"One of my KAD43's runs co
"One of my KAD43's runs consistently hotter than the other - especially when carrying a large group of passengers (20+). I have verified the temp at the thermostat housing with an IR thermometer.
A couple of questions:
Can an improperly timed injector pump / or an excessive fuel issue cause a diesel to run hot?
If so, how do I adjust the injector timing or the amount of fuel being metered to the injectors?
Some history:
Dockside at idle, both engines are at about 100 degrees. When running at 3,000 rpm's, the port engine temp is around 195 - and with a load of passengers, the temp slowly creeps up toward 200 degrees. All is well on the starboard engine - it consistently runs at 180 - even with a load of passengers.
I've been through the raw water and fresh water cooling systems on the port engine more than once and have found nothing.
I have swapped, cleaned or replaced the following:
thermostats (replaced, swapped)
heat exchanger (cleaned)
aftercooler (cleaned)
raw water impeller (replaced)
raw water pump (replaced)
fresh water pump (replaced)
hoses and hose clamps (replaced several)
belts (replaced)
Prior to this, a breach in the head gasket was allowing combustion pressure to pressurize the fresh water system and then caused coolant to be vented into the bilge from the expansion tank. The head gasket was replaced last off-season (head gasket replacement was done by Volvo certified tech).
After replacing the head gasket, the fresh water system is maintaining the proper amount of coolant but the engine continues to run hotter than normal.
I have inspected all components of the raw water system from the thru hull intake up to and including the exhaust riser (heat exchanger, hoses, fittings, strainers, etc...). FYI - the boat is set up with thru hull pick-ups and does not use the outdrive pick-ups.
I have also installed a piece of clear hose at the raw water output side of the heat exchanger and have a steady, solid stream of water there."
"One of my KAD43's runs consistently hotter than the other - especially when carrying a large group of passengers (20+). I have verified the temp at the thermostat housing with an IR thermometer.
A couple of questions:
Can an improperly timed injector pump / or an excessive fuel issue cause a diesel to run hot?
If so, how do I adjust the injector timing or the amount of fuel being metered to the injectors?
Some history:
Dockside at idle, both engines are at about 100 degrees. When running at 3,000 rpm's, the port engine temp is around 195 - and with a load of passengers, the temp slowly creeps up toward 200 degrees. All is well on the starboard engine - it consistently runs at 180 - even with a load of passengers.
I've been through the raw water and fresh water cooling systems on the port engine more than once and have found nothing.
I have swapped, cleaned or replaced the following:
thermostats (replaced, swapped)
heat exchanger (cleaned)
aftercooler (cleaned)
raw water impeller (replaced)
raw water pump (replaced)
fresh water pump (replaced)
hoses and hose clamps (replaced several)
belts (replaced)
Prior to this, a breach in the head gasket was allowing combustion pressure to pressurize the fresh water system and then caused coolant to be vented into the bilge from the expansion tank. The head gasket was replaced last off-season (head gasket replacement was done by Volvo certified tech).
After replacing the head gasket, the fresh water system is maintaining the proper amount of coolant but the engine continues to run hotter than normal.
I have inspected all components of the raw water system from the thru hull intake up to and including the exhaust riser (heat exchanger, hoses, fittings, strainers, etc...). FYI - the boat is set up with thru hull pick-ups and does not use the outdrive pick-ups.
I have also installed a piece of clear hose at the raw water output side of the heat exchanger and have a steady, solid stream of water there."