Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 02-12-2017, 01:15 PM   #1
taterjacksam
Junior Member
 
Join Date: Apr 2015
Location: Leesburg, Fl.
Posts: 23
Default Knocking Noise

Started my 30 Fordor and there is a knocking sound from the what sounds like the rear of the engine or bell housing. After 30 seconds noise stopped. Shut engine down and restarted and no noise. Shut engine down and waited for 15 minutes and restarted and the knock was there again, 30 seconds later no knock. I guess I need to find a Model A mechanic.
taterjacksam is offline   Reply With Quote
Old 02-12-2017, 01:19 PM   #2
Mitch//pa
BANNED
 
Join Date: May 2010
Location: Bucks County, PA
Posts: 11,454
Default Re: Knocking Noise

First ck the oil.. if it persists try it without the belt.. noises can radiate from the source
Mitch//pa is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 02-12-2017, 01:26 PM   #3
taterjacksam
Junior Member
 
Join Date: Apr 2015
Location: Leesburg, Fl.
Posts: 23
Default Re: Knocking Noise

I did check oil, it's full.
taterjacksam is offline   Reply With Quote
Old 02-12-2017, 01:53 PM   #4
Patrick L.
Senior Member
 
Patrick L.'s Avatar
 
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
Default Re: Knocking Noise

Removing the belt is a good idea. I suggest trying to exactly locate the noise. There are quite a few things that can make noise at the rear of the engine/bellhousing area.
Patrick L. is offline   Reply With Quote
Old 02-12-2017, 01:56 PM   #5
Cool Hand Lurker
Senior Member
 
Cool Hand Lurker's Avatar
 
Join Date: May 2010
Location: So Minn
Posts: 1,565
Default Re: Knocking Noise

Just thinking, but it could be a bad valve or worn bearings. Try putting it in gear and letting out the clutch a little to put a load on the crankshaft. If the noise changes it could be a bearing. If not then it might be a valve. If a noise disappears after 30 seconds it indicates that oil drained away from a worn area when the engine stopped and then worked back into the worn area after 30 seconds of engine running.
Cool Hand Lurker is offline   Reply With Quote
Old 02-12-2017, 02:09 PM   #6
taterjacksam
Junior Member
 
Join Date: Apr 2015
Location: Leesburg, Fl.
Posts: 23
Default Re: Knocking Noise

Sponsored Links (Register now to hide all advertisements)
I just restarted and got outside and the noise is at the rear of the engine best I can tell. The noise went away shortly after starting it took 20 - 30 seconds and it was gone.
taterjacksam is offline   Reply With Quote
Old 02-12-2017, 02:10 PM   #7
Mitch//pa
BANNED
 
Join Date: May 2010
Location: Bucks County, PA
Posts: 11,454
Default Re: Knocking Noise

Does moving the clutch pedal change anything?
Mitch//pa is offline   Reply With Quote
Old 02-12-2017, 02:25 PM   #8
taterjacksam
Junior Member
 
Join Date: Apr 2015
Location: Leesburg, Fl.
Posts: 23
Default Re: Knocking Noise

I'll have to wait for a while to try clutch just tried and no noise too soon.
taterjacksam is offline   Reply With Quote
Old 02-12-2017, 02:35 PM   #9
GregLast
Member
 
GregLast's Avatar
 
Join Date: Nov 2010
Location: Oklahoma City, OK
Posts: 83
Default Re: Knocking Noise

I had a knock once and it was the ring gear that had slipped on the flywheel a bit, and was hitting the casing. Hammered it back into place gently and it's stayed put ever since...no more knock.
GregLast is offline   Reply With Quote
Old 02-12-2017, 03:35 PM   #10
Ed in Maine
Senior Member
 
Join Date: May 2010
Location: Washington Cty., ME or Flagler Cty., FL
Posts: 1,106
Default Re: Knocking Noise

It could be piston slap. My Town Sedan would knock (Cluck) on startup and the noise would just melt away after 30 seconds after the oil got up into the cylinder. I was careful to keep the rpms low on startup. I drove the car 5000 miles and never had to fix it! Ed
Ed in Maine is offline   Reply With Quote
Old 02-12-2017, 05:53 PM   #11
taterjacksam
Junior Member
 
