Head Gasket - Page 2 - LotusTalk - The Lotus Cars Community
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post #21 of 103 (permalink) Old 03-20-2018, 08:13 AM
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I had to use the long reach Harbor Freight 2 ton crane, just to reach that far into the engine bay.

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post #22 of 103 (permalink) Old 03-20-2018, 03:38 PM Thread Starter
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All's well that ends well. I extracted the lump this afternoon using the traditional engine/tranny coming out as one. The trans and engine are now separated and the engine is bolted to an engine stand. After some cleaning up I will start the disassembly tomorrow.
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post #23 of 103 (permalink) Old 03-21-2018, 12:55 AM
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Looking good there - very familiar with that look (hanging from the HF 2 ton crane....), have had the engine in and out of my Esprit probably 7 or 8 times now....

Head gaskets do wear out....particularly in a iron block/alloy head engine...without necessarily any overheating or warping of the head. The differing thermal expansion rates of iron and (typical) alloy use for heads combined with the expected "walking" of the relative positions will wear a gasket over enough time. The more heat cycles and age, the more likely it is the gasket will wear and then eventually fail. A turbo Esprit engine is probably going to be harder on head gaskets than a lot of other engines. What you're having to fix there is as much "maintenance" as anything else.

That said, as Dave mentioned, overheating will usually cause the head to warp and then the gasket will quickly fail. The net of it is you should have the head run through a surface grinder regardless, to ensure it's completely flat...endeavoring to remove as little metal as possible to get it to that state. A good machine shop will progressively grind and check for flatness.....a poor shop will just go ahead and take a big cut.

Take it slowly and carefully, measure everything that has a spec and write it down, and keep the parts well organized and clean and you should be fine.
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post #24 of 103 (permalink) Old 03-21-2018, 07:04 PM Thread Starter
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Got the upper engine disassembly done today. Here is a picture of the gasket. It is not the Goetze, but the JAE version. The picture shows the failure spots by #1 and#2 cylinder, but only #2 had coolant reach the piston. The #1 piston is at the bottom of the picture. You can see the breech on the right slightly above 3 o'clock on #2. #1 was pretty deteriorated but hadn't quite failed. It didn't have much of a future however. Elsewhere the gasket looked ok. The picture is of the underside (block deck side) of the gasket. The upper side showed no deterioration. Everything else on the upper engine looked visually ok. I'll get the head out to my head guy on Friday and see what he has to say. Liners look good, nip looks ok but I will recheck it again on Friday. I'll keep you posted on what we find out.
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post #25 of 103 (permalink) Old 03-22-2018, 09:09 AM
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Pulled mine out last night. #4 intake side gone, with #3 going next due to overheating. Don't remember if this is a JAE or a Kemp gasket, I'll compare it to the one JAE sends.

Spent half the time trying to get to the farthest turbo stud, finally welded a socket to an offset wrench to get the nut. A Stevens Alunox in a G-car does not have enough room using the engine tilt method to pull the manifold out with the head , but at least the studs are easy to get to.

My entry for the ugliest Lotus tool ever, a cam cover lifter. The covers don't leak, but they don't want to come off either!
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post #26 of 103 (permalink) Old 03-22-2018, 07:35 PM
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If a self designed tool works for the intended job it is a thing of BEAUTY!
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post #27 of 103 (permalink) Old 03-22-2018, 08:14 PM
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DaveC sent this link to me:
What?s what? The facts of Gasket Materials ? SCE Gaskets

The site gives information on different types of gaskets. This page opens with a description of 'composite' gaskets. Nothing specific about the Goetze or JAE gaskets, just information in general.

Regards,
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post #28 of 103 (permalink) Old 03-28-2018, 10:24 AM
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I've never measured any type of 9XX head gasket before or after use, so I don't have anything for you to compare against. But perhaps it would be good to start taking measurements. Besides the obvious loose-part dimensions, also consider measuring it's thickness before and after torquing the head. 'Somehow' (?) measure the gap between head and block with the gasket installed, but the nuts only finger tight, then again after torquing them down. What are the natural and compressed thicknesses? If we had that info for both the Goetze and JAE gaskets, we might be able to... ahhh... figure out what to do with it.

