I would appreciate some input on this one as I am about to be driven crazy trying to figure out what the problem is.
I recently undertook routine replacement of the elbows and risers on my 1986 Tiara 3100 and as usual removing the old risers was a nightmare but eventually they came off but as I was removing the very last stud that connects the riser to the exhaust manifold it broke off. I tried drilling it out to no avail, so this led to replacement of the starboard exhaust manifold. Then I foolishely thought that it might be a good idea to have the heat exchanger checked and cleaned, only to have the repair shop tell me it was no longer serviceable. So I now had to purchase a new heat exchanger.($1200)
Upon reassembly with a new exhaust manifold, new elbows and risers, new heat exchager and new cooling hoses, I start the motor and find that the raw water pump is frozen, so I replace the impeller and all seems well until our first sea trial and the motor is now running about 20 degrees hotter than usual. I checked the raw water flow at the risers and it seems normal, bled out the fresh water system at the the thermostat and did the typical checks for air pockets etc but all seems normal, no leaks and no coolant loss. However all parts of the motor feel hotter than usual including the new heat exchanger. I am begining to wonder if there might be a problem with the new heat exchanger or possibly a thermostat issue but before I start randomely replacing parts I would appreciate fresh input.
Any idea as to what might be going on here?
Thanks in advance
Ned
I recently undertook routine replacement of the elbows and risers on my 1986 Tiara 3100 and as usual removing the old risers was a nightmare but eventually they came off but as I was removing the very last stud that connects the riser to the exhaust manifold it broke off. I tried drilling it out to no avail, so this led to replacement of the starboard exhaust manifold. Then I foolishely thought that it might be a good idea to have the heat exchanger checked and cleaned, only to have the repair shop tell me it was no longer serviceable. So I now had to purchase a new heat exchanger.($1200)
Upon reassembly with a new exhaust manifold, new elbows and risers, new heat exchager and new cooling hoses, I start the motor and find that the raw water pump is frozen, so I replace the impeller and all seems well until our first sea trial and the motor is now running about 20 degrees hotter than usual. I checked the raw water flow at the risers and it seems normal, bled out the fresh water system at the the thermostat and did the typical checks for air pockets etc but all seems normal, no leaks and no coolant loss. However all parts of the motor feel hotter than usual including the new heat exchanger. I am begining to wonder if there might be a problem with the new heat exchanger or possibly a thermostat issue but before I start randomely replacing parts I would appreciate fresh input.
Any idea as to what might be going on here?
Thanks in advance
Ned