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I am attempting to replace the lower intake manifold gasket and need to know the torque specification. I have a '99 Chevy C1500 truck w/5.7L engine (old body style).
torque specs for chevy 4.3 intake manifoldtorque specs for chevy 4.3 intake manifold
AnonymousMar 14, 2014
I'm replacing both my exhaust and my intake manifolds on my 69 ford f100 inline 6 300 cui pickup truck. Do I need gasketsI'm replacing both my exhaust and my intake manifolds on my 69 ford f100 inline 6 300 cui pickup truck. Do I need gaskets
need tighterning sequence and torque specifications for a chevy aveo 2004 exhaust manifoldneed tighterning sequence and torque specifications for a chevy aveo 2004 exhaust manifold
AnonymousMar 15, 2014
Torque Spec For 1997 Hyundai Tiburon Intake ManifoldTorque Spec For 1997 Hyundai Tiburon Intake Manifold
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Call any major autoparts store for the correct answer. There are updated torque specs for the gm 3.4 vs in order to deal with a common issue of leaking intake manifold gaskets. They should have the correct updated spec for you vehicle based on the specific Vin number
(step 1 ) the torque specs for the heads are---1998 through 2001 are 37 foot lbs. ( step 2) rotate an additional 90-degrees (1/4 turn). intake manifold bolts ( lower ) step 1-- 62 in-lbs, step 2--115 in-lbs. intake manifold bolts/studs ( upper ) 18 ft-lbs. this is for the 3.1 v-6, have a good day!
If removing the right cylinder head, remove the catalytic converter from exhaust manifold.
If removing the left cylinder head, remove the engine oil dipstick and tube.
Remove the rocker arms and pushrods.
Remove and discard the cylinder head bolts.
Remove the cylinder head.
Clean the mating surfaces on the following items:
Cylinder head
Cylinder block
Intake manifold
Clean the cylinder block bolt threads.
NOTE: During disassembly, keep the valve train components together for proper location during assembly. To Install: NOTE: Coat the cylinder head bolt threads using thread sealer.
If removed, install the following components:
Exhaust manifold
Accessory studs
Spark plugs
Place the cylinder head gasket in position over the dowel pins. Ensure that the THIS SIDE UP note is showing.
Install the cylinder head.
Cylinder head torque sequence ’99-‘00
Cylinder head torque sequence ’01-05
Install the new cylinder head bolts.
Tighten the cylinder head bolts a first pass to 44 ft lb (60 Nm).
Tighten the cylinder head bolts in sequence an additional 95 degrees.
Install the intake gasket.
Install the pushrods and rocker arms.
Raise and support the vehicle.
Install the catalytic converter and dipstick tube and indicator if removed.
These engines are legendary for intake manifold gaskets leaking, and this is exactly what's happening with this one. Yes, you will have to remove the intake manifold, and to do so, you will need the torque diagram to remove it, and also to torque the new one. It's best that you buy a Haynes manual so you know the exact procedure; it's a $15 insurance that you will be glad to have. If you aren't having problems with the head gaskets, I'd leave them alone personally, but if you want to undertake these, now would be the time to do so, as there's not a lot more to take apart. Main suggestion though, is to be absolutely sure you keep the push rods in the exact order and orientation, as they each have a unique wear pattern with the lifter. Changing them can cause them to lose their seal, depriving the valve of oil, and ruining your head.
Before servicing the vehicle, refer to the Precautions section.
Relieve the fuel system pressure.
Drain the cooling system.
Remove or disconnect the following:
Negative battery cable
Supercharger
Thermostat housing
Exhaust Gas Recirculation (EGR) tube at the intake manifold
Engine Control Temperature (ECT) sensor
Intake manifold
To install:
Install or connect the following:
Intake manifold with new gaskets. Torque the bolts, working from
the center out, to 11 ft. lbs. (15 Nm).
ECT sensor connector
EGR tube to the intake manifold
Thermostat housing
Supercharger
Negative battery cable
Refill and bleed the cooling system.
Run the engine and check for leaks and proper engine operation.
VIN K Engine
Before servicing the vehicle, refer to the Precautions section.
Disconnect the negative battery cable.
Drain the cooling system.
Relieve the fuel system pressure.
Remove or disconnect the following:
Fuel injector sight shield
Air inlet duct
Spark plug wires from the right side
Manifold Absolute Pressure (MAP) sensor
Vacuum lines from the intake manifold
Fuel lines
Fuel injector electrical connectors
Fuel regulator vacuum line
Fuel rail from the intake manifold
Exhaust Gas Recirculation (EGR) heat shield
Throttle cable bracket from the cylinder head mounting bracket and
the throttle body cables
Throttle body support bracket
Upper intake plenum and gasket
Thermostat housing
Electrical connector from the Engine Coolant Temperature (ECT)
sensor
Drive belt tensioner assembly
EGR valve outlet pipe
Lower intake manifold
Fig. Exploded view of the intake manifold and related
components-3.8L (VIN K) engine
Install or connect the following:
Intake manifold using new manifold gaskets. Torque the bolts in
sequence to 11 ft. lbs. (15 Nm); then, re-torque to 11 ft. lbs. (15 Nm).
EGR valve outlet pipe
Drive belt tensioner assembly. Torque the tensioner bolts to 37
ft. lbs. (50 Nm).
