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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5938
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Sikaflex 291 as a gasket sealant
Is Sikaflex 291 any good as a gasket sealant coupled with a proper gasket?
The reason for asking is I have replaced my rocker gasket on the TD5 at least twice maybe three times with Gen LR one and after-market ones. I have tried just gasket and tried with Hermitite red and blue. The leaks return after a few months, Namely the half moon at the rear of the rocker and above the intake manifold.

The other Censored is the front plastic disc on the front of the engine. Again, Gen LR and after market ones. With and without gasket sealant.

The only difference on my 99' Td5 is I have an AMC head.

So having used red and blue sealant I am thinking of trying Sikaflex 291 as I have some,
if its no good, what sealant is good?
Oh and also tried the sealant used by LR to seal the sumps on Pumas.

I have checked the rocker breather and that's clear and done the bolts up to specified torque.
Or is a LR thing and they all leak? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #213039 21st Feb 2013 9:15pm
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GUM97



Member Since: 05 Feb 2012
Location: Cheshire
Posts: 3555
United Kingdom 1997 Defender 90 300 Tdi HT Stornoway Grey
I'll give a Thumbs Up to Sikaflex for most leaks! It's worked a treat to seal my sump, and a few other things Very Happy An engine to TDi for!
"Land Rover- Proudly turning drivers into mechanics since 1948"
Post #213040 21st Feb 2013 9:18pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5938
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Cheers. Its getting annoying! 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #213043 21st Feb 2013 9:20pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610
United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
Whilst Sikaflex 291i is brilliant stuff it can only be used in temperatures of -40 to +90 on the rocker cover I would use Holdtite RTV853. Better than Sikaflex in a hot oily environment and used prolifically in the marine engineering world.

http://www.multibondsolutions.co.uk/index....gory_id=10 If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #213281 22nd Feb 2013 5:37pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5938
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Cheers K9F. If its good for Marine environment and upto 270 deg'c then it could be worth a dabble.
Maybe that's were I am going wrong and the Hermattie blue/red is breaking down with the heat? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #213301 22nd Feb 2013 6:21pm
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couplands



Member Since: 31 Aug 2011
Location: Peak District & Cornwall
Posts: 1826
United Kingdom 2001 Defender 90 Td5 HT Oslo Blue
Have you checked if the head is warped or twisted. If it keeps blowing gaskets it sounds like something isn't right..?

Cheers

Simon
Post #213305 22nd Feb 2013 6:29pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5938
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I hope its not warped or twisted as it had a new head about 3 years ago. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #213306 22nd Feb 2013 6:31pm
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couplands



Member Since: 31 Aug 2011
Location: Peak District & Cornwall
Posts: 1826
United Kingdom 2001 Defender 90 Td5 HT Oslo Blue
Might be worth putting it on a flatbed to check next time you take it off..
Post #213308 22nd Feb 2013 6:33pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610
United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
I wouldn't fret about a warped head just yet. Degrease as much of the rocker cover gasket surface as possible/practical. Try the Holdtite as it is 'fit for purpose' and a high grade and effective sealant and I reckon you'll have no further worries.

Thumbs Up If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #213310 22nd Feb 2013 6:35pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5938
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Its not the head I am taking off! But worth checking the flatness of the rocker. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #213311 22nd Feb 2013 6:35pm
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BigMike



Member Since: 13 Jul 2010
Location: Lancashire
Posts: 2253
United Kingdom 
Use permatex aviation number 3 or loctite 515
Post #213442 22nd Feb 2013 10:23pm
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df1



Member Since: 06 Aug 2011
Location: Ireland
Posts: 221
I'd imagine most of the products mentioned will do the job just fine.

I use Wurth products for various jobs and find them very good quality.
Post #213496 23rd Feb 2013 8:40am
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