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What's that screeching noise?

Posted by Podalane51

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What's that screeching noise? #1
Podalane51 Lane Poole Burleson, Texas, USA	Posted: April 08, 2012 09:06PM Registered: 1 year ago Posts: 11

Pulled the carb and manifold off of the 1800 and replaced the side panel gaskets. When I put it all back together, there's this screeching noise coming from the front of the engine. Not the water pump or the alternator. Vacuum leak? Any ideas?

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Re: What's that screeching noise? #2
joels55 Joel Slavick Billings,MT., USA 1964 MG MGB 1969 MG MGB GT "Franken B" 1978 MG MGB	Posted: April 08, 2012 09:12PM Registered: 3 years ago Posts: 248

Roger,did you pull the exhaust loose too,wondering if it's an exhaust leak. did you use a new intake/exhaust gasket at the head? also could be the dougnut gaskets at the down pipes coming off the exhaust manifold. Joel

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Re: What's that screeching noise? #3
Podalane51 Lane Poole Burleson, Texas, USA	Posted: April 08, 2012 09:20PM Registered: 1 year ago Posts: 11

Yeah, Joel, I took all that loose. Maybe I should tighten it up some. My catalytic converter is nothing more than a tube due to all the insides rotting out, but I don't think that has anything to do with it. I'll check my exhaust. Thanks, Joel.

Edited 1 time(s). Last edit at 04/08/2012 09:36PM by Podalane51.

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Re: What's that screeching noise? #4
ClayJ Clay Johnston Mt. Olive, MS, USA 1972 MG MGB	Posted: April 08, 2012 09:41PM Registered: 7 years ago Posts: 7,362

Lane,
Quick check, remove the belt and see if the noise disappears.

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Re: What's that screeching noise? #5
rrmgb robert schau Reston, VA., USA 1973 MG MGB 1973 MG MGB	Posted: April 08, 2012 09:53PM Registered: 6 years ago Posts: 8,984

Clay X2

"It is a mistake to try to look too far ahead. The chain of destiny can only be grasped one link at a time."
Sir Winston Churchill
---------------------------------------------------------------
"It all starts in your mind's eye, then it goes to your heart
and finally to your very soul."
G.S.George PHD

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Re: What's that screeching noise? #6
Podalane51 Lane Poole Burleson, Texas, USA	Posted: April 08, 2012 10:14PM Registered: 1 year ago Posts: 11

Yep, took the belt off and still makes the noise. Thanks, Clay

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Re: What's that screeching noise? #7
ClayJ Clay Johnston Mt. Olive, MS, USA 1972 MG MGB	Posted: April 08, 2012 11:00PM Registered: 7 years ago Posts: 7,362

Lane,
Does the screeching sound like a rubbing noise or hissing like a vac leak?

Front of the engine you say? Might try locating the noise with a length of rubber hose held to the ear.

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Re: What's that screeching noise? #8
Basil Adams About 12 miles from Sears Point, USA	Posted: April 09, 2012 01:45AM Registered: 6 years ago Posts: 5,983

Spray the belt with WD40 while it's screeching and see if it goes away.

Basil C. Adams
1956 MGA Coupe (Show Car)
1957 MGA Roadster (Driver)
1958 MGA Coupe (Racecar)
1959 MGA Coupe (unrestored)
1960 MGA Coupe (unrestored)
1960 MGA Roadster (Driver)
MKIII Elva Courier (E1056)
1967 427 Cobra
1972 Alfa Romeo Montreal
A coupla late MGBs
1960 Austin Healy BN7
More Cars than Brains

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Re: What's that screeching noise? #9
Podalane51 Lane Poole Burleson, Texas, USA	Posted: April 09, 2012 09:03AM Registered: 1 year ago Posts: 11

It's not the belt. I took it off and ran the engine and still the noise. It's not a hiss. It sounds like something is rubbing, but nothing is evident. I used a stethoscope and still can't seem to locate the problem.

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Re: What's that screeching noise? #10
Shofine Litch Litchfield Sequim, Washington, USA	Posted: April 09, 2012 10:18AM Registered: 3 years ago Posts: 11

I had a similar experience when I rebuilt my 67 MGB engine; the squeal was intermittent (not constant) and sounded like a bearing squeeling from lack of lubrication. The cause: I had accidentally replaced the "vented oil filler cap" with a later model non-vented cap (they look very similar). This caused a vacuum in my oil sump created by the PCV valve which is connected to intake manifold vacuum. I believe in my case, the air was sucking in past the rear main bearing. Remove your oil filler cap and see if the screeching stops. -- Litch (Shofine)

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Re: What's that screeching noise? #11
johnbaz john biggs sheffield, england, United Kingdom	Posted: April 14, 2012 04:53AM Registered: 4 years ago Posts: 36

Hi

The clutch release bearing can make a screeching sound when it's lost all the grease and is running dry, I know it's actually behind the engine but if your ears are anything like mine (worked in a heavy foundry for 33 years) then it'll be hard to tell the difference confused smiley

Hope you get it sorted thumbs up

Cheers, John smiling smiley

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Re: What's that screeching noise? #12
Podalane51 Lane Poole Burleson, Texas, USA	Posted: April 14, 2012 08:23PM Registered: 1 year ago Posts: 11

Here is the conclusion of this topic: I pulled that metal heat shield off of the first and second manifold bolts, reattached the manifold, and "Voila"- the noise is gone. I pulled all that environmental junk off of the engine, and man does it hum! Thanks to all who contributed.

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