1 Attachment(s)
Td42t thermostat housing modifcation.
Recently Heard of a mod to the housing and doing away with the oem thermostat for generic instead.
There is a hole in the bottom of the housing that can be tapped & plugged off.
This is done to stop the leak/flow of coolant via this port and force all fluid directly via top port of the fitting.
apparantly this mod stops fluid bypassing the thermostat, thus allowing coolant to spend more time undisturbed in the radiator to cool before thermostat opens again.
Attachment 62828
Your thoughts please.
Another hot GU TD42, suggestions welcomed.
Quote:
Originally Posted by
Robo
Its a little like the old days of removing the thermostat to make engine run cooler.
Only to find in hot weather the coolant doesn't spend sufficient time in the rad to cool,
so the radiator is eventually over powered and boils the coolant.
I know that this is a very old posting, well 2 years old anyway, and I have seen similar comments in the past in various places, but to me it just doesn't add up. If the coolant passes through the radiator quickly, it also passes through the water jacket of the engine quickly. It may not have as much time to cool while in the radiator, but it also has less time to pick up heat from the engine as well, so in any single pass, not as much heat will be transferred. However by moving quickly, it will circulate more frequently, and the end result should result in similar cooling capacity. It is not like the coolant can sit for ages in the engine getting hotter and hotter, and then do a fast pass through the radiator, without having enough time to transfer the heat to the airstream.
I can see that if you slow the passage of the coolant sufficiently, it could remain in the engine water jackets long enough to boil, before having the opportunity to cool during a slow passage through the radiator, but its hard to see that a fast moving coolant stream would be less effective than a slower moving stream.
This is of interest to me as I have a 99 GU TD42 ute, with original turbo, no intercooler but a propensity to overheat on towing a camper trailer up long climbs. We now have a small off road caravan (Track Trailer Topaz), which will be heavier and have more drag than the TVan it replaces, and although I have made some progress with this issue, I am not home free yet.
the ute has a 3" exhaust from the turbo back, rebuilt injector pump and injectors and dyno tuned by ProDyno Tune at Rockhampton, boost raised to 14-15psi at that time, 4row heavy duty radiator, full shrouds, but does not have all of the foam bits directing air through the a/c condenser and power steering cooler, or the side shield/sealing strips between radiator and radiator support bulkhead. It does have a duct floor between the bull-bar bottom edge and the base of the radiator. cooling system hoses have all been changed in the last 3 years, viscous coupling renewed with a new Dayco unit, Fan is standard, thermostat is genuine Nissan. It has been suggested when I inquired about an intercooler to assist in engine cooling, that a heavy duty fan hub and fan assy would be the first thing to try, but that $650 item is out of stock ATM, with a possible 5 week delay for new stock. I have about 6 weeks before we head off to The Kimberley area, so both the initial cost of this item and the time delay are of concern.
Anyone got any clues as to what may be the best and most cost effective option, and does anyone have experience with the bigger fan and hub combination?
