| [ Total Views: 936 | Total Replies: 19 | Thread Id: 63406 ] |
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 Ian Bugden
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 posted on June 26th, 2007 at 08:01 PM |
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noisey Valves
Hi,
I have recently (yesterday) adjusted the valves on my 36hp beetle and they seem to be noisier now that before. I adjusted them to .006" which I know
is the specs for all later engines but I could not find and specs for the 36hp. I have double checked them and everthing but now they seem to be a
bit louder that before, in particular the LHS ones.
Any suggestions?? is .006" the right clearance?
The valves were done cold so you can eliminate that.
Cheers.
Ian Bugden
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But a true friend will be sitting next to you saying "Damm that was fun!!!"
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jo_tas
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| posted on June 26th, 2007 at 08:06 PM |
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Were they tight before?
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Craig Torrens
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| posted on June 26th, 2007 at 08:10 PM |
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36hp are .004"
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 vw54
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| posted on June 26th, 2007 at 08:30 PM |
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use 0.006" better and VW approved for all engines
Did you take out the adjuster screws and remove or re round the faces of the tappet so there no gaps and you have 2 clean faces to set the clearence
gap to.
sometimes theres an excessive gap when the tappet screws isnt sitting flat against the valve stem
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Ian Bugden
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| posted on June 27th, 2007 at 07:26 PM |
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Hi,
The valve train was strarting to get a little noisy hence why I thought I would do the adjustment. Some seemed tight, others felt loose. I haven't
checked if they are long studs or short studs that hold the rocker ass. as I have heard and read that the clearance needs to be different.
What makes the valve noisy, is it too much clearance or too little? I know tight valves will ruin the valve seats.
Ian.
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MickH
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| posted on June 27th, 2007 at 07:38 PM |
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To much clearance will make them noisy.Not trying to be a smartass..but did you do them in the right order ?? ie... compression stroke TDC on number 1
and 180 degree rotation BACKWARDS to do number 2 etc etc..? Setting them to 006 is the way to go. If it was me I'd be trying to do them again and
double checking everything:beer
tssnq.com.au
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type3lover
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| posted on June 27th, 2007 at 08:17 PM |
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Hi Ian,
In this case looser is better ;-) I would agree with .006"
I'd recheck them making sure that the order you turn the engine and adjust each valve is spot on.
To risk stating the obvious again possibly, you should feel slight drag (not binding) with the feeler guage when the gap is right. Also check it again
after you tighten the adjusting nut.
You may have a reground cam in which case the valves might just be a bit noisier than on a new cam due to the adjusters acting on the valve tips at a
different angle. Or the adjusters might be worn as Dave suggested.
Hope this helps.
Toby :thumb
[ Edited on 27-6-2007 by type3lover ]
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vw54
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| posted on June 28th, 2007 at 07:06 AM |
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Yes do them in order makes a difference with the engine being rotataed in the correct direction takes all the slack out
also thought of another cause
remove the rocker arm assemblies and pull apart and check the rocker arm shafts for wear .... if these are worn it wont matter how many times you
adjust they will always be out of wack
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Ian Bugden
A.k.a.: Ian Bugden
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| posted on June 28th, 2007 at 07:21 PM |
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Hi,
OK, I know that I hand No.1 on tdc, and yes i did rotate the engine backwards and start at 1 then2,3,and then 4. I will re chack them again and re
adjust on the weekend as it is too bloody cold to do them after work.
Thanks
Will let you know on progress.
Ian
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But a true friend will be sitting next to you saying "Damm that was fun!!!"
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type3lover
A.k.a.: The Smashed Repairer
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| posted on June 28th, 2007 at 09:39 PM |
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| Quote: | Originally
posted by Ian Bugden
OK, I know that I hand No.1 on tdc
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On the compression stroke? The cam rotates one revolution to every two of the crankshaft.
