe- only scream while accelerating.
If the return spring at transmission is not broken and pedal free play set to min 25mm... then there would be no force on release bearing when pedal not pressed. Should be quiet when not touching/turning.
Loose fan belt noise would be opposite as you describe- only scream while accelerating.
Staying Aircooled is so much nicer.
Do'nt assume anything- (While doing fault-finding).
Do'nt assume anything- (While doing fault-finding).
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- Pushrod
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Re: Whistling sound coming from rear
Thanks Dawie. I dropped the engine already, so I’ll make sure free play is set to min 25mm after installing everything. I’m in any case replacing the release bearing, just to eliminate that part.
- retrovan
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Re: Whistling sound coming from rear
Think the whistle would be a hole in the exhaust or gasket
Herman
Herman
1952 Split Beetle 1835cc
1968 Fastback 2Lt.type4
1972 Low Light Bay Panel Van 2Lt type 4
1975 Fleetline Panel Van 1914cc
2020 MeFusco Beetle Truck 2Lt type 4
1972 FT Hahn SP 1776 cc
1968 Fastback 2Lt.type4
1972 Low Light Bay Panel Van 2Lt type 4
1975 Fleetline Panel Van 1914cc
2020 MeFusco Beetle Truck 2Lt type 4
1972 FT Hahn SP 1776 cc
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- Pushrod
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Re: Whistling sound coming from rear
I couldn’t find any exhaust leaks, it sounds like the whistling comes from under the right hand valve cover. The other side is quiet. On inspection all seems in order. Could it be the rocker shaft?
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Re: Whistling sound coming from rear
Whistling sound when not accelerating- (part load/high inlet vacuum). Whistling disappears when accelerating- low vacuum.
Maybe inlet vacuum related in that area?
Maybe inlet vacuum related in that area?
Staying Aircooled is so much nicer.
Do'nt assume anything- (While doing fault-finding).
Do'nt assume anything- (While doing fault-finding).
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- Pushrod
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Re: Whistling sound coming from rear
Sounds worth investigating, Dawie. I’m pulling the engine again and will run it on my test stand for further diagnosis.
- retrovan
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Re: Whistling sound coming from rear
Could be a head seal, if under the tappet cover.
Or your copper exhaust seal on your header J pipe.
Herman
Or your copper exhaust seal on your header J pipe.
Herman
1952 Split Beetle 1835cc
1968 Fastback 2Lt.type4
1972 Low Light Bay Panel Van 2Lt type 4
1975 Fleetline Panel Van 1914cc
2020 MeFusco Beetle Truck 2Lt type 4
1972 FT Hahn SP 1776 cc
1968 Fastback 2Lt.type4
1972 Low Light Bay Panel Van 2Lt type 4
1975 Fleetline Panel Van 1914cc
2020 MeFusco Beetle Truck 2Lt type 4
1972 FT Hahn SP 1776 cc
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- Fuel Injection
- Posts: 2110
- Joined: Sat Sep 30, 2006 10:25 pm
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Re: Whistling sound coming from rear
You could use a small diameter flexible hose to better listen/pinpoint the source of whistle. Even while engine is still in car.
On righthand side (right when looking from behind), you can remove the right bottom plate for better access. Also listen around inlet manifold area.
On righthand side (right when looking from behind), you can remove the right bottom plate for better access. Also listen around inlet manifold area.
Staying Aircooled is so much nicer.
Do'nt assume anything- (While doing fault-finding).
Do'nt assume anything- (While doing fault-finding).
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- Pushrod
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Re: Whistling sound coming from rear
I dropped the engine and had a closer look in the general area from where the strange whistling seemed to come. This is what I found:
It looks like some oiliness/wetness around no 1 intake. Maybe I found the source of my problem in the form of an intake vacuum leak.
It looks like some oiliness/wetness around no 1 intake. Maybe I found the source of my problem in the form of an intake vacuum leak.
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- Pushrod
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Re: Whistling sound coming from rear
Some feedback for the three people still on this site. I removed the engine and ran it on my test stand, after making sure there are no leaks. I must say it’s much easier to set valve clearances on the stand. I also replaced the main seal, just because the engine was out. It’s a good thing I did, because the one I bought from Flat Four Racing recently leaked. The Viton one I got from BMG was nearly four times as much, but is much better quality. The money spent on importing a Torquemeister paid off. Took the car for a test drive and all seems well, with no whistling, except the normal one from the pea shooters.