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1. [Healeys] playing detective (score: 1): Author: "James Shope" <healeymanjim@hansencc.net>; Date: Thu, 27 Sep 2007 20:15:19 -0700; my friends bj8 started running rough a while back. we were going to do a tuneup but a compression check showed only 60 psi in #6. machine shop found a crack and pinned it, plus all new valves, harden; /html/healeys/2007-09/msg00672.html (8,142 bytes)
2. Re: [Healeys] playing detective (score: 1): Author: "Rich C" <richchrysler@quickclic.net>; Date: Thu, 27 Sep 2007 23:20:15 -0400; Are you sure you don't have a rocker clearance set a little too tight? Rich Chrysler _______________________________________________ Healeys@autox.team.net http://autox.team.net/mailman/listinfo/heal; /html/healeys/2007-09/msg00673.html (9,117 bytes)
3. Re: [Healeys] playing detective (score: 1): Author: "Greg Lemon" <glemon@neb.rr.com>; Date: Thu, 27 Sep 2007 23:44:48 -0500; OK, I'll bite, cracked piston ring on installation?? can you test by holding something flat and slightly larger than the cylinder against the top of the block while turning the motor on the starter,; /html/healeys/2007-09/msg00674.html (8,014 bytes)
4. Re: [Healeys] playing detective (score: 1): Author: PG <bj8mk3@shaw.ca>; Date: Thu, 27 Sep 2007 22:37:05 -0700; The quickest way to tell your problem is by doing a leak down test. There are specialized tools for this purpose but, you can do it without. Using a pressurized air hose with an adaptor to fit in the; /html/healeys/2007-09/msg00675.html (9,234 bytes)
5. Re: [Healeys] playing detective (score: 1): Author: "Alan Seigrist" <healey.nut@gmail.com>; Date: Fri, 28 Sep 2007 14:07:36 +0800; Before cracked ring I'd guess scored cylinder... Alan _______________________________________________ Healeys@autox.team.net http://autox.team.net/mailman/listinfo/healeys; /html/healeys/2007-09/msg00676.html (8,379 bytes)
6. Re: [Healeys] playing detective (score: 1): Author: "Richard Ewald" <richard.ewald@gmail.com>; Date: Thu, 27 Sep 2007 23:35:31 -0700; If you put 150 PSI into a cylinder you will wind up pushing the piston to bottom dead center. Pushing the piston to BTC will open one valve, depending on which way the engine rotates. ask me how I kn; /html/healeys/2007-09/msg00677.html (8,848 bytes)
7. Re: [Healeys] playing detective (score: 1): Author: Bob Haskell <rchaskell@earthlink.net>; Date: Fri, 28 Sep 2007 06:30:59 -0400; My leak down tester only uses 100psi. It can rotate my MGB engine (haven't used it on the Healey six), usually happens when the piston is not quite at TDC. I use a wrench on the crankshaft nut to kee; /html/healeys/2007-09/msg00678.html (8,398 bytes)
8. Re: [Healeys] playing detective (score: 1): Author: Alan Schultz <alan@andysnet.net>; Date: Fri, 28 Sep 2007 07:59:27 -0500; New guides! New valves! Hmmm. Not enough clearance. Valve stuck open? _______________________________________________ Healeys@autox.team.net http://autox.team.net/mailman/listinfo/healeys; /html/healeys/2007-09/msg00679.html (7,294 bytes)
9. Re: [Healeys] playing detective (score: 1): Author: "Bob Yule" <autofarm@cyg.net>; Date: Fri, 28 Sep 2007 10:20:33 -0400; I would suspect the guides. Getting hot and expanding and holding onto the valves. Are the new guides bronze? There have been problems with these. Cheers.......Bob Check out our web site www.autofarm; /html/healeys/2007-09/msg00680.html (9,168 bytes)
10. Re: [Healeys] playing detective (score: 1): Author: "Michael Salter" <msalter@precisionsportscar.com>; Date: Fri, 28 Sep 2007 10:45:55 -0400; Hi James, As you have probably concluded "something just does not add up here". If the piston seal, valve seal and gasket are all good there is no where else for the compression to leak. I would have; /html/healeys/2007-09/msg00681.html (10,067 bytes)
11. Re: [Healeys] playing detective (score: 1): Author: Warthodson@aol.com; Date: Sat, 29 Sep 2007 10:11:17 EDT; I too have done dozens of leak down tests & do not find it difficult to locate top dead center on each cylinder. In fact is easy. Leak down testers do not require 150 PSI or any other specific pressu; /html/healeys/2007-09/msg00691.html (8,526 bytes)
12. [Healeys] playing detective (score: 1): Author: "James Shope" <healeymanjim@hansencc.net>; Date: Sat, 29 Sep 2007 19:25:23 -0700; with all the responses suspecting the valve train, i have began to wonder. with nothing obvious could it be possible that with new valves and guides, the valve is hanging up and not closing fast enou; /html/healeys/2007-09/msg00696.html (8,509 bytes)
13. Re: [Healeys] playing detective (score: 1): Author: "Greg Lemon" <glemon@neb.rr.com>; Date: Sun, 30 Sep 2007 00:13:19 -0500; If the valve were returning slowly wouldn't you get worse running pressure?, I believe you recorded zero compression on a compression test and 60 PSI with the car running. Have you tried the old oil; /html/healeys/2007-09/msg00699.html (9,612 bytes)
14. Re: [Healeys] playing detective (score: 1): Author: PG <britishcars@shaw.ca>; Date: Sat, 29 Sep 2007 22:58:45 -0700; If you did have "valve float", it would be at higher rpm and it sounds like your issue is through the rpm range. Stock springs have about 90 lbs of pressure in the valve closed position. This should; /html/healeys/2007-09/msg00700.html (9,417 bytes)
15. Re: [Healeys] playing detective (score: 1): Author: "Alan" <alanb@nfahc.co.uk>; Date: Sun, 30 Sep 2007 08:53:15 +0100; Hey James. A leak down test doesn't have to be fancy. Break open a spark plug and weld, braze or even epoxy a piece of tube into the metal body. Put a hose and clip on the tube to connect the plug to; /html/healeys/2007-09/msg00701.html (8,496 bytes)

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