Question about 1997 Toyota Previa

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Water loss through engine

Uk spec 2.4 petrol previa. is cam drive on end of camshafts or in middle like motor cycle engines. also are head gaskets a problem on these engines or would it be a cracked head/block/liner.

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  • mcquillan9jl May 25, 2009

    thanks seans46, the coolant runs out exhaust straight from header tank. not good i think. I will keep in touch.

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Yes cams are at front with the timing belt. not like motorcycles in the middle. I havent had many problems with them where I am. But a water loss in the engine is serious. If your sure the loss is internal then you have to tear down.

Posted on May 25, 2009

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Camshaft is chain driven not belt drive, and are on top of the engine, easily accessible by removing drivers seat, carpet and panel.
how much water are you losing, where do you think it's going. is there white smoke from exhaust or white sticky emulsion on oil filler cap?
if the water drips out underneath then its likely to be waterpump and they arent too difficult to replace

Posted on Nov 09, 2011

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P0022 for 2004 toyota sienna van


P0022 Toyota - Camshaft Position \'A\' Timing Over-Retarded Bank 2



























Possible causes




- Dirty Oil

- Faulty variable valve timing (VVT)

- Faulty oil control valve (OCV)

- Variable Valve Timing (VVT) harness is open or shorted

- Oil Control Valve (OCV) circuit is open or shorted

- Damaged Engine Control Module (ECM)




Tech notes



If the engine oil is clean and the VVT and OCV circuits are OK, replaced the VVT to resolve the problem.





When is the code detected?


After the ECM sends the target duty cycle signal to the OCV, the ECM monitors the OCV current to establish an actual duty cycle. The ECM determines the existence of a malfunction and sets the DTC when the actual duty cycle ratio varies from the target duty cycle ratio.


Possible symptoms


- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/Loss of power

- Engine rough idle


P0022 Toyota Description


The Engine Control Module (ECM) controls the Oil Control Valve (OCV) to regulate the intake camshaft angle. As a result of the angle change, the engine timing is advance or retard. Optimizing engine timing will help the engine improve torque and fuel economy, and the exhaust emissions decrease under overall driving conditions. The Variable Valve Timing (VVT) system includes the Oil Control Valve (OCV) and VVT controller. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.

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Where can i find the engine number on a 2TZ toyota engine? 2.4 petrol, 1990


It should be stamped on the block just under the head gasket.

Jun 26, 2014 | 1991 Toyota Previa

1 Answer

I need head bolt torque specs for a 2000 cadillac deville dts..


DeVille, Eldorado, Seville 1999-2005

Cylinder Head

Print


Removal & Installation

Left Side

  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Drain the cooling system.
  3. Properly relieve the fuel system pressure.
  4. Remove or disconnect the following:

    Negative battery cable Exhaust manifold Alternator Water crossover Intake manifold Valve cover Timing cover Secondary camshaft drive chain Power steering return hose retaining bolt from the cylinder head 3 M6 external drive bolts from the front portion of the cylinder head 10 M11 internal drive cylinder head bolts Cylinder head and gasket.
  5. Clean the head mating surfaces.

To install:

0996b43f80231662.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Left cylinder head bolt torque sequence-4.6L engine

  1. Install the cylinder head with a new gasket. Lubricate the bolts with engine oil prior to installation.
  2. Torque the M11 bolts in sequence as follows:
    1. Step 1: 30 ft. lbs. (40 Nm), plus an additional 70 degrees
    2. Step 2: Turn an additional 60 degrees
    3. Step 3: Turn an additional 60 degrees (total 190 degrees)

  3. Torque the M6 bolts to 106 inch lbs. (12 Nm)
  4. Install or connect the following:

    Power steering return hose retaining bolt to the cylinder head and tighten to 37 ft. lbs. (50 Nm) Secondary camshaft drive chain Timing cover Valve cover Intake manifold Water crossover Exhaust manifold Negative battery cable
  5. Change the oil and filter.
  6. Fill the cooling system.

