Sandwich Plate Sealant

[James Cornell 10]

Just a quicky, I am doing a full rebuild in my d6b 1.9 and I want to know what is the best sealent for the Ali sandwich plate which mates to the bottom of the block?

[welshpug 1,662]

any decent rtv will do the job.

 

if I have time I lay a decent bead on and leave it half an hour before fitting the plate and loosely bolting it down when its tacky, leave it a bit longer then nip up and fit the sump and gasket/sealant as applicable, same process again if its sealant.

[ALEX 98 1 Cars]

I never have much luck sealing sumps.

I've even bought an ally one as I assumed the problem was the expansion rate is different with steel and ally causing the sump to leak.

I've put it down to poor design or cheap gaskets as it apears to come from the bolt holes.

 

I'm going to use sealent on both sides of the gasket aswell as the sandwich plate this time in a final attempt to seal the sump.

If that doesn't work, the car is going to live over an oil drip tray.

[welshpug 1,662]

gaskets dont need sealant, and if the plate leaks theres contamination damage or not enough sealant.

[Miles 331 1 Cars]

As above, sealant on gaskets do not let the gasket seat as they should, they OE gaskets eat into the block and sump is the theory (Pattern ones normally do not), They normally take a few rounds of tightening up the bolts to bed in thou,

[James Cornell 10]

Sorry to all of you that have replied so promptly I don't think I have been very clear in my question. I realise that there is a gasket between the sandwich plate and the sump pan and I intend to replace that and fit it dry. I was referring to where the sandwich plate bolts to the bottom on the block.

 

James

Edited October 17, 2014 by James Cornell

[Tom Fenton 1,542]

Use RTV silicone between spacer and block. Ensure both surfaces are spotlessly clean and most importantly oil free, I degrease with brake cleaner.

Then put a small bead on one surface then bolt up straight away. Leave the silicone to cure totally before you put any oil in.

 

I have never had success with dry gasket alone on the sump, I use Stag Wellseal both sides of a gasket on the tin sumps, this has been leak free for me, but as above its usually needed to go round the bolts a couple of times as the gasket beds down with heat cycles.

[James Cornell 10]

Thanks Tom, I will be rebuilding next week a all being well

[petert 590]

This is how I do it and my sumps don't leak. With both surfaces super clean, apply a very thin coating of ThreeBond 1211 to BOTH surfaces. Bolt down the sandwich plate with both the two M6 cap screws and M7 bolts with spacers. Clean up any drips, dribbles etc and let dry for overnight. Then remove the M7 bolts and repeat the process with the sump.