Solex U20 intake stuck - can’t remove it from head

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19692000survivor
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Solex U20 intake stuck - can’t remove it from head

Post by 19692000survivor » Fri Mar 01, 2019 12:38 am

Problem removing my Solex intake and carbs from a U20. I removed the top intake bolts - no problem until I tried to get to the bottom bolts access is pretty tight. Decided to unbolt the header hoping to help and got the front. Removed the front wheel and starter to get the back. I expected to rubber hammer lightly and pry once loose but it’s not budging. Soaked the top studs with PB Blaster tonight and try again tomorrow. Any secrets or pry points that someone knows of? Every point looks pretty flush with out obvious pry point for removal. Solvent or tricks? I just don’t want to damage anything. Thanks Rick

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Nissanman
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Re: Solex U20 intake stuck - can’t remove it from head

Post by Nissanman » Fri Mar 01, 2019 4:36 am

TIME and LUBRICANT and a GENTLE leverage should do the trick.
There is a gasket between the manifold and the head and it will part company under GENTLE pressure.
Nissanman, just trying to help.
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2mAn
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Re: Solex U20 intake stuck - can’t remove it from head

Post by 2mAn » Fri Mar 01, 2019 6:57 am

Are you sure you got all of the nuts from the blind area?
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Re: Solex U20 intake stuck - can’t remove it from head

Post by jrusso07 » Fri Mar 01, 2019 8:52 am

There are 14 nuts securing the intake and exhaust manifolds - both manifolds are on the same manifold gasket.

Rust can form on the head studs.

You can break the webbing on the manifold gasket with gentle tapping of th mnifold toward the block with the rubber mallet. The broken webbing will allow the gasket to separate with part stuck to block and part stuck to manifold

additional thought is corrosion at the coolant ports might be holding it tight. You can remove water tube and have a look at passage cleanliness.
Joe

1969 SRL311 - Solex
1970 SPL311 - U20 mod
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Gregs672000
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Re: Solex U20 intake stuck - can’t remove it from head

Post by Gregs672000 » Fri Mar 01, 2019 10:23 am

Remove the carbs first if you have not.
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Re: Solex U20 intake stuck - can’t remove it from head

Post by 19692000survivor » Fri Mar 01, 2019 11:19 am

I have removed all the nuts the 2 on the outer side front and back were the hard ones to get to. That allowed the header to slide forward but not out of the car due to the length of the studs into the head so if all the nuts are off releasing the header and the top 4 nuts are off the intake it should only be contacted to the head by corrosion in the intake ports the studs and the gasket intself - right? I have tapped it with a rubber mallet but it is really stuck as if I haven’t removed any bolts. I left the carbs on if all is unbolted what benefit would carb removal give me? Thanks for any help I did split the gasket on the exhaust ports and PB Blasted all the studs again.

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Re: Solex U20 intake stuck - can’t remove it from head

Post by jrusso07 » Fri Mar 01, 2019 1:15 pm

Recommend removing carbs as Greg said. Get them out of the way and protect them from damage. Nissan manual wants carbs off before manifold. It will give you more room to move around and see. And a lot lighter to handle.
Joe

1969 SRL311 - Solex
1970 SPL311 - U20 mod
1970 SRL311

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Re: Solex U20 intake stuck - can’t remove it from head

Post by 19692000survivor » Sun Mar 03, 2019 3:17 pm

I finally got it off with a lot of PB Blaster and a couple of days soaking. The top 4 studs were what was holding it due to rust. Thanks for all the suggestions. Rick