| [ Total Views: 769 | Total Replies: 12 | Thread Id: 95166 ] |
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 beachbuggy61
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| posted on February 2nd, 2012 at 10:34 PM |
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Tappets keep going out of adjustment
Hi,
I have elephant foot (swivel) type adjusters on my rockers (1.25:1) and I can't seem to get them to stay quiet.
Any ideas on whether there are better adjusters to have? Are the ones that adjust on the push rod end any better?
Many thanks, Marc.
Baja
1915cc's of raw power 
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"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
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 matberry
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| posted on February 2nd, 2012 at 11:27 PM |
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They are normally a good adjuster, but there are heaps of things that may be making the tappets noisey. What are you setting them to? Do you know
what cam it is? Have you chromoly pushrods? How old is the engine?
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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matberry
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| posted on February 2nd, 2012 at 11:31 PM |
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Also do you have the rockers shimmed for end float or std wavey washers and clips?
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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beachbuggy61
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| posted on February 3rd, 2012 at 08:58 AM |
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Hi Matt,
Setting them to 4 thou
Engel W120 cam
Chrome moly pushrods
Engine virtually new
Solid shafts with shims
Hope that helps with diagnosis!
Cheers
Baja
1915cc's of raw power
Turbocharger
Intercooler
EFI
Crank fired Ignition
Runs E85
Engineered
"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
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vlad01
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| posted on February 3rd, 2012 at 09:03 AM |
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have you got matching cam and lifters?
using standard oil or high zinc?
Also CrMo pushrods don't expand with the engine as the same rate so they get noisier as it heats up, also is you engine running at correct temps and
not too hot?
I am no expert on CrMo pushrods but I beleive they run zero or close to zero lash for the lack of expansion they have.
Also I have read 1.25 is a bad ratio number becaue of float, harmonics and over lift (term?) Stock or greater than 1.3 is recomended by guys like at
GB enterprises.
This aprently caused mushrooming of the valve stem and therfore make the need for adjusting all the time.
This happen to a guy on here last last year (yes 2010) and I ended up sugesting this ratio problem and mushrooming and I got it right.
Yeah just some ides for ya.
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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matberry
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| posted on February 3rd, 2012 at 09:13 AM |
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Yep, the moly pushrods have a different expansion rate so a different clearance. Zero lash is a concern for me, I set to .002" as this gives an
actual feeler gauge clearance and gives your engine a small amount of room for wear/temp variations and allows for a service interval. At zero you run
the risk of the valve not closing fully if anything changes, but if you want to check them weekly or daily, you could even try zero to check how it
sounds.
Side clearance also makes tappet noises, so as you check each cylinders valve clearance, you also want to check the side clearance, also you want
around .002".
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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68AutoBug
A.k.a.: Lee Noonan
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| posted on February 3rd, 2012 at 10:10 AM |
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| Quote: | Originally
posted by beachbuggy61
Hi,
I have elephant foot (swivel) type adjusters on my rockers (1.25:1) and I can't seem to get them to stay quiet.
Any ideas on whether there are better adjusters to have? Are the ones that adjust on the push rod end any better?
Many thanks, Marc.
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Hi Mark
You are saying they are noisy and You want to quiet them down..
but then saying You can't keep them adjusted??
so are they noisy because they won't stay adjusted??
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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beachbuggy61
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| posted on February 3rd, 2012 at 10:46 AM |
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Hi Lee,
Yes it's more that they don't stay quiet, so I guess they're going out of adjustment, which in itself is potentially an issue.
Thanks for all the tips. I think I'll start by setting them at .002" and see how I go (I didn't realise about the temperature expansion differences
being that different to normal push rods). I was always a bit warey about setting them too close because I didn't want them riding, and since the
book says .004 - .006, I figured .002 might be too tight, but I'll give that a crack.
If they then go out again I'll start investigating the mushrooming/ratio things (although I haven't noticed any mushrooming of the valve when I've
been adjusting them in the past)
Gotta love investigative engineering eh?
Thanks again 
Baja
1915cc's of raw power
Turbocharger
Intercooler
EFI
Crank fired Ignition
Runs E85
Engineered
"The Lord does not subtract from the life of a man, the hours spent on his Volkswagen" Anon. |
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68AutoBug
A.k.a.: Lee Noonan
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| posted on February 3rd, 2012 at 03:00 PM |
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You can buy caps to go over the end of the valves
at least I think I saw them for sale somewhere
maybe in the USA??
so that should stop mushrooming or spreading of the valve ends
is Your engine tappet noise louder than a normal vw engine?
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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narumi
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| posted on February 3rd, 2012 at 03:19 PM |
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I have CrMo pushrod on STOCK rocker
and verry little tappet noise at 0.08mm
maybe install louder exhaust and big audio systems
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68AutoBug
A.k.a.: Lee Noonan
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| posted on February 3rd, 2012 at 05:35 PM |
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I used to have a standard muffler with straight thru pipes and it was VERY Noisy...
so, never ever heard anything... lol
now with extractors and a quiet muffler....
they just sound normal for a beetle... lol
except when I have the heater turned on..
the tappet noise comes thru the heaters... lol
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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grumble
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| posted on February 3rd, 2012 at 05:48 PM |
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Do the ball adjusters have a flat spot to sit on the valve stem? Sometimes the ball swivels and if the valves are set on the ball it will then turn
whilst the engine is running until it hits the flat and then has excess clearance.
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waltermitty
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| posted on February 3rd, 2012 at 07:24 PM |
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are you setting clearance when engine is cold?
23 windows ...8 too many!
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