| [ Total Views: 1045 | Total Replies: 10 | Thread Id: 67485 ] |
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 76camper
Fahrvergnugen
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 posted on February 11th, 2008 at 07:38 PM |
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Engine Knock
My type 4 1800 twin carb engine has developed a knock, ive got no idea what it is....
Its not big end but maybe a lifter on the way out? Cam bearings?
here are two audio's of the engine idling.
Click here to watch Knock-2
Click here to watch Knock-1
any ideas?
was planning a trip up the coast (12hr round trip) in 2 weeks....
thanks
Edward
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1916baja
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| posted on February 11th, 2008 at 08:11 PM |
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When my 2L in my kombi started knocking my neighbour at the time (John Richardson) from volksworld said that was the end of it. I cant remember what
he said it was but i remember the look on his face when he heard it! did you have any loss of power at all? coz i did in mine.
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76camper
Fahrvergnugen
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| posted on February 11th, 2008 at 08:53 PM |
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power is fine, oil pressure is about 20psi at idle... then max pressure (60psi) by about 2500 rpm.
Just changed oil and filter on the weekend, no change.
i have noticed that it takes a little longer to build pressure on start up than it use to.
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 vw54
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| posted on February 12th, 2008 at 05:46 AM |
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I dont think you will be doing that 12 hour trip in a few weeks
get along to someone who knows VWs and let them havea listen before you destroy too much
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76camper
Fahrvergnugen
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| posted on February 12th, 2008 at 02:55 PM |
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took off the # 3 rocker assembly, ran the engine... no change
took off the #4 rocker assembly, ran the engine... no change
check both for wear, they look ok to me, will post a few pics of the adjuster and valve head faces (weird contact)
but then put a long screw driver to my ear and tracked down the noise a little better
checked:
lifter area on 3/4 side of crankcase - no noise
3/4 rocker cover - no noise
oil pump - no noise
sump - no noise
fan housing - no noise
then touched it on the 1/2 intake manifold and could hear the noise very distinctly
did the same to the 3/4 intake manifold but the noise was much much quiet (wouldnt think anything of it)
also doing the above on the exhaust you can hear it, quite a bit fainter than on the intake manifold tho
at this stage im thinking valve train on the 1/2, is there anything i should be looking for in particular? worn valve guides or something?
tonight ill take off the 1 and 2 rocker assemblies and see if there is any change....
what do you guys think? any input greatly appreciated!
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vw54
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| posted on February 12th, 2008 at 03:18 PM |
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sounds like a big end to me
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76camper
Fahrvergnugen
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| posted on February 12th, 2008 at 04:00 PM |
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from http://home.arcor.de/silke.fokken/sounds/
if you listen to the 'loose con rod' sound: http://home.arcor.de/silke.fokken/sounds/looserod.wav
i dont think it sounds like that, what does a small end bearing/bush sound like?
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vw54
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| posted on February 12th, 2008 at 04:05 PM |
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take it to a VW mechanic for a face up listen to it
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type3lover
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| posted on February 12th, 2008 at 06:57 PM |
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My 1800 camper sounds like that at idle too and that is after a freshen up with new bearings, rings & reco heads after a cam bearing lost its
thrust face. The timing was all over the place so at idle it was so retarded it sounded like a tractor! It had been reconditioned not too long ago and
all was within wear limits in the bottom end and cylinders. Sorry a bit OT.
I have replaced valves and the adjuster screws and even set at .004 (for testing purposes) and it still taps away on 1/2 side. I think in my case a
reground cam and wear in the lifters/rockers has upset the rocker geometry hence the noisy top end.
Now I just live with it It has been reliable.
Post that pic if you can mate.
.
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76camper
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| posted on February 12th, 2008 at 08:52 PM |
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tried taking off all the rocker shafts and running it (one at a time) and didnt really notice a difference in the tick/knock.
The noise has been around for a while, sounds alot like valve lash but doesnt dissappear with valve adjustment.
At this point im leaning towards small end or piston slap
here are the pictures of the adjusters (notice the contact wear patterns)
#1 Exhaust
#1 Inlet
#2 Inlet
#2 Exhaust
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76camper
Fahrvergnugen
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| posted on February 12th, 2008 at 08:57 PM |
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# 3 exhaust (pretty much vertical line of contact)
#3 inlet (line of contact from centre to bottom right)
#4 inlet (probably the most deformed, impacts all pretty uniform tho)
what are your thoughts?
#4 exhaust (impacts to the right and below of centre)
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