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Running on the hard
The short answer is: yes, you can run the A4 on the hard.
If you just want to see if the engine will start (eg., run for 10 seconds or less) then go ahead. Use the choke to get it started but always run it in NEUTRAL while on the hard. The reason for this is the cutlass bearing (gland prop shaft goes through exiting hull) relies on water for lubrication. No water, no lubrication and your cutlass bearing will wear down quickly and require replacing. Be aware that some transmissions will allow the shaft to spin a bit even in neutral, ours does.
To run on the hard for any longer duration you will need to set up a source of cooling water for the engine. This is also how you winterize the engine only drawing anti-freeze through. If the PO did as Don suggests they would have installed a 'T' fitting in the raw water intake hose which allows for an alternate water source for cooling.
Our A4 is 41 years old this year.
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