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Head to Manifold studs

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Head to Manifold studs
#1
  This topic is about my 1962 MG MGA MkII
tnmcleod Avatar
tnmcleod Silver Member Thomas McLeod
Sharpsburg, MD, USA   USA
1962 MG MGA MkII "Jane"
OK, I give up!
I have searched and cannot find a "DEFINITIVE" answer as to the question: Where can I find quality head to manifold studs for my Mk2.
They are 5/15 24 on both ends (measured). Two if them (outside) are 1 1/2 inches long with 1/2 inch of thread on the head end and 3/4 inch on the manifold end.
The other four are same diameter and thread but 1/4 in longer overall. I am amazed that a 5/16 bolt will not take 25 lb-ft. of torque.
On reassembling my intake I broke one stud and come to find that they were all stretched, either over-torqued by a previous owner or defective.
I also notices the mention of the spec being wrong in the manual for the MGA as the same part for the MGB uses 15 lb-ft. 15 seem pretty light to me.

Thanks in advance,

Tom

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oleanderjoe Avatar
oleanderjoe Gold Member Joseph Baba
Fresno, CA, USA   USA
THOMAS: Never had a problem with the ones from MOSS. I used to stock at least three dozen. JUST ME, but the OUTER most holes on the Exhaust Manifold I would change out the studs for 5/16" Gr 8 Bolts. The rest of the studs. "Mechanic Tight" Cheers


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ghnl Avatar
ghnl Silver Member Eric Russell
Mebane, NC, USA   USA
1961 MG MGA "Calvin"
Moss has them listed. #5 are the shorter studs, #6 are the longer studs. https://mossmotors.com/mga/engine-performance/cylinder-head-2#6

When needed, I'll make them by starting with a partially threaded bolt of the appropriate length. Cut off the head and use a die to cut new threads. Best to start with it a little long then cut it down to the desired size.



Eric Russell ~ Mebane, NC
1961 MGA #61, 1981 Alfa Romeo GTV6, 1984 Alfa Romeo Spider, 1991 Honda ST1100

Tbird Avatar
Tbird ET Taylor
Land O Sky, NC, USA   USA
Same problem here but not sure whom the vendor was on the replacement studs - it's been a few years.
Broke 2 - 3? before I gave up.
Replaced with the originals and they worked fine using 25 ft/lbs - still on there.

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bisslre Ron Bissland
Kenosha, WI, USA   USA
1956 MG MGA 1500 "The Little Car"
1979 MG MGB
2014 Chevrolet Silverado
Got mine from Todd Clark.. any time I want the best.. I call Todd..

bobs77vet Avatar
bobs77vet bob K.
northern Va, VA, USA   USA

Basil Adams Avatar
About 12 miles from Sears Point, CA, USA   USA
I have them in stock. Call or email. Basil 707.762.0974 basiladams@yahoo.com



Basil C. Adams
1956 MGA Coupe (Show Car)
1957 MGA Roadster (Driver)
1958 MGA Coupe (Racecar)
1959 MGA Coupe (unrestored)
1960 MGA Coupe (unrestored)
1960 MGA Roadster (Driver)
MKIII Elva Courier (E1056)
1967 427 Cobra
1972 Alfa Romeo Montreal
A coupla late MGBs
1960 Austin Healy BN7
More Cars than Brains

Rob Z Avatar
Rob Z Silver Member Rob Zucca
Camarillo, CA, USA   USA
1960 MG MGA
Torqued mine up to 25. Tried anyway. Broke one. Replaced them all and torqued to 15 as specified for the MGB. Just snug them up mechanic tight as Joseph and Hap say.
I have not seen an answer yet why the MGA manual says 25 and MGB says 15. It’s pretty much the same assembly.



"Time flies like an arrow......Fruit flies like a banana"

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ozieagle Avatar
ozieagle Gold Member Herb Adler
Geelong Victoria, Australia   AUS
1958 Wolseley 1500 "Wooly"
1966 MG MGB "Bl**dy B"
Whatever studs or bolts you get make sure that you use some sealant on the threads into the head, as these holes go all the way into the engine, and can leak oil.

Herb



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tnmcleod Avatar
tnmcleod Silver Member Thomas McLeod
Sharpsburg, MD, USA   USA
1962 MG MGA MkII "Jane"
Thanks for the input guys. I did some more snooping an I could not find a reputable source that recommends any more than 20 Lb-Ft. for a 5/16 bolt or stud.
I guess the 15 Lb-Ft recommended by the "B" manual is about right.

Basil,
I found some close to home. Thanks!

Tom

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malcox Avatar
malcox Silver Member Malcolm Cox
Napa, CA, USA   USA
BTW, you can also use non-damaging, high temp, all metal locknuts
I got mine from McMaster-carr
https://www.mcmaster.com/#94820a240/=1byheoo

Malcolm

barneymg Avatar
barneymg Barney Gaylord
(Somewhere in USA), Pick one (or more), USA   USA
1958 MG MGA "MGA With An Attitude"
The reason for the 15-lb-in torque spec was because it originally used brass nuts for the manifold.



Barney Gaylord - 1958 MGA with an attitude - http://MGAguru.com - barneymg@mgaguru.com

oleanderjoe Avatar
oleanderjoe Gold Member Joseph Baba
Fresno, CA, USA   USA
BINGO: Every one forgot about that HUH, ??????


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Gary E Avatar
Gary E Silver Member Gary Edwards
Kernersville, ,N.C., USA   USA
Just buy grade 8 studs from Fastenal.



Gary

Speedracer Avatar
Speedracer Platinum AdvertiserAdvertiser Hap Waldrop
Greenville, SC, USA   USA
1967 MG MGB Racecar "The Biscuit"
In reply to # 3696727 by tnmcleod Thanks for the input guys. I did some more snooping an I could not find a reputable source that recommends any more than 20 Lb-Ft. for a 5/16 bolt or stud.
I guess the 15 Lb-Ft recommended by the "B" manual is about right.

Basil,
I found some close to home. Thanks!

Tom

Who torques a stud? Screw it in until snug, then back off a 1/4 turn. None of this really matter on this application, because it is low torque deal and a torque wrench needs to no where near these studs.



Hap Waldrop
Acme Speed Shop
864-370-3000
Website: www.acmespeedshop.com
hapwaldrop@acmespeedshop.com


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