Question about 1999 Chevrolet S-10 Pickup

1 Answer

4.3 liter, Rocker nuts back off at idle

4.3 liter engine, Have installed head gaskets and reassembled engine, but once valves were adjusted, the rocker arm nuts have no tension and back themselves off with engine idling. Do the studs and/or nuts need replacing?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 2,317 Answers

I would try using some Loctite Threadlocker, they offer different strengths, removable and non-removable.

Posted on May 15, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Need to know valve adjustment for 2012 ram 3500 turbo deisel and do you have to adjust the exaust valve n if so what is the spe. Tk. Joey


The 24-valve overhead system is a "low-maintenance"
design. Routine adjustments are no longer
necessary, however, measurement should still take
place when trouble-shooting performance problems,
or upon completion of a repair that includes removal
and installation of the valve train components or
injectors.
(1) Disconnect battery negative cables.
(2) Remove cylinder head cover (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - REMOVAL).
(3) Using the crankshaft barring tool #7471-B,
rotate crankshaft to align damper TDC mark to
12:00 o'clock position.
(a) If both number one cylinder rocker levers are
loose, continue to next step.
(b) If both number one clylinder rocker levers
are not loose, rotate crankshaft 360 degrees.
(4) With the engine in this position, valve lash can
be measured at the following rocker arms: INTAKE
1-2-4 / EXHAUST 1-3-5. Measure the valve lash by
inserting a feeler gauge between the rocker arm
socket and crosshead (Fig. 32). Refer to VALVE
LASH LIMIT CHART for the correct specifications. If
the measurement falls within the limits, adjustment/
resetting is not necessary. If measurement
finds the lash outside of the limits, adjustment/resetting
is required.
VALVE LASH LIMIT CHART
0.152 mm ( 0.006 in.)
MIN.
0.381 mm (0.015 in.)
MIN.
0.381 mm (0.015 in.)
MAX.
0.762 mm (0.030 in.)
MAX.
note:
If measured valve lash falls within these
specifications, no adjustment/reset is necessary.
Engine operation within these ranges has no adverse
affect on performance, emissions, fuel economy or
level of engine noise.
(5) If adjustment/resetting is required, loosen the
lock nut on rocker arms and turn the adjusting screw
until the desired lash is obtained:
² INTAKE 0.254 mm (0.010 in.)
² EXHAUST 0.508 mm (0.020 in.) Tighten the
lock nut to 24 Nm (18 ft. lbs.) and re-check the valve
lash.
(6) Using the crankshaft barring tool, rotate the
crankshaft one revolution (360°) to align the
damper TDC mark to the 12 o'clock position.
(7) With the engine in this position, valve lash can
be measured at the remaining rocker arms: INTAKE
3-5-6 / EXHAUST 2-4-6. Use the same method as
above for determining whether adjustment is necessary,
and adjust those that are found to be outside of
the limits.
(8) Install the cylinder head cover (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - INSTALLATION).
(9) Connect the battery negative cables.
need-know-valve-adjustment-2012-ram-3500-figxbmoxwg4zobk0gpscxd31-1-0.jpg

Jun 14, 2016 | Cars & Trucks

1 Answer

How to adjust valves on Toyota 1991 23re engine


Very carefully my friend. Kidding. Ok, remove the valve cover and anything in your way of removing it. By hand, with a socket and ratchet, on the crankshaft bolt head, turn the engine over to get #1 piston to top dead center on compression stroke. You'll need to find out what the valve lash should be in order to adjust properly, I run the 22R engines and only have specs for that, and have a feeler gage to place between the valve head and rocker arm. Check the gap on the intake valve for it is in position to adjust now because the cam lobe is at the farthest away from the valve. If it needs adjusted closer, turn the nut loose and screw the center in to tighten and out to give more gap, then tighten the jam nut after adjusted. Now turn the crank to bring #3 to top dead center and adjust that intake. Once done go back to #1 exhaust and adjust it. You'll know when the #3 is TDC when the rocker is loose on intake valve along with #1 exhaust. Now bring #4 piston up to TDC and adjust intake valve. Like I said, you'll know when it's @TDC when that rocker is loose, but with the spark plugs out you can stick a screwdriver in the plug hole to be sure it's up. Firing order on 4 cylinders is 1-3-4-2 so do your adjustment in that order for each intake valve and go back to the last one adjusted and do the exhaust valve.

