Setting roller rockers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dean23 · 03-25-2003, 10:16 PM

CAn you set up rollers while the engine is running or is it not rtecommended. I have a set installed on my 350, i set them up at zero lash plus 1/4 of a turn to start with.

*Randy70C-10* · 03-25-2003, 10:38 PM

I go one halve of a turn, but a quarter should be fine. I've never tried adjusting them while the engine is running.

Dean23 · 03-25-2003, 10:40 PM

thanks randy, once i get my carb i might fire it on the stand just so I can here it run. It will be a while before my truck is road ready

junkyardjohn · 03-25-2003, 10:46 PM

I LIKE TO SET UP MY ROCKERS (BOTH TYPES, ROLLER & STAMPED) ON THE STAND, WHILE I'M BUILDING AN ENGINE & DON'T USUALLY HAVE TO READJUST THEM, BUT I HAVE ADJUSTED SEVERAL SETS( ROLLER TIPPED,FULCRUM ROLLER & OF COARSE STAMPED) IN THE TRUCK WITH THE MOTOR RUNNING.

JOHN

mikep · 03-25-2003, 11:07 PM

I dont like adjusting them with the motor running. Gets oil all over the place and stains the headers even when you use those clips which dont really fit roller rockers anyway . Plus with big cams and exhaust that doesnt quite do much besides take the edge off its hard to tell when they start ticking when you back the adjuster nuts off.

Dean23 · 03-25-2003, 11:12 PM

my cam is not overly big, 224 i and 234 e 465 lift on i and 488 on e. gonna get a geare drive next week cause i like how they sound. thanks for the help guys.

sam's 72 · 03-25-2003, 11:26 PM

So tell me in details how to adjust them with engine on the stand. When your talking about zero lash, what are you talking about? Is the piston up at TDC, both valves closed?
Sam

Dean23 · 03-25-2003, 11:30 PM

on the cran website they have a page telling you how to adjust them. watch the exhaust valve on the cyl you are adjusting when it just starts to open you set intake. i went until i had no more up and down movement of the pushrod, then 1/4 turn. then turn engine over til exhaust opens and closes and then intake is just about closed and set the ehaust valve.

Stroker · 03-25-2003, 11:53 PM

Dean thats exactly the way I adjust the valvetrain for the very reasons mikep cited. It's also a good idea to check the geometery and all the valvetrain clearances while you at it.

bigjimzlll · 03-26-2003, 12:22 AM

I cut the top off an old valve cover..keeps the oil from flying all over..

crazy longhorn · 03-26-2003, 10:33 AM

I set mine running, & use a "windowed" set of stock covers as BigJim mentioned. As long as the eng is idling, the oil stays where it belongs.......buzz the throttle, & that SB will oil the garage wall tho! good luck,crazyL

*Randy70C-10* · 03-26-2003, 11:13 AM

Quote:

Originally posted by sam's 72
So tell me in details how to adjust them with engine on the stand. When your talking about zero lash, what are you talking about? Is the piston up at TDC, both valves closed?
Sam

Zero lash is when you are at TDC (compression stroke) both valves are closed and you have tightened the rocker just enough so that there is no up or down movement of the rocker. Another cool way to find zero lash is to spin the pushrod with your fingers while tightening the rocker nut. As soon as you start to feel some tension, you are at zero lash.

mikep · 03-26-2003, 11:44 AM

The TDC method doesnt work well with long duration cams. The one outlined on the crane cams website works a lot better.

*Randy70C-10* · 03-26-2003, 11:49 AM

That's why I have a bench grinder.

j/k

03-25-2003, 10:16 PM	#1
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	Setting roller rockers CAn you set up rollers while the engine is running or is it not rtecommended. I have a set installed on my 350, i set them up at zero lash plus 1/4 of a turn to start with. __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

03-25-2003, 10:40 PM	#3
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	thanks randy, once i get my carb i might fire it on the stand just so I can here it run. It will be a while before my truck is road ready __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

03-25-2003, 10:46 PM	#4
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,425	I LIKE TO SET UP MY ROCKERS (BOTH TYPES, ROLLER & STAMPED) ON THE STAND, WHILE I'M BUILDING AN ENGINE & DON'T USUALLY HAVE TO READJUST THEM, BUT I HAVE ADJUSTED SEVERAL SETS( ROLLER TIPPED,FULCRUM ROLLER & OF COARSE STAMPED) IN THE TRUCK WITH THE MOTOR RUNNING. JOHN __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

03-25-2003, 11:07 PM	#5
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	I dont like adjusting them with the motor running. Gets oil all over the place and stains the headers even when you use those clips which dont really fit roller rockers anyway . Plus with big cams and exhaust that doesnt quite do much besides take the edge off its hard to tell when they start ticking when you back the adjuster nuts off. __________________ No truck :-(

03-25-2003, 11:12 PM	#6
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	my cam is not overly big, 224 i and 234 e 465 lift on i and 488 on e. gonna get a geare drive next week cause i like how they sound. thanks for the help guys. __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

03-25-2003, 10:38 PM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	I go one halve of a turn, but a quarter should be fine. I've never tried adjusting them while the engine is running.

03-25-2003, 11:26 PM	#7
sam's 72 Senior Member Join Date: Nov 2001 Location: Pasadena, Texas, USA Posts: 1,005	So tell me in details how to adjust them with engine on the stand. When your talking about zero lash, what are you talking about? Is the piston up at TDC, both valves closed? Sam __________________ 72 LWB chevy truck. Pasadena, Texas

03-25-2003, 11:30 PM	#8
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	on the cran website they have a page telling you how to adjust them. watch the exhaust valve on the cyl you are adjusting when it just starts to open you set intake. i went until i had no more up and down movement of the pushrod, then 1/4 turn. then turn engine over til exhaust opens and closes and then intake is just about closed and set the ehaust valve. __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

03-25-2003, 11:53 PM	#9
Stroker Registered User Join Date: Mar 2001 Location: Moore, Ok Posts: 1,149	Dean thats exactly the way I adjust the valvetrain for the very reasons mikep cited. It's also a good idea to check the geometery and all the valvetrain clearances while you at it. __________________ 72 SWB parts and pieces Oklahoma

03-26-2003, 12:22 AM	#10
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	I cut the top off an old valve cover..keeps the oil from flying all over.. __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

03-26-2003, 10:33 AM	#11
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I set mine running, & use a "windowed" set of stock covers as BigJim mentioned. As long as the eng is idling, the oil stays where it belongs.......buzz the throttle, & that SB will oil the garage wall tho! good luck,crazyL

03-26-2003, 11:44 AM	#13
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	The TDC method doesnt work well with long duration cams. The one outlined on the crane cams website works a lot better. __________________ No truck :-(

03-26-2003, 11:49 AM	#14
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	That's why I have a bench grinder. j/k

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