Apparently the engine is seized, but given how cherry everything else looks here, this seems like a great project... Check out more pics and details here.

 

Wow that is something unusual, as you don't see very many in that kind of condition, after 45 years. Wow.

Jack

 

How much do you think an engine rebuild will run on this?

 

That's like asking how long is a string. In this case it depends on who does the rebuilding.

There are two types of seized engines: the ones that sat for too long and the ones that overheated for lack of oil. The former? Most of the time they can be brought back with patience and PB Blaster. The latter? A certifiable boat anchor. By the time that they seize the head may be so warped that you are better off finding a new engine.

Not the gentlest of ways but remove sparks, shove PB Blaster, let it sit for a few days before trying to turn it with a breaker bar. Repeat as needed. Once unstuck shove oil down the spark plug holes, turn by hand several times. Next connect the battery (no spark plugs) and turn the engine with the starter motor. Remove the head cover, make sure none of the valves are stuck. After that change the oil, put the spark plugs back, and see if it will fire up. Plan B would be to remove the head and gently heat the pistons and also gently tap them with a rubber mallet.

The biggest concern is that you are not trying to run the engine with a stuck valve. The second biggest concern is scratching the cylinder walls. Shoving oil on the spark plugs and cranking the engine a few times *should* free them up.

I personally believe that it is better to fog an engine than to turn it on every few months or God forbid once a year. Cranking a dry engine would cause more wear and tear.

 

Beautiful example. Love the color of course.

 

Not much at all when you look at the value of the car. It's a 4.2L common to 420G, and 420 saloon so plenty of them around even if the original is beyond repair.

 

My 4.2 looks like it would slot in there just perfect. I'm sure my XJ6 wouldn't mind losing an engine to share the shed with this.
Another Peninsula Jag engine is just up the road to sort the XJ.