Locked U20 5 speed and carbs

[mschel]

Hi, looking for some advice.

I just picked up a U20/5speed/and I thought it had solex but I think one maybe says weber?.

Everything is locked up including the linkages on carb.

U20 I am wondering if any special process with the jackshaft setup. In the past with other engines I would use some mix of ATF/Diesel/Acetone in each cylinder and let is sit for a while and also probably soak the top end with similar. I would also remove locked starter and locked fuel pump. Water pump is locked and was open to elements. It had rusted headers so critters might have come in that way too. Worried about messing up the multiple chains trying to free it up.

The carb shafts are locked. Soak with standard solvents like PB blaster or is there a better way? I do have a small ultrasonic cleaner. Just not sure what the bushings are made of so want to be careful not to eat anything up there or internally.

The 5 speed is also locked up and doesn't shift at all. That one I am worried I will cause damage internally if I am not careful. Any tips?

Thanks.

[DAC21]

Yikes, sounds like you may need a money tree in the backyard.

[mschel]

Tried to plant a money tree but it died

I am interested in learning about how the u20 goes together honestly. I have a nicer U20 that's partly torn down but some bolts etc are awol. So worst case it goes to fix that. Best case this one turns over with work and some time.

The weber intake might also be nice to have. Not sure how those run vs the stock carbs.

Yikes, sounds like you may need a money tree in the backyard.

[theunz]

If it was me, I would just disassemble everything for a thorough inspection and cleaning. That’s the only way to really know what you have.

[Gregs672000]

I have no experience, but with that said I'd start by putting the carbs in a vat of Evaporust... won't hurt or corrode anything. With the amount of rust, there's little hope that the cylinder bores are not heavily damaged IMHO. I would just go ahead and pull the head, or stick a bore scope in the plug holes and see what you can. If it's OK, I'd soak it with whatever you have typically used. The chains won't be a problem.

Looks like it has a 7 quart pan on it? Hard to tell, but if so ($$$). Be nice to it. The intake manifold is not a solex manifold but looks like something that was welded up... will need inspection to see how well it was done. It may have a B cam, and that could be worth something if in good shape along with the rockers (number them if you remove them as they are wear matched to the cam). The carbs... well, you can get decent replacements for not too much money, and unless those clean up really well I'd question their worth but I may be completely wrong. Let's see what they look like after a day or two of soaking.

[mschel]

Very true. I think I am watching too many of those youtube channels where they show up and get old locked up engines running.

Worst case, yeah its a good learning exercise.

If it was me, I would just disassemble everything for a thorough inspection and cleaning. That’s the only way to really know what you have.

[mschel]

Good to know on the evaporust. I didn't realize that was good for carbs too.

I wish the head gaskets were cheaper on these!

Interesting on the oil pan. i thought it looked different than usual. What do those go for?

Was hoping it was a solex manifold but good to know on the custom work. Will take that all off first and post some pics for comments.

I should probably search but is there a stamping on the cam to look for to determine B cam without taking it apart?

I have no experience, but with that said I'd start by putting the carbs in a vat of Evaporust... won't hurt or corrode anything. With the amount of rust, there's little hope that the cylinder bores are not heavily damaged IMHO. I would just go ahead and pull the head, or stick a bore scope in the plug holes and see what you can. If it's OK, I'd soak it with whatever you have typically used. The chains won't be a problem.

Looks like it has a 7 quart pan on it? Hard to tell, but if so ($$$). Be nice to it. The intake manifold is not a solex manifold but looks like something that was welded up... will need inspection to see how well it was done. It may have a B cam, and that could be worth something if in good shape along with the rockers (number them if you remove them as they are wear matched to the cam). The carbs... well, you can get decent replacements for not too much money, and unless those clean up really well I'd question their worth but I may be completely wrong. Let's see what they look like after a day or two of soaking.

[mschel]

.

[mschel]

See my other posting on making gaskets (except head gasket of course)

Good to know on the evaporust. I didn't realize that was good for carbs too.

I wish the head gaskets were cheaper on these or would just tear into it.


Interesting on the oil pan. i thought it looked different than usual. What do those go for?

Was hoping it was a solex manifold but good to know on the custom work. Will take that all off first and post some pics for comments.

I should probably search but is there a stamping on the cam to look for to determine B cam without taking it apart?

I have no experience, but with that said I'd start by putting the carbs in a vat of Evaporust... won't hurt or corrode anything. With the amount of rust, there's little hope that the cylinder bores are not heavily damaged IMHO. I would just go ahead and pull the head, or stick a bore scope in the plug holes and see what you can. If it's OK, I'd soak it with whatever you have typically used. The chains won't be a problem.

Looks like it has a 7 quart pan on it? Hard to tell, but if so ($$$). Be nice to it. The intake manifold is not a solex manifold but looks like something that was welded up... will need inspection to see how well it was done. It may have a B cam, and that could be worth something if in good shape along with the rockers (number them if you remove them as they are wear matched to the cam). The carbs... well, you can get decent replacements for not too much money, and unless those clean up really well I'd question their worth but I may be completely wrong. Let's see what they look like after a day or two of soaking.

[redroadster]

When the 1st tool boxes with roller bearings drawers came out ( 6 bearings per side on slide and drawer)
I wanted one so bad , I met a guy selling something on CL ,he had one
He said he wished he hadn't got it ,the reason ? He thought the bearings were lubed well , but most of the 84 bearings rusted up in his shed from the humidity soup here $400 for all new ones and took much time to replace

[theunz]

Ha, ha good point about the YouTube videos being misleading. They never mention how well they ran or for how long, just that they started and drove. Lots to go wrong on a really stuck engine, broken rings, wiped out bearings, bent valves, etc.
That definitely looks like the comp oil pan figure at least $800 if in very good condition. The B cam has a, you guessed it, B stamped on the rear of it.
Show us better pictures of that intake manifold when you get the carbs off. Very interested to see if it’s homemade or an aftermarket, as I’m unaware of any aftermarket U20 Solex intakes.

[Doggggboy]

Good to know on the evaporust. I didn't realize that was good for carbs too.

About the only thing they recommend to avoid is magnesium.

[jhayden]

Very interested to see if it’s homemade or an aftermarket, as I’m unaware of any aftermarket U20 Solex intakes.

Neither was I until very recently:

https://www.datsunrestorationproducts.c ... water-tube

And, it is welded up: the first pic can be magnified to reveal that, and note the lack of water pipe fittings. Those are 40DCOE rather than the 45s.

Jon

[david premo]

That is for sure a homemade intake manifold, you can see where it is welded together. Very short runners, which sacrifices low end power.
Dave

[Gregs672000]

The engine looks like it was exposed to salt water or stored near the ocean/beach.