Dec 01, 2014 | Toyota Cars & Trucks

1 Answer

"How to adjust 1996 jeep 4.0l lifters?


more than likely u have a rocker arm assembly on the jeep and the lifters are not adjustable in the event you can adjust them pull the valve cover using a ratchet and short ext. with the engine to operating temp at normal idle turn the nut on top of the rocker clockwise untill you the engine change idle then turn the nut back to the left one quarter turn you should heear the engine smooth out at that point if it does not back the nut off another eighth a turn or so this will put the lifter within specs and it should not be tapping in the event it is you will need to install new lifters

May 30, 2014 | 1996 Jeep Grand Cherokee

2 Answers

How to remove the cylinder head on a 1999 5.7 Tahoe


#1 first time ever the BEST suggestion Sent everyone away for the weekend unplug the stereo turn phone off. #2 take good pictures of both sides of the car engine compartment. borrow some fingernail polish several colors. drain coolant.disconnect battery Now lets start #1 remove air cleaner assemble there are 3 10mm nuts that hold it down unplug maf sensor and iat sensor and remove single wing nut on throttle body from drivers side remove main harness from bottom of fuse box 7mm bolt as you remove this harness taking it over the engine remove connectors and paint so you know where they go. Remove the four bolts that hold down a/c compressor and swing it out of the way DO NOT TAKE LINES OFF they will discharge the system From the front side take out the 3 upper bolts and 2 lower bolts and one behind power steering pump just slide it forward to get to the front intake bolt . remove upper radiator hose and heater and bypass hoses. remove alternator. remove bracket that alt sits on a hidden bolt behind tensioner so remove it first. now unscrew outer throttle cable this one is the cruise control and remove inner cable but holding throttle plate open with hand in bore it has a round lead ball on it. take mounting brackets off 3 nuts and 1 stud remember how this goes together. now remove rear mount holder and place them over master cylinder area.remove EGR pipe in front of manifold 7/8 wrench in the center where you removed the injector wiring connector rectangular plug there are to 8mm nuts that hold down the fuel lines remove nuts and retainer plate DO NOT remove lines yet follow those lines back and remove both lines 16mm nuts and in the center a 10mm bolt now remove lines as a assemble. Now you can see the flat distributor cap remove cap 20 torx with cap off rotate engine so rotor points at twelve straight towards radiator. Beer break After leaving ten cans all over yard remove distributor hold down bolt THIS PART IS IMPORTANT BECAUSE THERE IS NOT TIMING ADJUSTMENT FOR THIS ENGINE. as the distib come up the shaft rotates place a dot of polish to index the installation. now remove the intake bolts 8 bolts 13mm with slight pressure under a corner it should pop up for removal. Now jack up and support car remove the 3 15 mm nuts or 9/16 off each manifold get flanges clear drop back down now remove spark plugs then exhaust manifold bolts 6 per side 15mm If you can get the exhaust manifolds out great most of the time they don't . remove valve covers DO NOT REMOVE ROCKER ARMS remove the inner head bolts 9 bolts 5/8 heads (7 long bolt 2 short ) and the 8 lower bolts on the back of the head are the ground cables to the computer one per side some also has a braided cable and a fuel line retainer clip. once these are removed place a small piece of pipe in the intake port and pull they are on there but should come easy once lifted up a little remove push rods these can go in a pile they all are the same length. either send heads out for pressure test and surfacing or find that the gaskets are bad. Cleaning DO NOT SMOKE the intake valley and block head gasket surface must be clean of gasket material suggest kerosene and a soft bristle brush and sand paper use a tap 7/16 by 14 thread chase bolt holes so the bolts turn easy during installation. once this is done drain engine oil and install a new filter.. clean valve covers and intake manifold separate plastic top from bottom clean inside and replace gaskets torque to specs. Once heads are back clean all mounting holes for even torque. buy new head bolts they have thread sealer on them so coolant can't wick up bolts and leak into engine. now install the heads do not worry about the push rods yet . FOLLOW A REPAIR MANUEL FOR TORQUE SEQUENCE. once done install push rods and seat into lifter cup remove nut counting the turns to get rocker arm over rod and return to that setting they all will be different number of turns. Now reassemble in reverse order. Many other Questions e-mail jacobs.daniel@sbcglobal.net good luck