Join Date: Apr 2015
Location: Leesburg, Fl.
Posts: 23
Default Re: Knocking Noise

I did try a couple of things that were asked. I started the engine after a while and the knock noise started, pressed the clutch and no difference in sound, let out on clutch in gear and no sound difference. Knock noise stopped after about 20 - 30 seconds as usual. Hopefully it will be what you had Ed. I will get in touch with local Model A Club and see where to take the care to be looked at. Thank you for the responses.
taterjacksam is offline   Reply With Quote
Old 02-12-2017, 06:19 PM   #12
Cool Hand Lurker
Senior Member
 
Cool Hand Lurker's Avatar
 
Join Date: May 2010
Location: So Minn
Posts: 1,565
Default Re: Knocking Noise

You could also run a compression check to see if there is any difference in the cylinders.
Cool Hand Lurker is offline   Reply With Quote
Old 02-12-2017, 06:20 PM   #13
Mitch//pa
BANNED
 
Join Date: May 2010
Location: Bucks County, PA
Posts: 11,454
Default Re: Knocking Noise

Sounds like having your club look at it is a good idea.. keep us posted
Mitch//pa is offline   Reply With Quote
Old 02-12-2017, 08:21 PM   #14
George Miller
Senior Member
 
George Miller's Avatar
 
Join Date: May 2010
Location: NC
Posts: 2,975
Default Re: Knocking Noise

Sounds like a center main to me. Try shorting out the center plugs while it is knocking. If it reduces it or it goes away you found it. It wont be that loose, just needs adjusting.
George Miller is offline   Reply With Quote
Old 02-20-2017, 02:23 PM   #15
taterjacksam
Junior Member
 
Join Date: Apr 2015
Location: Leesburg, Fl.
Posts: 23
Default Re: Knocking Noise

George I did what you suggested and the knock almost completely disappeared. I have sent an email to the local club but haven't heard from anyone yet. The noise still goes away on its own after 30 seconds or so.
taterjacksam is offline   Reply With Quote
Old 02-20-2017, 05:02 PM   #16
George Miller
Senior Member
 
George Miller's Avatar
 
Join Date: May 2010
Location: NC
Posts: 2,975
Default Re: Knocking Noise

Glade you found it. It goes away because the oil gets in there and cushions it. It will keep getting worse the more you drive it. You should be able to remove some shims and get the right clearance.
George Miller is offline   Reply With Quote
Old 02-21-2017, 12:10 AM   #17
SSsssteamer
Senior Member
 
SSsssteamer's Avatar
 
Join Date: Nov 2010
Location: Sedro-Woolley, WA
Posts: 1,023
Default Re: Knocking Noise

Quote:
Originally Posted by Ed in Maine View Post
It could be piston slap. My Town Sedan would knock (Cluck) on startup and the noise would just melt away after 30 seconds after the oil got up into the cylinder. I was careful to keep the rpms low on startup. I drove the car 5000 miles and never had to fix it! Ed
Ditto!
SSsssteamer is offline   Reply With Quote
Old 02-21-2017, 12:32 AM   #18
Tom Wesenberg
Senior Member
 
Tom Wesenberg's Avatar
 
Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
Default Re: Knocking Noise

Piston slap or center main are the main things I can think of. My 29 engine had the center main babbit completely gone, and it made a very loud rattle at any speed over idle.

My 28 engine has piston slap, and it's a lighter ticking noise that never goes away due to the amount of slop.
Tom Wesenberg is offline   Reply With Quote
Old 06-10-2017, 06:25 AM   #19
taterjacksam
Junior Member
 
Join Date: Apr 2015
Location: Leesburg, Fl.
Posts: 23
Default Re: Knocking Noise

Follow-up

After weeks of searching for a mechanic that could and would work on my engine its in the shop. The mechanic called yesterday and asked me to stop by. When he dropped the pan there were aluminum pieces in the pan. They were not shavings but small pieces. There were no shims on any of the main caps. Since it was Friday he didn't want to take the caps off until Monday morning the see were the pieces came from. Any ideas I can fret over for the weekend??
taterjacksam is offline   Reply With Quote
Old 06-10-2017, 07:02 AM   #20
Big hammer
Senior Member
 
Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,114
Default Re: Knocking Noise

No fretting over the weekend, wait until you hear/see about the bearings :-)
__________________
Don't force it with a little hammer tap, tap, tap
get a bigger hammer tap done
Big hammer 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 12:50 AM.