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Head stud length

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Head stud length
#1
scudrunner Avatar
scudrunner Jay Nichols
La Marque, TX, USA   USA
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1952 MG TD "Lost To Hurricane Ike"
1967 MG MGB "Let Go For MGTD In 1974"
1973 MG MGB "A Work In Progress"
1974 MG MGB "Jay's 74 MGB"
Putting the head back on the block, my #2 stud is very tall and the rocker cover won't fit over it. I'm pretty sure I marked all the studs but for some reason this one sticks out. So the questions is which stud in the torquing sequence it the tall one? None of the diagrams show which are the 4 1/2" and 6 1/4". All the others seem to fit properly.


Jay in La Marque, Galveston Texas.
In God we Trust. All others bring data.
Trust, but Verify

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Re: Head stud length
#2
ghnl Avatar
ghnl Eric Russell
Mebane, NC, USA   USA
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1961 MG MGA "Calvin"
The four tall studs are the ones that pass through the rocker shaft pedestals (#s 2, 3, 6, 7). All the others are shorter.

The front & rear smaller dia studs for the rocker shaft pedestals are longer than the middle two. The longer studs there are for securing the rocker cover.


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


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Cyl Head Torque.jpg    40.6 KB
Cyl Head Torque.jpg

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Re: Head stud length
#3
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scudrunner Jay Nichols
La Marque, TX, USA   USA
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1952 MG TD "Lost To Hurricane Ike"
1967 MG MGB "Let Go For MGTD In 1974"
1973 MG MGB "A Work In Progress"
1974 MG MGB "Jay's 74 MGB"
In reply to # 4788777 by ghnl The four tall studs are the ones that pass through the rocker shaft pedestals (#s 2, 3, 6, 7). All the others are shorter.

The front & rear smaller dia studs for the rocker shaft pedestals are longer than the middle two. The longer studs there are for securing the rocker cover.

Thanks Eric, that's what I thought. But my #2 stud is taller than the other 3. I'm wondering if I got some gunk down there. I'll have to work on that.


Jay in La Marque, Galveston Texas.
In God we Trust. All others bring data.
Trust, but Verify

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Re: Head stud length
#4
ClayJ Avatar
ClayJ Silver Member Clay Johnston
Mt. Olive, MS, USA   USA
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1972 MG MGB
Possibly the stud was not fully inserted? Normal process is to run the stud down until it bottoms then back off 1/4-1/2 turn.

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Re: Head stud length
#5
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ghnl Eric Russell
Mebane, NC, USA   USA
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1961 MG MGA "Calvin"
Debris, mangled threads or even liquids (oil or coolant) in the stud hole can prevent it from fully threading in.


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

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Re: Head stud length
#6
scudrunner Avatar
scudrunner Jay Nichols
La Marque, TX, USA   USA
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1952 MG TD "Lost To Hurricane Ike"
1967 MG MGB "Let Go For MGTD In 1974"
1973 MG MGB "A Work In Progress"
1974 MG MGB "Jay's 74 MGB"
In reply to # 4788863 by ghnl Debris, mangled threads or even liquids (oil or coolant) in the stud hole can prevent it from fully threading in.

Threads were galled, ran a conical fine wire brush down the threads, sprayed with WD-40 and cleaned out, installed another stud to make sure it was clean and got it all put back together. Head and valve tappets are installed but not torqued yet.


Jay in La Marque, Galveston Texas.
In God we Trust. All others bring data.
Trust, but Verify

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  ghnl thanked scudrunner for this post
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