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 Rocker arm adjustment method
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loosetappet
Sitting Bull

113 Posts

Posted - 30 Aug 2016 :  08:40:57 AM  Show Profile  Reply with Quote
Somewhere on this site Bill has posted the procedure for rocker arm adjustment. Elsewhere on the web I found an adjustment method on the Wallace racing site. Here is my question- Which one is easier (better)? The Wallace site is a little baffling because they start out (like Bill) with #1 at TDC but they don't adjust either of the #1 rockers at that position. Am I missing something here? Why wouldn't you do the #1 rockers when you are already at TDC of the compression stroke?

Blued and Painted
Chief PONTIAC

USA
3406 Posts

Posted - 30 Aug 2016 :  10:14:21 AM  Show Profile  Reply with Quote
EDIT
Do you have a harmonic balancer marked every 90 degrees?

Is this a running engine or on a stand?

Per pontiac assembly instructions, cam and crank gear dots are both set at 12 o'clock on assembly. Both dots Straight up. In this position, #6 is at TDC of the compression stroke. #1 is at TDC at the end of the exhaust stroke and valves are overlapping (both valves open). If the gear dots are lined up together at 6 and 12 o'clock, you are on #1 TDC compression stroke. That should answer your question.
If the distributor is correctly installed, you can simply adjust both valves on the cylinder the rotor is pointing too.
My procedure.. While turning the engine, plugs out, find the overlapping pair of valves (predictable), then adjust both valves of the opposite cylinder in the firing order. 1-6, 8-5, 4-7, and 3-2. So if #1 valves are overlapping, then adjust cylinder #6. and so on.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.

Edited by - Blued and Painted on 30 Aug 2016 10:58:42 AM
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Tub
Sitting Bull

172 Posts

Posted - 30 Aug 2016 :  1:06:10 PM  Show Profile  Reply with Quote
"...cam and crank gear dots are both set at 12 o'clock on assembly. Both dots Straight up. In this position, #6 is at TDC of the compression stroke. #1 is at TDC at the end of the exhaust stroke and valves are overlapping (both valves open). If the gear dots are lined up together at 6 and 12 o'clock, you are on #1 TDC compression stroke..."


That sounds exactly backwards to me. Both dots @ 12 puts #1 at TDC of compression stroke--NOT #6.

http://psp.aquacomp.net/topic.asp?TOPIC_ID=4083

http://www.hotrodders.com/forum/installed-pontiac-350-timing-gears-wrong-221799.html

Edited by - Tub on 30 Aug 2016 1:10:43 PM
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loosetappet
Sitting Bull

113 Posts

Posted - 30 Aug 2016 :  1:47:45 PM  Show Profile  Reply with Quote
Yes, it's a running engine in the car. I don't know if the cam was installed correctly. The #1 terminal is on the driver's side, and the #6 opposite. Runs good. I am just upgrading to an adjustable valve train (new cam in the future).

Look at the Wallace instructions-

http://www.wallaceracing.com/valvelash.htm

I'm sure they are correct, but why not do #1 first when it is already at TDC of the compression stroke? Or am I having a "DOH!" moment? LOL
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Admin
Ye Olde Webmaster

848 Posts

Posted - 30 Aug 2016 :  3:18:24 PM  Show Profile  Reply with Quote
http://www.pontiacstreetperformance.com/psp/rockers.html

This procedure works.

"Dedicated to keeping the classic Pontiac engine alive."

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loosetappet
Sitting Bull

113 Posts

Posted - 30 Aug 2016 :  5:36:50 PM  Show Profile  Reply with Quote
quote:
Originally posted by Admin

http://www.pontiacstreetperformance.com/psp/rockers.html

This procedure works.



Thanks. Will finish it tonight.
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Tub
Sitting Bull

172 Posts

Posted - 30 Aug 2016 :  5:50:24 PM  Show Profile  Reply with Quote
"...but why not do #1 first when it is already at TDC of the compression stroke?..."


Yes, you can do it that way, and then go right on thru the firing order. I don't know why people wanna make it sound so complicated.

If your balancer is not marked, make some marks at 90 degree intervals. That way, when you rotate the crank to the next 90 degree mark, you can adjust the valves on the next cyl in the firing order.

Once you make 2 complete revolutions, your thru. The crank is easy to turn, with a torque wrench.

I did it this way countless times. Always worked for me. I'll repeat that you should ALWAYS turn the nut a little more AFTER you tighten the lock screw. This will prevent the nut from backing off. I learned this the hard way. So, after that, I have always tightened the lock screw when the nut is just short of my desired final position, then turn the nut a little more. This will cause the bottom of the lock screw to dig into the top of the stud, making it much harder for the nut to back off.
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Pontiac Dude
Sitting Bull

USA
199 Posts

Posted - 01 Sep 2016 :  09:12:06 AM  Show Profile  Visit Pontiac Dude's Homepage  Reply with Quote
Have been setting rockers since the 70's this way. Never have to go back over them. The K.I.S.S. method. LOL.
One cylinder and bank at a time.
When the exhaust valve just opens..... adjust the intake.
When intake valve is halfway closed..... adjust the exhaust.
Don't re-set as the plunger can preload and screw up your settings. If u do then take them all loose and crank over with plugs out a couple of times and start from scratch .

Zero lash plus 1/2 turn. 3/4 turn with hyd rollers. Solids as specified.

## 1976 T/A, Hydraulic roller, 3460lbs, stock suspension & Pump gas. N/A: 9.78@136 ##

I Specialize in ALL American Muscle Iron.
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loosetappet
Sitting Bull

113 Posts

Posted - 04 Sep 2016 :  2:28:33 PM  Show Profile  Reply with Quote
quote:
Originally posted by Admin

http://www.pontiacstreetperformance.com/psp/rockers.html

This procedure works.



Well written and easy to understand. And thanks to all the other replies. After many years I have gotten back to Pontiacs, learning that I have forgotten most of what little I did know.

Edited by - loosetappet on 04 Sep 2016 10:48:37 PM
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