gmctd wrote:
Yes, you should be able to start and run the engine for a short while....if your KJ has the gasoline-fueled I-4 or V6 engine
It is not a good idea to even start a Diesel engine with disconnected or defunct water pump, much less run it for awhile -
- Diesels generate more heat than gasoline engines, which is why the cooling systems are larger, incl the radiator, and why the thermostat system includes a bypass to ensure constant coolant flow thru the system, even when the T-stat is closed
Note: the attached viscous cabin heater is to overcome the 'deficiencies' of the constant-flow coolant system in winter climes - people need heat faster than the engine alone is allowed to generate that heat
WOW, There are a lot of errors in this post, for someone that I thought had a solid impression of how the diesel in the CRD works.
She said her viscous heater broke loose, and the serpentine belt came off. This is proven out by the steering "locking up" which could be an easy description for the difficulty of manually steering such a short rack - it does require a fair bit of muscle, as the gearing is quite steep.
The WATER PUMP however, should still be just fine, as it is driven by the timing belt. If there wasn't a coolant leak (I didn't see where she mentioned any leaking) then the engine is just fine, and only needs the timing belt and water pump as a matter of the required maintenance that is overdue.
The mounting points for the viscous heater are all part of the water pump anyway, so that is one problem solved rather easily.
Now... About the misconceptions above:
Diesel fuel does have more energy (measured as BTU, the measure of heat energy) than gasoline, HOWEVER, a diesel is more 'thermally efficient' than a gas engine, which means that the engine simply extracts this energy into WORK, and does NOT waste as much as simple heat! Diesels DO NOT make more heat than a gas engine. The thermostat is supremely important on a diesel engine to ensure that the engine actually reaches operating temperatures for efficient operation. Most gas engines can operate just fine with no thermostat at all, and will STILL have the penchant to overheat if left idling for long periods.
If you idle a diesel engine, it actually will get too COLD for efficient combustion if the thermostat doesn't keep the temperature up. This is also why the CRD only gets to 1/4 on the temp gauge when the thermostat has failed. I drove my CRD around for an entire SUMMER in Savannah with no engine fan at all, and the thermostat failed. It never even reached the center of the gauge. Yes, the viscous heater is for comfort heat for the passengers, but it also heats the engine's water faster, which helps the engine reach operating temperatures faster, for better combustion efficiency.
A recent CRD I was working on, we took it for approximately a 25 mile series of test drives, without the serpentine belt connected. All on battery, and running just fine. Yes, it will be hard to steer, but if Purple_Girl needs to get her CRD to somewhere, it can be done and safely, at least for the engine. The transmission is another story.