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[6622n54]

Install a newly rebuild engine into my 1971 TR6. Connected the battery to the starter and turned the key and the starter just grinded away. One of the reasons for pulling the engine in the first place. The engine turns easily enough with a wrench. but the starter is not turning it. I was hopefull that maybe the previous owner install the wrong starter, and the gears are not meshing. The engine number is CC54739 E and the number that are on the starter are 25626 E - M4182. It would be a lot easier to put in a new starter then pulling the engine again.

[TR6Rich]

Sounds like the starter. Replace it with a high torque gear reduction starter. I got mine on Ebay.

[6622n54]

Sounds like the starter. Replace it with a high torque gear reduction starter. I got mine on Ebay.

I installed a high torque starter and still the same issue. The starter is getting the power it needs, the flywheel has been inspected with no issues. It seams like something is holding the engine from turning. The engine can only be turned by hand with a wrench on the front nut.

[charley fitch]

I am sure that a lot of us forum users have looked at your submission and come up with a few ideas, but I am convinced that you must have looked into many of those already.  So to err on the side of helping you, I will throw out a few ideas. 
If the starter is turning over with adequate power then I must assume that you have a good battery (a new battery is best to eliminate this source of a problem)and good contacts that are  giving enough power to the starter. A weak battery will not be any help in getting enough power to actually start a car. But of course it might allow the starter to make some noise.  If the starter is spinning but the engine is not turning over there may be an issue with the distance of the starter from the flywheel.  Could there have been or is there currently a spacer on the previous starter that changed the distance of the starter from the flywheel?  The starter gear must move into position against the flywheel when the starter is activated.  If the gear does not mesh with the flywheel there could be something wrong with the teeth on the flywheel or an incorrect distance from the starter to the flywheel.
 Could this rebuilt engine have the wrong flywheel mounted?
I do not have a TR6, but is there an incorrect way of mounting the starter, ie, one particular side up?
Hope this helps you either find or eliminate a cause.
Charley