The spec for the valve cover fasteners is 10 nm (about 7.2 ft/lbs) and the sequence of tightening is diagonally from inside to outside. Joe please rate my answer as very helpful. thanks
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
20. INSTALL CYLINDER HEAD COVER SUB-ASSY
(a) Apply seal packing to the cylinder head as shown in the
illustration.
Seal packing: Part No. 08826-00080 or equivalent
NOTICE:
Remove any oil from the contact surface.
Install the cylinder head cover within 3 minutes after
applying seal packing.
Do not start the engine within 2 hours after installing.
(b) Install the cylinder head cover with the 9 bolts. Tighten the
bolt uniformly in several steps.
Torque: 8.0 Nm (80 kgf cm, 71 in.lbf)
(c) Install the engine wire harness with the 3 nuts.
Torque: 8.4 Nm (85 kgf cm, 74 in.lbf)
21. INSTALL CYLINDER HEAD COVER SUB-ASSY LH
(a) Apply seal packing to the cylinder head as shown in the
illustration.
Seal packing: Part No. 08826-00080 or equivalent
NOTICE:
Remove any oil from the contact surface.
Install the cylinder head cover within 3 minutes after
applying seal packing.
Do not start the engine within 2 hours after installing.
(b) Install the cylinder head cover with the 9 bolts. Tighten the
bolt uniformly in several steps.
Torque: 8.0 Nm (80 kgf cm, 71 in.lbf)
(c) Using an E6 torx) socket wrench, install the engine wire
harness protector with the 2 bolts.
Torque: 8.4 Nm (85 kgf cm, 74 in.lbf)
This is year/make/model specific to the 2nd Gen Sienna. Taken from the 05 Toyota Sienna repair manual. Hope this answers your torque specs for the valve covers which uses 10 mm bolts. If in doubt, as Scotty Kilmer asserts, do a "German tight".
Sure, depends on what engine, but often these are over-tightened thereby distorting valve cover and creating a leak. If they are cheap thin metal stamped covers they should always be checked and straighten as needed when changing gaskets. I usually use adhesive on gasket to the valve cover, but nothing or maybe thin layer of grease on side to engine. Most torque 5 to 7 or 8 ft lbs, but if you see the gasket swelling out around the bolt areas, that is too tight. Use blue loctite to keep bolts from coming loose.
Install a new head gasket on the engine, making certain it is
positioned correctly. The cylinder head dowel pins and the oil jet must
be in place. Refer to the illustrations if necessary.
Install the head. Lower it straight down onto the block, aligning it correctly.
Apply clean engine oil to the bolt threads and the contact face of the bolt head. Install the head bolts finger-tight.
On all models except 1988-89 DOHC Prelude and 1992-95 Preludes
with 2.3L and VTEC engines, tighten the head bolts following sequence A.
On 1988-89 DOHC Preludes, use sequence B. Use sequence C on 1992-95
Preludes with 2.3L and VTEC engines.
On 1984-89 Accords and 1984-91 Preludes, tighten the bolts in two
passes. The first pass should bring the bolts to about 22 ft. lbs. (30
Nm). On the second pass, tighten the bolts to their final torque of 49
ft. lbs. (68 Nm).
On 1990-93 Accords, tighten the bolts to 29 ft. lbs. (40 Nm) on
the first pass, 51 ft. lbs. (70 Nm) on the second pass, then tighten the
bolts to their final torque of 78 ft. lbs. (108 Nm).
On 1994-95 Accords and 1992-95 Preludes, the bolts
are also tightened in three passes. Tighten the bolts to 29 ft. lbs.
(40 Nm) on the first pass, 51 ft. lbs. (70 Nm) on the second pass, then
tighten the bolts to their final torque of 72 ft. lbs. (100 Nm).
Fig. Fig. 9: Cylinder head bolt torque sequence A
Fig. Fig. 10: Cylinder head bolt torque sequence B
Fig. Fig. 11: Cylinder head bolt torque sequence C
If applicable, assemble the intake and exhaust manifolds to the head. Use new gaskets.
If applicable, install the cam, rockers and camshaft holders.
If equipped, install the EGR crossover and air suction pipes.
Connect the exhaust pipe to the manifold using new nuts.
Install the timing belt.
Install the valve cover.
Install the cylinder sensor (if equipped) and the distributor.
If applicable, install the alternator.
Install the power steering pump, then connect the inlet hose to the pump.
Install the accessory drive belts. Adjust the belt tensions.
Install the heater hoses.
Install the cruise control actuator if it was removed.
Connect the spark plug wires. Connect all the wire harnesses and
vacuum hoses to the cylinder head, intake manifold and throttle
body/carburetor.
Connect the throttle control cable and/or accelerator cable at the throttle body.
Connect the fuel lines.
Install the brake booster, PCV and charcoal canister vacuum hoses.
Install the air cleaner and intake duct.
Refill the engine coolant. It is recommended that the engine oil be changed whenever a cylinder head is removed.
Connect the negative battery cable.
Start the engine, allowing it to idle. Bleed the cooling system.
Check the work area carefully for any signs of fluid leakage or any
indication of the timing belt rubbing or slapping the covers.
Locate the camshaft sprocket alignment mark in the 6 o'clock position and install the camshaft sprocket and timing chain
Camshaft sprocket bolts and tighten the camshaft sprocket bolts;
Torque to: 26 ft. lbs. (35 Nm)
Oil pump
NOTE: Do not lubricate the oil seal sealing surface.