Right Side
  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Drain the cooling system.
  3. Properly relieve the fuel system pressure.
  4. Remove or disconnect the following:

    Negative battery cable Exhaust manifold Water crossover Intake manifold Valve cover Timing cover Secondary camshaft drive chain Electrical connector from the Engine Coolant Temperature (ECT) sensor Nut attaching the coil cassette ground wire to the cylinder head Bolt attaching the exhaust crossover pipe to the cylinder head Bolt attaching the right transaxle mount bracket to the cylinder head Bolt attaching the rear transaxle brace to the transaxle Nuts attaching the rear transaxle brace to the cylinder head Rear transaxle brace 3 M6 external drive bolts from the front portion of the cylinder head 10 M11 internal drive cylinder head bolts Cylinder head and gasket
  5. Clean the head mating surfaces.

To install:

0996b43f80231663.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Right cylinder head bolt torque sequence- 4.6L engine

  1. Install the cylinder head with a new gasket. Lubricate the bolts with engine oil prior to installation.
  2. Torque the M11 bolts in sequence as follows:
    1. Step 1: 30 ft. lbs. (40 Nm), plus an additional 70 degrees.
    2. Step 2: Turn an additional 60 degrees.
    3. Step 3: Turn an additional 60 degrees (total 190 degrees).

  3. Torque the M6 bolts to 106 inch lbs. (12 Nm).
  4. Install or connect the following:

    Rear transaxle brace over the studs located at the rear of the right cylinder head Nuts attaching the rear transaxle brace to the cylinder head, loosely Bolts attaching the rear transaxle braces to the transaxle and tighten to 37 ft. lbs. (50 Nm) Nuts attaching the rear transaxle brace to the cylinder head and tighten 37 ft. lbs. (50 Nm) Electrical connector to the ECT sensor Bolt attaching the exhaust crossover pipe to the cylinder head and tighten to 18 ft. lbs. (25 Nm) Nut attaching the coil cassette ground wire to the cylinder head and tighten to 13 ft. lbs. (17 Nm) Secondary camshaft drive chain Timing cover Valve cover Intake manifold Water crossover Exhaust manifold Negative battery cable
  5. Change the oil and filter.
  6. Fill the cooling system.

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1 Answer

My car is leaking antifreeze, it got all over the engine, the mechanic is saying that i have compression loss on one side of engine, is this a major problem


yes more than likely you have a blown head gasket if your mechanic said it loss compression on one side of motor than you are only running on half of the motor (to put this in lay men terms this is like u having only one lung or half your heart although human body can run this way a car can not )
also depending on where the head gasket is blown you are more than likely dumping water into oil or visa vesra if you remember back to chemistry class water and oil don't mix oil job in the motor is to lubricate parts which it cant do with water in it on the flip side of coin when oil is in the water the oil clogs the water passages so then the motor cant cool

so if u continue to drive your car this not only are making the motor work twice as hard because only half motor is working it can't lubricate it self or cool it self
I wouldn't recommend driving this car until it fixed
If you continue to drive your car this way you end up with a blown motor instead of just a head gasket

Jan 29, 2011 | 2002 Jeep Liberty

1 Answer

Hello. Could you please advise me what the camshaft torque tightening specs are for a 1993 SEAT IBIZA . Thank you


CAM SHAFT BEARING CAPS 15 FT LBS. DRIVE SPROCKET BOLT 58 FT LBS. CAMSHAFT END PLAY IS 0.006 in. WARNING THIS IS THE 2.8L ENGINE WHEN TORQUEING CAM SHAFT BEARING CAPS YOU HAVE TO TIGHTEN THE BOLTS 2 TURNS AT A TIME IN A DIAGONAL PATTERN TO DRAW THE CAMSHAFT DOWN AGAINST THE VALVE SPRING.

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1 Answer

Fiat brava 2000w


If the head gasket is starting to go, the the water gets vapourized inside the engine. The water level will go down, sometimes you get white smoke from the exhaust, the car consumes more fuel and has less compression and performances.

If you are lucky, and you check the water you can drive a car with bad head gasket for many miles, before it blows completely and leave you on the middle of a motorway.

If the head gasket is starting to go better to fix it or to replace the car.

The part costs only thirty pounds or so here in UK, but the job is expensive, as you need to take apart the head.
Here in UK you dont pay less than four hundreds pounds, probably a bit more, depending on the garage.

Oct 26, 2008 | 2007 Fiat Pininfarina

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