To check: get engine to No.1 TDC and remove the distributor cap. The rotor must be pointing to where the plug lead to No.1 is. If not it's 180
degrees out.
You're right about it being too bloody cold to work on the car after work!!
Cheers, T
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Ian Bugden
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| posted on July 3rd, 2007 at 05:46 PM |
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Yeah, definatly on No. 1 tdc rotor cap pointing at the mark, and no3 on the rocker. Found3 valves that were a little loose so adjusted them and the
engine is quieter, but still one the louder side of normal, I am thinking of adjustiong them to 5 thou. I have a aneaking suspision that the 36hp is
meant to be at 4 thou but I will play it safe and go 5 thou.
Ian.
A good friend will come and bail you out of jail.....
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vw54
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| posted on July 3rd, 2007 at 05:52 PM |
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did u pull the rocker assys and check the wear in the arms and shafts
did you re face the tappet screws ???
leave them at 0.006 and you wont have any problems
Volkswagen put out a service bulletin in about 1972 or so stating that all tappet clearence adjustements on Air cooled engines be revised from
0.004 to 0.006"
Lots of manual stated 0.004 but this is incorrect
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dangerous
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| posted on July 3rd, 2007 at 05:55 PM |
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Often the tip of the valve also gets a little dished
and so even though a .004 feeler will fit nice it may easily be twice that.
Use a dialindicator to see if that is the case.
Will most likely need the tips machined or new valves eventually.
6 or 4 will be fine, as long as it is real.
36ers all have short studs I think.
The ones you are thinking of are the early 40 horse deals that had .008" I think.
I once had a rattly tappet and kept going tighter till it burnt the valve.
On dis-assembly I found thet 'tappet' noise was infact a loose bush in the conrod
where the gugeon pin runs.
| Quote: | Originally
posted by westi
That's mad Alan.
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vw54
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| posted on July 3rd, 2007 at 06:08 PM |
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| Quote: |
I once had a rattly tappet and kept going tighter till it burnt the valve. On dis-assembly I found thet 'tappet' noise was infact a loose bush in
the conrod where the gugeon pin runs.
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Thats a funny one Davo did u use the old screw driver to the ear test procedure works all the time full plastic or wodden handles the
prefered test instrument
yeah very important the tappet to valve face always creates a problem especially on high milage engines that havent been looked after
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Ian Bugden
A.k.a.: Ian Bugden
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| posted on July 4th, 2007 at 05:17 PM |
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Yeah it seems odd that the slightedt tweak in valve adj has made them noisy. I will pull the rocker arms and grind the faces. Do I grind them flat
or rounded??? The engine was out for the first time about 7 years ago and had a top end rebuild useing good 2nd hand parts and has been very well
looked after in the 8 years I have owned the car. I wouldn't think the ends of the valves to be that concave so am assuming it to be the rocker.
Ian.
A good friend will come and bail you out of jail.....
But a true friend will be sitting next to you saying "Damm that was fun!!!"
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vw54
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| posted on July 5th, 2007 at 11:06 AM |
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the tips of the tappet screw should be rounded
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oval TOFU
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| posted on July 5th, 2007 at 06:41 PM |
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dam, i did my 40HP to .004" coz i thought they were too wide. Sounds like it'll have to put em to .006 then... gaaah
Dave, I've still gotta check the type of studs I got! Yes, i'm a slack cint.
...and Robert's ya father's brother...
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vw54
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| posted on July 6th, 2007 at 06:55 AM |
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Chris i thought u would have dont that ages ago
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oval TOFU
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| posted on July 10th, 2007 at 03:34 PM |
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It keeps on slipping my mind. I've adjusted my tappets 4 times, but i havn't had a good look at my studs yet. Mark tells me it could be a noisy
valve guide too - which makes sense as the noise occurs when the engine is warm and at constant throttle...
...and Robert's ya father's brother...
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vw54
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| posted on July 10th, 2007 at 05:35 PM |
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get under that bloody car
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