Question about 1991 Toyota Xtracab

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My 1995 4X4 3.0L engine head gasketfailed at 251K km and was replaced at a cost of about $2400CDN. Coolant in the block damaged the bearings and the engine blew 30K km later. It was replaced at a cost of about $5500CDN and the head gasket of the new engine (it had 168K km on it) blew within 1000km and was repaired for about $1700. This seems to be a common problem and the dealer told me nothing about a recall despite being asked directly about a recall for this defect twice. I am not a happy owner!

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  • tim mcgrath May 11, 2010

    haven't heard of this problem, have done a few heads on them, but i allways have all the machine work done to heads

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Here in the US the NTSB can be contacted online or by phone. National Traffic Safty Board surely has a Canadian counterpart. They will have a list of TSB(technical Service Bullitins) and recalls. But it's 15 years old and they probably don't apply anymore. 251 K is pretty long life though. I had 362K on a GMC 350, then it blew the head gasket too.

Posted on Feb 05, 2010

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Where is the waterpump on 2003kia sorento lx ?


Water pump is Timing belt driven. It is below the Camshaft sprocket, in the timing case. If you want to repair/replace it here are the instructions.
>

COMPONENTS

REMOVAL
  1. Using the drain plug, drain the coolant.
  2. Remove the drive belt and the engine coolant pump pulley.
  3. Remove the timing belt cover, the auto tensioner and idler pulley.
  4. Remove the water outlet fitting, the thermostat case and the water pump fitting.
  5. Remove the engine coolant pump mounting bolts.
  1. Remove the engine coolant pump assembly from the cylinder block.
INSPECTION
  1. Check the engine coolant Water pump for cracks, damage or wear, and replace the pump assembly if necessary.
  2. Check the bearing for damage, abnormal noise and sluggish rotation and replace the pump assembly if necessary.
  3. Check the seal it for leaks and replace the pump assembly if necessary.
INSTALLATION
>

  1. Clean the gasket surfaces of the engine coolant pump body and the cylinder block.
>

  1. Install the new engine coolant pump gasket and pump assembly. Tighten the bolts to the specified torque. Tightening torque
Engine coolant pump bolt:
Head mark "7": 17 - 22 Nm(170 - 220 kg.cm, 12 - 16 ft. lbs.)
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Courtesy All Data LLC
© 2015 ALLDATA LLC. All rights reserved. Terms and Condit

Mar 15, 2015 | 2003 Kia Sorento

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What damage can be caused to a vehicle engine overheats


Hi Anonymous,
It probably depends how far you drove after the car overheated. It is extremely bad news to drive an overheated car.
Typically the head gasket (between the cylinder head and the engine block) will warp when the coolant goes dry and the engine overheats. And then it leaks - both on the outside of the engine block and with big white smoke out the tailpipe.
Replacing the head gasket is doable but expensive.
But if you don't see any leaks on the block or white smoke you may have dodged a bullet.
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White stuff under oil filler lid


Head gasket between engine block and valve header is leaking coolant into engine oil crank case. Expect a major costly repair because mechanic has to remove many parts to replace head gasket. If you have not overheat the engine, it may cost less. Because overheat engine will damage other components such as radiator,water pump, main seal, oil seal, timing belt.

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White smoke coming out of tail pipe, iddles.


usually a sign of a blown head gasket or intake gasket or, gulp a cracked head or block. Check your engine oil for a milky color, This would confirm a blown head gasket. There is a test to determine if hydrocarbons are in your coolant. If your coolant level is low or empty, this is another sign.

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Overheated, mechanic replaced heads (perhaps on wrong sides?), then knocking began in engine (not there before). so can the heads be put on wrongly? and if so, what problems would it cause? thnk that the...


During an overheat, coolant can enter the engine and goes into the oil pan. This in itself can damage the crank bearings. If the oil was not changed before the engine was re-started after the repair, the very first thing to circulate through the oiling system is coolant.(oil will float on top)
The reality of this is that proving when that happened is nearly impossible unless the oil has still not been changed.
Heads are generally interchangeable and if not, the accessories on the front cannot be mounted.
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Loosing antifreeze


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WHERE COOLANT LEAKS OCCUR
Coolant leaks can occur anywhere in the cooling system. Nine out of ten times, coolant leaks are easy to find because the coolant can be seen dripping, spraying, seeping or bubbling from the leaky component. Open the hood and visually inspect the engine and cooling system for any sign of liquid leaking from the engine, radiator or hoses. The color of the coolant may be green, orange or yellow depending on the type of antifreeze in the system. The most common places where coolant may be leaking are:
Water pump -- A bad shaft seal will allow coolant to dribble out of the vent hole just under the water pump pulley shaft. If the water pump is a two-piece unit with a backing plate, the gasket between the housing and back cover may be leaking. The gasket or o-ring that seals the pump to the engine front cover on cover-mounted water pumps can also leak coolant. Look for stains, discoloration or liquid coolant on the outside of the water pump or engine.

