Valve seat condition

The Cub Club -- Questions and answers to all of your Cub related issues.
Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
pett3227b
Cub Star
Cub Star
Posts: 62
Joined: Tue Nov 27, 2018 7:28 am
Zip Code: 28327

Valve seat condition

Postby pett3227b » Fri Feb 25, 2022 9:46 am

Should I have the valve seats on my block cleaned up by a machinist? I have tried to upload pics of the valve seats themselves but am having some problems with the computer so I have decided to just describe them for now. I took a wire wheel on my angle grinder after removing all the old carbon there are a lot of pits. most are the size of a pin head. There are lots of them. they are many in the area that makes the actual contact with the valve face. I figured this may be enough for someone to tell me if I need them cleaned up by a machinist or not. Let me know and Thank-you

tst
10+ Years
10+ Years
Posts: 4623
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: Valve seat condition

Postby tst » Fri Feb 25, 2022 10:20 am

seats to be clean and smooth, no pits so they need to be reground to make them that way and if the pitting is to deep seats need replacing, check valve guides and guides for wear also, pull the valve up about and inch out of the guide and see how much "sideways" play it has

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 19593
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: Valve seat condition

Postby Eugene » Fri Feb 25, 2022 10:46 am

You are asking a question that cannot be answered without a hands on visual inspection.

You may be able to rent a valve seat grinder.

My guess is that if the valve seats are pitted, you will need additional engine work. So, perhaps take the disassembled engine to a machine shop.
I have an excuse. CRS.

SamsFarm
501 Club
501 Club
Posts: 1338
Joined: Wed Jan 20, 2021 8:21 pm
Zip Code: 44410
Tractors Owned: 1968 Cub Fast Hitch
LF-1 Platform Carrier
144 Cultivators
L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
Fast Hitch CS Bell 60 Grain Mill
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 seat condition

Postby SamsFarm » Fri Feb 25, 2022 2:56 pm

Get a quote for repair with someone doing the work.......

Then price a valve seat cutter for your application, plus the few items listed below.

Plus you'll need one of those suction cup valve lap gizzy, and some clover valve lapping compound!

Then dicide if you want to pay to have it done or buy some tools and do it yourself

inairam
5+ Years
5+ Years
Posts: 2283
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
1975 with woods 42-6 12 v - Horse
1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: Valve seat condition

Postby inairam » Sat Feb 26, 2022 7:41 am

Here is a post I made when I did my top end. It lists some tools I used. viewtopic.php?f=1&t=93111&hilit=valve+keeps+valve+keeps.

It is not hard to clean the block top and valve area to at least see what you have. Just use soft material light scotch bright or other nonsteel abrasives. I had the valves ground and the head ground flat at an engine machine shop and did the reassemble myself after cutting the valve seats with a Newway cutter hand tool.
When you only have 9 horsepower you need to know the names of all of the ponies!

Stevetractor
5+ Years
5+ Years
Posts: 219
Joined: Wed Apr 08, 2015 1:03 pm
Zip Code: B0v1a0
Tractors Owned: 1952 Farmall Cub
1955 Farmall Cub
1968 International Cub

Re: Valve seat condition

Postby Stevetractor » Sun Feb 27, 2022 4:00 pm

Lapping used valves and seats a bandaid at best. Have the valves and seats ground. If there is much wear in the guides and valve stems, replace with new. Lap new or ground valves to seats upon assembly.

pett3227b
Cub Star
Cub Star
Posts: 62
Joined: Tue Nov 27, 2018 7:28 am
Zip Code: 28327

Re: Valve seat condition

Postby pett3227b » Tue Mar 01, 2022 2:38 pm

I did the test with each valve at a 1 inch height above the seats to see how much play they have. They feel pretty tight. There is a little bit of wiggle I am wondering how to know what is marginal, good or bad. I also learned that i should look at each stem and the insides of the guides for scoring I will do that and see what I got. Thankyou

SamsFarm
501 Club
501 Club
Posts: 1338
Joined: Wed Jan 20, 2021 8:21 pm
Zip Code: 44410
Tractors Owned: 1968 Cub Fast Hitch
LF-1 Platform Carrier
144 Cultivators
L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
Fast Hitch CS Bell 60 Grain Mill
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 seat condition

Postby SamsFarm » Tue Mar 01, 2022 3:41 pm

pett3227b wrote:I did the test with each valve at a 1 inch height above the seats to see how much play they have. They feel pretty tight. There is a little bit of wiggle I am wondering how to know what is marginal, good or bad.


The service manual probably has the minimum / maximum specifications for the valve stem and the valve guide diameters.

I dont have mine handy and am too lazy at the moment to enably cookies, log in again and go look at the one in the manual section here! :)

SamsFarm
501 Club
501 Club
Posts: 1338
Joined: Wed Jan 20, 2021 8:21 pm
Zip Code: 44410
Tractors Owned: 1968 Cub Fast Hitch
LF-1 Platform Carrier
144 Cultivators
L-F194 Plow(s)
F38 Disk
L-F3 Spring Tooth Harrow
Fast Hitch CS Bell 60 Grain Mill
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 seat condition

Postby SamsFarm » Tue Mar 01, 2022 3:44 pm

Stevetractor wrote:Lapping used valves and seats a bandaid at best. Have the valves and seats ground. If there is much wear in the guides and valve stems, replace with new. Lap new or ground valves to seats upon assembly.


If the valve stems and guides are within spec, I would not replace them just because the seats need work!

User avatar
Bill V in Md
10+ Years
10+ Years
Posts: 972
Joined: Sun Feb 02, 2003 6:51 pm
Zip Code: 21228
Tractors Owned: 1948 Farmall Cub
LT1045 Cub Cadet
Circle of Safety: Y
Location: MD, Catonsville

Re: Valve seat condition

Postby Bill V in Md » Tue Mar 01, 2022 4:48 pm

Below is the specification page for the engine valves from the Blue Ribbon Service Manual GSS-1007 ENGINE. This manual is available under Service Manuals in Quick Links (upper left of this page).
GSS-1007 Engine 4-22-55 pg15.pdf
(360.46 KiB) Downloaded 70 times
Bill VanHooser
Circle of Safety

Stevetractor
5+ Years
5+ Years
Posts: 219
Joined: Wed Apr 08, 2015 1:03 pm
Zip Code: B0v1a0
Tractors Owned: 1952 Farmall Cub
1955 Farmall Cub
1968 International Cub

Re: Valve seat condition

Postby Stevetractor » Tue Mar 01, 2022 7:23 pm

A machinist once told me if you gently slide your finger nail along the stem and it catches an edge, chuck them. Your nail is pretty sensitive. Also with labour nowadays, new valves vs grinding, probably not a big difference.


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: No registered users and 2 guests