displaying posts 1 to 20 of 20

Author Subject: Cambelt snap
9Freedman9

Newbie

Location: Chislehurst

Registered: 15 Jan 2012

Posts: 7

Status: Offline

Post #1
Hi guys, I am new here so apologies if this is in the wrong forum, I have purchased a 306 gti on an R plate with a failed cambelt, I am yet to remove the head and check for damage but I am pretty sure it's just the valves bent.

I have a list of the parts I need, which are;

1) Complete head gasket set.
2) Set of head bolts.
3) Inlet valves x 8.
4) Exhaust valves x 8.
5) Engine oil & oil filter.
6) Anti-freeze.
7) Timing belt kit.
8) Water pump (may not need it at the end of the day).


Obviously there may be some bottom half work needed, but what is the propability of this? How much are these parts and where would be the cheapest place to get it all from? I will propably leave the waterpump, what do you all think?

I do not want to go down the other engine route as I know the engine is pretty good in the car, it was previously owned by a member on here, I will upload a picture as soon as I find out how too!
Posted 15th Jan 2012 at 15:06
anth

Seasoned Pro

Location: Colchester

Registered: 04 Apr 2006

Posts: 3,651

Status: Offline

Post #2
Definitely replace the pump while your there!
Posted 15th Jan 2012 at 15:08
jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

Posts: 3,702

Status: Offline

Post #3
In all honesty I would remove the head before buying anything, if it's damaged a piston it would be much more economical to fit a second hand engine, but don't make any decisions on what's needed til u've checked the damage!Wink

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Posted 15th Jan 2012 at 15:14
9Freedman9

Newbie

Location: Chislehurst

Registered: 15 Jan 2012

Posts: 7

Status: Offline

Post #4
You have to be unlucky to have damaged a piston though surely? Even a conrod etc? What about sleve liners? Will they be ok?
Posted 15th Jan 2012 at 15:23
thugpuggin

Seasoned Pro

Location: Bristol

Registered: 10 Apr 2004

Posts: 26,784

Status: Offline

Post #5
Known to damage pistons Yes

Can't think of the threads which show the damage but it's not uncommon.

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Posted 15th Jan 2012 at 15:31
Mikey S

Junior User

Location: coventry

Registered: 11 Jan 2012

Posts: 93

Status: Offline

Post #6
to be honest, it'll be more down to what speed the engine was turning at to whether its damaged the pistons or not. idle speed and it'll probably just be bent valves but 6000rpm maybe a bit different! as above though, ALWAYS change the waterpump and make sure you have the head rebuilt by a confident engine builder who will check the valve guides as well.

remove the head before stumping up any cash for engine parts.

mike

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Posted 15th Jan 2012 at 15:39
csm

Newbie

Location: East Linton

Registered: 22 Nov 2011

Posts: 32

Status: Offline

Post #7
Mine snapped at idle in october last year.......... 5 bent valves was the outcome
Posted 15th Jan 2012 at 15:43
9Freedman9

Newbie

Location: Chislehurst

Registered: 15 Jan 2012

Posts: 7

Status: Offline

Post #8
It was pulling away in first when he heard it/felt it go, so he pulled over straight away and turned it off!
Posted 15th Jan 2012 at 15:44
ryangti6

Seasoned Pro

Location: Pontypool

Registered: 01 Sep 2006

Posts: 1,839

Status: Offline

Post #9
Make sure you also change the valve guides, these and bent valves being missed are the most common causes of these engines tapping after a rebuild.

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Posted 15th Jan 2012 at 16:47
dangti6

aka JKshooter

Location: Taunton, Somerset

Registered: 15 Jun 2006

Posts: 10,305

Status: Offline

Post #10
No use surmising. You won't know until you get the head off and assess the extent of the damage.

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  • Posted 15th Jan 2012 at 16:53
    jeffers Forum Admin

    Location: Leeds

    Registered: 14 Dec 2003

    Posts: 3,702

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    Post #11
    9Freedman9 wrote:
    You have to be unlucky to have damaged a piston though surely? Even a conrod etc? What about sleve liners? Will they be ok?

    I agree, but don't count on anything til u remove the head and check, if the bore is damaged the block is scrap also which could easily happen if the valve head comes off or even just a piece breaks off.... Check the condition of everythin before making a decision on a fix.

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    Posted 15th Jan 2012 at 16:54
    miles

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    Post #12
    No need to change the guides as they rarely give any issues, the amount of heads I have done and yet to replace any of them.

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    Posted 15th Jan 2012 at 20:27
    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

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    Post #13
    pistons made from cheeese!

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    Posted 15th Jan 2012 at 22:50
    jimmyhackers

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    Location: birmingham

    Registered: 14 Jun 2011

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    Post #14
    heres what a snapped cambelt will do



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    Posted 15th Jan 2012 at 23:11
    Rich E Forum Admin

    Location: Hertfordshire

    Registered: 27 Apr 2005

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    Post #15
    That's not from a cambelt failure.

    There are no marks on the other pistons and the valves from the rest of the cylinders seem okay.

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    Rich
    Posted 15th Jan 2012 at 23:19
    jimmyhackers

    Seasoned Pro

    Location: birmingham

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    Post #16
    oops sorry....your right. wrong photo.

    my bad Sad

    i cant find the other ones of my mates golf that happened the other month. similar extent of damage. engine ate itself apart.
    id suggest taking it apart and seeing the extent of the damage then thinking........"i need a new engine Sad"

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    Posted 16th Jan 2012 at 00:04
    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

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    Post #17
    that'd be a result of driving a tapper Thumbs up

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    Posted 16th Jan 2012 at 10:05
    stan_306gti6 Forum Admin

    Location: Kent

    Registered: 18 Jan 2004

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    Post #18
    welshpug! wrote:
    that'd be a result of driving a tapper Thumbs up


    Indeed it is, but the amount of people that still do it is shocking. It is a known fact that tappers WILL cause dropped valves at some point in the life of the engine, but it isn't considered a big enough risk by most to bother doing anything about it.

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    Posted 16th Jan 2012 at 11:49
    coskev

    Seasoned Pro

    Location: Oswestry

    Registered: 01 Nov 2009

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    Post #19
    miles wrote:
    No need to change the guides as they rarely give any issues, the amount of heads I have done and yet to replace any of them.


    Guides need checking though while its in bitsThumbs up

    I bought a head that was not off a snapper and all the exhaust valve guides needed replacing due to wear,so while the head is off and in bits they need checking.

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    Posted 20th Jan 2012 at 10:19
    stan_306gti6 Forum Admin

    Location: Kent

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    Post #20
    Yes, the guides should deffo be checked. I must admit, I have yet to find some that need replacing but generally after a snap and valves have been bent, the end of guides can get damaged so always worth checking. Yes

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    Posted 20th Jan 2012 at 10:41

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