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70Crew Samba Member
Joined: June 12, 2006 Posts: 776 Location: Grand Rapids, MI
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Posted: Mon May 15, 2017 5:41 pm Post subject: Correct valve clearance? |
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First time adjusting my valves. I feel comfortable with the process but am seeing conflicting info on the correct clearance setting. The owner's manual and VW Service manual both say set the valves at .004. Bentley and most on-line "how to" videos say .006. Which is correct? Engine is a stock crate engine built by CPR, 1600 single port. _________________ 1970 Crew Cab |
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Randy in Maine Samba Member
Joined: August 03, 2003 Posts: 34890 Location: The Beach
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70Crew Samba Member
Joined: June 12, 2006 Posts: 776 Location: Grand Rapids, MI
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Posted: Mon May 15, 2017 5:58 pm Post subject: Re: Correct valve clearance? |
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Thanks Randy! I have adjusted valves on other cars so I am comfortable using the standard gauge, just wanted to be sure I was using the right one. _________________ 1970 Crew Cab |
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nodrenim Samba Member
Joined: October 06, 2006 Posts: 843 Location: Dobson, North Carolina
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Posted: Mon May 15, 2017 6:12 pm Post subject: Re: Correct valve clearance? |
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Some after market cams specify setting of .004, Just thought I'd kick in my 2 pennies worth. Good luck on your project! |
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70Crew Samba Member
Joined: June 12, 2006 Posts: 776 Location: Grand Rapids, MI
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Posted: Mon May 15, 2017 6:23 pm Post subject: Re: Correct valve clearance? |
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Thanks.... stock cam (or at least it was supposed to be). _________________ 1970 Crew Cab |
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nemobuscaptain Samba Member
Joined: March 07, 2002 Posts: 3874
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lil-jinx Samba Member
Joined: August 14, 2013 Posts: 1109 Location: New Brunswick,Canada
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rockerarm Samba Member
Joined: December 16, 2009 Posts: 3552 Location: Los Angeles
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Posted: Mon May 15, 2017 9:12 pm Post subject: Re: Correct valve clearance? |
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lil-jinx wrote: |
I think the .004 was for sodium filled valves. |
Ahhh, no. The type 4 bus (1800) engine spec'd .008". This could be at allow the exhaust valve to rest on the seat a bit longer?
Bill. |
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Malokin Martin Samba Member
Joined: August 19, 2007 Posts: 3093 Location: E-burg
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Posted: Mon May 15, 2017 9:27 pm Post subject: Re: Correct valve clearance? |
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Vw used to have different clearances for exhaust/intake. Eventually they just recommended everything 006. The conflicting lower clearances are from old sources. |
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Mellow Yellow 74 Samba Member
Joined: October 14, 2014 Posts: 1615 Location: Sydney, Australia
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Posted: Mon May 15, 2017 9:30 pm Post subject: Re: Correct valve clearance? |
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I do 0.006 on intake and 0.008 on exhaust on my 1800 _________________ 1962 Karmann Ghia
1974 Deluxe Microbus
1985 Caravelle (Vanagon) |
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wcfvw69 Samba Purist
Joined: June 10, 2004 Posts: 13385 Location: Arizona
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Posted: Mon May 15, 2017 9:36 pm Post subject: Re: Correct valve clearance? |
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Malokin Martin wrote: |
Vw used to have different clearances for exhaust/intake. Eventually they just recommended everything 006. The conflicting lower clearances are from old sources. |
And... they opened it up a bit for some wiggle room since so many owners failed to EVER get their valves adjusted... _________________ Contact me at [email protected]
Follow me on instagram @sparxwerksllc
Decades of VW and VW parts restoration experience.
The Samba member since 2004.
**Now rebuilding throttle bodies for VW's and Porsche's**
**Restored German Bosch distributors for sale or I can restore yours**
**Restored German Pierburg fuel pumps for sale or I can restore yours**
**Restored Porsche fuel pumps or I can restore yours**
**Restored Porsche distributors or I can restore yours** |
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lil-jinx Samba Member
Joined: August 14, 2013 Posts: 1109 Location: New Brunswick,Canada
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Posted: Tue May 16, 2017 7:41 am Post subject: Re: Correct valve clearance? |
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rockerarm wrote: |
lil-jinx wrote: |
I think the .004 was for sodium filled valves. |
Ahhh, no. The type 4 bus (1800) engine spec'd .008". This could be at allow the exhaust valve to rest on the seat a bit longer?
