MGExp

MGB & GT Forum

Strange Sound in Engine

Moss Motors
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor

Topic List Forum List Newer Older Start New Topic
Strange Sound in Engine
#1
  This topic is about my 1970 MG MGB MkII
hsisodia Avatar
hsisodia Hersh Sisodia
Ithaca, NY, USA   USA
Sign in to contact
1970 MG MGB MkII "Esmeralda"
2005 Mini Cooper
There seems to be a strange higher pitch sound emanating from the engine. I can't figure out what it could be, perhaps the water pump? Listen to the sound file.

https://drive.google.com/open?id=0B6oniH6shm9gV3Ria3BIWGlTY2c


Cheers!
Hersh

Reply
Was this post helpful or interesting?
Yes No Thank
. Become a Supporting Member to hide this ad & support a small business
Re: Strange Sound in Engine
#2
dickmoritz Avatar
dickmoritz Platinum Member Dick Moritz
Philly 'burbs, PA, USA   USA
Sign in to contact
Hard to tell from the recording, but try removing the fan belt to see if the noise goes away...

Dick


Errabundi Saepe, Semper Certi
(Often wrong, but always certain)

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#3
Chalky Avatar
Chalky David White
Coventry, Warwickshire, UK   GBR
Sign in to contact
1979 MG MGB GT
There's a trick mechanics use when trying to track down noise. If you put one end of a rod on a part and the other end against your head near your ear you'll hear the sound coming from the part a lot louder than the other sounds. This can help isolate the source.
Obviously you need to be careful about doing this. It only works on static objects, not belts and pulleys. I have a 24" long screwdriver I use.

I would suspect slipping fan belt, alternator bearings or water pump.



Edited 1 time(s). Last edit at 2017-04-30 03:55 PM by Chalky.

Reply
Was this post helpful or interesting?
Yes No Thank
. Become a Supporting Member to hide this ad & support a small business
Re: Strange Sound in Engine
#4
Rod H. Avatar
Rod H.
Amity, OR, USA   USA
Sign in to contact
1964 MG MGB
1968 MG MGB GT
It sounds lower pitch than what I've heard from the belts, but removing the belt as Dick suggests is right on. It sounds like it could be an alternator bearing, and of course removing the belt will stop that noise!

Sound recordings of engine noises are really tough to identify!


Friends talking around a fire is the history of mankind.

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#5
hsisodia Avatar
hsisodia Hersh Sisodia
Ithaca, NY, USA   USA
Sign in to contact
1970 MG MGB MkII "Esmeralda"
2005 Mini Cooper
The Alt is new about a year or so old. If i remove the belt and the Alt will not spin, then how can i verify if it's the Alt?


Cheers!
Hersh

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#6
dickmoritz Avatar
dickmoritz Platinum Member Dick Moritz
Philly 'burbs, PA, USA   USA
Sign in to contact
If the sound goes away when you remove the belt, spin both the alternator and the water pump by hand. If one or the other is bad you should feel looseness or roughness. Couldn't tell from the audio clip, but you could also have belt squeal...

Dick

In reply to # 3501113 by hsisodia The Alt is new about a year or so old. If i remove the belt and the Alt will not spin, then how can i verify if it's the Alt?


Errabundi Saepe, Semper Certi
(Often wrong, but always certain)

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#7
hsisodia Avatar
hsisodia Hersh Sisodia
Ithaca, NY, USA   USA
Sign in to contact
1970 MG MGB MkII "Esmeralda"
2005 Mini Cooper
Thanks Dick! I'll try this in a few days ones the weather improves in Michigan and we get some Sun.


Cheers!
Hersh

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#8
Basil Adams Avatar
Basil Adams Platinum Member
About 12 miles from Sears Point, CA, USA   USA
Sign in to contact
All good ideas. To me it sounds like the fan hitting the fan shroud. Is that possible? I sure hope that's not a bad lifter! Basil 707.762.0974 basiladams@yahoo.com


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

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#9
hsisodia Avatar
hsisodia Hersh Sisodia
Ithaca, NY, USA   USA
Sign in to contact
1970 MG MGB MkII "Esmeralda"
2005 Mini Cooper
Basil - i have a new electric fan that comes on only when temp reaches above 180F. So it's not the fan.


Cheers!
Hersh

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#10
tbarker7815 Avatar
tbarker7815 Tom .
Knoxville, TN, USA   USA
Sign in to contact
1979 MG MGB Limited Edition (LE)
Sounds like a lifter to me, but my hearing is not all that great.

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#11
spikemichael Avatar
spikemichael Platinum Member Michael Caputo
Canton, IL, USA   USA
Sign in to contact
1973 MG MGB "Freebie"
1973 MG MGB
1974 MG MGB "Spike"
1976 MG MGB "Cecil"    & more
Water Pump, Alternator, Belt squeal or tiny exhaust leak.
Remember what it sounds like when you let air out of a balloon slowly by pinching the sides of the neck of the balloon and pulling apart? When you start to get an exhaust leak it can whistle out the crack and drive you crazy looking for the source.


Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.


Member Services:
2024 MGB & GT Calendar www.mgbcalendar.com
Please send photos for next year's calendar to photos25@mgbcalendar.com. If you need help with your Weber downdraft carburetor, feel free to call me at 978-249-5760, USA, Central Time!
Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#12
Surewood Chuck S
Wallingford, CT, USA   USA
Sign in to contact
To me, it sounds like a very dry bearing in the alternator. If it is the alternator, it sounds bad enough that it should be obvious when you remove the belt and spin it by hand.

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#13
GMB3 Avatar
GMB3 George Badger
Soquel, CA, USA   USA
Sign in to contact
1965 Jaguar E-Type Coupe "1QUICK E"
1968 MG MGB "1QUICK B"
Is your smog pump still on the car and connected by a belt?


---
GEO

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#14
hsisodia Avatar
hsisodia Hersh Sisodia
Ithaca, NY, USA   USA
Sign in to contact
1970 MG MGB MkII "Esmeralda"
2005 Mini Cooper
No smog system connected​.


Cheers!
Hersh

Reply
Was this post helpful or interesting?
Yes No Thank
Re: Strange Sound in Engine
#15
GMB3 Avatar
GMB3 George Badger
Soquel, CA, USA   USA
Sign in to contact
1965 Jaguar E-Type Coupe "1QUICK E"
1968 MG MGB "1QUICK B"
Have you spun your ancillaries without a belt yet?


---
GEO

Reply
Was this post helpful or interesting?
Yes No Thank
Topic List Forum List Newer Older Start New Topic

To reply or ask your own question:

or

Registration is FREE and takes less than a minute

Forums  

Having trouble posting or changing forum settings?
Read the Forum Help (FAQ) or contact the webmaster





Join The Club
Sign in to ask questions, share photos, and access all website features
Forum List
MGB & GT MG Midget Buy, Sell & Trade Vendor Market MG Performance MG Engine Swaps Factory Correct MGA MGC MG Magnette 1100 & 1300 T-Series & Prewar EV Conversion Modern MG MG Motorsports Events & Meetup MG 2024 Katy Texas Other Vehicles Off Topic Clubs Archived
Your Cars
1949 MG TC
Maurice Tapiero   CAN
1949 TC
Text Size
Larger Smaller
Reset Save