Hopefully nothing is damaged on the crankshaft. The issue was pretty noticable and I Immediately parked the tractor. So my next question is what happened? (Not really hypothetical causes but a physical "why is it loose?) Did the pulley slip off far enough for the key to fall out? Did the key break? Did something become unbolted? I really have no idea how the pulley is attached o the shaft and want to learn.
- Thread starter DrLarryE
- Start date
TheOldHokie
Well-known Member
- Location
- Myersville, MD
The pulley is or should be a tight slip fit on the end of the crankshaft and is held in place by a 5/8 svrew going through the face of the pulley and into the end of the crankshaft. A woodruff key in the crankshaft engages a small notch on the end if the pulley and prevents the pulley from turning on the crankshaft.
Untill you actually disassemble and inspect yours why it is loose is purely hypotheticals. Most likely the screw in the end of the crankshaft loosened allowing the pulley to pull out enough to come free of the woodruff key and rotate on the crankshaft. That causes the bore and/or crankshaft to wear and it begins to wobble.
TOH
a32vickyhotrod
Member
Have you removed the belt and inspected as to whether the pully is loose on the crankshaft or is the pully just bent? If it is just bent (most likely) you are in luck. If it is loose enough to wobble on the crank you are going to be spending some money.
Hopefully someone used a puller on the pully and bent it up.
This post was edited by a32vickyhotrod on 09/09/2022 at 08:34 am.
Richard G.
Well-known Member
The pulley on my 8N wobbled for many years when other family members owned it.
When I got it, I tightened up the bolt holding the pulley on the crankshaft.
It has not wobbled since.
Used it about 2 hours yesterday.
When I got it, I tightened up the bolt holding the pulley on the crankshaft.
It has not wobbled since.
Used it about 2 hours yesterday.
(quoted from post at 06:01:42 09/09/22) ..... So my next question is what happened?
No. Next to impossible. The key is shared by both the crankshaft pulley AND the crankshaft gear. It is "captured" by the gear. If the key was not in position, it is unlikely to run as the crank gear could rotate on the crankshaft causing a complete loss of crank / cam timing
Unlikely. If the pulley is not engaged with the key, it is more likely that the pulley bolt came loose and the pulley moved far enough out to become disengaged. Or possible I guess, that the key slot in the pulley broke.
In either of these scenarios the pulley would most likely not be turning as it could slip on the crankshaft.
My guess is that it is just loose
Certainly possible that the crankshaft pulley bolt came loose. Though with the pin drive hub engaged with the pulley, I don't think the bolt could come completely out
Doc, I stated in your previous message: Loose Belt Pulley
[i:69b4f60523][b:69b4f60523]"All these pulleys bolt onto the end of the crankshaft with a "skinny head" bolt"[/b:69b4f60523][/i:69b4f60523]
The exception to this bolt is the "ratchet" style bolt used as OEM. (without any type of hydraulic pump hub)
Here's a couple pics showing the crankshaft key
TheOldHokie
Well-known Member
- Location
- Myersville, MD
A shallow notch on the end of the pulley is all that engages the crankshaft key and the pulley only needs to back out a quarter inch or so to come free of the key. Ford never intended this to be used to deliver the horsepower needed for a hydraulic pump.
I am pretty sure the pinned hub arrangement was only used by Wagner and the pulley was originally secured using a special slotted flathead machine screw - see parts diagram. Because of the slotted drive they are often under tightened and back out.
The splined hubs will fit over a standard hex head cap screw. You just need to make sure the drive shaft is fully seated in the socket (up against the head on the bolt) and cannot back out.
TOH
TheOldHokie
Well-known Member
- Location
- Myersville, MD
Here is a little idea I came up with for getting those pulleys on nice and tight.
TOH
TOH
Ed S.
Well-known Member
- Location
- Middle Tennessee
My '50 started knocking about a year after I bought it. Expecting the worst, I pulled the hood and front beam, planning to take down the engine for a rebuild.
That's when I discovered the pulley was loose. I should have done what you did - tightened it back up and put it back together - but instead, I ended up doing a bare-metal resto on the tractor.
Which maybe wasn't such a bad thing after all.
es
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