Question about 1989 Nissan Sentra 4 Door

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Cylinder head I have a 1989 sentra 1.6 SGLI. Mybe the person who fitted the head was less knolegable. It does not balance well after fitting and the car would just cut-off but when started it gives no problem. We did replace bearings before fitting the head as no.3 piston had oil on top of the pistol. does it need special setting or any one can? Shold I replace the head with a recon one, but it seems hard to find one separated from the block.What else.

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  • Anonymous Oct 31, 2008

    mi auto no le resiste la reversa

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Cylinder head are nissan sentra's no 1 problem. you should've done a pressure test on ur head. if dats okay, replace the bolts as they wear out over the years....torgue as per manufactoring specs...

Posted on Aug 14, 2008

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What is the torque settings for polo bah motor big ends :mains and cylinder head


CHECK BELOW..
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Tightening torques
Bolted connections Tightening torque
Bolts, nuts M 6 10 Nm
M 8 20 Nm
M 10 45 Nm
M 12 60 Nm
Deviating from above
Exhaust pipe to manifold 40 Nm
Installation
Note
t Only remove the new cylinder head gasket from its packing immediately before installing.
t Handle the new gasket with extreme care. Damaging will lead to leaks.
- Place a clean cloth in cylinders so that no dirt or emery cloth particles can get in between cylinder wall and piston.
- Also prevent dirt and emery cloth particles from getting into the coolant.
- Carefully clean cylinder head and cylinder block sealing surfaces. Thereby ensuring that no scoring or scratches are formed (when using abrasive paper the grade must not be less than 100).
- Carefully remove metal particles, emery remains and cloths.
- Set No. 1 cylinder piston to TDC and then turn crankshaft back slightly.
- To centralize, screw guide pins from 3450/1 into front outer holes for cylinder head bolts-flechas-.
- Place the new cylinder head gasket in the centralizing pins -A-. Lettering (Part No.) must be readable.
- Fit cylinder head, screw in 8 remaining cylinder head bolts and tighten by hand.
- Remove the guide pins with tool 3450 by the bolt holes. To do this, turn the tool left until the pins are removed.
- Fit remaining cylinder head bolts and tighten hand-tight.
- Tighten cylinder head in tightening sequence as follows:
- Tighten all bolts to 30 Nm.
- Then tighten all bolts a 1//4 turn (90 °) further using a rigid wrench.
- Then tighten all bolts again a 1/4 turn (90 °) further.
Note
There is no requirement to retighten the cylinder head bolts after repairs.
The rest of the assembly is basically a reverse of the dismantling sequence.
Note
When the camshaft is turned, the crankshaft must not be at TDC. Danger of damage to valves or piston crowns.
Installing toothed belt and adjusting valve timing > Chapter.
Filling with new coolant > Chapter.
- Interrogate fault memory > Chapter.

Feb 21, 2015 | 2006 Volkswagen Polo 1.6

1 Answer

Excessive carbon on spark plugs which causes to fail


carbon on sparkplugs are caused by oil in the combustion chamber.

here are some things to do:
1. replace the sparkplug
2. replace your head gasket
3. check if your ignition timing is correct (timing in the distributor, camshaft, and crankshaft)

if these does not solve your problem, try this:
1. have your cylinder head checked for leaks/cracks
2. replace your piston rings

lastly, if all of these dont work, this is the solution (but quite pricey)
1. have your head rebored. reboring the cylinder head means making your combustion chamber wider so cracks/leaks on the wall will be removed.
2. after rebore.. you have 2 options: resleeve or replace piston rings. Resleeve means inserting sleeves in the bored chamber to replace the removed part. replacing pistong rings is also an alternative since your old one will not fit anymore ot the rebored head.

Aug 12, 2011 | 1992 Nissan Sentra 4 Door

1 Answer

I have a 2000 nissan sentra my harmonic balance is bad according to a autozone person it moves when the car is on and he told me it needs to be replaced because it has play i need to replace and find out...


The harmonic balancer is integrated with the crankshaft pulley, and if replaced requires taking the bolt out from the side of the 4 cyl. engine.

I would recommend that an experience engine rebuilder perform the service.

