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Core Plug Sealant
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jensen541



Joined: 03 Dec 2007
Posts: 56

PostPosted: Mon Jan 19, 2009 5:52 pm    Post subject: Core Plug Sealant Reply with quote

Evening

I have removed the core plugs from the Jensen block as it seemed prudent with the engine was out and one section between plugs was completely blocked, so I'm glad I did. There seemed to be some type of core plug sealant in there, looked like silicone to me. Is that correct or is there something better?

Also I will be replacing both crank and rod bearings. I know there is a thread further down regarding grease (thought that covered wheel bearings?) but what would to blokes suggest be better, graphite grease or lithium for the these bearings?

Ta
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peter scott



Joined: 18 Dec 2007
Posts: 6194
Location: Edinburgh

PostPosted: Mon Jan 19, 2009 6:19 pm    Post subject: Reply with quote

I would recommend a little "Hylomar" around your core plugs prior to fitting.

I'm confused by your bearings reference. If you are asking about fitting the main and big-ends then the backs of the shells and the housings should be completely clean and dry without any lubricant or sealant but you should smear the bearing surfaces and crank journals with good quality engine oil. I would recommend fully synthetic because it will be sure to remain on the surfaces. Don't use grease.

Peter
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jensen541



Joined: 03 Dec 2007
Posts: 56

PostPosted: Mon Jan 19, 2009 6:50 pm    Post subject: Reply with quote

Well now I'm confused as well Peter!

Chatting to a bloke today who recommended packing 'can't use too much' of something called 'Graphaline' or something like that. Which I took to mean some sort of graphite substance.
I will bow to your knowledge on this though.

Thanks Brian
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emmerson



Joined: 30 Sep 2008
Posts: 1246
Location: South East Wales

PostPosted: Mon Jan 19, 2009 10:00 pm    Post subject: Reply with quote

Oil is what the bearings were designed to run in, so that would be best.
Grease could just block an oilway for that few vital seconds on start-up.
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wrinx



Joined: 22 Jun 2008
Posts: 142
Location: Derbyshire

PostPosted: Tue Jan 20, 2009 9:14 am    Post subject: Reply with quote

Perhaps the chap was referring to engine rebuild grease/assembly grease?

wrinx
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peter scott



Joined: 18 Dec 2007
Posts: 6194
Location: Edinburgh

PostPosted: Tue Jan 20, 2009 10:59 am    Post subject: Reply with quote

I can't see any connection between shell bearings and grease though.

Peter Confused
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Jonv8



Joined: 28 Jan 2009
Posts: 66

PostPosted: Sat Jan 31, 2009 9:52 pm    Post subject: Reply with quote

The product is called Graphogen - think thats the correct spelling.I used to use it on shell bearings in engines that I was assembling for a local reconditioner,the theory was that it would sit inthe bearing for ages incase the engine was not used immediately after the build.Also used it on cam lobes - esp good for v8's etc that relied on drainback from the valvegear to lube the cam/followers.
If anyone is after some I'll check on the box for contact details - there is still a box sitting in my toolbox.
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PAUL BEAUMONT



Joined: 27 Nov 2007
Posts: 1279
Location: Barnsley S. Yorks

PostPosted: Mon Feb 02, 2009 1:53 pm    Post subject: Reply with quote

I'm pretty sure that you are correct Jonv8. I also use Graphogen for the same purpose. Got a tube of the stuff on my shelf at home - but that's 50 miles away just now!!
PAUL
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jensen541



Joined: 03 Dec 2007
Posts: 56

PostPosted: Fri Feb 13, 2009 9:18 pm    Post subject: Reply with quote

Thanks Paul & Jon

I now have my very own tube!

Brian
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