L20b valve adjustment bolt

[Jayroc]

I did my valves today and my #1 intake doesn't seem right. The bolt is threaded out 1/2" more than the rest of my intakes.

Bad picture I know.

Does anyone know the max the adjustment bolt can be out.

It turns over fine when I crank it with no noise. It's set at 0.008 cold.

 

Also my compression is low in the number 1 cylinder 130ish the rest are 150ish

[russaroll]

http://community.ratsun.net/topic/35475-valve-cleance-on-l20b/

 

 

 

http://community.ratsun.net/topic/16539-l-series-valve-adjustment/

[Jayroc]

I read those earlier and no info about the adjustment bolt has a max it can be backed out.  thanks though

[Jayroc]

With my other 7 adjustments they were just a couple thou.  This one was at least 1/4" gap before i adjusted it.

[banzai510(hainz)]

only thing I cant think that might have happen is the valve lash fell out and you had to adjust the post up to make the difference.

 

I would watch this as that post being so far up I would wonder if the rocker is being worn in the center or running off the rocker arm , then it would ruin the cam lobe. Check the cam lobe for scarring wear

 

 

I wonder if the valve seat is crocked and not letting the valve move farther up

[datzenmike]

Probably lash pad but seat may have fallen out too and the valve won't close.

[Jayroc]

Not the boost of confidence I was looking for. 

 

Lobs seemed fine but I'll give them another once over for sure.

 

Guess I'm pulling the head then.

 

Fingers crossed the seat is just crocked

[Doctor510]

Not the boost of confidence I was looking for. 

 

Lobs seemed fine but I'll give them another once over for sure.

 

Guess I'm pulling the head then.

 

Fingers crossed the seat is just crocked

Probably a bent valve, broken guide or dropped seat. Not sure what a crocked seat is.  Bit the bullet and pull the head.

[banzai510(hainz)]

like I said if the lash pad is in the valve spring retainer then something is preventing the valve to fully seat .  If you could have photo of theother side with lash pad. but I think the rocker wear would be towards one side if not off the wear pad on the rocker

[datzenmike]

Don't pull your head.

 

You should have one of these in the top of the valve stem and just under the end of the rocker arm. If missing that's your problem.

 

[Jayroc]

Doctor,     I meant crooked valve seat

Banzai,   The pad is in the spring retainer, that I checked

Mike,       What are those?

[datzenmike]

Those are the lash pad that banzai mentioned. They can pop off if the lash is too wide and the engine reved up. If missing it's likely laying near the valve springs. Can't go anywhere.

 

 

[banzai510(hainz)]

those are the lash pads that the rocker arm sits on.

 

so to say yes to my ? number 2 means you dont need to ask Mike what are those. Otherwise we have a failure to communicate.

[datzenmike]

 

Take that rocker arm off and look at the contact area. If it's worn or gouged that would also require the adjustment to be let out. This one below, is totaled....

 

 

 

Should look like the top one below...

 

 

What oil are you using?????

[Jayroc]

10-30 castor

 

It's the lash pad that's missing. Now to find it in the am

[Jayroc]

I was confused about the lash pad in my previous post.

[datzenmike]

It's ok.

 

That great news! It's possible it got past the cam sprocket and is down in the pan but have a good look around.

[Jayroc]

Trucks been sitting 20years maybe that's why they parked it

[datzenmike]

Maybe the valve stuck on the first turn over and the lash pad stuck to the rocker and then fell off. Be great if you find it just laying there.

[banzai510(hainz)]

really it would have been running on 3 cylinders . YOu never mentioned this on the history of this so we have to assume it was running ok. and adjusting the valve you should have noticed this unless it was already done this way then you came along.

 

People might have spare lash  if you need one. 

 

 

hopefully you haven't ran this too long this way

[Jayroc]

I though I did post the history guess not . Maybe 2 minutes of run time before the adjustment. 0 after, because it didn't look right and my gut said something was off.

 

I have a spare 210 peanut head I can pull one off if need be. Not a fan of extra parts floating around in an engine though.

[wayno]

There is a screen down there to keep it from getting sucked up, but it is likely still up at the top, you just have not looked in the right place yet.

[banzai510(hainz)]

usually the pad is near by . the previous owner ran it awhile it might Have made it to the oil pan but it no big deal. Just pull one out of another head. This should take care of the issue and youll dial the post back down.

 

I screw  post down  far as i can down then I use a screwdriver. pu the rocker on the lash pad then I pry the rocker up on the ball end then adjust the lash and lock it down

[datzenmike]

If in the oil pan, that is the safest place if lost. They don't float and will stay on the bottom.

[Jayroc]

So I found it today right beside one of the head bolts. So backed down the adjuster, pulled the rocker out. No damage to the rocker, lash pad, or cam. Small mark on the bottom of the the rocker where it contacted the spring retainer. The spring retainer had some deeper gouges. The lash pad still moved freely, but I still took a small file to take the sharpness off the damage. You can just see it to the left of the rocker.