Author Topic: 72 350F valve adjustment when all tappets turned full loose  (Read 400 times)

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Offline Exbex1

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72 350F valve adjustment when all tappets turned full loose
« on: February 04, 2024, 07:04:08 AM »
Good morning all. I'm hoping for some validation here.
My rebuild is coming along nicely after splitting my case to fix a broken cam chain tensioner bolt.
I put the valve cover/ rocker assembly back on yesterday. I'm going to adjust valve clearances.
My issue is that all the tappets are set all the way out. That means all of them are loose.
Here's my question. You can still tell cam lobe position by how much they move right? The ones that move more would be the loose ones, correct?
If I'm sure of that, then I can adjust the valves correctly because I'll know if it’s the compression stroke or the exhaust stroke.

I'm I seeing this correctly?

Thank you.

Offline Bodi

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Re: 72 350F valve adjustment when all tappets turned full loose
« Reply #1 on: February 04, 2024, 01:35:51 PM »
Basics - that you probably know:
- have the plugs out or compression will fight you.
- you can only turn the crank forward if the starter is installed.
- turn the crank from the alternator, the tempting 17mm nut at the timing plate turns through delicate parts. OK if it's a gentle rotation forward but trying to fight compression or go reverse against the starter is likely to break NLA parts.

Just push a tappet against the cam and movement is obvious. I don't know/remember if valves are moved with the adjusters all the way out but I think so.

There's an adjustment order that minimizes crank turning. I don't use it, it doesn't save enough time and effort to be worthwhile for me.
I do cylinders in order. So watch the intake tappet in #1, when you see it closing turn the crank to T 1-4. Adjust both valves for #1. Then turn the crank one full turn to T 1-4 again and adjust intake and exhaust on #4
Same for #2, but it'll be the T 2-3 mark. Adjust in and ex for #2. Then turn the crank one full turn to T 2-3 again and adjust intake and exhaust on #3.

I do another round checking that the locknuts are good and tight and that the clearances are correct.

You can adjust exhaust during the intake stroke and intake during exhaust stroke but I prefer this way using TDC between compression and power strokes, do what works for you.

Offline Exbex1

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Re: 72 350F valve adjustment when all tappets turned full loose
« Reply #2 on: February 04, 2024, 02:36:27 PM »
Thank you very much. I got it this PM. They are very close. Maybe a little tiny bit loose, but thats better than too tight right?
All is well. Does the feeling in the pit of your stomach that you did something wrong ever go away? I'll know in a couple weeks when I start it.
Thank you for your time.
Tom

Offline bryanj

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Re: 72 350F valve adjustment when all tappets turned full loose
« Reply #3 on: February 04, 2024, 02:53:42 PM »
Too loose is not good, it will damage the valve tip and adjuster plus make you deaf.
It can be difficult for a novice to get a 2 or 3 thou gap but take time and make sure there is some clearance so not tight
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!