swisstoe
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Ive always used BRASS nuts on Old A series and Kent, Pinto engines as they expand to create a better gasket seal...
Disco 2 Blowing exhaust manifold, again. Probably need new cylinder head; what am I looking at?
- Thread starter Naf623
- Start date
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The only issue with them is that they are just a tad softer, but at 20lbs/foot it isn't a problem, the other problem suggested is that a warping manifold might flick them off. So, a/ better than rooting the stud out which three of us at least on this thread have had happen. b/ if the nut is thick enough it has enough thread to grip properly, just don't try and use thin ones. You will also need some sort of lock washer.
Si Click
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Glad you finally got it sorted.
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Happy for you!
brianconwy
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Land rover don't recommend machining the head but I would think light skimming might be ok.
Si Click
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I'm assuming that you had the manifold skimmed. When did the head come off to allow it's exhaust port face to be skimmed?
Why are the garage saying this, has it started blowing again so soon?
Why are the garage saying this, has it started blowing again so soon?
Yeah, the manifold was skimmed. I've had the head off so that a broken stud could be removed and the hole fixed up again with a larger stud. While putting it back together again I got a call from the garage telling me that it's good practise to have the head skimmed whenever you take it off, just to be safe; and that if I have any head gasket issues then not having that done will be the cause.
I'm a bit miffed that they are saying this now, and not while I had the head off and with the guy who could have done it; but I also would have thought that the guy who fixed it up (he specialises in remanufacturing heads) would have suggested it if it really was that big of a deal.
Si Click
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Given that the head was not removed due to a head gasket failure or overheating, I doubt that there will be an issue. Who put the head back on? If it was the garage then they certainly should have raised their concern before they did the work.
This turns out to be the gift that keeps on giving.
After refitting the garage started turning her over by hand to make sure everything was OK, and have discovered that one of the valves was catching the piston head. So head is off again and back with someone to try and find out why and fettle that.
Not a great Christmas present to have to drive 400 miles visiting family in a 2001 Astra where the demisters don't work so we had to keep front windows open a crack to be able to see out...
After refitting the garage started turning her over by hand to make sure everything was OK, and have discovered that one of the valves was catching the piston head. So head is off again and back with someone to try and find out why and fettle that.
Not a great Christmas present to have to drive 400 miles visiting family in a 2001 Astra where the demisters don't work so we had to keep front windows open a crack to be able to see out...
jamesmartin
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a thicker gasket or cutting the valve seats to match amount skimmed off head face, all these experts that know about head skimming but not enough to check valve stand down or fully understand the subject
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Would they not have to grind the same amount off the top of the valve stem as well? I know a bloke who races Landies and he pockets the tops of the pistons, he must go carefull to not weaken them!
jamesmartin
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if it was out of spec of the lash adjuster
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yet again thinking of automatic oil filled self adjusting cam followers, the intricacies of which I do not know, I only know how to do old fashioned tappets and manually adjusted cam followers. Can't remember offhand which they are on the TD5.
jamesmartin
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td5 uses a hydraulic tappet now called lash adjusters
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Whatever happens, he'll have to take the lid off. Whoops! some of the cost of this should be down to the head skimmers. Wonder how much they skimmed off it? Agree they really should know better! Reminds me of the nightmare of the Dolomite Sprint head.
Si Click
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Now that has brought back some memories. Mt dad had two as company cars in the 70s and when new they were brilliant; great handling and performance (for the time). I bought a secondhand one in 1985 and it was definitely tired. I never overheated it or blew a head gasket, but the electrics were shocking,at one point going to dipped beam turned off the lights completely.
