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Author Subject: Slight Tap???
mr_2807

Newbie

Location: Wrexham

Registered: 08 Apr 2010

Posts: 9

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Post #1
Hi just purchased a 306 Gti 6 non runner as it turned out it had snapped the woodruff key on the exhaust cam and all the valves etc where fine and tested and second hand cams fitted out of a spare head i had which was a snapper,put a head gasket waterpump etc etc on it fired it up and it was tappy so bein as i had a spare head removed those tappets and replace with spares once fully cleaned out.Still tapping changed the injectors as they are known to be noisy on these still no difference the car rum smoothly and pulls everyway it should,sailed through the emitions.Any ideas guys???been told these engine are relativly tappy any way?

Awaiting replys
Posted 2nd Jun 2010 at 03:03
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smegal

Seasoned Pro

Location: Leeds

Registered: 26 Dec 2005

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Post #2
It could have some slightly bent valves. The double springs mean that they still seal so it will run fine (until it eventually drops a valve)

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Posted 2nd Jun 2010 at 03:04
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mr_2807

Newbie

Location: Wrexham

Registered: 08 Apr 2010

Posts: 9

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Post #3
Easiest way to check this?All ideas welcome?
Posted 2nd Jun 2010 at 03:13
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smegal

Seasoned Pro

Location: Leeds

Registered: 26 Dec 2005

Posts: 5,940

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Post #4
does it sound like this

this

or this

This is mine and it was a tapper.

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Now in a Megane R26
Posted 2nd Jun 2010 at 03:28
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mr_2807

Newbie

Location: Wrexham

Registered: 08 Apr 2010

Posts: 9

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Post #5
Neither really more like the first but alot quieter,couldnt really tell from thos vid,s???????
Posted 2nd Jun 2010 at 11:38
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,839

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Post #6
It'll be a bent valve.

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Posted 2nd Jun 2010 at 13:23
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mr_2807

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Location: Wrexham

Registered: 08 Apr 2010

Posts: 9

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Post #7
Going to try some new tappets eventually as putting the second hand ones in that may have taken a knock wudnt help at all.If its a valve how long till it fails??
Posted 3rd Jun 2010 at 00:55
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,839

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Post #8
new tappets will not solve it.

a knock would not damage them, just think what happens several thousand times a minute as the camshaft spins above the tappet.....

BANG BANG BANG BANG Laugh my ass off

as for how long a bent valve will last before the head drops off, how long is a piece of string?

some have done no more than a few hundred miles, some tens of thousands, in each case the result is pretty terminal, giving you a pretty expensive and bloody heavy paperweight

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Posted 3rd Jun 2010 at 01:00
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mr_2807

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Location: Wrexham

Registered: 08 Apr 2010

Posts: 9

Status: Offline
Post #9
Thanks for the replies,i think i am goin to leave it and see what happens,as the car stands it owe's me next to nothing.I dont want to spend a fortune investigating into as i could be chasing my tail and spending more than the car is worth.if or when in blows up ill break it.i am still intersted in ideas.thanks everyone
Posted 3rd Jun 2010 at 02:29
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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

Posts: 3,702

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Post #10
BENT VALVE!!! Roll eyes Sorry matey as i've just found out to my expense it will be a bent valve no question, and personally i'd just fix it and save yourself a lot of heartache, do the job yourself it'll give a lot of satisfaction and save ya a few quid in the long run, just my 2p's worth! Thumbs up

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Posted 3rd Jun 2010 at 02:52
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mr_2807

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Location: Wrexham

Registered: 08 Apr 2010

Posts: 9

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Post #11
Its identifying the valve or valves,space and tools to do so also,how much did it set you back?
cheers for the reply
Posted 3rd Jun 2010 at 03:04
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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

Posts: 3,702

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Post #12
mr_2807 wrote:
Its identifying the valve or valves,space and tools to do so also,how much did it set you back?
cheers for the reply

Well i figured ut which valves using a screwdriver against the head... old school style and this was backed up by Carl AKA mechanical repairs when i told him what i'd done to make it happen in the first place, the car is still in pieces at the moment in my drive but i'm in no rush as its for track use only, but i reckon when its finished sortin out the tap will have probs cost ~ 100-150 tops because i'm doin it myself, the other option is get ya hands on a known good head and fit that? Unsure

*Edit* I suppose i am at an advantage as i have access to a workshop in work as i am a field service engineer on Gas powered engines so there is a good place to actually do the work on the head, however i would tackle it in my houshold garage (if i had one!) Roll eyes

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Posted 3rd Jun 2010 at 03:20
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mr_2807

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Location: Wrexham

Registered: 08 Apr 2010

Posts: 9

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Post #13
thinks that what my best option is as i know of a xsara VTS recently wrote off,Only thing puzzling me would the valve guide not crumble instantly and if the valves where bent even slightly and if the vavlves are bent would they not be well and truly f##kd and visible??poored petrol down the ports whent the head was off and it didnt leak one bit all looked fine...
Posted 3rd Jun 2010 at 03:22
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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

Posts: 3,702

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Post #14
mr_2807 wrote:
thinks that what my best option is as i know of a xsara VTS recently wrote off,Only thing puzzling me would the valve guide not crumble instantly and if the valves where bent even slightly and if the vavlves are bent would they not be well and truly f##kd and visible??poored petrol down the ports whent the head was off and it didnt leak one bit all looked fine...

No the valves may well not be visably bent, but believe me there will be some bent.... just the bends are so slight not detectable to the naked eye!Crazy Mad i know but thats all it takes!

*edit* Read This Thread Should explain it better! Thumbs up

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Posted 3rd Jun 2010 at 03:35
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mr_2807

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Location: Wrexham

Registered: 08 Apr 2010

Posts: 9

Status: Offline
Post #15
thanks for the help ill update on what i end up doing dont want to break as it a rallye and rare
Posted 3rd Jun 2010 at 03:31
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kit

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Registered: 22 Jan 2009

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Post #16
Here is a pic from 720puggti's thread. Can you spot the bent valves? Crazy

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Posted 3rd Jun 2010 at 04:39
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mabgti

NV motors

Location: Bham tunnel @7400rpm

Registered: 28 Aug 2003

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Post #17
1,4,6,7 do i get a prize??

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Posted 4th Jun 2010 at 01:28
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