Siezed 201D after rebuild

JBF203

Member
Long story short. Rebuilt a 201d for my 4500TLB. New head, inj pump, oil pump, pistons, rings, sleeves, bearings...almost all new. Machine shop installed sleeves, checked block and rods. Rebuilt the head. Crank measured good and was nice...no gouges etc. I assembled motor. Engine was tight to turn over but nothing out of ordinary...turned multiple time adjusting valves. Installed in TLB and starter made 1/4 revolution and motor is bound tight. Cant move it in either direction. This is with 4ft pry bar! Pulledc it out removed clutch and flywheel but no joy turning it. Any ideas? Rods in backwards? bearing in wrong? Only thing left on motor is PS pump. Timing issue? Timing marks are simple to follow so I don't think this is the case. I enjoy rebuilding but only once. Any help would be greatly appreciated. Thanks
 
Loosen rod bearing caps one at a time, attempting to bar motor over each time. If it doesn?t loosen up, start on the main caps.
 

If it won't roll in ether direction pull the pan and check bearings, make sure rods caps are turned correctly, main caps turned correctly, rod turned backwards isn't a good thing but shouldn't cause the engine to lock.
If it will roll in one direction pull the injectors and try the other way, if that doesn't help pull the head to see if something has got on top of a piston.
 
Putting a bearing shell in backwards is all but impossible, but putting a rod or main cap on backwards is rather easy to do. That would be my guess. First thing I'd do after you pull the pan is make sure all the rod caps have the numbers match and paired together on the same side. If that checks out, look at all the main caps and make sure the arrows point forwards. Also, you can't mix main caps either - make sure #1 is front, #2 is next, etc.
 
Hi When you put it together did you oil the bearings on the crank prime the oil pump, and lube the pistons when you put them in. maybe it's dry and seized a bearing or piston for some reason.
Regards Robert
 
If you put a bearing shell in backwards and tightened down the cap, the engine would be locked up solid on the stand. This is not what
happened here.
 
jbf,

It's not that Bern needs my concurrence with his note, he's a 100 times better mechanic than I am, but having said that, I agree completely with his post. Many years ago, I rebuilt a Chevrolet in-line six cylinder engine. I installed a couple of the rod caps backwards. I could roll the engine with a cheater on the front of the crankshaft, but when it put the engine into the car and attempted to start it with the starter, it locked up. After much examining of the engine, I found the rod caps that I had reversed. Reinstalled them and engine turned over properly.

Rod or main caps installed backwards.

Tom in TN
 
Did you assemble it with assy lube like Lubriplate 105 or something of the sort ,or dry? The first engine I overhauled with a bunch of teenaged buddies was in a neighbor's '49 Merc. We put it together dry. Last time I did that.
 

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