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Author Subject: Engine running on silicone
dangti6

aka JKshooter

Location: Taunton, Somerset

Registered: 15 Jun 2006

Posts: 10,305

Status: Offline
Post #1
Forgive the random title - I really don't know how best to descibe what I was presented with this afternoon. Effectively, this engine has bogeys.

Whipped a cylinder head off and this is what I was greeted with. It appears this engine I've started to strip down has a hidden past.





You aren't seeing things.



Any ideas what on earth someone was trying to cure with what looks to be silicone in the oil ways? I presume they are the oil ways and not the water ways?

The only thing I can think is that it's from the sealing of the cam carriers. I did notice some excess sealent which had oozed out towards the spark plug side, so this could have made it way down. You'd need to use an awful lot I would have thought in order to end up like this.

Oddly the engine ran fine.

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    • Posted 16th Dec 2012 at 17:50
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

    Registered: 27 Mar 2007

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    Post #2
    that's the water ways, only one oil feed on these which is timing belt end at the front corner, and one return each side at the back.

    as that's a fibre gasket not MLS it has been apart before, probably had some k-seal s**te or something put in there.

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    Posted 16th Dec 2012 at 17:56
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    beez_neez_gt

    Seasoned Pro

    Location: @ de limit of adhesion !

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    Post #3
    Yep some k seal or similar, head may have rotted away by just using water which happened to my car, but instead of replacing the head housing they used a water seal.

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    Posted 16th Dec 2012 at 18:03
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    beez_neez_gt

    Seasoned Pro

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    Post #4
    Yep some k seal or similar, head may have rotted away by just using water which happened to my car, but instead of replacing the head housing they used a water seal.

    ________________________________________

    Pug fee`ver,

    Pick a Bogey, buy a Pug.

    Black 306 GTI 6 Standard, was 60k mileage, bargain!!

    Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url & =
    Posted 16th Dec 2012 at 18:04
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

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    Post #5
    A couple of the pistons have some odd marks at the top by the cut outs.





    Initially I thought it may have snapped a belt at some point, but when I've seen that in the past, the marks have been more obvious imprints where the valves have hit home. These appear to be odd nicks which if were valve related I'd have thought would be more than the odd few small ones.

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    • Posted 16th Dec 2012 at 18:20
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    24seven

    Seasoned Pro

    Location: Derby

    Registered: 05 Oct 2005

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    Post #6
    k-seal/radweld only dries when it comes into contact with air so it must have had an airlock in there or a dying gasket or similar at some point, unless that stuff is something else. Also 2 of your inlet valves are different to the others, which could mean it's had a rebuild following a snapped belt at some point possibly, like you suggested.

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    Posted 16th Dec 2012 at 18:46
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

    Registered: 27 Mar 2007

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    Post #7
    That will have been a snapper or bodged timing belt if it has those marks on the pistons.

    ________________________________________

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    Bring on the Trumpets.

    Posted 16th Dec 2012 at 18:51
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

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    Post #8
    Perfectly useable bottom end or would you avoid?

    I've looked at the head to see how much meat is on it for a future skim and wonder how much they start with. There's a bit on there, which by the minuscule amount a skim removes should be enough left for another.

    Here's what's left.





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  • Senior Test Automation Engineer for the 306GTi6 Owners Club Forum Wizard

    • Posted 16th Dec 2012 at 20:23
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

    Registered: 27 Mar 2007

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    Post #9
    you need to measure the height really, as for the bottom end, have seen many just slapped back together but how long they last after that who knows, I'd have it apart and inspect the journals bearings etc, check the bores as there are people after decent blocks.

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    Bring on the Trumpets.

    Posted 16th Dec 2012 at 20:28
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

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    Post #10
    If that requires more than a steel rule - it's beyond me LOL

    There are some fairy visual honing marks on the bores, so perhaps it's been apart in the past since.

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    • Posted 16th Dec 2012 at 20:35
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    pugjim

    Seasoned Pro

    Location: Sheffield

    Registered: 11 Mar 2007

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    Post #11
    I would be reluctant to put that together and think its going to be ok without a full strip down.
    Posted 16th Dec 2012 at 20:41
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

    Status: Offline
    Post #12
    It's not going to go back together per se. Both parts will go their seperate ways if they are usable. The head doesn't tap and providing there's enough meat on it I'm sure someone will make use of it.

    As for the bottom end, I'll perhaps strip it down and pester Welshpug! one image at a time asking what/how to do each step.

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  • Senior Test Automation Engineer for the 306GTi6 Owners Club Forum Wizard

    • Posted 16th Dec 2012 at 20:49
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

    Registered: 27 Mar 2007

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    Post #13
    from memory head is 137mm in height when new, 136.8+/- 0.05mm refaced

    ________________________________________

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    Bring on the Trumpets.

    Posted 16th Dec 2012 at 21:11
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