Question about 2003 Ducati 998

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998 Cylinder Balancing

I recently noticed (as I was checking valve clearances) on my 998

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That when opening the throttle the front butterfly seems to open fully but the rear butterfly stop short by a few degrees. In other words, front and rear butterflies do not open exactly the same amount. The bike has done 9k miles and apart from maintenance and valve checks, have never bveen worked on. It is in pristine condition, runs great and pulls strong well beyond the 10k redline. I have not had 4V desmo's before and therefore cannot compare power wise, but she feels rather quick to me. For what its worth, it has the 50mm Termi half system and matching ECU. Is this normal and just a result of the factory balancing exercise?,The length of the throttle linkage rod is set in the factory on a test bench. It is a brave person that messes with that linkage rod. What is more accurate is to do a cylinder balance using carb sticks to check if cylinders are balanced on idle. If they are out by one or two degrees at full throttle the difference is minmal and not something that an average street rider should worry about. (When is the last tiem you were banging off the limiter for extended periods of time?) At the same time check your throttle stop set screws to see if they are in the correct place. If the cylinders are balanced at idle I would not worry about it.,,,

Posted on Nov 10, 2008

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Posted on Jan 02, 2017

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Hey there I need the exhaust and Intake(valve) clearance for a komatsu 300-6 please


note Perform the valve clearance check and adjustment at the engine cold state. 1.Remove all of the ignition coils. 2.Remove the cylinder head cover.
caution Turn the crankshaft always clockwise. 3.Turn the crankshaft clockwise, and align the timing mark on the exhaust camshaft sprocket against the upper face of the cylinder head as shown in Figure. Therefore, No.1 cylinder goes to the compression top dead center. 4.Using a thickness gauge, measure the valve clearance with the arrow shown in Figure. If deviated from the standard value, make note for the valve clearance.
Standard value:

    Intake valve 0.20 ± 0.03 mm (0.008 ± 0.0012 inch)
    Exhaust valve 0.30 ± 0.03 mm (0.012 ± 0.0012 inch)
5.Turn the crankshaft clockwise 360 degrees, and put the timing mark on the exhaust camshaft sprocket in position shown in Figure. Therefore, No. 4 cylinder goes to the compression top dead center. 6.Check the valve clearance with the arrow shown in Figure. In the same procedure as 4.
7.If the valve clearance is deviated from the standard value, remove the camshaft and the valve tappet. For the camshaft removal, refer to Camshaft Removal and Installation . 8.Using a micrometer, measure the thickness of the removed valve tappet. 9.Calculate the thickness of the newly installed valve tappet through the following equation.
A: thickness of newly installed valve tappet
B: thickness of removed valve tappet
C: measured valve clearance
Equation

    Intake valve: A = B + [C - 0.20 mm (0.008 inch)]
    Exhaust valve: A = B + [C - 0.30 mm (0.012 inch)] note The valve tappet ranges 3,000 - 3,690 mm (0.1181 - 0.1453 inch) and has 47 types per 0.015 mm (0.0006 inch). The thickness below a decimal point is stamped on the reverse side of the valve tappet. 10.Install the valve tappet selected through the procedure 9, and put the camshaft in position. For the camshaft installation, refer to Camshaft Removal and Installation .
    11.After installing the timing chain, measure the valve clearance using the procedure 3 to 6. Confirm the clearance is within the standard value.
    caution Completely remove all the old FIPG, which might be remaining among the components. 12.After completely removing the liquid gasket adhering on the timing chain case, cylinder block and cylinder head, degrease them with white gasoline.
    caution The cylinder head cover should be installed within 3 minutes of applying liquid gasket.
13.Apply a 4 mm bead of liquid gasket as illustrated.
Specified sealant:
    THREE BOND 1217G or equivalent
14. Install the cylinder head cover and tighten the tightening bolts using the following procedures.
(1) Temporarily tighten to the following torque in order shown in the illustration.
Tightening torque: 3.0 ± 1.0 N·m (27 ± 8 in-lb)(2) Tighten to the specified torque in order shown in the illustration.
Specified torque: 5.5 ± 0.5 N·m (49 ± 4 in-lb)15.Install the ignition coils.

Jan 23, 2017 | Cars & Trucks

1 Answer

Gas started blowing out the back of the air filter...I noticed the hose connects to a valve that appears loose (spins) is that my issue?


It could be timing off, miss firing ona cylinder, exhaust blocked. when running there is a vacuum on the intake manifold any of the issues i mentioned will cause back pressure. Check also intake valve clearances

Feb 14, 2015 | Lifan Pro-Series 8500ie Electric Start...

1 Answer

Timing belt problems


IF the belt slipped or broke there may be damage. to check for valve damage remove valve tappet cover and check valve clearance ,if the clearance is excessive there is damage . bent valves and damaged pistons .

