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Old 05-17-2009, 12:15 PM   #31
Weldangrind   Weldangrind is offline
 
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If you intend to flush the cooling system (which is a good idea), make sure you use low pressure. You don't want this job to include a new heater core as well.

I take off one of the heater hoses and figure out how to connect a garden hose to it. I've used various barbed fittings, depending on the heater hose size. You can often buy a cheap stepped fitting at an auto parts store that will accept hose bib thread at one end, and you then cut the other end until the plastic tube fits the heater hose.

As iMoose pointed out, glycol is poisonous to dogs, cats and kids. Don't worry about using glycol after you complete repairs. At this time of year, you can safely run just water in the cooling system while you check for leaks and overheating. Once you are satisfied, drain the water and replace it with 50/50 water and antifreeze for year-round use.
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Old 05-17-2009, 07:03 PM   #32
katoranger   katoranger is offline
 
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Well. It already needs a heater core. It has been bypassed due to a leak there.

Since the heater lines enter at the top it would make sense to use them and flush down.

I will try to catch it all in a bucket as I go. Not much glycol left in the system either. I plan to just use water until I am sure I got it fixed.

Thanks for the tips.

Allen
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Old 05-18-2009, 11:19 AM   #33
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Nice find, Allen! You got an amazing bargain for $150! The photos look great.

Spud
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Old 05-21-2009, 12:16 PM   #34
katoranger   katoranger is offline
 
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Title arrived today. Time to get started on it. Needs to be ready by August 2nd. Can't drop my daughter off at school on the lifan.

Allen
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Old 05-28-2009, 01:35 PM   #35
katoranger   katoranger is offline
 
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Well. Got to work on it today. Put it back together with a new thermostat. Ran it to get the air bubbles out. Never got hot. Seems to run pretty good. Took it for ride to the junkyard to see what parts are available there. Need an exhaust pipe.

Crack open the cap and vented out some more bubbles and topped it off again. Still not hot.

Maybe the thermostat and a good burp is all it needed.

Allen
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Old 05-28-2009, 07:04 PM   #36
katoranger   katoranger is offline
 
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Okay. Still getting hot. I got it up to temp and I can stop the fan with my hand. It spins freely when warm.

Also I am wondering if the water pump may be weak. Might pay to just go ahead and replace it.

Allen
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Old 05-29-2009, 08:39 AM   #37
Cal25   Cal25 is offline
 
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I work with pumps all the time. they really are pretty simple. If the impellor turns, it is going to work. The problems are bearings and the seals. Loose either and its gonna leak.

All the symtoms you describe sound like the fan clutch to me. Might not be that much more work to do the water pump while changing the clutch. The pump on my Nissan was only about 15 bucks and took about 20 minutes to change. Spent most of a Saturday once changeing the pump on a Crown Vic. I guess I would depend on how long you plan to use it.


 
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Old 05-29-2009, 08:56 AM   #38
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Thanks. I think the pump is alittle more involved, but the clutch would be easy. It has four bolts that I can easily reach with minor skin loss.

Think I will go get a clutch and a new radiator cap while I am at it. I am planning to drive this truck for awhile. Also planning to see if I can import a Mazda RF turbodiesel to put in it.

Allen
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Old 05-29-2009, 08:32 PM   #39
VinceDrake   VinceDrake is offline
 
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Hi Kato!

If you can stop the clutch fan with your hand when the radiator is good and toasty, and it doesn't hurt, that clutch is *definatly not working.* With a hot engine, and a hot radiator, engine borderline overheating, you should hear a noise from the clutch, like a jet aircraft taking off, and it should be moving a metric fork-ton of air.

They make very little consideration for noise when designing the rad fans on any vehicle, it just has to move a whole schwack of air.

Usually I keep a couple of Nissan clutch fans in stock, as they are notoriously unreliable. They seem to either not work at all, or engage all the time, making a terrible noise at highway speed.

If a clutch fails to resolve the issue, some super-cheap after market pumps use a *plastic* impeller. Whoever thought of that should be shot. What tends to happen, is the plastic impeller cracks, and then spins on the pulley shaft, so instead of a impeller turning at 3000rpms, you get an impeller turning at maybe 500rpms, or whatever it feels like at that moment. Some of the worst ones will slip when the coolant is hot, making the plastic expand.

Usually the symptoms of cheap, crappy water-pump disease are almost exactly the same like a blown headgasket, but without the white smoke, or cloudy oil.

Nissans of that era, usually used a tin impeller, but if someone at some point in time already changed it, it could have been one of the awful ones.

Hopefully this is of some help...
--Vince
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Old 05-29-2009, 10:13 PM   #40
katoranger   katoranger is offline
 
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Thanks, I ordered a clutch from napa. Should be in in the morning. Also picking up a new radiator cap while I'm at it.

I replaced a water pump on a ford 300 6 that the impeller fell off. The china replacement pump I found was of much better quality than the one I removed.

Hopefully the fan clutch fixes it and I can drive it. Just need to fix the exhaust leak. The whole pipe if rotted out under the cab. There is one in the junkyard. I don't want to spend $50 for it new.

Allen
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Old 05-30-2009, 12:26 PM   #41
katoranger   katoranger is offline
 
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New clutch. I can still stop it by hand, but it does not get hot now. It idled for 30 minutes in the backyard. I put a new cap on it too and it wasn't bubbling out of the new cap. I also didn't hear the hissing noise.

Temp never got above halfway on the guage and would drop back when the thermostat opened.

Just need to drain some water and add antifreeze now. I think the cap may have been part of the problem.

Allen
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Old 05-30-2009, 02:05 PM   #42
katoranger   katoranger is offline
 
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Did all that and I went back out to check the water level. Started it up and it started smoking white. Looks like the head gasket went.

Going to find me a replacement engine. Maybe even a JDM turbodiesel .

Since it already had one headgasket odds are that it probably has some other issue too.

Allen
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Old 05-30-2009, 08:08 PM   #43
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I am going to pull the head and take a look to see what the previous "gasket replacement" was like. Only thing I will be out is time.

Allen
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Old 05-31-2009, 01:30 AM   #44
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Check for gasket flutter on the block. If it's etched you will need to get it surfaced or it will just keep blowing gaskets. These Mazda's are terrible for that and I'd be 'shocked' if it didn't need it.


 
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Old 05-31-2009, 02:26 PM   #45
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Found me another truck that is ready to roll. Going to part this mazda out and make some funds off of it.


Ford Rangers are much easier to find parts for. That and I like Fords. They didn't accept the bailout money.

Allen
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