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This sounds like the nose gear uplock is not rigged correctly or the uplock switch is faulty or misrigged.
Make sure that the rigging of the uplock and downlock switches are done as per the Cessna 337H service manual.
Also time the gear retraction with full voltage on the a/c and check that against the service manual as slow retraction would mean a bad power pack.
Remember in the air the nose gear retracts into the air flow. On the ground you cannot duplicate this.
Clue, if the motor does not shut off,
1 main gear retraction is not complete, ie uplock switches not made.
2. The power pack is not switching from gear up to doors close, which comes back to the above.
Easy to check the uplock switches--
Remove the center console.
Find the in-line connector at the top of the power pack.
Put a multimeter on pin 4 and with the gear up you should have 28 volts here.
No 28 volts here and the doors will not close, and you have a uplock switch faulty or misrigged.
If all this checks out ok, looks like you have as Dave says a power pack problem.
Cheers
Pete
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