64 3020 gas engine is locking up

[bv]

I took a 64 model 3020 gas in on trade not running so I put a hot battery on it and I believe the starter needs some attention then I took the flywheel cover off to be sure the engine was free and it will turn 3/4 round before locking up so I removed the spark plugs and took valve cover off and the valves are free and the inside of engine is clean, the oil is good a little dirty but no signs of anti freeze and the radiator is full of anti freeze, I even unhooked the hydraulic pump coupler at front and still same results, this tractor has been sitting for 2 years I was told and possibly something wrong with reverse gears? The tractor is complete and has a nice 148 loader on , that’s why I traded so I know somebody on here will have a lot more knowledge than me about this issue, thanks again.

 

[Ray,IN]

Same result with plugs removed?

 

[bv]

Same result with plugs removed?

Yes and the tops of the pistons are clean for a running engine

 

[matthies]

The 3020 engines have the balancer box in the crankcase, something might have got stuck in the gears?

 

[bv]

The 3020 engines have the balancer box in the crankcase, something might have got stuck in the gears?

That is very possible, it may be time to remove the pan

 

[Powered By IH]

That is very possible, it may be time to remove the pan

Did you push in the clutch to eliminate the transmission and most of the clutch?

 

[bv]

Did you push in the clutch to eliminate the transmission and most of the clutch?

No I was working by myself and turning the engine with a bar at the flywheel but I did move the shifter to the tow position to see if there was a change but I will before I remove the oil pan

 

[Tx Jim]

Push down on clutch pedal then tie/block pedal down. If crankshaft still won't rotate 360° then I suggest to remove crankcase pan. If you need to remove balancer box it must be timed when reinstalled.

 

[JIM MN]

My first thought is the engine balance, teeth off gears?

 

[bv]

Push down on clutch pedal then tie/block pedal down. If crankshaft still won't rotate 360° then I suggest to remove crankcase pan. If you need to remove balancer box it must be timed when reinstalled.

Thank you Jim, that will be my next step.