Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 07-17-2018, 11:25 PM   #1
lurk
Junior Member
 
Join Date: Feb 2018
Posts: 21
Default ‘39 Merc light grinding sound through shifter

Thanks to you guys, I solved an annoying acceleration issue in this low-mile ‘39 Merc. I’ve been packing miles on it the past few days and i’m impressed with how smooth the car operates generally...but there is ONE THING...(isn’t there always?)

I’m getting a light grinding noise that radiates through the shifter. If I grab the shift knob tightly, I dampen the sound to something barely audible. It does it in neutral and in all gears including reverse.

When I press the clutch in it gets VERY slightly louder, but not much.

The transmission shifts effortlessly and the action is one of the smoother manual transmissions I’ve ever had in any car. It’s an OG ‘39 transmission with 33k miles on it, so that part doesn’t really surprise me. I drained the old oil and replaced it with the correct weight GL-1 (I forget the exact weight at the moment, but it was recommended here)

Anybody have any experience with this? Pilot bushing? Starter gear not disengaging?

Any help appreciated.
Thanks.
Attached Images
File Type: jpg 5743D4F6-358A-4BB7-8A1A-C7FE5B1E8656.jpg (71.5 KB, 27 views)

Last edited by lurk; 07-18-2018 at 09:55 AM.
lurk is offline   Reply With Quote
Old 07-18-2018, 03:14 AM   #2
fordscript
Senior Member
 
fordscript's Avatar
 
Join Date: May 2010
Location: Oamaru, New Zealand
Posts: 393
Default Re: ‘39 Merc light grinding sound through shifter

Lurk, I think you are experiencing something that all Fords with a floorshift do. The length of the shift lever is acting like an antenna in reverse, and transmitting noise into the cab of the vehicle. This is why column shift cars are quieter. I discovered this years ago when I had a super quiet 46 ford that the trans blew up in. I was unable to find at the time, a replacement column change box, and instead put in a floorshift 39 box. The difference in noise was very noticeable. Also, the ends of the shifter forks that run in the grooves of 1st gear and the 2nd-3rd synchro were originally white-metalled, and this wears off, also adding to the noise. Interesting that you changed the oil, did it only start to make the noise after you changed it....or was it making it before?
fordscript is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 07-18-2018, 06:56 AM   #3
rockfla
Senior Member
 
rockfla's Avatar
 
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 1,266
Default Re: ‘39 Merc light grinding sound through shifter

Open the top of the transmission and pour a can of STP in it. You think it shifts smooth now and it will be super quiet!! My dad has done this for years on all of our V8's and WWII Jeeps!!!
rockfla is offline   Reply With Quote
Old 07-18-2018, 07:02 AM   #4
rockfla
Senior Member
 
rockfla's Avatar
 
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 1,266
Default Re: ‘39 Merc light grinding sound through shifter

Love your Merc by the way!!! Not hard to see why though. Ours is a three time Rouge un-restored and Oct of 38 production.
Attached Images
File Type: jpg Image (4).jpg (91.7 KB, 19 views)
rockfla is offline   Reply With Quote
Old 07-18-2018, 07:29 AM   #5
oldskool
Senior Member
 
oldskool's Avatar
 
Join Date: May 2010
Location: shirley ny
Posts: 860
Default Re: ‘39 Merc light grinding sound through shifter

could be throw out bearing going, remove inspection cover and see if bearing is touching the clutch fingers if so adjust clutch linkage so bearing has a little clearance there
oldskool is offline   Reply With Quote
Old 07-18-2018, 07:42 AM   #6
lurk
Junior Member
 
Join Date: Feb 2018
Posts: 21
Default Re: ‘39 Merc light grinding sound through shifter

Quote:
Originally Posted by fordscript View Post
. Interesting that you changed the oil, did it only start to make the noise after you changed it....or was it making it before?
It was making it before. The reason I dug in at all honestly was the noise. If it isn’t a catastrophic issue, I’m not very concerned with it. Other than the noise, there isn’t really a negative symptom related to it.