May 02, 2014 | 1999 Chevrolet Tahoe

1 Answer

1996 vortec 5.7. how do I adjust rocker arms when the motor is cold?


these are adjusted the same way 5.7 litre motors have been adjusted since GM started making this size of motor. with every thing in place tighten rocker nuts down until about 1/16" threads is protruding above nut. once the car starts allow the engine pressure to build and oil is squirting around rockers. then with engine running tighten down rockers that are noisy until the noise has just gone. then back off nut until it starts to clatter then tighten 3/4 of a turn. repeat to all the other rockers and your done.

Jan 08, 2013 | Chevrolet 1500 Cars & Trucks

1 Answer

Do i torque my rocker arms down on '88 caprice w/307 ? if so what is the torque specs on them


The nut is a self locking nut. so there is no torque spec for them. What you do is set a preliminary clearance with the tappets pumped up, then set final clearance/lash when engine is fired up initially.

The engine is started and allowed to come up to operating temperature- put foil over the hole in the pushrod end of the rocker arm to reduce oil spray, nut is backed out slowly until clatter is heard, and the nut slowly tightened until noise just disappears, then the nut is tightened in 1/4 turn steps until 1 full turn in has been reached. At each 1/4 turn pause, allow engine idle to smooth out before proceeding.

Once all valves are adjusted, you are ready to put the covers back on and finish the rest of the assembly.

For initial set point, when building the engine up, make sure the cam lobe is on the heal (no lift) portion of the cam, and pump up the lifter until significant resistance is felt, and tighten the rocker adjusting nut until you you feel actual resistance to turning the pushrod. move to the next valve.

Jan 09, 2012 | Cars & Trucks

2 Answers

Valve lash procedure


i need to know how to adjust the valves on 02 pont sunfire

Nov 20, 2011 | 1991 Chevrolet K1500

1 Answer

How to adjust1997 chevy 5.7 liter rocker arm adjustment


There are different ways, but here is the most common way. With the engine running at idle, loosen the rocker nut until there is a noticeable tap, slowly tighten the nut until the tap is gone and tighten 1/2 turn more. There are clips that are low in cost or an old valve cover cut in half makes a good cover to do the adjustment with out slinging oil every where.Hope this helps FixYA up.

Sep 21, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

There is a tapping noise in the motor but its not knocking I think its a lifter it hasent lost any power and its really not getting worse I would like to know what the spec is for tighing down the lifter...


Depends on which engine you have. If you have


ADJUSTMENT Although it is sometimes possible to reuse an old cylinder head cover gasket, in most cases it makes more sense to purchase a new one before beginning the procedure. Some vehicles may require the use of silicone sealant either with or without a new cover gasket. For more details, please refer to the cylinder head cover procedures in Engine & Engine Overhaul of this repair guide and refer to the gasket manufacturer's instructions.

Z24i Engine
See Figures 1, 2 and 3
For the intake valves: 1-4-5-8 valve clearance is 0.012 in. (0.30mm). For the exhaust valves: 2-3-6-7 valve clearance is 0.012 in. (0.30mm). The pivot locknut torque specification is 12-16 ft. lbs. (16-22 Nm).