Inspect the Harmonic Balancer:

The harmonic balancer (vibration damper) is inspected for signs of wear in its center bore.
  • Also inspect the rubber mounting for indications of twisting and deterioration.
  • The outer ring can slip, causing an out of balance condition. Replace any harmonic balancer that has slipped.
  • With the cylinder head removed and the piston at top dead center (TDC), make a visual comparison. Do the timing marks for TDC on the timing cover and damper appear to be accurate.
  • Be sure the damper is the correct one for the vehicle. The wrong one can be worse than none at all.
  • Sometimes a damper can become loose on the crank. Check the keyway for wear that can result from improper damper installation, the wrong size key, or a loose damper hub to crank fit.
  • Be sure all pulleys are straight. A damaged pulley can force a crankshaft to bend during engine operation.
This is a general guide on replacing the harmonic balancer, but there are other instructions that the rebuilder would follow to actually do the service for you:

To remove the harmonic balancer, the cylinder head and timing cover must be removed and the piston should be at top dead center (TDC).
  • Install the vibration damper by pounding it on, or use a special installation tool.
  • Generally, the damper is installed unit it bottoms out against the oil slinger and the timing sprocket.
  • If in doubt, install the water pump and pulley, and then pound the damper into place until its pulley aligns with the water pump pulley.
  • It is advisable to use the installation tool, because pounding on the damper can cause stress on the crank thrust bearing surface.
  • It is best to stand the engine block on end and support the crankshaft if the damper must be pounded on.
  • Some vibration dampers are not pressed-fit on the crankshaft.
  • Be sure to install a large washer behind the damper retaining bolt on these engines; otherwise, the damper might fly off, causing damage and a safety hazard.

Feb 09, 2011 | Nissan Sentra Cars & Trucks

1 Answer

PROCEEDURE FOR FITTING CYLINDER HEAD TO QR20DE


pls let me know the unit of torque to tightened the cylinder head of engine model nissan QR20DE

Jan 12, 2010 | 2003 Nissan Sentra

1 Answer

How i fix timing of lantra 1600 cc 95


Disconnect battery earth lead. Do not turn crankshaft or camshaft when timing belt removed. Remove spark plugs to ease turning engine. Turn engine in normal direction of ratation unless otherwise stated, Support engine. Remove, engine mounting, auxilliaty drive belts. Water pump pulley 1. Crankshaft pulley bolts 21. crankshaft pully 2. timing belt covers 3. Turn crankshaft to TDC on No 1 cyclinder. Ensure crankshaft sprocket, camshaft sprocket, oil pump sprocket and balancer shaft sprocket timing marks aligned. Timing marks on camshaft sprockets should align with cylinder head upper face. Dowel pins on camshaft sprockets should face upwards. Slacken tensioner bolt. Move tensioner away from belt and lightly tighten bolt. Remove, automatic tensioner unit bolts. Automatic tensioner unit. Timing belt, crankshaft centre bolt, crankshaft sprocket. Crankshaft sprocket guide washer. Slacken blancer shaft belt tensioner bolt. Move tensioner away from belt and lightly tighten bolt. Remove balancer shaft belt.

