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JD B Knock

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CTex

12-16-2002 16:39:54

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I have a 46 B. Just went in and put in new pistons with wrist pins. I have a loud knock when I idle it down. It is near the camshaft or governor area. I used plastigauge on the rods and main bearings. Both are now at .002. Still I have the knock actually it sounds like something hitting but only on a slow idle or just as it winds down to die. I have been all through the clutch area and nothing is loose.I just tightend the flywheel by sliding it in, could it be pulled too far over which could pull the crank out of line and allow it to be hitting something every so often?

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Dave K (Fl)

12-17-2002 14:47:12

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Re: JD B Knock in reply to CTex, 12-16-2002 16:39:54

I developed a similiar problem in my 1948 Model A after I bought it. It had recently been ovehauled by the previous owner. I doubt this is your problem, at least not for the same reason. Whoever put the engine together used cap screws on the cam gear that were too long and added nuts on the ends. After a lot of troubleshooting, including pulling the head, pistons etc I found that a couple of these nuts were polished from hitting (or being hit by)the rod cap on that side. I removed the nuts and screws, installed correct cap screws on the cam gear with lock washers under the head. Voila, problem solved! I have found when you have an unknown knock that sounds more like something hitting something else then look for polished or scratched surfaces and work from there.

Dave

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Ron

12-16-2002 19:32:51

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Re: JD B Knock in reply to CTex, 12-16-2002 16:39:54

I hesitate to ask this, but---are you hearing the Mag Impulse coupling engage, as the engine is about to stop.??? Our "B" will knock at slow idle, unless the flywheel is TIGHT... I mean...200lbs on the John Deere wrench.... not a bit less... Well, I guess ours does have some knocking at slow idle-always has, since it was bored to +.180....in 1960...checked it all out, found nothing...been that way for 42 years....!!!! Has MORE power than my 520, too...!!!

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Ron

12-16-2002 19:29:12

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Re: JD B Knock in reply to CTex, 12-16-2002 16:39:54

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Clooney

12-16-2002 17:21:15

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Re: JD B Knock in reply to CTex, 12-16-2002 16:39:54

CTex, how much backlash do you have in the governor to cam gear, or cam to crank gear? Excess play in those gears will give a knock on shutdown. You could have a crank throw bumping the cam gear but probably not only at low idle [something to check though]. Are the cam bearings in good condition & tight? ~How much crankshaft end play do you have? [should be .005"-.010"], if excessive you could have potential for noise there.
~Is the flywheel & clutch driver tight? Does the noise get worse with the clutch dis-engaged? If so suspect a loose flywheel or clutch driver.
~You are going to have to eliminate the obvious first, then go for the more obscure things...

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CTex

12-16-2002 17:51:59

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Re: Re: JD B Knock in reply to Clooney, 12-16-2002 17:21:15

I checked the end play in the Cam no more then .003. The cam bearings I checked and Both fit nice and tight. The flywheel and clutch driver are both tight. Flywheel end play is right at .008. I checked the bearings and gears on the governor as well. Even though it seems to work o.k. could the governor be hitting something when it slows down? What about the gear on the fan shaft and the governor gear? Would they be more noisy during slow down?

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