  1. The valves must be adjusted with the engine warm, so start the truck and run the engine until the needle on the temperature gauge reaches the middle setting. After the engine is warm, shut it off.
  2. Note the location of any wires and hoses which may interfere with cylinder head cover removal, disconnect them and move them to one side. Remove the bolts holding the cylinder head cover in place and remove the cover. Remember, the engine will be hot, so be careful!

fb38656.gif


Fig. Fig. 1: Check the valve clearance with a flat feeler gauge-Z24i engine





e459ab8.gif

Fig. Fig. 2: Loosen the locknut and turn the adjusting screw to adjust the valve clearance-Z24i engine


1c1d35c.gif


Fig. Fig. 3: With the No. 1 piston at TDC, adjust the top set of valves FIRST; with the No. 4 piston at TDC, adjust the bottom set of valves SECOND-Z24i engine

  1. Rotate the crankshaft until the timing marks indicate that the No. 1 piston is at TDC of the compression stroke. If you're not sure of which stroke you're on, remove the No. 1 spark plug and hold your thumb over the hole. Pressure will be felt as the piston starts up on the compression stroke.
  2. Refer to the accompanying illustration (upper part), then check valves (1), (2), (4) and (6) using a flat bladed feeler gauge. The feeler gauge should pass between the valve stem end and the rocker arm screw with a very slight drag. Insert the feeler gauge straight, not at an angle.
  3. If the clearance is not within the specified value, loosen the rocker arm lock nut and turn the rocker arm screw to obtain the proper clearance. After correct clearance is obtained, tighten the locknut.
  4. Rotate the crankshaft until the timing marks indicate that the No. 4 piston is at TDC of the compression stroke. If you're not sure of which stroke you're on, remove the No. 4 spark plug and hold your thumb over the hole. Pressure will be felt as the piston starts up on the compression stroke.
  5. See the illustration (lower part), then check valves (3), (5), (7) and (8). Check and adjust valve clearance as necessary.
  6. Install the cylinder head cover gasket, the cover itself and any wires or hoses which were removed. Check the engine oil level.

KA24E, VG30i and VG30E Engines
See Figures 4 and 5
These models utilize hydraulic valve lifters. Periodic adjustment is neither necessary or possible. There is however a bleed down procedure that is necessary when the valve train has been disassembled.
HYDRAULIC LIFTER BLEED DOWN
  1. Remove the cylinder head cover.
  2. Check the lifters for proper operation by pushing hard on each lifter with fingertip pressure.
  3. If the valve lifter moves more than 0.04 in. (1mm), air may be inside it. Make sure the rocker arm is not on the cam lobe when making this check.
  4. Install the cylinder head cover.
  5. If there was air in the lifters, bleed the air by running the engine at 1000 rpm for 10 minutes.


4df22a2.gif


Fig. Fig. 4: Cross-sectional view of an installed hydraulic valve lifter-4 cylinder engine


6e01bb3.gif


Fig. Fig. 5: Cross-sectional view of an installed hydraulic valve lifter-6 cylinder engine

