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Valve Lever Misalignment
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- Team Cub
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Re: Valve Lever Misalignment
I would try swapping same-numbered parts to different positions to see if the alignment improves. After doing the best I could by that method, I would add shims to get contact across the full end of the valve stems. They do not have to be centered across the contact surfaces of the rockers. I would not try bending the rockers as it may disturb the orientation of the curved surfaces of the rockers, leading to an uneven contact with the valves.
- arlen
- Cub Star
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Re: Valve Lever Misalignment
Jim Becker wrote:I would try swapping same-numbered parts to different positions to see if the alignment improves. After doing the best I could by that method, I would add shims to get contact across the full end of the valve stems. They do not have to be centered across the contact surfaces of the rockers. I would not try bending the rockers as it may disturb the orientation of the curved surfaces of the rockers, leading to an uneven contact with the valves.
- arlen
- Cub Star
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Re: Valve Lever Misalignment
Jim Becker wrote:I would try swapping same-numbered parts to different positions to see if the alignment improves. After doing the best I could by that method, I would add shims to get contact across the full end of the valve stems. They do not have to be centered across the contact surfaces of the rockers. I would not try bending the rockers as it may disturb the orientation of the curved surfaces of the rockers, leading to an uneven contact with the valves.
I swapped 4 of them, and made 2 of them much better, and didn’t make any worse.
I found these shims on Amazon. There is a couple that could use .030 to .060 to make them darn near perfect.
https://www.amazon.com/gp/product/B004K ... UTF8&psc=1
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- Team Cub Mentor
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Re: Valve Lever Misalignment
Those look like they should do the job nicely. The extras are a welcome addition to the parts bin, probably come in handy, down the road.
- arlen
- Cub Star
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Re: Valve Lever Misalignment
Gary Dotson wrote:Those look like they should do the job nicely. The extras are a welcome addition to the parts bin, probably come in handy, down the road.
One thought I had, is shimming them .030 or .060 going to cause an issue with the push rods? It looks like there isn't much room for them to move in the tappets side to side, and it looks like the contact area with the tappets are flat, so I suppose they can't tolerate much of an angle. I suppose I will just have to make the final shimming decisions when the head is installed. Maybe I'll get lucky the shims will actually improve the fit with the pushrods too.
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- 501 Club
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Re: Valve Lever Misalignment
The push rods should be captured in the lifters, and have a cupped end to capture the ball end stud on the rocker arms.
A .030" shim shifting your rocker arms sideways with a 10" push rod is gonna shift the angle by .171 degree!
Very trivial amount! (As long as they dont rub in the head or block!)
(10 inch is just a guess on the push rod length!)
A .030" shim shifting your rocker arms sideways with a 10" push rod is gonna shift the angle by .171 degree!
Very trivial amount! (As long as they dont rub in the head or block!)
(10 inch is just a guess on the push rod length!)
1968 Cub Fast-Hitch
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- 501 Club
- Posts: 1853
- Joined: Wed Jan 20, 2021 8:21 pm
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- Tractors Owned: 1968 Cub Fast Hitch
LF-1 Platform Carrier
144 Cultivators
L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
CS Bell No. 60 Grain Mill on a unmodified Fast Hitch Disk hitch prong
Home Made Fast Hitch Potato Plow
54A Blade
Couple 1948 Cubs
172 Runner Planter
53 Fertilizer
Cub-3 Field Cultivator
Cub-189 Two Way Plow
Cub-22 Sickle Bar Mower
Mechanical Transplanter with side mount barrel (needs a fast hitch adapter) :)
Misc Belly Mowers
Wish List
International 100 Fast Hitch Blade
Mott Fast Hitch Flail Mower
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Fast Hitch Rotary Hoe
4E hammer mill - Location: Ne Ohio
Re: Valve Lever Misalignment
Speaking of those stainless shims on amazon.
Generally stainless is soft and not a good wear surface.
If it was me, I would want to use a precision ground, hardened shim.
Something that might be more available at your local bearing supply house or maybe mcmaster carr or msc!
Does it matter, you decide!
Generally stainless is soft and not a good wear surface.
If it was me, I would want to use a precision ground, hardened shim.
Something that might be more available at your local bearing supply house or maybe mcmaster carr or msc!
Does it matter, you decide!
1968 Cub Fast-Hitch
- arlen
- Cub Star
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Re: Valve Lever Misalignment
SamsFarm wrote:The push rods should be captured in the lifters, and have a cupped end to capture the ball end stud on the rocker arms.
A .030" shim shifting your rocker arms sideways with a 10" push rod is gonna shift the angle by .171 degree!
Very trivial amount! (As long as they dont rub in the head or block!)
(10 inch is just a guess on the push rod length!)
I see what you mean. For some reason I thought the tappet end of the push rod was flat, but I see it has a radius and can tolerate a bit of an angle.
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- Team Cub Mentor
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Kubota B8200HST-D - Circle of Safety: Y
- Location: OH West Mansfield
Re: Valve Lever Misalignment
My only concern, with the push rods, would be clearance where they pass through the head. I wouldn't worry about wear on your shims, there is virtually no side load on the rocker, you never see wear on the side of a rocker. Use them and forget about it!
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- 501 Club
- Posts: 1853
- Joined: Wed Jan 20, 2021 8:21 pm
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- Tractors Owned: 1968 Cub Fast Hitch
LF-1 Platform Carrier
144 Cultivators
L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
CS Bell No. 60 Grain Mill on a unmodified Fast Hitch Disk hitch prong
Home Made Fast Hitch Potato Plow
54A Blade
Couple 1948 Cubs
172 Runner Planter
53 Fertilizer
Cub-3 Field Cultivator
Cub-189 Two Way Plow
Cub-22 Sickle Bar Mower
Mechanical Transplanter with side mount barrel (needs a fast hitch adapter) :)
Misc Belly Mowers
Wish List
International 100 Fast Hitch Blade
Mott Fast Hitch Flail Mower
Wish Wish Wish List
Fast Hitch Rotary Hoe
4E hammer mill - Location: Ne Ohio
Re: Valve Lever Misalignment
The rocker arms are captured on the rocker arm shaft and shimming one sideways will not change the angle of their operation.
The change in angle will be the push rod.
The ball tips on the rocker arm adjusting studs are made to be forgiving of a wee bit of angle.
Since the radius is parallel with the rocker arm shaft, that is probably why IH was not too concerned if they were off a bit!
There is a cut-away view of the engine in the A & B service manual (in the manual section if you dont have a hard copy), and if you look close, you can see that the push rods are angled.
Dont forget that the radius on the rocker arm tips that contact the valves is hardened, and if anyone thinks of heating their rocker arms and bending them, you risk the chance of softening the tips which would lead to them wearing prematurely!
The change in angle will be the push rod.
The ball tips on the rocker arm adjusting studs are made to be forgiving of a wee bit of angle.
Since the radius is parallel with the rocker arm shaft, that is probably why IH was not too concerned if they were off a bit!
There is a cut-away view of the engine in the A & B service manual (in the manual section if you dont have a hard copy), and if you look close, you can see that the push rods are angled.
Dont forget that the radius on the rocker arm tips that contact the valves is hardened, and if anyone thinks of heating their rocker arms and bending them, you risk the chance of softening the tips which would lead to them wearing prematurely!
1968 Cub Fast-Hitch
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