Jul 03, 2014 | Holden Astra Cars & Trucks

1 Answer

OVER SKIMMED CYLINDER HEAD VW PASSAT 2.0 FSI


that is alot of machining off the head? I would double check the valve timing first, then valve clearances. it that is no good you will have to replace the head and then kick your machinist up the bumb for cutting so much off

Nov 25, 2013 | Cars & Trucks

1 Answer

Valve settings


- Pull the hand brake and put transmission in neutral.
- Remove spark plug cords.
- Remove the spark plugs.
- Remove the Tappet cover
- Lift up the left front wheel.
Cylinder number 1 is toward the pulleys and belts side.
- Rotate the crankshaft anticlockwise with socket and extension rod and bring the valve tappets (intake and exhaust) No. 4 cylinder on dancing position.
NOTE: THERE ARE OTHER WAYS ALSO TO ADJUST THE FOUR VALVES AT A TIME. BUT AS DIY FOLLOW THE FOLLOWING METHOD TO AVOID ANY CONFUSION.
- Adjust the valve clearance of number 1 cylinder.
Valve clearance:
Intake 0.18 - 0.22 (cold) Exhaust 0.25 - 0.28 (cold)
- Rotate the crankshaft anticlockwise to bring the valves of cylinder 2 on dancing position and adjust the valves of No. 3 cylinder.
- Similarly rotate the crankshaft to bring the valves of No. 1 cylinder on dancing position and adjust the valves of No. 4.
- Rotate the crankshaft anticlockwise to bring the valves of cylinder No. 3 on dancing position and adjust the valve clearance of No. 2 cylinder.

May 04, 2013 | 1999 Honda Civic

2 Answers

Please assist with Cylinder Head Torque and Valve Clearance Specs for Tata Indica 1.4 LXi


i need the head talk settings & valve clearance for tata indica lxi

Apr 20, 2013 | 2006 Tata Indica LXi

1 Answer

I need the required valve & inyector clearance on a M11 engine


Cummins M11

Intake valve clearance 0.010 inch
Exhaust valve clearance 0.024 inch

The firing order is 1-5-3-6-2-4 and that is the order the valves should be adjusted started with first timing mark on main pulley adjust cylinder number 1 The valves and injector should be adjusted at the same time The crankshaft is then rotated 120 degrees to next timing mark and cylinder 5 is adjusted, the crank is rotated again 120 degrees to next timing mark and cylinder 3 is adjusted.then back to the first timing mark, cylinder 6 is adjusted, etc/

Adjusting nut on plunger should be adjusted to the point where you feel the plunger just reaches the bottom.of travel/bottoms out.

Feb 15, 2012 | 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!

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





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


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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.


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


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

Oct 29, 2010 | 1989 Nissan Hardbody King

1 Answer

Hi,im looking for valve clearance specs for the kawaski 23hp fh680v-8s10 motor ??


The adjustment is .003 - .005. You must hold the rocker arm by lifting up on the valve depressing side and pressing down on the push-rod side while making the adjustment. Any other means of adjustment and it will be incorrect.

Below is quoted from the service manual without pictures
(FixYa Note TORQUE on lock screws is 61 inch pounds)

Valve Clearance Inspection
NOTE
?? Valve clearance must be checked when the engine is cold (at room
temperature).
• Remove the rocker cover (see Cylinder Head Removal).
• Place the piston at top dead center (TDC) of the compression stroke
turning the crankshaft clockwise facing the flywheel.
No.1 Cylinder:
?? The left projection [A] on the flywheel is faced with the right leg [B]
on the #1 ignition coil [C] as shown.
?? Check the intake and exhaust valves are closed completely, if not turn
the flywheel one turn (360??) clockwise and face the left projection with
the right leg again.
No.2 Cylinder:
?? The left projection [A] on the flywheel is faced with the right leg [B]
on the #2 ignition coil [C] as shown. Follow No.1 Cylinder alignment.
• Then check the valve clearance.
?? Using a thickness gauge [A], measure the valve clearance between
the rocker arm [B] and the valve stem end.
If the valve clearance is incorrect, adjust it.
Valve Clearance (when cold)
Intake, Exhaust 0.075 0.125 mm (0.003 0.005 in.)

Thanks for using FixYa.

Kelly

May 18, 2010 | Garden

1 Answer

Valve maintenance


Valves are actuated only recently at Moto Guzzi by an overhead camshaft. Shim under bucket design precludes consumer adjustment due to shim kits price/availability. But it can be done! Not sure what the interval is, usually needs it between 12k miles, and 20k miles. If you hear noticeable tapping that doesn't quiet after warmup, it is time to check clearances. Good Luck, and nice bike, by the way. TT

Feb 10, 2009 | 2008 Moto Guzzi V7 Special

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