The Ford Barn

Dtolson9 · 05-29-2016, 12:46 PM

I've been told by the local model a guys I can just drop a replacement in since the cylinder isn't scored at all.

Bob C · 05-29-2016, 01:26 PM

The new piston will need to weight the same as the old one.

Bob

Dtolson9 · 05-29-2016, 04:04 PM

That's what I'm told. I need to measure this one and see what the bore is as well

chap52 · 05-31-2016, 07:40 AM

Good news that the cylinder was not damaged. Just went through a piston issue with my V8 and went ahead and replaced all the pistons. Figured I would rather do it now while I am still young enough to (70) crawl under the truck. More importantly, get back out from under the truck.
Keep us posted.

Dtolson9 · 06-05-2016, 07:33 PM

Thanks for the input guys. It's all back together and on the road.

slackcat · 06-06-2016, 07:00 AM

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Good to hear.

mshmodela · 06-06-2016, 12:54 PM

Nice to read... Great job!

chrisabes · 06-15-2016, 06:26 AM

This thread is perfect timing for me with great information. I too have an engine with a bad knock. Pulled it out today to investigate. A couple of members of the local Model A Club have suggested it could be a loose flywheel, as mentioned in a couple of earlier posts. Will know when I pull it apart in the next couple of days.

Special Coupe Frank · 06-15-2016, 06:51 AM

I'm a little late to the party, but I will chime-in for checking the cam-gear, and the plunger & spring...

My '28 had a knock at idle that sounded very much like a rod-knock... I tried the timing-pin / pressure trick, and it subsided/ disappeared.

Took the side-cover off the timimg area, and let the engine idle: cam gear/shaft was "walking" fore & aft, making a knocking sound.

(Do NOT rev the engine with the side-cover removed: your fender will be covered in oil!

)

THIS was my "bearing knock"... when I disassembled the front cover, I found the plunger flush at the top of its bore, and the spring in about 3 pieces... it was doing no good.

When I replaced the plunger and spring, and put it all back together, the "rod knock" was gone.

It's an easy thing to check...

Obviously, your case was different

... good thing you shut it down before the cylinder was damaged !

Good luck !

Frank

john in illinois · 06-15-2016, 07:06 AM

I am late to the party also,but here is good motor noise information. Glad you fixed the piston.

http://www.foxvalleymarc.com/Tech_se...ne_noises.html

John

05-29-2016, 12:46 PM	#41
Dtolson9 Member Join Date: Apr 2016 Posts: 78	Re: Ford model a knock I've been told by the local model a guys I can just drop a replacement in since the cylinder isn't scored at all.

05-29-2016, 01:26 PM	#42
Bob C Senior Member Join Date: May 2010 Location: So Cal Posts: 8,747	Re: Ford model a knock The new piston will need to weight the same as the old one. Bob

05-29-2016, 04:04 PM	#43
Dtolson9 Member Join Date: Apr 2016 Posts: 78	Re: Ford model a knock That's what I'm told. I need to measure this one and see what the bore is as well

05-31-2016, 07:40 AM	#44
chap52 Senior Member Join Date: Jun 2013 Location: Marana Arizona Posts: 1,776	Re: Ford model a knock Good news that the cylinder was not damaged. Just went through a piston issue with my V8 and went ahead and replaced all the pistons. Figured I would rather do it now while I am still young enough to (70) crawl under the truck. More importantly, get back out from under the truck. Keep us posted.

06-06-2016, 07:00 AM	#46
slackcat Member Join Date: Jul 2012 Location: Galesburg, KS Posts: 87	Re: Ford model a knock Sponsored Links (Register now to hide all advertisements) Good to hear. __________________ 1929 A Special Coupe 1926 T Speedster

06-06-2016, 12:54 PM	#47
mshmodela Senior Member Join Date: Mar 2014 Location: Cleveland, Ohio Posts: 2,763	Re: Ford model a knock Nice to read... Great job! __________________ -Mike Late 31' Ford Model A Tudor, Miss Daisy I don't work on cars --I'm learning about my Model A. Cleveland, Ohio

06-15-2016, 06:26 AM	#48
chrisabes Member Join Date: Apr 2015 Location: Tamborine Mountain,Queensland, Australia Posts: 85	Re: Ford model a knock This thread is perfect timing for me with great information. I too have an engine with a bad knock. Pulled it out today to investigate. A couple of members of the local Model A Club have suggested it could be a loose flywheel, as mentioned in a couple of earlier posts. Will know when I pull it apart in the next couple of days.

06-15-2016, 06:51 AM	#49
Special Coupe Frank Senior Member Join Date: May 2010 Location: Northeast Penna Posts: 2,108	Re: Ford model a knock I'm a little late to the party, but I will chime-in for checking the cam-gear, and the plunger & spring... My '28 had a knock at idle that sounded very much like a rod-knock... I tried the timing-pin / pressure trick, and it subsided/ disappeared. Took the side-cover off the timimg area, and let the engine idle: cam gear/shaft was "walking" fore & aft, making a knocking sound. (Do NOT rev the engine with the side-cover removed: your fender will be covered in oil! ) THIS was my "bearing knock"... when I disassembled the front cover, I found the plunger flush at the top of its bore, and the spring in about 3 pieces... it was doing no good. When I replaced the plunger and spring, and put it all back together, the "rod knock" was gone. It's an easy thing to check... Obviously, your case was different ... good thing you shut it down before the cylinder was damaged ! Good luck ! Frank

06-15-2016, 07:06 AM	#50
john in illinois Senior Member Join Date: May 2010 Location: Illinois Posts: 2,184	Re: Ford model a knock I am late to the party also,but here is good motor noise information. Glad you fixed the piston. http://www.foxvalleymarc.com/Tech_se...ne_noises.html John