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Schorsch84
Samba Member
Joined: February 16, 2015
Posts: 30
Location: Moorpark, California
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 Posted: Tue Mar 03, 2015 1:33 pm Post subject: |
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Okay, duly noted. If I do opt for new valves (which I likely will), can any of you recommend a quality valve at a reasonable price? Looking at an old thread (http://www.thesamba.com/vw/forum/archive/index.php/o-t--t-340631--.html), I got some recommendations, but again, the thread was old so the quality may be different today. What are some good, current options?
Thanks in advance,
Scott |
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32595
Location: Reading Pennsylvania
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vinziboy
Samba Member
Joined: October 22, 2013
Posts: 25
Location: Quebec, Canada
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| Posted: Mon Mar 23, 2015 1:20 pm Post subject: |
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| vinziboy wrote: |
On the side, anybody knows if I can reuse stock VW keepers instead of grinding the AMC ones down?
cheers, |
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vinziboy
Samba Member
Joined: October 22, 2013
Posts: 25
Location: Quebec, Canada
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tpinthepack
Samba Member
Joined: July 11, 2004
Posts: 816
Location: clearwater,florida
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| Posted: Fri Mar 27, 2015 5:39 pm Post subject: |
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Has anyone ever checked or tested the valve springs on these AMC heads? I wonder if they are too week to fully close the valves, and also press the lifter plunger back in the center bore of the lifter body still? Reason I ask is my valves took me a heck of a lot of tinkering to get perfect. I had the common issue of valves opening when you preload the 2 turns, and it would not run. I later backed them off to .006 and it ran like a champ with best gas mileage ever. I then put the preload back on by adjusting them to zero and adding 1/2 turn until I reached 1 1/2. I noticed when I backed off it had no pressure so it made me think the hydro lifters were working correct. But my gas mileage went back down. Bad. I then did a compression test had 155 of 3, and had 125 on another. Set that low cylinder to .006 lash and back to 155 on all 4 cylinders. I have 2200 miles on the AMC heads now. I am just wondering if the springs are weak, they let the lifter open the valve and prevent from closing all the way. That long term will burn a valve.
Just thinking out loud, but my van is running pretty sweet right now.
_________________
TP in the Pack (I am a cyclist)
1968 Manx N.O.S. w/ Barrett Chassis
1960 Single Cab 1914 w/ 40 DLRA's
1990 Vanagon DOKA
1972 Super Beetle
1979 Super Beetle Convertible
2011 Porsche Cayenne |
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fraggle00
Samba Member
Joined: October 19, 2011
Posts: 356
Location: Bristow, VA
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| Posted: Sun Jul 26, 2015 1:45 pm Post subject: |
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how are your lifters? When I pulled my motor apart, I figured mine would be find with some cleaning but I found every one air bound and a little squishy. After tearing them all down, cleaning them and bench bleeding them per bently, they're all rock hard. We'll see if they bleed down on the bench - they're going to be there for a bit as I clean up the case, but if not, I think I'm going to be pretty happy going forward.
I'll add here that I also tore down my new AMC heads, did a light grind on all the seats/valves and worked over the keepers to remove a little slop. We'll see how they go!
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'91 Vanagon Carat
'87 Porsche 928S4 DOWN
'12 Fiat 500 Abarth |
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pablovent
Samba Member
Joined: July 14, 2010
Posts: 900
Location: Chile
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| Posted: Wed Aug 05, 2015 9:52 am Post subject: |
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| Finally the problem is exhaust valves or soft valve seats??....in my type4 AMC heads buyed in evwspart after 15,000 miles valves look good, but the seats are deeper !! |
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jalan
Samba Member
Joined: December 11, 2009
Posts: 75
Location: Underwood, Washington
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| Posted: Fri Apr 21, 2017 8:13 am Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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Here is a photo to demonstrate why you want to replace the exhaust valves on AMC heads. The stock AMC valves on the heads I just rebuilt were ready to come apart. Notice how the valve has worn away where it rotates in the valve keepers. The other valve is the intake which for some reason didn't wear like the exhaust.
VW designed the valves to spin within the keepers. You will note the rocker hits the stem off center in order to cause this spin. I believe the valve lifters are also designed to spin in order to spread the wear over the whole surface.
Go Westy and other builders replace the stock AMC valves on new heads for good reason. They are junk!!
Both AE and TRW are reported to be good valves.
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1989 Syncro Hardtop, 2.5 '07 Subaru
1991 Carat Hardtop
1995 High Top Eurovan Syncro |
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tpinthepack
Samba Member
Joined: July 11, 2004
Posts: 816
Location: clearwater,florida
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| Posted: Sat May 13, 2017 2:57 am Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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Over 2 years on my AMC heads and right at 30k miles with no issues. I have not pulled the valve keep off to inspect but I have no symptoms or power issues. I am going to inspect the best I can by just pulling valve covers.