Thanks.
lurk is offline   Reply With Quote
Old 07-18-2018, 07:44 AM   #7
lurk
Junior Member
 
Join Date: Feb 2018
Posts: 21
Default Re: ‘39 Merc light grinding sound through shifter

Quote:
Originally Posted by rockfla View Post
Love your Merc by the way!!! Not hard to see why though. Ours is a three time Rouge un-restored and Oct of 38 production.
Nice car! How did you find out when it was produced?
lurk is offline   Reply With Quote
Old 07-18-2018, 07:52 AM   #8
alanwoodieman
Senior Member
 
Join Date: May 2010
Location: upstate SC
Posts: 1,980
Default Re: ‘39 Merc light grinding sound through shifter

next time it is making the noise, move/ slightly rotate the shifter a little and see if that changes the noise, had a trans with a worn shifter pin that did that, caused a vibration because of the worn pin
alanwoodieman is offline   Reply With Quote
Old 07-18-2018, 08:21 AM   #9
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 10,011
Default Re: ‘39 Merc light grinding sound through shifter

The shifter lever isn't much different that holding a rod against a component and listening to the other end for noise. It is firmly seated in the shift tower. If it gets slightly noisier when the throw out bearing is in play then that is a separate problem. It could be a bearing going bad in the transmission or in the drive line. Cars that set up for a long time can get corrosion pitting in the bearings where moisture or air makes contact. If it continues or gets worse then it's talking to you and trying to let you know.
rotorwrench is offline   Reply With Quote
Old 07-18-2018, 08:33 AM   #10
Hoop
Senior Member
 
Hoop's Avatar
 
Join Date: May 2010
Location: Jacksonville FL
Posts: 1,007
Default Re: ‘39 Merc light grinding sound through shifter

Rockfla's dad puts STP on his pancakes. Swears it works.
__________________
"Remember that when it comes to intelligence, half of all of us are below average."
Hoop is offline   Reply With Quote
Old 07-18-2018, 08:42 AM   #11
19Fordy
Senior Member
 
19Fordy's Avatar
 
Join Date: May 2010
Location: Coral Springs FL
Posts: 7,015
Default Re: ‘39 Merc light grinding sound through shifter

Try using GL-4 instead of GL-1.
19Fordy is offline   Reply With Quote
Old 07-18-2018, 08:57 AM   #12
rockfla
Senior Member
 
rockfla's Avatar
 
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 1,266
Default Re: ‘39 Merc light grinding sound through shifter

Quote:
Originally Posted by lurk View Post
Nice car! How did you find out when it was produced?
Lurk
All the glass is "bugged" 10-38, it came with Ford/Mercury hub caps which ran for about 3 weeks after start of production....Production started the last week or so in September. There are several "minor" differences on the early cars.

Last edited by rockfla; 07-18-2018 at 09:41 AM.
rockfla is offline   Reply With Quote
Old 07-18-2018, 09:52 AM   #13
lurk
Junior Member
 
Join Date: Feb 2018
Posts: 21
Default Re: ‘39 Merc light grinding sound through shifter

Interesting. Here my glass “bug.” 5-39
Attached Images
File Type: jpg 67316AF9-6CCC-45BA-8A96-C51DA23A1B67.jpg (25.4 KB, 16 views)
lurk is offline   Reply With Quote
Old 07-18-2018, 10:04 AM   #14
rockfla
Senior Member
 
rockfla's Avatar
 
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 1,266
Default Re: ‘39 Merc light grinding sound through shifter

Lurk
So its a good indicator yours is mid year car. By this time in production it could be May to Early June depending on the time schedule from when the glass was produced to when the car was built.....I would imagine that "early" on in production the "bug" date was pretty well on as the production date as the rush to get them out on the car lots and the need to have materials to quickly get the cars out!!!! If you go on my profile I have a few more pictures of our Merc in my photo album.
rockfla is offline   Reply With Quote
Old 07-18-2018, 12:03 PM   #15
cmbrucew
Senior Member
 
cmbrucew's Avatar
 
Join Date: Dec 2010
Location: North of sandy ago, CA.
Posts: 1,762
Default Re: ‘39 Merc light grinding sound through shifter

Re: ‘39 Merc light grinding sound through shifter Rockfla's dad puts STP on his pancakes. Swears it works.



I use nothing but MMO on mine.
Bruce
__________________
Works good
Lasts long time
cmbrucew is offline   Reply With Quote
Old 07-18-2018, 12:28 PM   #16
rockfla
Senior Member
 
rockfla's Avatar
 
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 1,266
Default Re: ‘39 Merc light grinding sound through shifter

Lurk
What's your body # ???
rockfla is offline   Reply With Quote
Old 07-18-2018, 05:27 PM   #17
pooch
Senior Member
 
pooch's Avatar
 
Join Date: Sep 2010
Location: South Coast NSW Australia
Posts: 2,595
Default Re: ‘39 Merc light grinding sound through shifter

I modified the main shafts to not leak and run synthetic GL4.
pooch is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 12:48 AM.