MGB Removing the exhaust manifold on an MGB

[wkilleffer]

I've been trying to remove the exhaust manifold on my 1974 MGB to replace the manifold gasket.

The intake manifold, heat shield, and carbs are off. All the nuts are off all the studs. I've unfastened the manifold from the exhaust pipes.

Trouble is, nothing I've done gives enough clearance to get the manifold off of the last stud that's closest to the back of the car. The manifold wants to hit the steering rod. Otherwise, it would come right off.

Is it ok to cut the tip off that last stud and replace it? I have some extras, but there's always that fear that I won't be able to get the old stud out.

Any ideas or suggestions, including reading the manual, would be welcome.

Thank you,

 

[Scott_Hower]

There are long studs and short studs for an MGB manifold. The center 4 are long, the frontmost and rearmost two are short (or are supposed to be).

Have you given it a really good wiggle?

 

[PAUL161]

William, If all else fails, try loosening the left motor mount and jack the left side of the engine up a little. I had the same problem and jacking up the left side worked for me. Also Scotts right about the long and short studs. You might have a long stud where a short one should be. PJ

 

[Scott_Hower]

Have you tried to doublenut it to back it out? Spray it liberally with PBBlaster/Kroil/LiquidWrench.

 

[wkilleffer]

[ QUOTE ]
William, If all else fails, try loosening the left motor mount and jack the left side of the engine up a little. I had the same problem and jacking up the left side worked for me. Also Scotts right about the long and short studs. You might have a long stud where a short one should be. PJ

[/ QUOTE ]

Where do you put the jack? I don't want to do this and tear something up.

I'll have another look at the stud length and try wiggling it again. It may just need to be cut and replaced with the proper stud. I'm just afraid I wouldn't be able to get the wrong one out.

 

[PAUL161]

I used a block of wood on a bottle jack and jacked on the left side oil pan flange. The wood block rested on the pan bolts and did no damage to the pan. I didn't have to jack it up much. Only about an inch. Just enough to get the manifold off the stud. I put in all new studs and brass nuts. Just make sure the block is stable on the jack. PJ

 

[wkilleffer]

[ QUOTE ]
I used a block of wood on a bottle jack and jacked on the left side oil pan flange. The wood block rested on the pan bolts and did no damage to the pan. I didn't have to jack it up much. Only about an inch. Just enough to get the manifold off the stud. I put in all new studs and brass nuts. Just make sure the block is stable on the jack. PJ

[/ QUOTE ]

I sense a trip to Sears in the near future to buy a bottle jack. All I've got is a cheap auto jack from Autozone or some other such place.

 

[Scott_Hower]

I have a 3ton bottle jack from WalMart, I think I paid about $9 for it.

 

[tony barnhill]

If the last one is a stud, you have a DPO lurking about...its should be a bolt.

 

[Guest]

You can't beat a roll around floor jack for working on most anything on a car. Bottle jacks are way less stable than a good solid floor jack.

 

[PAUL161]

[ QUOTE ]
You can't beat a roll around floor jack for working on most anything on a car. Bottle jacks are way less stable than a good solid floor jack.

[/ QUOTE ]

Very true, I have two of them in my shop, but a floor jack won't go where you need it just to rock the engine up a bit. You would have to jack on the bottom of the pan. To me , that's a nono. With a small bottle jack, you can get up along side of the pan and jack on the block, using a softener of course, such as a block of wood or whatever. PJ

 

[AlanT]

Like Scott H said, just doublenut that stud (and it is a stud...bolts are on Stromberg cars) and remove it. I did this just a few weeks back on my '74BGT.

Alan T

 

[tony barnhill]

Alan - you're correct thqatits a std on early cars - sorry, my bad...however, when I went back, I'd use a bolt back there!

 

[wkilleffer]

[ QUOTE ]
Like Scott H said, just doublenut that stud (and it is a stud...bolts are on Stromberg cars) and remove it. I did this just a few weeks back on my '74BGT.

Alan T

[/ QUOTE ]

That's the plan. Wish me luck and hope there's enough room on the stud for two nuts.

Thanks,

 

[wkilleffer]

Backing the stud out was a success on the second try. Both manifolds are back on. Now, all I need is some heat shield material and some time to get it all back together.

 

[jlaird]

There ya go. Look what you learned to boot.

I know, is a pain.