TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

Allis Chalmers	Case	Farmall IH	Ford 8N,9N,2N	Ford
Ferguson	John Deere	Massey Ferguson	Minn. Moline	Oliver

John Deere Tractors Discussion Forum

1946 A Knock ????

Welcome Guest, Log in or Register

Author

1946 A

10-03-2005 10:21:25

Report to Moderator

Just bought this 1946 A and am checking it out...changing oils etc. The seller said he purchased it from someone who overhauled it and installed new aluminum pistons....headwork etc.He has only used it for a few parades.
I found it has a noticeable knock at idle that goes away as the speed increases.
I have checked so far:
* Flywheel is tight.
* Correct rod bearing clearance.
* Correct tappet clearance.
* Good oil flow to tappets.
* Good oil pressure.
* Tractor indeed has new aluminum pistons.
Is this just the inherant sound out of the old "A's" or is there some thing else to look for?
Any information would be appreciated.

[Log in to Reply] [No Email]

Leroy

10-03-2005 16:20:30

Report to Moderator

Re: 1946 A Knock ???? in reply to 1946 A , 10-03-2005 10:21:25

If the flywheel is not quite tight up against the case-bearing so the crank can move even the slightest sideways it will cause a knock, that is why the closed flywheel models have that big nut on left end of crankshaft to do this tightening with and tighten that nut till you can't turn the engine over

[Log in to Reply] [No Email]

F-I-T

10-03-2005 16:58:39

Report to Moderator

Re: 1946 A Knock ???? in reply to Leroy, 10-03-2005 16:20:30

I wouldn't do that at all.

You should set that flywheel endplay to .005-.010" engine warm, no closer. You tighten it up that tight and you may cause a problem with a bind at the left main bearing when it gets hot.

Frank

[Log in to Reply] [No Email]

Mike M

10-04-2005 04:53:29

Report to Moderator

Re: 1946 A Knock ???? in reply to F-I-T, 10-03-2005 16:58:39

Your right on Frank. I knew a person did that to a late B (ran with no end play) and screwed up the crank gear.

[Log in to Reply] [No Email]

Leroy

10-04-2005 05:26:40

Report to Moderator

Re: 1946 A Knock ???? in reply to Mike M, 10-04-2005 04:53:29

I should have added tighten then back off just enough to turn free like with a wheel bearing but to me the is just so common I did not think to add it. Just ment that the end play has to be out or it will cause a knock.

[Log in to Reply] [No Email]

Mike M

10-03-2005 12:01:51

Report to Moderator

Re: 1946 A Knock ???? in reply to 1946 A , 10-03-2005 10:21:25

Here are some other things I've seen over the years. Wrist pin bushing loose in rod,clutch driver loose splines,rod journal out of round (even a slight amount can make some noise),had one once that the rods were changed in and for some odd reason 1 was bumping the top of the case when running.Very hard to find this one but went away after we ground some more clearance for it I think from the top of the case. Do some careful listening with a screwriver to your ear.

[Log in to Reply] [No Email]

1946 A

10-03-2005 13:14:54

Report to Moderator

Re: 1946 A Knock ???? in reply to Mike M, 10-03-2005 12:01:51

Thanks for the ideas....I'll have to go through each one until I find it....Oh well I have more time than money.

[Log in to Reply] [No Email]

forgot cam bearing

10-03-2005 12:03:00

Report to Moderator

Re: 1946 A Knock ???? in reply to Mike M, 10-03-2005 12:01:51

Forgot to add that the LH cam bearing on the A's likes to go bad too.

[Log in to Reply] [No Email]

F-I-T

10-03-2005 11:29:48

Report to Moderator

Re: 1946 A Knock ???? in reply to 1946 A , 10-03-2005 10:21:25

You might want to lift the crank against a zeroed dial indicator and see what sort of main clearance you have. Check on both sides. Maybe remove each spark plug wire while knocking to see if it goes away when spark is removed. If so, that's the side. Then you can plan your next move.

"A"s generally run pretty smooth, so I would not say a knock is an inherent sound.

Frank

[Log in to Reply] [No Email]

1946 A

10-03-2005 13:09:18

Report to Moderator

Re: 1946 A Knock ???? in reply to F-I-T, 10-03-2005 11:29:48

When I remove the flywheel side plug wire the sound softens quite a bit. I have not done a main bearing job so it looks like I'll have to do some reading to see what that entails. Thanks

[Log in to Reply] [No Email]

Mike M

10-03-2005 15:28:19

Report to Moderator

Re: 1946 A Knock ???? in reply to 1946 A, 10-03-2005 13:09:18

Just for reference the one I had to grind clearance in the case for was the LH one and I think it had insert type rods put in it. It wouldn't hit when turning by hand only when running. You should be able to take off the top cover and look at the wrist pin bushings and maybe see if one slipped out or has alot of play.

[Log in to Reply] [No Email]

Walt in Jaxn Tn.

10-03-2005 21:00:21

Report to Moderator

Re: 1946 A Knock ???? in reply to Mike M, 10-03-2005 15:28:19

1946 "A" Post a photo of your tractor please, is it a hand start or electric? --Walt--

[Log in to Reply] [No Email]

1946 A

10-04-2005 05:30:16

Report to Moderator

Re: 1946 A Knock ???? in reply to Walt in Jaxn Tn., 10-03-2005 21:00:21

Tractor has Electric start and Powr-Trol

[Log in to Reply] [No Email]

Mike M

10-04-2005 07:12:05

Report to Moderator

Re: 1946 A Knock ???? in reply to 1946 A, 10-04-2005 05:30:16

Just also remembered those models also had some problems with the cam gear loosening on the cam.

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home | Forums

Copyright © 1997-2023 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy