Leaky cylinder liners - LotusTalk - The Lotus Cars Community
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post #1 of 7 (permalink) Old 09-10-2009, 04:14 PM Thread Starter
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Leaky cylinder liners

I've done a search on the forum but couldn't find an answer to this question ---- sorry if this is a re-post...............

I've heard mentioned that the early V8's had a problem with leaking cylinder liners, but this was later remedied by the factory at some point in production. Does anyone know the MY and VIN (serial) that marks the start of when the "bad sealant" issue was resolved in production?
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post #2 of 7 (permalink) Old 09-10-2009, 05:16 PM
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They changed to the new sealant mid-2000. Never heard of an 00+ car with liner sealant issues. The earlier cars are hit and miss, though the vast majority are usually fine.

The condition of the oil is a dead giveaway of liner leaks. Check the oil regularly for any water (white froth, opaque oil, foam under the fill cap). You can also pressure test the cooling system, though that's generally somewhat inconclusive if there are other issues present.
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post #3 of 7 (permalink) Old 09-10-2009, 09:23 PM Thread Starter
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In your experience, does this problem tend to show up right out of the gate, or does the engine have to rack up some mileage before the leaking develops (on the cars which actually end up with the defect, of course)?
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post #4 of 7 (permalink) Old 09-10-2009, 11:06 PM
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I'm willing to bet any ring seal issues are due to an improper break in.

Newsflash: An 'easy' break in is not the correct way to achieve good ring seal.

Source: Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power
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post #5 of 7 (permalink) Old 09-11-2009, 03:32 AM
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Leaking liners usually happens when the car gets overheated. That's why some early V8 owners put in the larger and better Aluminum Radiator as a level of insurance. However, words are those cars that are not leaking by now, should not leak at all.

Lotus switched to the new sealant (Hylomar) in June, 2000.

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post #6 of 7 (permalink) Old 09-11-2009, 01:12 PM
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If the car hasn't experienced the issue by now, I wouldn't worry about it. As someone else mentioned cheap insurance on the early cars is to install a better radiator with upgraded fans.
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post #7 of 7 (permalink) Old 09-29-2009, 05:42 PM
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Cylinder Liner Sealants

Lotus went from Hylomar PL-32 (Universal Blue) in the 4-cylinder 9XX engines, to Loctite 572, to Hylomar 3400 (an anerobic, not the blue goo). So while they did go back to Hylomar the brand, they didn't go back to the original Hylomar sealant.

The problem with 572 was Lotus' engine assembly vendor's failure to follow the sealant's procedure, and not a failure of the sealant itself. If you have an early V8 that doesn't leak by now, then there's no particular reason to fear the 572. It's a good sealant, but perhaps the long cure time makes it a less than ideal choice for series production.

Hylomar 3400 has a cure time, but it's much shorter than 572's.

Hylomar PL-32 is ready to go right away... no cure time required since it never really cures.

Tim Engel
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