Hey neighbor! I'm late to the dance bit if a check valve flap us bad it will allow water to drain back to the pool regardless of any air leaks. The flapper kits are cheap and should be changed first to prevent a goose chase.
Hi Darin. Yes, done this a couple of times, both times with cinder block. Keys: drainage is a must. Access to the electrical for repairs is also a must.
Several questions. What is the temp on the control panel, does it match water temp with a thermometer? Is your filter clean, that can cause the high.limit to trip and be a cause for low jet flow.
Hi Newpoo. I'm here in SoCal. It's not normal, but I have seen 3 pools that were fiberglassed, one was a commercial pool. They held up well. All these 3 were cracked gunite as well. I can't say yes or no to the procedure, but the ones I saw looked good.
Agree Pilotwerx. A new motor instead of a bearing job would be best. I was unsure about the noise.... Only because I have had that type of noise in a portable spa if something is pluging the impellor or a suction valve was blocked. Thirty years a spa tech, but I'm wrong sometimes. Re Lavaman...
Make sure that any shutoff valves are open and remove carefuly the filter cartridge and check it again. It dealt sounds more like an obstruction I'm the suction or return lines. Check those out. Bearing replacement in a pool or spa motor is a difficult job.
It could be the filter, or make sure the JVA is set correctly. You can adjust the turn radius both ways. These valves are sometimes adjusted to raise or lower flow from a spa to a pool.