_________________
TP in the Pack (I am a cyclist)
1968 Manx N.O.S. w/ Barrett Chassis
1960 Single Cab 1914 w/ 40 DLRA's
1990 Vanagon DOKA
1972 Super Beetle
1979 Super Beetle Convertible
2011 Porsche Cayenne |
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stevey88
Samba Member
Joined: January 16, 2008
Posts: 1317
Location: Fremont, SF Bay Area
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| Posted: Sat May 13, 2017 8:48 am Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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jalan,
Your valve head looks like this because the valve keepers that came with the AMC head have a problem. There should be gaps between the two keepers once installed but the keepers that came with the head is too big. Look at the two installed keepers, if both sides of the keepers touch each other the valve head is not making correct contact with the keepers so the keeper is hammering the valve head. Only one side of the keeper should be able to touch the other keeper. Either new keepers should be used or the existing keepers should be grind down. Search the samba for photos.
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Steve
87 Westfalia full camper 4 speed |
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stevey88
Samba Member
Joined: January 16, 2008
Posts: 1317
Location: Fremont, SF Bay Area
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| Posted: Sat May 13, 2017 9:13 am Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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The keeper gap should look like this
[/img]
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Steve
87 Westfalia full camper 4 speed |
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Zeitgeist 13
Samba Member
Joined: March 05, 2009
Posts: 12115
Location: Port Manteau
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| Posted: Sat May 13, 2017 11:01 am Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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Last year ECS Tuning had an insanely hot deal on brand new complete AMC cylinder heads for the ALH, so I bought one as a spare for my van, but I'm wondering if I should tear it down and replace the valves and keepers. Does anyone know whether the valve issues are found on all their heads?
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Casey--
'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik? |
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jalan
Samba Member
Joined: December 11, 2009
Posts: 75
Location: Underwood, Washington
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| Posted: Mon Dec 17, 2018 10:51 am Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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I just had another set of AMC heads rebuilt and this time the exhaust valves were in even worse condition. Sure glad I didn't wait another few thousand miles.
I notice that Rocky of RJE still doesn't trust the stock AMC exhaust valves.
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1989 Syncro Hardtop, 2.5 '07 Subaru
1991 Carat Hardtop
1995 High Top Eurovan Syncro |
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Wasted youth
Samba Member
Joined: July 06, 2012
Posts: 5134
Location: California's Hot and Smoggy Central Valley
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| Posted: Mon Dec 17, 2018 3:07 pm Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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| jalan wrote: |
I just had another set of AMC heads rebuilt and this time the exhaust valves were in even worse condition. Sure glad I didn't wait another few thousand miles.
I notice that Rocky of RJE still doesn't trust the stock AMC exhaust valves. |
These are wasserboxer heads, right?
Can you verify the condition of the keeper problems outlined by stevey88? |
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DanHoug
Samba Member
Joined: December 05, 2016
Posts: 4777
Location: Bemidji, MN
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| Posted: Mon Dec 17, 2018 3:17 pm Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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i've got a thread going on my #4 exhaust valve leaking on my 2016 AMC head. i'll be tearing it apart at some point here. GoWesty reportedly changed the valves when they resell the heads. it'll be interesting to see what i find.
_________________
-dan
60% of what you find on the internet is wrong, including this post.
'87 Westy & '89 Westy both 2.1 4spd
Past projects can be found at--
www.thefixitworkshop.com |
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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Mon Dec 17, 2018 4:17 pm Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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| DanHoug wrote: |
| i've got a thread going on my #4 exhaust valve leaking on my 2016 AMC head. i'll be tearing it apart at some point here. GoWesty reportedly changed the valves when they resell the heads. it'll be interesting to see what i find. |
Just curious, how did you diagnose the thread is going? Leak down test or visual inspection? Ive got 2014 amc heads (stock) with a little over 20k on them and knock on wood, all seems well |
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DanHoug
Samba Member
Joined: December 05, 2016
Posts: 4777
Location: Bemidji, MN
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tencentlife
Samba Member
Joined: May 02, 2006
Posts: 10078
Location: Abiquiu, NM, USA
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| Posted: Tue Dec 18, 2018 1:22 pm Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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If you want to jump past the usual disinformation about AMC wbx heads, I have a new blog post going over the common questions:
https://intrepidoverland.com/amc-wbx-cylinder-heads/
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Experience is kryptonite to doctrine. |
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DanHoug
Samba Member
Joined: December 05, 2016
Posts: 4777
Location: Bemidji, MN
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| Posted: Tue Dec 18, 2018 1:34 pm Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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nice. as always, thanks for the great info.
_________________
-dan
60% of what you find on the internet is wrong, including this post.
'87 Westy & '89 Westy both 2.1 4spd
Past projects can be found at--
www.thefixitworkshop.com |
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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Tue Dec 18, 2018 3:37 pm Post subject: Re: AMC Heads 2015, replace exhaust valves?? |
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This answers a lot of my questions, thanks 10cent! |
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