Bill. |
I stand corrected. _________________ https://www.thesamba.com/vw/forum/viewtopic.php?t=620186
https://www.thesamba.com/vw/forum/viewtopic.php?t=668799
1974 Bay Westfalia. she likes to be called Ethel.
1968 Dune Buggy
1974 parts bus
A smart man learns from his mistakes,a very smart man learns from other's mistakes. |
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otiswesty Samba Member
Joined: November 21, 2006 Posts: 1729 Location: Portland
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Posted: Tue May 16, 2017 2:48 pm Post subject: Re: Correct valve clearance? |
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The camper special kit asks for 0 (zero) lash. Why would this not result in the exhaust valves being burned. What is the difference here, just looking at the old and new parts out of the bus, there does not seem to be a huge difference. _________________ 1978 Sage Green P22 Westfalia
1989 T3 Syncro Single cab
Just a regular guy |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50261
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Posted: Tue May 16, 2017 4:07 pm Post subject: Re: Correct valve clearance? |
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otiswesty wrote: |
The camper special kit asks for 0 (zero) lash. Why would this not result in the exhaust valves being burned. What is the difference here, just looking at the old and new parts out of the bus, there does not seem to be a huge difference. |
Steel aftermarket verse the OEM aluminium pushrods, steel having a lesser amount of thermal expansion.
Some people set the valves at .002" of lash when using steel pushrods as doing so allows the valves to close fully during warm up. |
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roadron Samba Member
Joined: October 15, 2004 Posts: 215 Location: taos new mexico
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Posted: Tue May 16, 2017 7:51 pm Post subject: Re: Correct valve clearance? |
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my 73 1700 owners manual actually calls for .004 and that's what I use. my valves rarely go out of adjustment and when they do they go a little loose. go figure ! _________________ 73 WESTY SO72-6 with continental bed
Last edited by roadron on Wed May 17, 2017 6:55 am; edited 2 times in total |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50261
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Posted: Tue May 16, 2017 10:06 pm Post subject: Re: Correct valve clearance? |
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My remembrance was that the .004" valve clearance was for a Type 1 engine with 10mm head studs. Been lots of years so I could well be wrong. |
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Amskeptic Samba Member
Joined: October 18, 2002 Posts: 8568 Location: All Across The Country
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Posted: Wed May 17, 2017 6:59 am Post subject: Re: Correct valve clearance? |
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roadron wrote: |
my 73 1700 owners manual actually calls for .004 and that's what I use. my valves rarely go out of adjustment and when they do they go a little loose. go figure ! |
No it doesn't.
Colin _________________ www.itinerant-air-cooled.com |
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Amskeptic Samba Member
Joined: October 18, 2002 Posts: 8568 Location: All Across The Country
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Posted: Wed May 17, 2017 7:06 am Post subject: Re: Correct valve clearance? |
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Wildthings wrote: |
My remembrance was that the .004" valve clearance was for a Type 1 engine with 10mm head studs. Been lots of years so I could well be wrong. |
All Type 1 engines with the rocker studs (vs through-bolts) were .004" until the Great Valve Burning Era in the late 60s.
Turns out that the high volume dealerships were not doing valve adjustments stone cold as specified. No, they would start up a VW, drive it from the lot into the bay, adjust the valves to .004" and the valves would be too tight. The aluminum directly under the rocker supports would expand within just the two minutes or so of driving into the dealer bay, thus lifting the adjusting screws away from the valves, giving an artificially higher valve clearance.
So, the .006" clearance specification was born to give the engines a chance.
The .008" clearance was used on the earlier 40 horse rocker assemblies and on the sodium valves used in the '74 Type 4 engines.
Colin _________________ www.itinerant-air-cooled.com |
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static Samba Member
Joined: March 22, 2002 Posts: 1830 Location: The High Desert
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Posted: Wed May 17, 2017 7:34 am Post subject: Re: Correct valve clearance? |
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Amskeptic wrote: |
So, the .006" clearance specification was born to give the engines a chance.
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"Loud tappets save lives." |
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roadron Samba Member
Joined: October 15, 2004 Posts: 215 Location: taos new mexico
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Posted: Wed May 17, 2017 10:48 am Post subject: Re: Correct valve clearance? |
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[quote="Amskeptic"]
roadron wrote: |
my 73 1700 owners manual actually calls for .004 and that's what I use. my valves rarely go out of adjustment and when they do they go a little loose. go figure ! |
No it doesn't.
Colin .... just checked and it is a manual printed by KAMPERS in England so not factory manual. they do specify .004 and that is what I've been using _________________ 73 WESTY SO72-6 with continental bed |
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