Tim
Here's some measurements of what I have on hand, doubtless there's some expansion when released from the clamp load, and your nip may vary, but a rough idea.
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File Type: xls HeadGaskets.xls (155.5 KB, 121 views)
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post #29 of 103 (permalink) Old 03-31-2018, 10:23 PM
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Nothing more beautiful than a rebuilt, cleaned, shiny, Lotus designed engine with a new head gasket. My head gasket needed to be replaced as it was leaking. With the V8 gaskets, there was a batch (JAE I think) that were slightly too small, and causing many problems with V8 owners. But now, I believe that SJ Sportscars have new OEM ones that were made to spec. The 910 in my old SE was great, but driving and hearing a good 918 with an F1 designed flat plane crank is awesome. Instead of a standard “V8 rumble” of an American engine, the 918 has a straight line rev feel, and the flat plane sound is totally different. It feels and sounds so good. Good luck with the build and I hope you get another great 40,000 miles. Cheers
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post #30 of 103 (permalink) Old 04-02-2018, 08:36 AM
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I just received the Goetze head gasket from JAE

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post #31 of 103 (permalink) Old 04-02-2018, 02:08 PM Thread Starter
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Travis,

The photo you attached is not showing up on my iPad.

Well, getting close to putting in my order to JAE. Checked my liner nip today and everything looks very good.
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post #32 of 103 (permalink) Old 04-03-2018, 06:25 AM
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Travis's photo doesn't show up for me on PC either. However, he sent me a picture of his engine with the Goetze gasket yesterday.
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post #33 of 103 (permalink) Old 04-03-2018, 02:41 PM Thread Starter
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Progress report: Everything apart and clean on the engine, waiting for my machinist to let me know about the condition of the head. As part of the project I am replacing the oil cooler and the oil cooler hoses. Got everything loosened up and have the hoses dangling. Well, there not going anywhere at this point. Trapped inside the chassis spine. I ran my boroscope in there to see if I could identify the obstacles, not of much help. I can tell you that there are a hell of a lot of zip ties binding the two hoses together. . Tomorrow I will pull out the shifter so I can access the spine and free up the hoses so I can extract them.

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post #34 of 103 (permalink) Old 04-04-2018, 08:43 AM Thread Starter
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Removed the oil hoses this morning.... Damn, they're long!

Quite the project 😅
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post #35 of 103 (permalink) Old 04-04-2018, 02:51 PM
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are you taking them to Goodyear near you to have them made?
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post #36 of 103 (permalink) Old 04-04-2018, 02:59 PM Thread Starter
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Taking them down to BAT in Sarasota. They have all the odd British stuff, like 5/8" BSP....

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post #37 of 103 (permalink) Old 04-04-2018, 05:58 PM
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Quote:
Originally Posted by mieczkow View Post
Removed the oil hoses this morning.... Damn, they're long!

😅
Yep, when you change the oil on an Esprit, there's plenty left in the front loop.

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post #38 of 103 (permalink) Old 04-04-2018, 06:20 PM
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those aren't AN/JIC?
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post #39 of 103 (permalink) Old 04-04-2018, 08:01 PM Thread Starter
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There 5/8" BSP. I will need to keep the oil cooler ends as they are, but I am switching everything on the back end to 10 AN. I have found sources for everything so I am going to fab the new hoses myself.

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post #40 of 103 (permalink) Old 04-15-2018, 03:42 PM
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Finally started the car after a frustrating head gasket R&R.
Putting on the exhaust (of course!) cam carrier and managed, @ a mere 90 inch pounds of torque, to come up with an extra part, the dreaded A910E00666, separable M8 x 1.25 thread.
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