Response from Hylomar
Discussion
[quote=hylomar]
Dear sir or madam
We are concerned to read the comments regarding Hylomar 3400 used to seal cylinder liners on Lotus Esprit V8 engines on the Forum section of your website.
Hylomar Limited are the manufacturers of Hylomar 3400 anaerobic gasket compound and no one (including Paula & Marcus) has bothered to contact us to ask whether Hylomar 3400 is resistant to glycol. We also have to question how any other manufacturer of sealants could, without bias, make any comment on the performance of our products.
For the information of all of your members Hylomar Gasket 3400 has been used to seal the cylinder liners on Lotus Esprit V8 engines since early 2000 and this is the first adverse comment that either Lotus or ourselves are aware of.
As one would expect extensive testing was done by Lotus before changing from Loctite 572 to Hylomar 3400 and the results showed that the Hylomar product gave significantly improved sealing. Hylomar have also done testing of Hylomar 3400 against anti-freeze and whilst there is some reduction in adhesion after 1000 hours immersion in antifreeze at 90oC the product does not “disappear” as stated by Paula & Marcus.
We should perhaps take the time to explain how the product works as this may give some indication of why Paula & Marcus think the product has disappeared. Hylomar 3400 is an anaerobic gasket compound that fills in any imperfections on the matting surfaces of a metal to metal joint and allows metal to metal contact. No machined surface is perfect, they all have machining marks and Hylomar 3400 simply fills these marks. Therefore the amount of product actually in the joint is very small and it is quite possible that anyone quickly looking at a separated joint might think that there was no sealant there at all.
By their very nature anaerobic gasket materials just like thread lockers will only cure between 2 metal surfaces in the absence of oxygen. Please see the Hylomar Technical Bulletin “Guidelines for using anaerobic gasketing products” for further information.
We also have to ask whether any work has been done on the cylinder liners in the particular V8 engine in question since it was originally built and if so whether the correct product was used to seal the liners when the engine was put back together? If the engine has been rebuilt and the correct product used was the product allowed to cure before the coolant system was refilled?
A more likely culprit for causing corrosion and abrasion of the metal parts is not the Glycol but the water used. High alkali chalky water can cause galvanic corrosion and the chalk can act like grinding paste, hence the radiator core change mentioned also.
Unless large quantities of water were found in the crank case below the liner seal, this comment should be taken as a “Red Herring” and other possible causes of the water loss and overheating investigated.
In the meantime if anyone wants information about Hylomar’s excellent range of high performance products please go to our website (www.hylomar.com). We are a very helpful and friendly bunch so if you have specific questions please e-mail us at info@hylomar.co.uk or come and visit us at the SCCA June Sprints 24, 25 & 26 June Road America
Bill Griffiths
Director of Sales & Marketing
Warrick Dawson
Marketing & Distributor Manager
[/quote]
Dear sir or madam
We are concerned to read the comments regarding Hylomar 3400 used to seal cylinder liners on Lotus Esprit V8 engines on the Forum section of your website.
Hylomar Limited are the manufacturers of Hylomar 3400 anaerobic gasket compound and no one (including Paula & Marcus) has bothered to contact us to ask whether Hylomar 3400 is resistant to glycol. We also have to question how any other manufacturer of sealants could, without bias, make any comment on the performance of our products.
For the information of all of your members Hylomar Gasket 3400 has been used to seal the cylinder liners on Lotus Esprit V8 engines since early 2000 and this is the first adverse comment that either Lotus or ourselves are aware of.
As one would expect extensive testing was done by Lotus before changing from Loctite 572 to Hylomar 3400 and the results showed that the Hylomar product gave significantly improved sealing. Hylomar have also done testing of Hylomar 3400 against anti-freeze and whilst there is some reduction in adhesion after 1000 hours immersion in antifreeze at 90oC the product does not “disappear” as stated by Paula & Marcus.
We should perhaps take the time to explain how the product works as this may give some indication of why Paula & Marcus think the product has disappeared. Hylomar 3400 is an anaerobic gasket compound that fills in any imperfections on the matting surfaces of a metal to metal joint and allows metal to metal contact. No machined surface is perfect, they all have machining marks and Hylomar 3400 simply fills these marks. Therefore the amount of product actually in the joint is very small and it is quite possible that anyone quickly looking at a separated joint might think that there was no sealant there at all.
By their very nature anaerobic gasket materials just like thread lockers will only cure between 2 metal surfaces in the absence of oxygen. Please see the Hylomar Technical Bulletin “Guidelines for using anaerobic gasketing products” for further information.
We also have to ask whether any work has been done on the cylinder liners in the particular V8 engine in question since it was originally built and if so whether the correct product was used to seal the liners when the engine was put back together? If the engine has been rebuilt and the correct product used was the product allowed to cure before the coolant system was refilled?
A more likely culprit for causing corrosion and abrasion of the metal parts is not the Glycol but the water used. High alkali chalky water can cause galvanic corrosion and the chalk can act like grinding paste, hence the radiator core change mentioned also.
Unless large quantities of water were found in the crank case below the liner seal, this comment should be taken as a “Red Herring” and other possible causes of the water loss and overheating investigated.
In the meantime if anyone wants information about Hylomar’s excellent range of high performance products please go to our website (www.hylomar.com). We are a very helpful and friendly bunch so if you have specific questions please e-mail us at info@hylomar.co.uk or come and visit us at the SCCA June Sprints 24, 25 & 26 June Road America
Bill Griffiths
Director of Sales & Marketing
Warrick Dawson
Marketing & Distributor Manager
[/quote]
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