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1. [Roadsters] Cylinder head (score: 1): Author: dansummers@comcast.net; Date: Tue, 04 Mar 2008 04:38:03 +0000; I plan to pull the cylinder head on a u20. The previous owner of my car told me today that he had the head welded many years ago and that if I could get this one at a reasonable price I should get it; /html/datsun-roadsters/2008-03/msg00056.html (6,841 bytes)
2. Re: [Roadsters] Cylinder head (score: 1): Author: "dave" <daveandlindab@comcast.net>; Date: Tue, 4 Mar 2008 19:57:02 -0500; It's not too complex, Cam cover off, usually both manifolds off or at least disconnect the header and remove it from the head and exhaust pipe. Cam gear unbolts from the cam, and you can use the the; /html/datsun-roadsters/2008-03/msg00059.html (8,071 bytes)
3. Re: [Roadsters] Cylinder head (score: 1): Author: "Bubba" <bubwin@mts.net>; Date: Tue, 4 Mar 2008 23:30:34 -0600; When loosening the head bolts, start at the front and crack the first two head bolts loose, about 1/4 turn, then the back two by the firewall, then the second row from the front, then the second last; /html/datsun-roadsters/2008-03/msg00060.html (10,337 bytes)
4. Re: [Roadsters] Cylinder head (score: 1): Author: peter harrison <granvillecomputing@hotmail.com>; Date: Tue, 4 Mar 2008 22:27:57 -0800; I don't know if this applies in this case, but I have often heard, and indeed believe, that with old nuts/bolts it is often better to tighten them up a flat or so and then begin to loosen FWIW ______; /html/datsun-roadsters/2008-03/msg00061.html (7,072 bytes)
5. Re: [Roadsters] Cylinder head (score: 1): Author: "dave" <daveandlindab@comcast.net>; Date: Wed, 5 Mar 2008 20:36:52 -0500; I never heard that before, I didn't think a cold head woul warp from the torque being let off unevenly, but I guess it's possible. Not refuting it, just news to me. Dave Brisco When loosening the hea; /html/datsun-roadsters/2008-03/msg00068.html (8,323 bytes)
6. Re: [Roadsters] Cylinder head (score: 1): Author: Gary McCormick <gkmcc@sbcglobal.net>; Date: Wed, 05 Mar 2008 18:50:43 -0800; If there is a specified torque pattern for tightening, standard practice is to reverse it to loosen. That's a critical joint - why take chances? Gary McCormick '70 2000 SRL311-13291 San Jose, CA ____; /html/datsun-roadsters/2008-03/msg00069.html (8,695 bytes)
7. Re: [Roadsters] Cylinder head (score: 1): Author: "gregs672liter@netzero.net" <gregs672liter@netzero.net>; Date: Thu, 6 Mar 2008 03:17:29 GMT; Yep, my friend Steve (head guru) has shown me a number of "banana heads" (i.e. warped) from improper removal. Just because it is cold does not mean it is not under stress. Good info to know! Greg Bur; /html/datsun-roadsters/2008-03/msg00070.html (9,220 bytes)
8. Re: [Roadsters] Cylinder head (score: 1): Author: "Dave Stoll" <dgstoll@verizon.net>; Date: Wed, 05 Mar 2008 22:23:23 -0500; There is a tolerance for how flat the head is. None are perfectly flat. If the head is curved so that the ends touch the top of the block first, by starting torquing the bolts in the middle first you; /html/datsun-roadsters/2008-03/msg00071.html (8,503 bytes)
9. Re: [Roadsters] Cylinder head (score: 1): Author: Jim Gammon <gtpjimgammon@yahoo.com>; Date: Thu, 6 Mar 2008 04:50:09 -0800 (PST); Years ago I had a head warp on my first roadster, and like an idiot, I had it A few weeks later the cam broke in half. You can't make this stuff up. Jim Dave Stoll <dgstoll@verizon.net> wrote: There; /html/datsun-roadsters/2008-03/msg00077.html (9,245 bytes)
10. Re: [Roadsters] Cylinder head (score: 1): Author: Keith0alan@aol.com; Date: Thu, 6 Mar 2008 09:24:23 EST; Years ago I had a head warp on my first roadster, and like an idiot, I had it shaved. A few weeks later the cam broke in half. You can't make this stuff up. Jim When you have an overhead cam head sha; /html/datsun-roadsters/2008-03/msg00078.html (8,309 bytes)