Installation
Ensuring timing marks arligned. Note timing marks on camshaft sprockets should align with cylinder head upper face. Exhaust sprocket mark is on recess, but inlet sprocket mark is on tooth. Note: to check oil pump sprocket positioned correctly, removing blanking plug from cylinder block. Insert 8mm diameter Phillips srcrewdriver in hole. Ensure screwdriver is inserted 60mm from face of cylinder block. if screwdriver can only be inserted 20mm: turn oil pump sprocket 360°. Insert screwdriver again. Fit balancer shaft belt in anti-clockwise direction, starting at crankshaft sprocket. Slacken balancer shaft belt tensioner bolt. Turn tensioner clockwise to tension belt. Tighten bolt to 15-22Nm. Apply thumb pressure to belt. Belt should deflect 5-7 mm. If not repeat tensioning procedure. Install crankshaft sprocket guide washer, crnakshaft sprocket. Tighten crankshaft cente bolt. Tighten torque:110-130 Nm. Note ensure crankshaft sprocket guide washer is fitted correclty. Oil treads and contact face of crankshaft body before fitting. Check tensioner body for leakage or damage replace if necessary. Check pushrod protrusion is 12mm. If not replace automatic tensioner unit. Slowly compress pushrod into tensioner body until holes aligned. Resistance should be felt. Place flat washer under tnesioner body to avoid damage to body end plugs. Retain pushrod with suitable pin through hole in tensioner body. install automatic tensioner unit to cylinder block. Tighten bolts to 22-27Nm. Fit timing belt in anti-clockwise direction, starting at the tensioner pulley. Slacken tensioner pulley bolt. Turn tensioner pully clockwise to temporarily tension belt. Tighten bolts to 43-45Nm. Turn crankshaft slowly 1/4 turn anti-cockwise. Turn crankshaft clockwise until timing marks alligned. Slacken tensioner pully bolt. Fit tool to tensioner pulley. Tool No 09244 28100. Apply clockwise torque of 2,6-2,8 Nm to tensioner pulley. Tighten bolt to 43-45Nm. Insert special tool in timing belt rear casing. Tool no 09244-28000. Screw in tool until pin can be removed from automatic tensioner unit. Remove special tool. Tool nr 09244-28000. turn crankshaft two turns clockwise. Wait 15 minutes. Ensure timing marks aligned. Check extended length of pushrod is 3,8-4,5mm. Install components in reverse order of removal. Tighten crankshaft pulley bolts, Tighten torque 20-30Nm

Nov 01, 2009 | 1995 Hyundai Elantra

1 Answer

I need to replace my timing belt on my hyundia elantra 2003 with 1997 cc engine


Dear Friend
Removal: Support engine: remove -engine mounting, auxiliary drive belt, water pump pulley, crankshaft pully bots & crankshaft pully, timing belt covers....turn crankshaft to TDC on No 1 cylinder, ensure crankshaft sprocket, camshaft sprocket, oil pump sprocket & balancer shaft sprocket timing marks lighned. Pls note: Timing marks on camshaft sprockets should align with cylinder head uppter face, dowl pins on camshaft sprockets should face downwards....Slacken tensioner botl. Move tensioner away from belt & tighten bolt.
Remove: automatic tensioner unit bolts, automatic tensioner unit, timing belt, crankshaft bolt, crankshaft sprocket, crankshaft sprocket guide washer...slacken balancer shaft belt rensioner bolt, move tensioner away from belt & lightly tighten bolt...Remove balancer shaft belt.

Installation:
ensure timeing marks aligned.Note: Timing marks on camshaft sprockets ahould align with cylinder head upper face, exhaust sprocket mark is on recess but inlet sprocket mark is on tooth. To check oil pump sprocket positionded sorrectly: remove blanking plug from cylinder block, insert 8mm diameter Phillips screwdriver in hole. ensure screwdriver is inserded 60mm from face of cylinder block. If screwdriveer can only be inserted 20mm-turn oil pump sprocket 360". Inset screwdiver again.
Fit balancer shaft delt in anti-clockwise direction starting at crandkshaft sprocket....Slacken balancer shaft belt tensioner notl, turn tensioner clockwise to tension belt. Tighten bolt to 15-22 Nm... Applu thump pressure to belt at tentioner, belt should deflect 5-7mm. If not: Repeat tensioning procedure.... Install - chankshaft sprocket guide washer & crankshaft sprocket.
Thighten crankshaft centre bolt, tightening torque:110-130Nm. Please note, ensure crankshaft sprocket guide washer is fittet correctly. oil threads & contact face crankshaft botl before fitting.

Sep 21, 2009 | Hyundai Elantra Cars & Trucks

1 Answer

Engine misses cold and then after its warmed up runs good.


U have a leaking cylinder head gasket, both symptoms fit perfectly.

Mar 27, 2009 | 2003 Nissan Sentra

1 Answer

Hi I ned to know about head bolt torque nissan sentra 1997


hi.im a mechanic from the philippines.the torque of all your cylinder head for your nissan sentra 1997 is 60 nm.apply 30 nm of torque first on all the cylinderhead bolts then torque it agian directly to 60 nm. i also drive and repair nissan cars.

Aug 07, 2008 | 1989 Nissan Sentra 4 Door

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