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Old 12-22-2011, 02:40 AM
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head gasket failure

Hello everyone .

Im curious to know if on an engine like a rover where the two middle cylinders on both banks have no water or oil galleys passing through the head gasket around the bores would it be possible to have good compressions 150 on all cylinders cold but head gasket failure on combustion at peak cylinder pressure allowing the burnt gasses to get into the adjoining cylinder . These motors have a tin head gasket . Or would any sort of compromised gasket show up in the compression test on the affected cylinders .

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Old 12-22-2011, 05:51 AM
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Quote:
Originally Posted by theg
Hello everyone .

Im curious to know if on an engine like a rover where the two middle cylinders on both banks have no water or oil galleys passing through the head gasket around the bores would it be possible to have good compressions 150 on all cylinders cold but head gasket failure on combustion at peak cylinder pressure allowing the burnt gasses to get into the adjoining cylinder . These motors have a tin head gasket . Or would any sort of compromised gasket show up in the compression test on the affected cylinders .
Usually a failed head gasket will show up on a compression test or a leak down test.

What is your symptom
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Old 12-22-2011, 08:26 AM
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retorque ?

I used to have to retorque the head bolts on My Jag XKE every couple of months. THe car was a pain, Wipers wouldn't work in the rain, but would just start by themselvs on a hot day (3 on the windshield). typical electrical Jag. problems
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Old 12-23-2011, 02:52 AM
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What is your symptom[/QUOTE]

I have a misfire when cold start up for about 5miles driving then the misfire disappears . I wonder if its head gasket leaking compression then taking up when hot .
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Old 12-23-2011, 03:06 AM
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Very possible, I had an Aluminum Headed Engine do the same, once it warmed up the Skip would disappear. Mine was also losing Coolant.
Turned out to be slightly warped Head & poor Gasket seal.
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Old 12-23-2011, 07:41 AM
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Quote:
Originally Posted by theg
What is your symptom
I have a misfire when cold start up for about 5miles driving then the misfire disappears . I wonder if its head gasket leaking compression then taking up when hot .[/QUOTE]That symptom could be a myriad of things. What have you done to diagnose it as a head gasket, or is that what you have narrowed it down to, or ?

What were the exact circumstances of this happening the first time? Was the engine overheated before this began? Or any work done that involved the heads, etc.?

Have the heads been retorqued? I'd begin w/a leakdown if the ignition and fuel delivery have been positively ruled out.
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Old 12-23-2011, 02:05 PM
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Quote:
Originally Posted by theg
I have a misfire when cold start up for about 5miles driving then the misfire disappears . I wonder if its head gasket leaking compression then taking up when hot .
Could be leaking coolant into the cylinder when it sits and is cold
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Old 12-23-2011, 02:25 PM
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The last and only car that I had with a head gasket leak caused the spark plug to turn green in the offending cylinder. I'd pull the plugs and compare the colors. That was how I found that I had a bad head gasket.
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Old 12-23-2011, 08:14 PM
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I had the same symtoms on a Chevy V8 once and it was valves going bad. Low compression when I took cold readings, but higher by 40 points when warmed up. Pulled the heads and did a valve job and all was fine after that.
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Old 12-24-2011, 02:37 AM
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Quote:
Originally Posted by cobalt327
I have a misfire when cold start up for about 5miles driving then the misfire disappears . I wonder if its head gasket leaking compression then taking up when hot .
That symptom could be a myriad of things. What have you done to diagnose it as a head gasket, or is that what you have narrowed it down to, or ?

What were the exact circumstances of this happening the first time? Was the engine overheated before this began? Or any work done that involved the heads, etc.?

Have the heads been retorqued? I'd begin w/a leakdown if the ignition and fuel delivery have been positively ruled out.[/QUOTE]


I drove the car on a 50 mile trip all good no problems . Jumped in after parking for an hour and started it then the misfire was there . drove 5 mins and all good again until next start . Does it every time now . I havnt narrowed it down to a cause but the cylinder i have identified by pulling the lead with engine running . Done compressions since , all good . The cylinder in question has no water or oil jacket passing through the head gasket beside it so water in the cylinder wont be a clue . Im only doubting ignition as the cause because one it comes good it goes really well under load and cruise .
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Old 12-24-2011, 03:02 AM
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Quote:
Originally Posted by theg
I drove the car on a 50 mile trip all good no problems . Jumped in after parking for an hour and started it then the misfire was there . drove 5 mins and all good again until next start . Does it every time now . I havnt narrowed it down to a cause but the cylinder i have identified by pulling the lead with engine running . Done compressions since , all good . The cylinder in question has no water or oil jacket passing through the head gasket beside it so water in the cylinder wont be a clue . Im only doubting ignition as the cause because one it comes good it goes really well under load and cruise .
Just for S&G I'd go ahead and replace that cylinder's spark plug. You know, easy things first... Maybe swap that plug wire out for another good wire- that sort of thing just to eliminate anything obvious before getting into the engine itself.
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