Question about 1995 Nissan Pickup

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I have an overheating problem with my Nissan TD27 engine, I have notice that cooling fan doesn't rotate faster even as i increase the RPM of the engine. is it possible that fan clutch is defective? can it be fixed?

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Fan plus headgasket

Posted on Mar 10, 2011

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Yes,check also coolant level,water pump,system for leaks as well

Posted on Dec 31, 2010

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My 1999 ford RAnger has heat but the fan makes alot of noise and does not blow out the heat and the trucks gauge will go hot. What would the issue? Heater core or mayb just the fuse?


Diagnose Cooling Fan Clutch On engines with belt-driven cooling fans, a fan clutch is often used to save energy and reduce noise. The fan clutch disengages slows or disengages the engine's cooling fan when extra cooling isn't needed. The fan pulls air through the radiator and air conditioning condenser when the vehicle isn't moving fast enough to provide adequate airflow for cooling. A fan can eat up anywhere from a couple of horsepower up to 12 or 15 hp on a big V8, so by reducing the parasitic horsepower loss on the engine the fan clutch makes a noticeable difference in fuel economy

TWO TYPES OF FAN CLUTCHES basic types of fan clutches: thermal and non-thermal (also called "torque limiting Thermal fan clutches have a temperature-sensitive bimetal coil spring on the front that reacts to temperature changes. When the air coming through the radiator is hot, the spring expands and opens an internal valve that reduces clutch slippage. This causes the fan to spin faster for increased cooling. As the air cools, the spring contracts and closes the valve. This increases the amount of clutch slippage, allowing the fan to slow down and decrease cooling FAN CLUTCH OPERATION

The clutch consists of a fluid coupling filled with a silicone based oil. In the cutaway view at the left, the area between the teeth on the clutch plates is filled with silicone fluid. An internal valve opens and closes a passage between the main fluid cavity and a fluid reservoir. When the passage is open, fluid enters the clutch and makes the fan to turn faster. When the valve is shut, fluid flows back to the reservoir but doesn't return, causing the clutch to slip and the fan to turn more slowly.
The non-thermal (torque limiting) fan clutch doesn't have a temperature sensing capability. It reacts only to speed, slipping to limit maximum fan speed to about 1200 to 2200 rpm depending on the application.

FAN CLUTCH PROBLEMS

A slipping fan clutch is often overlooked as the cause of an engine overheating problem.
As a fan clutch ages, fluid deterioration gradually causes an increase in slippage (about 200 rpm per year). After a number of years of service, the clutch may slip so badly that the fan can't keep up with the cooling needs of the engine and the engine overheats. At this point, replacement is often necessary.
Other signs of fan cluch failure would include any looseness in the clutch (check for fan wobble), or oil streaks radiating outward from the clutch hub.
If the clutch is binding, the fan may not release causing excessive cooling and noise, especially at highway speeds

CHECKING THE FAN CLUTCH

A good clutch should offer a certain amount of resistance when spun by hand (engine off, of course!). But if the fan spins with little resistance (more than 1 to 1-1/2 turns), the fan clutch is slipping too much and needs to be replaced.
If the fan binds, does not turn or offers a lot of resistance, it has seized and also needs to be replaced.
Fan speed can also be checked with an optical tachometer, by marking one of the fan blades with chalk and using a timing light to observe speed changes, and/or listening for changes in fan noise as engine speed changes.
You should also try to wiggle the fan blades by hand. If there is any wobble in the fan, there is a bad bearing in the fan clutch, or a worn bearing on the water pump shaft. A bad water pump bearing will usually cause the water pump to leak and/or make noise, but not always. Remove the fan clutch and see if the play is in the water pump shaft. If it feels tight (no play or wobble), replace the fan clutch.

FAN CLUTCH REPLACEMENT

Many experts say it is a good idea to replace the fan clutch at the same time as the water pump if the water pump has failed. The reason is because both age at about the same rate, so if the water pump has failed, the fan clutch may also fail soon. As as we mentioned earlier, a high mileage fan clutch may be slipping excessively increasing the risk of overheating.
When you buy a replacement fan clutch, make sure you get the same type (thermal or nonthermal) as the original. You can always upgrade from a nonthermal to a more efficient thermal fan clutch, but never the reverse. Or, you can get rid of the fan and clutch altogether and install an aftermarket electric fan kit to cool the radiator.

Sep 28, 2016 | Ford Cars & Trucks

3 Answers

Overheating and antifreeze coming from cap, but fan to cool it down, is barely turning what could cause this.


Could be a faulty fan motor, or fan relay.
You should be able to run a wire from battery power to the fan to make it run at full speed to test.

Sep 04, 2015 | 1996 Geo Tracker 2 Door

1 Answer

I have a nissan diesel 4 cylinder td27 engine , what i the normal oil pressure gauge reading for this engine whilst running


2.9 to 3.9 bar at 3000 rpm is fairly general for the Nissan range including turbo diesel, though the pressure isn't listed for the td27 engine. I doubt it would be more or less than the others.
I notice one Nissan commercial vehicle engine where 3.0 bar at 2000 rpm is specified.

The oil pressure test should be carried out at normal operating temperature.

Feb 26, 2015 | Nissan Cars & Trucks

1 Answer

2003 Nissan Xterra - Fan noise when a/c on


No that doesn't sound like the problem, the fan clutch locks up to cool the engine off due to the increased load of the AC system on the cooling system, so it locks up and gets much louder. If it didn't lock up the engine would overheat.

Jun 28, 2012 | Cars & Trucks

2 Answers

ENGINE SPECS FOR NISSAN TD27 ENGINE


need head bolt torque setting for nissan td27 deisel engine been checking pots after she reved out and couldnt be turned off turns out if sump gets overfilled the engine will **** oil from sump and rev out ntill it explodes lucky we managed bto stop ours

Apr 08, 2011 | Nissan Pickup Cars & Trucks

1 Answer

How to remove a td27 fuel injector pump in order to reseal it?


hi.. I have TD 27 engine. first time I start it. there is small miss.so I` ve removed the whole injector pump , cleaned it & fix it. now it doesn`t start first time. but few times I tried. it will starts. but when I increased the engine speed taped noise coming. if there is any timing of the injector pump. please help me to solve it .
thanks. jaya.

Jun 13, 2009 | 1997 Nissan Pathfinder

2 Answers

2003 Nissan Altima, Air condition makes loud noise when the unit is turn on. It slows down where u cant almost hear it after you turn the fan off.


When you put your A/C on, there is Vacum Motor or Solonoide, that increases RPM of the Engine to compensate the load of an A/C. If the vacum hose is leaking or raptured the RPM of Engine remain low and Engine Shakes. When you put the A/C on and the RPM of Engine Increases, but a little, then your Selonoide is working but not adjusted properly, so adjust it for the proper RPM of the Engine. Put all the loads on, I mean Head Lights and A/C on and then ajust the RPM.

Jun 02, 2009 | 2001 Nissan Altima

1 Answer

Cooling fan clutch seems to be seized up. it continues to run all the time and increases with engine rpm


Can you move it fairly easy, no grinding of bearings when engine is off, by hand? If yes, your truck may be running hot. If no, time for replacement.

May 10, 2009 | 1991 Nissan Pickup

2 Answers

Stick shift # Automatic RPM


That is normal,If you do the same speed in 4th gear the rpm's will almost double.

The rpm's will repond faster in a manual than an automatic.

In a manual the engine supplies the power required directly to the gear that you have selected thus the engine rpm's will increase or decrease as needed.

Jan 07, 2009 | 2002 Nissan Altima

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