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What is causing the problem why has the gasket failed for the second time, I have tightened it down to the correct settings?

I fitted a new head gasket to a classic min I today however it failed I have had the head skimmed tried a second gasket and that looks like it has also failed?

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Try this:

www.youtube.com
and search for "Torque Head Bolts"
This is a good video.
Hope this helps.

Posted on Mar 30, 2015

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  • Cars & Trucks Master
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You didn't torque each head bolt properly or its not the head gasket and it is a cracked cylinder.

Posted on Mar 30, 2015

Testimonial: "Yes torqued it down in the correct order with a torque rench I could not see any cracks in the cylinders the car starts fin e however steam come out of the oil filler cap?"

  •  johnny rebel
    johnny rebel Mar 30, 2015

    you wont see minor cracks,when it gets hot the crack will expand,checkcompression on all cylinders

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Posted on Jan 02, 2017

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1 Answer

I have a 1995 mustang cobra. just rebuilt engine 500 miles ago. it suddenly started overheating, iremoved the thermostat but it still overheats any suggestions?


retension the head studs
if you did not clean out the stud holes before fitting the head it is very possible that the oil/water gunk in the holes is locking the bolt and achieving tension setting without achieving the proper tension on the gasket so after a period of use the gasket fails
run a compression test first
another point is when rebuilding an engine it is always advisable to have the head skimmed to ensure that it is not warped
when tensioning down a head you must follow the tightening sequence so that the gasket is compressed evenly
if you covered all these points then look for ignition timing ( close to tdc or after tdc)or air fuel ratio problems as late timing or a lean mixture will overheat

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I recently changed the head gasket after overheating. The car is not starting and emitting heavy smoke


How hot did the car get before you had to change the head gasket? If the car had extreme heat then it could have damaged the rings. The rings will collapse and allow oil to squeeze past and burn out of the exhaust causing the smoke. Also since the rings are collapsed the vehicle will have no compression hence the no start. First thing is do a compression check.

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Hi,my avanza was mixing,I have cylinder head checked twice and put new gaskets twice.The problem now is boiling and the idling changes on its own.


replacing head gaskets is not always the answer on its own
the reason the head gasket failed in the first place has to be addressed first
have the head machined by a head /engine reconditioning shop to ensure that it is not warped or cracked
next clean out the stud holes with a thread tap and compressed air
next get the correct tension settings as most modern engines do not have a tension but an angle of turn on the stud head to achieve the correct tension
next get the proper rotation of tightening the studs so that the head settles evenly on the gasket
next pull the thermostat and have it tested for correct operation and ensure that it is installed with the body of the unit facing the head or block
check that the fan/s are working and if there is a viscous fan hub involved have it replaced.

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


CHECK BELOW..
25458898-ms2db0pp00uj21y1nio4xcxs-1-0.png

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.
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- 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.

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1 Answer

E2000 van oil comeing out of cyls.3 and 4 very black and sticky.just fitted overhauld head.what could cause this .


there is a head gasket problem probably from the head bolts not holding the head down tight. When working on a head always make sure that tye head stud holes ore clean by using a thread tap and blowing the holes out with compressed air. Oil, water and gunk will stop the head stud from screwing all the way in yet you will still achieve the tension setting because the stud has bottomed out--hence the head gasket is not under correct pressure and the head studs are not under the correct tension.

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1 Answer

I have a 2004 f350 diesel. blows white smoke wail going down the road. so got back home and parked it. so now it starts and runs for a few then dies.Every time start white smoke come out and the engine run...


The cylinder head gasket has most likely failed, or the block or head have cracked or corroded to allow coolant into the combustion chambers. Commonly the fault is caused by such things as failing to use the correct coolant mix (using water only causes corrosion), or overheating due to coolant leak, or a failed water pump.

It's a major repair, and the exact cause won't be known until the engine is stripped down.

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1 Answer

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why are u replacing t he cylinder head gasket did it over heat or what cos it might need to be skimmed aswell as fitting new gasket and its not a job for a diy its too complicated with valve timing and head tightening set up

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