Oct 29, 2010 | 1989 Nissan Hardbody King

1 Answer

I need a diagram of a 1995 ford escort engine


96 escort 1.9L

bb97132.gif
e0d7524.gif

Engine Components
Item Part Number Description 1 6766 Oil Filler Cap 2 6A548 (8 Req'd) Valve Cover Bolt 3 6582 Valve Cover 4 — Exhaust Manifold Shield-to-Exhaust Manifold Nut (4 Req'd) 5 9A462 Exhaust Manifold Shield 6 — Exhaust Manifold Shield Stud (4 Req'd) 7 9430 Exhaust Manifold 8 9454 Exhaust Manifold Nut 9 9448 Exhaust Manifold Gasket 10 — Exhaust Manifold Stud (Fine Thread), Short (4 Req'd) 11 — Exhaust Manifold Stud, Long (1 Req'd) 12 — Exhaust Manifold Stud (Medium Thread), Short (1 Req'd) 13 6518 Valve Spring Retainer Key 14 6514 Valve Spring Retainer 15 6513 Valve Spring and Damper, Intake 16 6C515 Valve Tappet Guide Plate Retainer 17 6571 Valve Stem Seal 18 6513 Valve Spring, Exhaust 19 12405 Spark Plug 20 6269 Camshaft Thrust Plate 21 — Camshaft Thrust Plate Bolt (2 Req'd) 22 — Cup Plug 23 6B273 Camshaft Oil Flow Control Rod 24 6K292 Camshaft Front Seal 25 6256 Camshaft Sprocket 26 6278 Camshaft Sprocket Washer 27 6K252 Camshaft Sprocket Retaining Bolt 28 6L269 Camshaft Sprocket Key (5 x 18) 29 6250 Camshaft 30 6051 Head Gasket 31 6A008 Cylinder Head to Block Dowel 32 6010 Cylinder Block 33 6507 Intake Valve 34 6505 Exhaust Valve 35 6049 Cylinder Head 36 — Intake Manifold Stud (7 Req'd) 37 17A084 Engine Lifting Eye 38 — Engine Lifting Eye Bolt (2 Req'd) 39 9439 Intake Manifold Gasket 40 — Bolt 41 9723 Accelerator Cable Bracket 42 9424 Intake Manifold 43 — Intake Manifold Nut (7 Req'd) 44 9D476 EGR Valve Gasket 45 — Exhaust Gas Recirculation (EGR) Valve Bolt (2 Req'd) 46 9D475 EGR Valve 47 — Fuel Injection Supply Manifold Bolt
(2 Req'd) 48 9F593 Fuel Injector 49 9D930 Fuel Charging Wiring 50 6786 Oil Level Indicator Tube Bracket 51 — Oil Level Indicator Tube Bracket Bolt 52 6754 Oil Level Indicator Tube 53 6750 Oil Level Dipstick 54 9D280 Fuel Injection Supply Manifold 55 — Vacuum Fitting 56 9E498 Main Emission Vacuum Control Connector 57 — Vacuum Tap 58 — Vacuum Hose 59 9B989 Throttle Position Sensor 60 — Screw and Washer 61 9F782 Throttle Position Sensor Gasket 62 — Throttle Body Bolt (4 Req'd) 63 — Idle Air Control (IAC) Valve Bolt
(2 Req'd) 64 9F715 Idle Air Control Valve 65 9F670 Idle Air Control Gasket 66 9E926 Throttle Body 67 9E936 Throttle Body Gasket 68 — Vacuum Fitting 69 — Camshaft Position Sensor Screw 70 6B288 Camshaft Position Sensor 71 8255 Water Hose Connection Gasket 72 — Water Hose Connection Bolt (3 Req'd) 73 8592 Water Hose Connection 74 8575 Water Thermostat 75 6065 Cylinder Head Bolts 76 6500 Valve Tappet 77 6K512 Valve Tappet Guide Plate 78 6564 Rocker Arm 79 6A528 Rocker Arm Seat 80 6A527 Rocker Arm Bolt (8 Req'd) 81 — Ignition Coil Mounting Bracket Bolt
(3 Req'd) 82 18827 Noise Filter Condenser 83 — Ignition Coil Mounting Bolt (4 Req'd) 84 12259 Spark Plug Wire Set 85 12029 Ignition Coil 86 12043 Ignition Coil Mounting Bracket A — Tighten to 5-12 Nm (4-9 Lb-Ft) B — Tighten to 5-7 Nm (3-5 Lb-Ft) C — Tighten to 21-26 Nm (16-19 Lb-Ft) D — Tighten to 2-10 Nm (1.5-7 Lb-Ft) E — Tighten to 8-13 Nm (6-9 Lb-Ft) F — Tighten to 40-55 Nm (30-41 Lb-Ft) G — Tighten to 16-20 Nm (12-15 Lb-Ft) H — Tighten to 20-30 Nm (15-22 Lb-Ft) I — Tighten to 8-10 Nm (6-8 Lb-Ft) J — Tighten to 8-11 Nm (6-9 Lb-Ft) K — Tighten to 23-30 Nm (17-22 Lb-Ft) L — Tighten to 20-40 Nm (15-30 Lb-Ft) M — Tighten to 4.5-7 Nm (3-5 Lb-Ft) N — Tighten to 18-26 Nm (13-19 Lb-Ft)

Feb 24, 2009 | 1995 Ford Escort

Not finding what you are looking for?
1999 Chevrolet S-10 Pickup Logo

Related Topics:

107 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8273 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...