Tight 2.0 engine
 

Hi
I got a 2.0 69 engine that is tight, almost frozen. I need a cheater bar to turn the crank. If I turn the crank 45 degrees its loose those 45 degrees, but then tightens. If I turn it around 360 degrees I can keep turning it, but it will seize again a few days later (well, I haven't timed it).

I took the engine out of a running car but I haven't driven it very long, and just one time. It has been rebuilt by someone of unknown skill. Its built of assorted parts, mag E crank case T cylinders, T cams, unknown pistons (could be E) etc.

I'm in mid teardown, it was not tight camshafts... Hopefully I get down to piston and cylinders later this week.

Could someone take a guess what the problem could be?

warped mag case binding the crank?

That is my best bet too.
But wouldn't it bind all the time or free up the whole 360 degrees once I brake it loose?

"seize again a few days later"

This tells you that the mechanical clearance is changing over time

only thing that makes that happen is an organic process

known as R U S T

Rust in cast-iron cylinders.

Possibly dry cylinders. With the cylinders up add some oil through plug holes and turn it over then reverse the side with plugs up.
Bruce

Well, I have come this far now:

http://i1037.photobucket.com/albums/...2/DSC_0481.jpg


With the cylinders gone I can turn the crank by the flywheel, just a little initial sticktion.

There was oil in the cylinders, I think from previous attempts from me to lubricate the pistons.
Cylinders don't look that good, but no major rust:
http://i1037.photobucket.com/albums/...2/DSC_0487.jpg

http://i1037.photobucket.com/albums/...2/DSC_0488.jpg

I have not even wiped of the C/P in the picture above, so they look a little messy.

I'm thinking that pistons to cylinder clearance might be to tight or that the piston rings are wrong.
I forgot to mention in my first post that the oil tank magnet was full of junk...

Think I found the problem.
The piston skirt is too tight !
I haven't the right tools to measure the pistons, but I guess the pistons aren't supposed to get stuck??
The top of the pistons fits nicely, its just the "tabs" thats tight. that is not normal is it?

http://i1037.photobucket.com/albums/...2/DSC_0492.jpg

not normal. in all my rebuilds etc, the pistons slide in and out without much effort (rings provide the friction). but i've never dealt with a 2.0.

Just checked my new P&C's in the shop (3.0), without rings, the pistons slide nicely in and out of the jugs.