Electrical connector to the ECT sensor
Thermostat housing
Upper intake plenum. Torque the intake plenum bolts to 88 inch.
lbs. (10 Nm).
Throttle body support bracket
Throttle cable bracket to the cylinder head mounting bracket and
the cables to the throttle body lever
EGR heat shield
Fuel rail. Torque the fuel rail bolts to 88 inch. lbs. (10 Nm).
Fuel lines
Fuel regulator vacuum line
Fuel injector electrical connectors
Vacuum lines to the intake manifold
MAP sensor
Spark plug wires
Fuel injector sight shield and air inlet duct
Negative battery cable
Refill and bleed the cooling system.
Run the engine and check for leaks and proper engine operation.
2.2L Engine & 2.4L Engines These engines are not equipped
with rocker arms. The camshafts directly actuate the valves.
3.1L Engine & 3.4L Engines When install or connect the check the following: - Pushrods and the rocker arms. Torque the bolts to 24 ft. lbs. (32
Nm).
- Rocker arm cover using a new gasket. Torque the rocker cover bolts
to 89 inch lbs. (10 Nm). - Heater bypass pipe. Torque the screw at the water pump to 106 inch
lbs. (12 Nm), the bolt at the cylinder head corner to 18 ft. lbs. (25
Nm) and the nut to 18 ft. lbs. (25 Nm).
About the INTAKE MANIFOLD... - Intake manifold nuts and bolts and tighten to 89 inch lbs. (10 Nm) - Pushrods and rocker arms. Torque the bolts to 89 inch lbs. (10 Nm)
plus an additional 30 degree turn.
- Lower intake manifold. Apply sealant to the threads of the bolts
and torque the bolts to 115 inch lbs. (13 Nm).
Exploded view of the upper and lower intake-3.1L & 3.4L
engines
NOTE
The 3.8L (VIN K) non-supercharged engine uses a two-piece intake
manifold consisting of an upper air plenum which mounts the throttle
body and a lower intake manifold assembly which houses the fuel
injectors. The 3.8L (VIN 1) supercharged engine uses a similar lower
intake manifold. The supercharger serves as the upper manifold. Lower Manifold
NOTE
Two bolts which fasten the lower intake manifold to the cylinder
head are accessible only after the upper intake manifold is removed.
These bolts are located in the right front and left rear corners of the
lower intake manifold. Remove the upper intake manifold to service the
lower intake. The 3.8L (VIN 1) supercharged engine uses a manifold
similar to the 3.8L (VIN K), but the supercharger serves as the upper
manifold.
Disconnect the negative battery cable.
On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
Remove the upper intake manifold using the procedure above.
Remove the EGR outlet pipe from the intake manifold.
Detach the engine coolant temperature sensor wiring harness from the sensor.
Remove the lower intake manifold bolts and carefully lift off the manifold.
Clean all parts well with degreaser, especially the gasket seal
surfaces on the upper and lower manifold pieces and between the lower
manifold and the cylinder heads..
Install new gaskets to the cylinder heads and new seals to the
engine block. Carefully lower the manifold into place. Apply
thread-locking compound to the bolt threads. Make sure to install the
two hidden bolts in the lower intake manifold. Hand start all bolts,
then torque evenly to 11 ft. lbs. (15 Nm). Follow the toque sequence,
starting in the center, then working outwards in a circle.
Install the remaining components in the reverse order of the removal process.
Upper Intake Manifold (Plenum)
Disconnect the negative battery cable.
On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
Tag for identification, then remove the right side spark plug wires.
Disconnect the ignition wires from the fuel rail.
Remove the fuel rail. Please see Section 5.
Remove the cable bracket from the intake manifold.
Remove the throttle body.
NOTE
Two bolts which fasten the lower intake manifold to the cylinder
head are accessible are accessible only after the upper intake manifold
is removed. These bolts are located in the right front and left rear
corners of the lower intake manifold.
Remove the upper intake manifold bolts and carefully lift the upper intake manifold from the engine.
Fig. Upper intake manifold and bolt torque sequence-3.8L (VIN K) engine To install:
Clean all parts well with degreaser, especially the gasket seal surfaces on the upper and lower manifold pieces.
Install new gaskets to the cylinder heads and new seals to the
engine block. Carefully lower the manifold into place. Make sure to
install the two hidden bolts in the lower intake manifold. Hand start
all bolts, then torque evenly to 89 inch lbs. (10 Nm). Follow the
torque sequence, starting in the center, then working outwards in a
circle.
Install the remaining components in the reverse order of the removal process.
The corners of the intake manifold have coolant pasages. The lower intake manifold gasket will need to be replaced. There is an updated manifold gasket, manifold bolts, and torque specification. Call the chevrolet dealership and see if they will extend the warrant on this repair. It is a very common problem with this engine. Thanks Steve
YOU ROCK LT1ROB! THANK YOU FOR THE QUICK RESPONSE!
1989 Isuzu truck 2.6 liter engine torque specifications
torque specs for chevy 4.3 intake manifold
I'm replacing both my exhaust and my intake manifolds on my 69 ford f100 inline 6 300 cui pickup truck. Do I need gaskets
replace lower intake manifold gasket 1999 gmc savanna 2500
need tighterning sequence and torque specifications for a chevy aveo 2004 exhaust manifold
Torque Spec For 1997 Hyundai Tiburon Intake Manifold
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