11. Re: [Roadsters] Cylinder head (score: 1): Author: Jim Gammon <gtpjimgammon@yahoo.com>; Date: Thu, 6 Mar 2008 08:58:51 -0800 (PST); A good lesson for all you out there not to repeat my mistake. Of course on that car, I was fortunate to not damage a piston and found a good head with a B cam, which I loved.... More unfortumately, I; /html/datsun-roadsters/2008-03/msg00079.html (9,125 bytes)
12. Re: [Roadsters] Cylinder head (score: 1): Author: "gregs672liter@netzero.net" <gregs672liter@netzero.net>; Date: Thu, 6 Mar 2008 17:26:49 GMT; Heads can be straighted by heating without shaving them if the shop is set up to do that. Greg A few weeks later the cam broke in half. You can't make this stuff up. Jim Dave Stoll <dgstoll@verizon.n; /html/datsun-roadsters/2008-03/msg00080.html (10,339 bytes)
13. Re: [Roadsters] Cylinder head (score: 1): Author: ljordan704@netscape.net; Date: Thu, 06 Mar 2008 13:21:40 -0500; How many shops are likely to be able to do that? And if it can be done it seems that with a scarity of cylinder heads this process may happen more and more. I always here that cylinder heads can be; /html/datsun-roadsters/2008-03/msg00081.html (8,429 bytes)
14. Re: [Roadsters] Cylinder head (score: 1): Author: Gary and Cindy Ault <aultgc@att.net>; Date: Thu, 6 Mar 2008 18:53:32 -0800 (PST); My recollection is that the standard for the U20 head is 0.0019 inches. Jim's experience is why Nissan ran out of U20 heads very early. We're very fortunate that they spent the money to have new tool; /html/datsun-roadsters/2008-03/msg00087.html (10,204 bytes)
15. Re: [Roadsters] Cylinder head (score: 1): Author: "Gary and Cindy Ault" <aultgc@att.net>; Date: Sat, 8 Mar 2008 20:32:43 -0600; I'm sure there are people out there smarter than me, but my opinion is as It makes no difference how one loosens the head bolts. I am sure that many heads have proven to be warped after the heads bol; /html/datsun-roadsters/2008-03/msg00102.html (10,414 bytes)
16. Re: [Roadsters] Cylinder head (score: 1): Author: Keith0alan@aol.com; Date: Sat, 8 Mar 2008 23:12:09 EST; I'm sure there are people out there smarter than me, but my opinion is as follows: It makes no difference how one loosens the head bolts. I am sure that many heads have proven to be warped after the; /html/datsun-roadsters/2008-03/msg00103.html (8,986 bytes)
17. Re: [Roadsters] Cylinder head (score: 1): Author: "Bubba" <bubwin@mts.net>; Date: Mon, 10 Mar 2008 00:56:21 -0500; I don't know, but I have about 150 shop manuals from my many years as a fully licensed mechanic, and the engineers that designed the engines and wrote those manuals seem to mention with some regulari; /html/datsun-roadsters/2008-03/msg00106.html (10,219 bytes)
18. Re: [Roadsters] Cylinder head (score: 1): Author: Keith0alan@aol.com; Date: Mon, 10 Mar 2008 09:32:18 EDT; I'll not bother to share my wasted years of knowledge again. I'm sure others know better. Happy fixing. Good Luck. Please continue sharing your knowledge. A lot of us appreciate it. This is an unmode; /html/datsun-roadsters/2008-03/msg00107.html (8,703 bytes)
19. Re: [Roadsters] Cylinder head (score: 1): Author: Pat Horne <roadsters@hornesystemstx.com>; Date: Mon, 10 Mar 2008 12:51:00 -0500; Keith's right. Some times you get flamed when you deserve it, some times you get flamed when you don't! I sent email to a user on a different list the other day telling him how much better a differen; /html/datsun-roadsters/2008-03/msg00114.html (10,644 bytes)
20. Re: [Roadsters] Cylinder head (score: 1): Author: ljordan704@netscape.net; Date: Mon, 10 Mar 2008 15:16:48 -0400; Putting out the fire right away is important to keeping a List in control. On a non-moderated List that would come down to peer pressure or the List owner ultimately. This List seems to take care of; /html/datsun-roadsters/2008-03/msg00115.html (8,147 bytes)

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