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lboos
Samba Member
Joined: November 20, 2015
Posts: 443
Location: Marietta GA.
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 Posted: Fri May 23, 2025 8:40 am Post subject: valve clearance |
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Between valve adjustments, does the valve clearance increase or decrease do to normal wear ? Thanks
Last edited by lboos on Fri May 23, 2025 9:03 am; edited 1 time in total |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4384
Location: viroqua wi.
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| Posted: Fri May 23, 2025 8:46 am Post subject: Re: valve clearance |
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| lboos wrote: |
| Between valve adjustments, does the valve clearance increase or decrease. Thanks |
If parts wear evenly, neither. |
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BMFBMF
Samba Member
Joined: November 13, 2020
Posts: 448
Location: Swtzerland
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| Posted: Fri May 23, 2025 1:36 pm Post subject: Re: valve clearance |
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Generally valve seats wear and the gap closes up.
_________________
-----Slava Ukraini-----
1971 Stock South African Beetle 1300 : My mom's european "Thin Chick" spec. Completely stock with torsion bar front, swingaxle rear, smooth hubs, single MC, 40 mm shoes, 31PICT3 carb and 5 bolt drums all round, currently Running a 1976 SF:AS engine with the original SF:AD engine overhauled in a box, waiting to go back in one day. |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4384
Location: viroqua wi.
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| Posted: Fri May 23, 2025 1:49 pm Post subject: Re: valve clearance |
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| BMFBMF wrote: |
| Generally valve seats wear and the gap closes up. |
Or the adjusters wear more and it opens. |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 79217
Location: Sneaking up behind you
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| Posted: Fri May 23, 2025 1:56 pm Post subject: Re: valve clearance |
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| bsairhead wrote: |
| BMFBMF wrote: |
| Generally valve seats wear and the gap closes up. |
Or the adjusters wear more and it opens. |
Or the valve stem stretches and the gap closes up.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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עַם יִשְׂרָאֵל חַי |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4384
Location: viroqua wi.
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| Posted: Fri May 23, 2025 2:35 pm Post subject: Re: valve clearance |
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| Glenn wrote: |
| bsairhead wrote: |
| BMFBMF wrote: |
| Generally valve seats wear and the gap closes up. |
Or the adjusters wear more and it opens. |
Or the valve stem stretches and the gap closes up. |
I would find it hard to believe that the stem would stretch more than the adjuster would wear. |
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lboos
Samba Member
Joined: November 20, 2015
Posts: 443
Location: Marietta GA.
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| Posted: Fri May 23, 2025 4:41 pm Post subject: Re: valve clearance |
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I was just thinking, today I adjusted the valves on my 1972, I never noticed it before but on two of the cly's two of the valves were so tight I could not get .006 blade in, so I guess that means the valve clearance decrease's with normal wear. Thanks anyway  .
Last edited by lboos on Sat May 24, 2025 5:07 am; edited 1 time in total |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4384
Location: viroqua wi.
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| Posted: Fri May 23, 2025 5:50 pm Post subject: Re: valve clearance |
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| lboos wrote: |
| I was just thinking, today I adjusted the valves on my 1972, I never noticed it be for but on two of the cly's two of the valves were so tight I could not get .006 blade in, so I guess that means the valve clearance decrease's with normal wear. Thanks anyway . |
That would only be logical if they all did. So the other 2 cylinders all was normal? And was it just exhaust or intake or one of each? And were the 2 cylinders on the same bank? |
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lboos
Samba Member
Joined: November 20, 2015
Posts: 443
Location: Marietta GA.
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| Posted: Sat May 24, 2025 5:31 am Post subject: Re: valve clearance |
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| bsairhead wrote: |
| [quote="That would only be logical if they all did. So the other 2 cylinders all was normal? And was it just exhaust or intake or one of each? And were the 2 cylinders on the same bank? |
Your prob. right, The tight valves were on #2 and #4 cly don't remember which valve, the other valves were slightly loose.
The reason I adjusted the valves was when I was going up a hill I noticed a valve rattle when under a load, after the valve adjustment no more valve rattle.
Thanks for all the advice, I've been around VW bugs since the 60's, love to drive them, but still don't know a whole lot about them mech  . |
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baldessariclan
Samba Member
Joined: October 14, 2016
Posts: 1958
Location: Wichita, KS
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| Posted: Sat May 24, 2025 6:11 am Post subject: Re: valve clearance |
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Yeah, you want to keep an eye on any valves that require significant readjustment over short intervals, especially exhaust valves. If one or more of them is consistently tight every time you check & readjust, can sometimes be a sign that the stem is stretching, and may be getting ready to break - !!
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1971 Standard Beetle — fairly stock / driver
baldessariclan -- often in error, never in doubt... |
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