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 Post subject: Does rocker cover need silicon ??
PostPosted: Thu Jun 14, 2018 4:45 pm 
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Joined: Wed May 09, 2018 11:48 am
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Location: brisbane
I recently painted the rocker cover on our new engine and replaced the gasket and didn't bother with silicon as the other gaskets I have seen recently had no silicon however it started to weep almost immediately and is making a mess. Is it usual to have to use silicon on these.. Normally I would have but there seemed to be none on there originally on either gti engines we have had recently.. If it does need it.. should it go on both sides of the gasket or just the bottom side where it meets the head ??? Cheers ..


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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Thu Jun 14, 2018 4:55 pm 
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Joined: Mon Oct 12, 2015 11:30 am
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Location: Napier
I replaced the gasket on mine a while ago and it did not leak except where there is a bolt missing due to being snapped off. I did not use any gasket sealant or such. Perhaps there is an issue with the PCV? Too much pressure in the head not being vented? Just a wild thought.

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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Thu Jun 14, 2018 5:57 pm 
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Joined: Fri Sep 03, 2010 10:41 am
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Location: Bunya QLD 4055
Just on the corners of the outer cam bearing caps where they meet the cover and the head face. That is the most likely place. If you use a silicon gasket the sealing is better.

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If "X" is an Unknown quantity, and a Spurt is a drip under pressure, then an "EXPERT" is an "Unknown Drip Under Pressure".
Why dont they just call it "Womenapause" instead.


Last edited by pictureshowman on Fri Jun 15, 2018 8:04 am, edited 2 times in total.

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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Thu Jun 14, 2018 6:43 pm 
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Joined: Wed May 09, 2018 11:48 am
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Location: brisbane
Hhmm.. OK.. I will redo it with silicon and check the pc valve to make sure it is opening..


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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Thu Jun 14, 2018 8:52 pm 
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Joined: Mon Oct 12, 2015 11:30 am
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Location: Napier
I am replacing the cams on mine soon so will seal with a gasket sealant when it goes back on, just to be sure to be sure.

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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Thu Jun 14, 2018 9:04 pm 
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Joined: Wed Sep 29, 2004 8:01 pm
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Location: Orange NSW
You didn't over tighten the rocker cover bolts?


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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Thu Jun 14, 2018 9:15 pm 
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Joined: Wed May 09, 2018 11:48 am
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Location: brisbane
I just realized it wouldn't matter if the pcv isn't opening as there is a second vent from the rocker cover that is sucking all the time..


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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Wed Jun 20, 2018 12:40 pm 
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Joined: Mon Jun 16, 2008 7:02 pm
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Location: Northern Beaches
I'm about to silicon mine as there is a annoying smear of oil always escaping the dizzy side of the rocker cover. I have a new gasket lying around but will try the silicon method first. I've found Selley's 'Wet Area' silicon works in these situations.


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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Thu Jun 21, 2018 10:07 am 
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mk1croc wrote:
I'm about to silicon mine as there is a annoying smear of oil always escaping the dizzy side of the rocker cover. I have a new gasket lying around but will try the silicon method first. I've found Selley's 'Wet Area' silicon works in these situations.


I'd be more inclined to just use the Permatex Black or Grey. I would not trust a product designed for the bathroom to handle the heat and oil of an engine.

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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Fri Jun 22, 2018 12:38 pm 
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Joined: Mon Dec 19, 2016 10:40 am
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Location: NZ
Ok guys this is something I do know a bit about.

Firstly what pictureshowman said. And I believe he means the silicone just in those two cam cap corners and not the whole cover. I have a new gasket and I used silicone just in those corners....it does not leak anywhere. Torque the bolts down as per the manual.

I would never silicone the whole thing leaving the gasket off....bloody mess. Especially if you have to take the cover off. 8-[


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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Sun Jun 24, 2018 7:38 am 
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Joined: Tue Sep 17, 2013 7:12 pm
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Location: Brisbane
I will agree with those corners leaking more but i also use a mild thread locker on the cover bolts. Mine used to work their way loose after a few weeks. I ended up using a flange sealer that stays soft and sticky and won’t totally harden up for reasonably easy removal and cleans up with turps or metho. No leaks for a few years so far.


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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Sun Jun 24, 2018 10:18 am 
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Joined: Wed May 09, 2018 11:48 am
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Location: brisbane
I ended up giving both surfaces of the new gasket a lick of black permatex and it seems to have fixed the problem..


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 Post subject: Re: Does rocker cover need silicon ??
PostPosted: Wed Jun 27, 2018 2:43 pm 
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Joined: Fri Sep 03, 2010 10:41 am
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Location: Bunya QLD 4055
I find these to be the best I have used: https://www.ebay.com.au/itm/VALVE-TAPPE ... Sw2gxYnAJx

_________________
If "X" is an Unknown quantity, and a Spurt is a drip under pressure, then an "EXPERT" is an "Unknown Drip Under Pressure".
Why dont they just call it "Womenapause" instead.


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