(800) 853-2651
SHOP NOW

manifold studs

B

BHpony

Member
My farmall H was surging unless giving it some throttle. I knew it was manifold studs not tight enough from ten years ago when new manifold was put on. Pulled it off and half are stripped, what are my options to fix.
 
Replace all studs with new ones. When you have all studs out, make sure the head surface is flat. True up the manifold before it's re-installed, put in a new set of gaskets, tighten it with brass nuts and forget about it for the next 50 or so years.
 
Myself I would get another head. I don’t like heli coils. They have there place but not here.
 
Exactly , no option but to pull the head off and look for another head as that’s cheaper than machine shop work. But up to u if you want to spend the money those can be fixed.
 
Helicoils will work, but they must be installed straight.

Or thread inserts, but the secret is getting them in straight.

Trying to hand drill straight is near impossible without a drill guide.

A drill guide is a steel block with a known straight hole the same size as the tap drill. The block is held on with a bolt in an existing good hole. It may take more than one block to access all the holes.

Be careful to drill exactly in the center of the hole, and not go deeper, don't want to hit water!
 
(quoted from post at 14:51:00 06/19/20) My farmall H was surging unless giving it some throttle. I knew it was manifold studs not tight enough from ten years ago when new manifold was put on. Pulled it off and half are stripped, what are my options to fix.
Click to expand...

You've had some really bad lack if the holes for that many studs are stripped.

But Helicoils (properly installed) make a repair that's better than new.

DUNNO what rustred's issue is???
 
Size isn't the issue as much as "thread pitch" is.

Going to a larger size, if the thread pitch is different you have to go a LOT larger to be successful.

Helicoils keep the same thread pitch, so not as much metal needs to be drilled out to install them

IGNORE the (bad) anti Helicoil "advice" you've been given and Helicoil the thread back to the original standard size and all will be well.

(The patent has run out and you can buy a generic coiled thread repair insert kit for a LOT less than the official Helicoil kit and the inserts are the same.)
 
that is a crock. heli coils dont make it like new. i have experience with them also. and as i said by the time you get a machine shop to
install them your over the price of another head. unless u are able to do the drilling and tapping your self.
 
you can tap new threads in the head useing next larger size. then you can go to your good parts
store that sells dorman products. dorman has new studs that will have studs with the larger
threads on one end and the same threads as the old studs on the other end. hope this helps.
 
(quoted from post at 20:11:20 06/19/20) What is next size up maybe metric that i could resize with.
Click to expand...


If there is enough meat left in the hole you might get lucky tapping it out to a metric M12.

Proper and textbook perfect, of course not.

Does it work from time to time yes.
 
I was trying 3/8 replacements studs then I found out it is 7/16 . Maybe just 1 or 2 stripped. thanks for all the help. Now to find 7/16 studs with 16 thread, maybe be I have to get from tractor place instead of auto store.
 
That's what I did on a Toyota pickup engine
head stud. only I went from metric to
American which was just a little larger. I
welded a short piece of American stud to
the metric stud. I was a little worried if
it would work, because the thread depth in
the block wasn't quite as deep as it should
have been, but it held up to the torque.
 
Screw em in with jb weld like it was loctite let it sit 24 hours and they will hold if not completely stripped
 
You must log in or register to reply here.

Similar threads

S
9N exhaust manifold studs
Replies
18
Views
1K
Shadowfax419
S
D
'52 8N with manifold leak no studs just bolts
Replies
15
Views
614
douglloyd
D
F
8n head removal.
Replies
6
Views
285
wore out
wore out
B
50 8n manifold stud length?
Replies
4
Views
542
blueridge
B
M
48 B Water flowing directly into crankcase (>2 qts/min)
Replies
18
Views
932
cushman
C
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top