We recently picked up a reasonably clean but needing some TLC 1995 Comp TS6M with ~400hrs on it. Part of the reason we were OK with the project was that research indicated that this rounded-windshield model had the composite stringers, so wasn't prone to the rot that took place on the earlier wooden stringer versions.

Boat has the PCM GT40 Pro Boss SEFI Ford 351W engine, which I'm quite familiar with.

Repairs performed so far:
- Blower replacement (one was seized)
- Throttle Position Sensor replacement to resolve surging issue
- Oil pressure sender replaced (gauge was jumping 0-40psi)
- Shifter linkage realignment
- Cable disassembly, cleaning, lubrication
- Packing for drive shaft replaced
- New stainless mufflers installed (original ones were rotten)

Current issues:
- Transmission fluid leak causing slip when it gets low
- Fuel level sender needs replacement, always shows full
- Engine temperature "limp mode" switch needs replacement, currently bypassed
- Heater hoses bypassed (assume the core leaks)
- Horn doesn't work
- Interior lights don't work
- Significant leak behind the drivers-side stringer that spills into the main bilge, significantly more when under way under load

This thread is about that last issue.

Reading through this forum and what I've found on google, it seems somewhat common for there to be leaks around the flaps on the rear of the boat. I was only up to the cottage for the weekend and when we pulled the large 3-man tube, we got significant accumulation (like to the floor) of water, which was made worse by an acorn shell fragment plugging up the bilge pump. Seems to be less of an issue with less load (just the boat, with people, no tube). It was originally taking in water around the driveshaft but that's been resolved and this "other" leak appears to be a bigger source.

Of significance: The water entering is quite warm, appearing to have come from the engine or having been in contact with the exhaust. This makes sense, given the compartment/location the water appears to be coming from.

One of the lag bolts for the right-rear motor mount is missing (there were several missing when we bought the boat, they've been all replaced except this one) and this is where significant water is coming through into the main bilge. Once the boat is settled into the slip and no longer being used, this leak turns into a drip. When you first get back and when you are under way it is quite the significant amount pouring through this hole. The bolts all bite into the stringers without issue, not sure why they were missing.

My current plant is to lift the boat in the slip with straps and see if I can see water coming out around the flaps or some other location. That failing, put some water into that area with a hose and see if I can make it leak.

Engine runs like a Swiss watch with the TPS replaced, and there are no visible leaks on or around it with it running.

Thoughts, feedback?