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914World.com _ 914World Garage _ Is This Going To Be A Problem
Posted by: kconway Jun 3 2008, 07:25 PM
I'm changing out the pushrod tubes and seals and found this. Do I need to replace this valve?
Kev
Posted by: BarberDave Jun 3 2008, 07:33 PM
Absolutely...... YES......... Dave 
Posted by: Phoenix 914-6GT Jun 3 2008, 07:34 PM
Yes. You want it to be a nice smooth flat surface.
Posted by: BarberDave Jun 3 2008, 07:38 PM
\
All of them ........ Dave
Posted by: SLITS Jun 3 2008, 07:39 PM
To save the valve, you could have the tip machined flat and use a lash cap.
Posted by: BarberDave Jun 3 2008, 07:44 PM
I would throw away all of them and the rockers, change just 1 and next week
others will go. Matter of fact I would have a good head shop ,( Len's ) rebuild
them. Dave
Posted by: BarberDave Jun 3 2008, 07:48 PM
SLIT"S Wouldn' t machineing the valve remove the heat treat makeing it to
soft even for a lash cup to last very long? Dave
Posted by: kconway Jun 3 2008, 07:49 PM
Can someone explain to me what the likely cause is. Car ran fine. Need a cheaper solution to rebuilding the entire head and pretty sure I'm not the guy to do it. Can I take the whole head to RIMCO or do they just do the machining?
Just like peeling an onion...
Posted by: ericread Jun 3 2008, 08:56 PM
Nah, You can buff that out. 
Posted by: SLITS Jun 3 2008, 09:14 PM
SLIT"S Wouldn' t machineing the valve remove the heat treat makeing it to
soft even for a lash cup to last very long? Dave
The lash cap is hardened and fits over the tip of the valve. The hardened surface takes the sliding of the rocker tip otherwise the rocker tip would "dig" into the malable surface and "mushroom" the stem tip.
Didn't say it was the way to go, but it is one way.
Posted by: Headrage Jun 3 2008, 10:53 PM
Can I take the whole head to RIMCO
Yes
Posted by: brer Jun 3 2008, 11:17 PM
You can get it done right here in san diego. Better than RIMCO by a mile.
Around 600+/- for the pair, if no welding. Thats a rebuild.
Posted by: kconway Jun 3 2008, 11:20 PM
You can get it done right here in san diego. Better than RIMCO by a mile.
Around 600+/- for the pair, if no welding. Thats a rebuild.
You saying they would replace all the valves, springs, rockers in both heads for ~$600? Whats the place your speaking of?
Posted by: sean_v8_914 Jun 3 2008, 11:21 PM
if the engine is assembled and still in the car...and you don't want to drop it all, put lash caps on all 4 valves and drive it till she spits chunks
Posted by: kconway Jun 3 2008, 11:22 PM
if the engine is assembled and still in the car...and you don't want to drop it all, put lash caps on all 4 valves and drive it till she spits chunks
Its out on an engine stand.
Posted by: brer Jun 3 2008, 11:49 PM
You can get it done right here in san diego. Better than RIMCO by a mile.
Around 600+/- for the pair, if no welding. Thats a rebuild.
You saying they would replace all the valves, springs, rockers in both heads for ~$600? Whats the place your speaking of?
don bolton
Bugpatch 619-449-8670
thats just ballpark, you would have to talk to him about what NEW parts you want, and how bad your heads are of course.
Posted by: Jake Raby Jun 3 2008, 11:54 PM
Brer,
I never knew that was the "don" you were referring to...
As far as that valve, well its a classic example of a valve that was ran loose for many miles... A lash cap is a band aid...
Posted by: HAM Inc Jun 4 2008, 08:09 AM
Yep, loose valve adjustment, and or poor oil. Swivel screws would have prevented this problem, and the excessive guide wear that usually accompanies tip wear.
If you want to stretch the service interval, the lash caps will serve as a sutiable band aid. Make sure you replace the valve adjusters at that time, and you will almost certainly need to shim the rockers to account for the lash caps, unless your adjusters are wound in to deal with cam wear.
Posted by: brer Jun 4 2008, 10:49 AM
Brer,
I never knew that was the "don" you were referring to...
As far as that valve, well its a classic example of a valve that was ran loose for many miles... A lash cap is a band aid...
He's a great guy Jake.
Honest as they come.
Posted by: sean_v8_914 Jun 4 2008, 11:24 AM
yup, bandaids have their place. I'm a "do it right" kind of guy but i look at cost-benefit. I would prefer a rebuilt head but the banbaid might get you down the road happy for another year.
Posted by: kconway Jun 4 2008, 08:55 PM
Pulled the head off the one side...both exhaust valves stems are damaged the one photo above is the worst of it. Intake valve stems look okay.
I appologize if this is boring or remedial but I've never been in an engine this far before. Does anything look way abnormal in these photos? This is cylinders 1 & 2.
Kev
Posted by: (*)(*) Jun 4 2008, 10:34 PM
Dude, you need to pull the valves, look for damage to the stems and seats. Not a job for the newbie....
You have the heads off, best to take it to or ship them to reputable AIR cooled head shop....
You're in So Cal....RIMCO.
http://www.rimcovw.com/
Posted by: (*)(*) Jun 6 2008, 09:41 AM
Dude, you need to pull the valves, look for damage to the stems and seats. Not a job for the newbie....
You have the heads off, best to take it to or ship them to reputable AIR cooled head shop....
You're in So Cal....RIMCO.
http://www.rimcovw.com/
Hmm, based on some follow-up posts, don't use RIMCO....my bad...
It's been awhile...geez, 15 years since I used them.
Posted by: brer Jun 6 2008, 10:22 AM
RIMCO will not be here long anyway.
fixtures and machines are for sale, $460,000 i hear.
Property will be sold off for development.
bye RIMCO
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