Type 1 push rod (fell?) off rocker arm

[westysmb]

I did a compression test and found zero compression in #2 cylinder. When I went to adjust the valves to see if it would help with the issue, this is what I found.

Any thoughts on what I should do/how to approach this?

I'm not sure if I can just put the push rod back on the rocker arm or if I'm going to have to remove the push rod, check if its bend (which it probably is), pull the whole head, etc.

This is on a type 1 1641 dual port.
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1970 Westfalia with a late Sportsmobile top

[busdaddy]

Well step 1 is find out why that happened, is the valve still compressed?, does the pushrod move out when you turn the engine to the intake stroke for that cylinder?, did a nut or something go down the intake and jam the valve allowing it to hop out? is the valve sticking in the guide?
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[hazetguy]

remove the rocker shaft and see if the valve moves back out. my thought is that it will not. i'm thinking (as mentioned) that the valve is siezed in the guide or that something is causing it to stick open. if that is the case, the head needs to come off for repairs or replacement.

if the valve does move back out, can you easily move that rocker arm on the shaft, or is the rocker am siezed to the shaft?

pull the push rod out for inspection, and also look at the push rod tube for holes/bends/damage.
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[westysmb]

[Tcash]

Take the Intake manifold off and take a look at the valve seat.

Dropped valve seat

Good luck
Tcash

[westysmb]

The valve didn't move out. The rocker arm moves freely.

I think the push rod looks pretty good and straight. The push rod tube looks good from the outside, but has some damage where the push rod was resting against it.

How easy is it to remove the head to see whats going on?

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1970 Westfalia with a late Sportsmobile top

[Tcash]

Easy with the engine out.
Hard with the engine in.

[SGKent]

roll the pushrod on a piece of glass, something no one will get upset about if you leave a scratch. That will tell you if it is bent and how badly.

Use a propane torch to warm up the head around the valve guide, not the spring itself - when I say warm meaning you can still touch it but not too hot. If the spring comes back out you can try some Carb spray on the valve stem FOLLOWED by a couple good squirts of oil - AFTER the torch is turned off. Usually what it means is that the guide is too tight, the spring too weak, and the guide or varnish /carbon has grabbed the valve. HOWEVER it can also mean that a seat has fallen out, or that a valve floated and hit a piston. If you are home I would probably pull the head and take it to a machine shop but this has happened to me once on a cold morning a very long time ago when camping, and it never came back because I ran some cleaner in the oil then changed it as soon as we got home. I did rebuild the heads as soon as I could however. In my case I left the pushrod off and started the engine and let it idle for a couple minutes to heat the head, and the spring popped out. If your head was warm already and the spring did not come out just take both the heads to the machine shop and have them checked.
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[Wildthings]

How old is the fuel in your tank? If it is more than a month old it can cause a gummy substance to build up on your valve stems and seize the stems in the valve guides. This unfortunately is a very common problem any more with cars that don't see enough use to burn through a tank of gas at least once a month.

[Clatter]

My bet is bent valve.
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What’s That Noise?!?

[westysmb]

[Tcash]

Ok imagine the valve opening and closing.

Right now the valve is stuck open.
So you need to look deeper in the hole at the valve.

[Q-Dog]

Is it an optical illusion or are there no washers under the head nuts?
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Brian

'69 Dune Buggy
'69 Beetle Convertible
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[richparker]

[busdaddy]

[Abscate]

You've seized a valve...time to drop that engine and start finding all the Charlie Foxtrots from the build. No one with any skills can put bolts onto case studs without washers unless they are clueless. They just go together.
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[hazetguy]

[hazetguy]

[Wildthings]

Spray some carb cleaner down in the intake port so it soaks the valve stem as well as possible. Once the cleaner sits for a while use a soft drift and a hammer and smartly tap the end of the valve stem a few times. With luck the valve will slam shut.

[airschooled]