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Correct valve clearance?
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70Crew
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PostPosted: Mon May 15, 2017 5:41 pm    Post subject: Correct valve clearance? Reply with quote

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.
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Randy in Maine
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PostPosted: Mon May 15, 2017 5:47 pm    Post subject: Re: Correct valve clearance? Reply with quote

0.006".

If you are new at this, it is nice to have a "go-no go" feeler gauge.

http://www.autozone.com/clamps-and-measuring-tools...e/1928_0_0
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70Crew
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PostPosted: Mon May 15, 2017 5:58 pm    Post subject: Re: Correct valve clearance? Reply with quote

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.
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PostPosted: Mon May 15, 2017 6:12 pm    Post subject: Re: Correct valve clearance? Reply with quote

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
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PostPosted: Mon May 15, 2017 6:23 pm    Post subject: Re: Correct valve clearance? Reply with quote

Thanks.... stock cam (or at least it was supposed to be).
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PostPosted: Mon May 15, 2017 7:42 pm    Post subject: Re: Correct valve clearance? Reply with quote

Waaay more likely to burn your valves, likely exhaust, at .004 than at .006. It runs cooler but clatters more at .006.
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PostPosted: Mon May 15, 2017 8:32 pm    Post subject: Re: Correct valve clearance? Reply with quote

I think the .004 was for sodium filled valves.
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PostPosted: Mon May 15, 2017 9:12 pm    Post subject: Re: Correct valve clearance? Reply with quote

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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PostPosted: Mon May 15, 2017 9:27 pm    Post subject: Re: Correct valve clearance? Reply with quote

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
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PostPosted: Mon May 15, 2017 9:30 pm    Post subject: Re: Correct valve clearance? Reply with quote

I do 0.006 on intake and 0.008 on exhaust on my 1800
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PostPosted: Mon May 15, 2017 9:36 pm    Post subject: Re: Correct valve clearance? Reply with quote

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...
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PostPosted: Tue May 16, 2017 7:41 am    Post subject: Re: Correct valve clearance? Reply with quote

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.
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otiswesty
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PostPosted: Tue May 16, 2017 2:48 pm    Post subject: Re: Correct valve clearance? Reply with quote

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.
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PostPosted: Tue May 16, 2017 4:07 pm    Post subject: Re: Correct valve clearance? Reply with quote

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
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PostPosted: Tue May 16, 2017 7:51 pm    Post subject: Re: Correct valve clearance? Reply with quote

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 !
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Last edited by roadron on Wed May 17, 2017 6:55 am; edited 2 times in total
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Wildthings
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PostPosted: Tue May 16, 2017 10:06 pm    Post subject: Re: Correct valve clearance? Reply with quote

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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PostPosted: Wed May 17, 2017 6:59 am    Post subject: Re: Correct valve clearance? Reply with quote

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 Razz
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Amskeptic
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PostPosted: Wed May 17, 2017 7:06 am    Post subject: Re: Correct valve clearance? Reply with quote

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
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static
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PostPosted: Wed May 17, 2017 7:34 am    Post subject: Re: Correct valve clearance? Reply with quote

Amskeptic wrote:

So, the .006" clearance specification was born to give the engines a chance.

"Loud tappets save lives."
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roadron
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PostPosted: Wed May 17, 2017 10:48 am    Post subject: Re: Correct valve clearance? Reply with quote

[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
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