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CA Valve Tappets Pitted
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BlackFatbob View Drop Down
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Joined: 12 May 2016
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BlackFatbob Quote  Post ReplyReply Direct Link To This Post Topic: CA Valve Tappets Pitted
    Posted: 13 Oct 2016 at 9:05am
Hello, this is my first post at AC.  So thanks in advance for all the good technical content I have found here.

I'm in the middle of an tear down and overhaul of a 1951 CA that used to belong to my Uncle and have found that the valve tappets have some pitting on the face.
It looks to me like these these faces are hard chrome plated and I'm in a bit of a quandry as to how to proceed.  Any opinions on grinding the faces on a surface grinder to clean them up and/or resurfacing them on a valve grinder.  Or should I just punt and look a better set of tappets.

I'll post some pics tomorrow.

Thanks
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CAL(KS) View Drop Down
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Joined: 18 Sep 2009
Location: Chapman, KS
Points: 3800 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CAL(KS) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 9:11am
a camshaft grinding service can surface your tappets unless they are just terrible.  this is usually done when a camshaft is reground anyway
Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20

Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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BlackFatbob View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BlackFatbob Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 9:14am
Thanks CAL,  

Yes, my concern is that these will be through the hard chrome to clean up.  If indeed these are hard chromed as they appear.
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Dick L View Drop Down
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Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 11:13am
I have resurfaced a bunch of them and have never noticed any hard chrome.
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BlackFatbob View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BlackFatbob Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 11:28am
Hi Dick,

I was hoping you would pick up on this.    Maybe I'm being fooled by the surface finish.  Here's a pic or two
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BlackFatbob View Drop Down
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Here's another
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 86312 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 12:31pm
couple of them are a little deep.. Might be cheaper to buy a used set and pick out the best ones as compared to grinding $$.
Like them all, but love the "B"s.
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LeonR2013 View Drop Down
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Joined: 01 Jan 2013
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Points: 3500 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LeonR2013 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 1:49pm
X2
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Dick L View Drop Down
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Joined: 12 Sep 2009
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Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 7:07pm
Originally posted by BlackFatbob BlackFatbob wrote:

Here's another

I would pitch those.  It sure looks like a coating on them. You can never say never but there was no coating on any I have removed from old engines.  I have some around here someplace that are wore concave.  Those that I have resurfaced polished up like new. I wouldn't think you would want a hard chrome surface rubbing on a cast iron camshaft. I have never seen any rusted that bad either.  Take a grinder and lightly remove a small part of the area that looks like a coating and see if it changes look. Hard chrome would not be very thick.  Hard chrome will chip after it is thick at some point. I have had mold cores hard chromed but don't remember how thick it can be before it is in danger of chipping.  I had some mold cavities re-hard cored to thin the part and the build up was nickel with a flash hard chrome.    


Edited by Dick L - 13 Oct 2016 at 7:09pm
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steve(ill) View Drop Down
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Points: 86312 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 8:00pm
http://www.ebay.com/itm/Allis-Chalmers-b-rocker-arm-lifters-and-rods-/172357628005?hash=item282150b065:g:jccAAOSwH3NXnVn4
Like them all, but love the "B"s.
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BlackFatbob View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BlackFatbob Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2016 at 7:15am
Thanks Dick,  
Maybe somewhere in the middle of 1951 the factory tried some hard coated tappets.  I'll put one on the surface grinder and take light cuts and pics along the way and post them.  I guess the coating stress cracked over the years and when the engine was left open to humidity the rust got after the soft steel underneath.  Really strange though.
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BlackFatbob View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BlackFatbob Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2016 at 7:16am
Thanks Steve,

I grabbed em.  I needed one pushrod too so that's a heck of a price.

Many thanks
Dennis
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8528 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2016 at 12:44pm
For you guys resurfacing lifters,don't they have a slight convex surface to aid in spinning?
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BlackFatbob View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BlackFatbob Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2016 at 1:24pm
I was curious of that, too.  These appear to be flat and no wear signs of spinning.  
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Dick L View Drop Down
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Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2016 at 6:39pm
Originally posted by SteveM C/IL SteveM C/IL wrote:

For you guys resurfacing lifters,don't they have a slight convex surface to aid in spinning?

That is correct.  Most are flat or slightly concave when they come out of a old tractor.  
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Tracy Martin TN View Drop Down
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Joined: 11 Sep 2009
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Points: 10714 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2016 at 7:41pm
What aids them to spin is most are off center to lobe of camshaft. HTH Tracy
No greater gift than healthy grandkids!
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8528 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2016 at 11:35pm
Originally posted by Tracy Martin TN Tracy Martin TN wrote:

What aids them to spin is most are off center to lobe of camshaft. HTH Tracy

True.I'd bet they all are offset but I thought I read in performance mags that they were slightly convex.I think Dick concurred?
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cranky View Drop Down
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Points: 205 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cranky Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2016 at 7:49am
most tappets under 1" in diameter have a convex radius.the engine manufacturers list this info and any good cam shop will have a tappet grinder. tappet grinders can easily be adjusted to produce the desired radius.
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