Radiator -- Radiators can develop leaks around upper or loser hose connections as a result of vibration. The seams where the core is mated to the end tanks is another place where leaks frequently develop, especially on aluminum radiators with plastic end tanks. On copper/brass radiators, leaks typically occur where the cooling tubes in the core are connected or soldered to the core headers. The core itself is also vulnerable to stone damage. Internal corrosion caused by old coolant that has never been changed can also eat through the metal in the radiator, causing it to leak.

Most cooling systems today are designed to operate at 8 to 14 psi. If the radiator can't hold pressure, your engine will overheat and lose coolant.

Hoses -- Cracks, pinholes or splits in a radiator hose or heater hose will leak coolant. A hose leak will usually send a stream of hot coolant spraying out of the hose. A corroded hose connection or a loose or damaged hose clamp may also allow coolant to leak from the end of a hose. Sometimes the leak may only occur once the hose gets hot and the pinhole or crack opens up.

Freeze plugs -- These are the casting plugs or expansion plugs in the sides of the engine block and/or cylinder head. The flat steel plugs corroded from the inside out, and may develop leaks that are hard to see because of the plug's location behind the exhaust manifold, engine mount or other engine accessories. On V6 and V8 blocks, the plugs are most easily inspected from underneath the vehicle.

Heater Core -- The heater core is located inside the heating ventilation and air conditioning (HVAC) unit under the dash. It is out of sight so you cannot see a leak directly. But if the heater core is leaking (or a hose connection to the heater core is leaking), coolant will be seeping out of the bottom of the HVAC unit and dripping on the floor inside the passenger compartment. Look for stains or wet spots on the bottom of the plastic HVAC case, or on the passenger side floor.

Intake Manifold gasket -- The gasket that seals the intake manifold to the cylinder heads may leak and allow coolant to enter the intake port, crankcase or dribble down the outside of the engine. Some engines such as General Motors 3.1L and 3.4L V6 engines as well as 4.3L, 5.0L and 5.7L V8s are notorious for leaky intake manifold gaskets. The intake manifold gaskets on these engines are plastic and often fail at 50,000 to 80,000 miles. Other troublesome applications include the intake manifold gaskets on Buick 3800 V6 and Ford 4.0L V6 engines.

INTERNAL COOLANT LEAKS
There are the worst kind of coolant leaks for two reasons. One is that they are impossible to see because they are hidden inside the engine. The other is that internal coolant leaks can be very expensive to repair.

Bad head gasket --Internal coolant leaks are most often due to a bad head gasket. The head gasket may leak coolant into a cylinder, or into the crankcase. Coolant leaks into the crankcase dilute the oil and can damage the bearings in your engine. A head gasket leaking coolant into a cylinder can foul the spark plug, and create a lot of white smoke in the exhaust. Adding sealer to the cooling system may plug the leak if it is not too bad, but eventually the head gasket will have to be replaced.

If you suspect a head gasket leak, have the cooling system pressure tested. If it fails to hold pressure, there is an internal leak. A "block tester" can also be used to diagnose a leaky head gasket. This device draws air from the cooling system into a chamber that contains a special blue colored leak detection liquid. Combustion gases will react with the liquid and cause it to change color from blue to green if the head gasket is leaking.

Head gasket failures are often the result of engine overheating (which may have occurred because of a coolant leak elsewhere in the cooling system, a bad thermostat, or an electric cooling fan not working). When the engine overheats, thermal expansion can crush and damage portions of the head gasket. This damaged areas may then start to leak combustion pressure and/or coolant.

Cracked Head or Block -- Internal coolant leaks can also occur if the cylinder head or engine block has a crack in a cooling jacket. A combustion chamber leak in the cylinder head or block will leak coolant into the cylinder. This dilutes the oil on the cylinder walls and can damage the piston and rings. If the coolant contains silicates (conventional green antifreeze), it can also foul the oxygen sensor and catalytic converter. If enough coolant leaks into the cylinder (as when the engine is sitting overnight), it may even hydro-lock the engine and prevent it from cranking when you try to start it. Internal leaks such as these can be diagnosed by pressure testing the cooling system or using a block checker.

A coolant leak into the crankcase is also bad news because it can damage the bearings. Coolant leaking into the crankcase will make the oil level on the dipstick appear to be higher than normal. The oil may also appear frothy, muddy or discolored because of the coolant contamination.

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