Lubricate the outer edge of the oil seal with clean engine oil.
Lubricate the front cover oil seal bore with clean engine oil.
Install the crankshaft front oil seal with a suitable seal installer.
NOTE: Do not apply any type sealant to the front cover gasket (unless specified). Special tools are used to properly align the engine front cover at the oil pan surface and to center the crankshaft front oil seal.
Install the front cover gasket, cover, and bolts onto the engine.
Install the front cover-to-oil pan bolts and do not overtighten.
Tighten the cover bolts finger tight and do not overtighten.
J41480 installation-4.8L, 5.3L & 6.0L
Start the J41480 or other suitable tool to front cover bolts but don’t tighten the bolts yet.
NOTE: Align the tapered legs of the tool with the machined alignment surfaces on the front cover.
Seal alignment tool installation-4.8L, 5.3L & 6.0L
Install tool J41476 or other suitable tool.
Install the crankshaft balancer bolt and tighten the crankshaft balancer bolt by hand until snug but do not overtighten.
Tighten the J41480 bolts and front cover bolts;
Torque to: 18 ft. lbs. (25 Nm).
Remove the tools.
NOTE: Place a straight edge across the engine block and front cover oil pan sealing surfaces. Avoid contact with the portion of the gasket that protrudes into the oil pan surface. Insert a feeler gauge between the front cover and the straight edge tool. The cover must be flush with the oil pan surface or no more than 0.5 mm (0.02 in) below flush. If the front cover-to-engine block oil pan surface alignment is not within specifications, repeat the cover alignment procedure. If the correct front cover-to-engine block alignment cannot be obtained, replace the front cover.
Snug the oil pan-to-cover bolts in order to position the cover at the pan rail.
Tighten the oil pan-to-front cover bolts;
Torque to: 18 ft. lbs. (25 Nm).
Tighten the front cover bolts;
Torque to: 18 ft. lbs. (25 Nm).
Install the crankshaft balancer and bolt (See: Crankshaft Damper).
Install the water pump (See: Water Pump).
Fill the engine to the proper level with oil.
Fill the engine to the proper level with coolant.
Test drive the vehicle to confirm the repairs.
6.6L EngineTo Remove: NOTE: The 6.6L engine uses gears in place of a timing chain. For removal and installation, please see the Camshaft and Lifters procedure. This procedure covers the removal of the front cover and seal.
Before servicing the vehicle refer to the precautions at the beginning of this section.
Remove the upper intake manifold sight shield as follows:
Remove the retaining bolt in the front of the shield
Lift up on the front of the shield, then lift the shield off the rear bracket
Drain the cooling system.
Remove or disconnect the following:
Negative battery cables
Right front wheel
Right front fender splash shield
Upper fan shroud
Fan clutch (See: Engine Fan and Clutch)
Drive belt
Oil dipstick tube
Thermostat housing crossover
Crankshaft damper (See: Crankshaft Damper)
Crankshaft front oil seal
Water pump (See: Water Pump)
Camshaft sensor electrical connector
Camshaft sensor bolt and sensor
Crankshaft Position (CKP) sensor connector, bolt and sensor
CKP sensor spacer bolts and spacer
5 bolts securing the upper oil pan to the front cover
Bracket bolts and the bracket for the turbocharger outlet coolant pipe
Engine front cover bolts
Use a suitable seal cutter to separate the front cover from the cylinder block and upper oil pan
NOTE: Do not bend the turbocharger outlet pipe.
O-ring from the front cover
Engine front cover-6.6L engine
Oil pressure relief valve from the front cover
To Install:
Clean and inspect all sealing surfaces.
Install or connect the following:
Oil pressure relief valve with a new O-ring and tighten the valve
Torque to: 30 ft. lbs. (41 Nm)
Apply a 1/8 in. (2-3mm) wide to 1/16 in. (0.5-1.5mm) high bead of sealant to the front cover sealing surfaces to the engine block and oil pan.
Install or connect the following:
New front cover O-ring after lubricating it with engine oil
Front cover and bolts and tighten the front cover bolts
Torque to: 15 ft. lbs. (20 Nm)
Upper oil pan-to-front cover bolts and tighten the bolts
Torque to: 15 ft. lbs. (20 Nm)
Turbocharger coolant outlet pipe bracket and bolts and tighten the bolts
Torque to: 15 ft. lbs. (20 Nm).
Camshaft sensor and bolt and tighten the bolt
Torque to: 80 inch lbs. (9 Nm)
Camshaft sensor connector
NOTE: The CKP sensor spacers are machined with different timing positions. If you have to replace a spacer, make sure it has the same part number.
CKP sensor spacer and spacer bolts and tighten the bolts
Torque to: 89 inch lbs. (10 Nm)
CKP sensor and bolt and tighten the bolt
Torque to: 89 inch lbs. (10 Nm)
Water pump (See: Water Pump)
Crankshaft front oil seal
Crankshaft damper (See: Crankshaft Damper)
Thermostat housing crossover
Oil fill tube
Drive belt
Upper fan shroud
Right front fender splash shield and wheel
Negative battery cables
Refill the cooling system with the proper type and quantity of antifreeze.
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
×