Any machinists set valves on an DOHC motor? - Page 2

George Mirza · 04-07-2011, 09:46 PM

Art,
To convert the MM feeler gauges to standard just multiply by .03937.

1mm x .03937= .03937
.5mm x .03937= .01968

Terry Cain · 04-09-2011, 08:14 AM

Quote:

Originally Posted by art leong

I have been looking at my solid lash adjusters. And there is no room to get a feeler gauge inbetween the valve and the rocker (the rocker has a channel that rides on the valve)

I can measure the distance between the cam and the roller on the rocker.

The only way I can adjust them is to do it one cylinder at a time (2 intakes or 2 exhausts)
Then pull the cam and adjusters lock the locknuts, then recheck them. Then move on to another pair of valves
Any ideas on an easier way to do it?

Art,
I'd cut the adjuster boss down to where you can get a wrench on the adjuster in there real easy or if this is a super stock motor I'd weld the adjuster to the rocker and make the pad that the rocker sits on stationary. (as long as there's room for cam/cams

Adger Smith · 04-09-2011, 09:35 AM

Art,
What is the actual Rocker Ratio? You know,measured... Measure the lobe lift and then the valve lift @ "0" lash. Then divide the required lash, at the valve tip, by the RR and set at the roller.
You do realize with a set up like that you can alter the RR with tip length of the valve. It can also move the cam timing around a little.

Rich Biebel · 04-09-2011, 05:02 PM

Get a pair(1 Int and 1 ex) set at the valve to whatever lash you want and then see what it is between the cam and the roller. A feeler gauge should work ......Once you know the number that is at the cam/roller with the proper lash at the valve tip..... set them all at the cam/roller contact area. They do make very thin open end wrenches once know as tappet wrenches that might work on the adjusters...

I agree that motorcycle engine mechanics would have tools to do this....My son has been around motorcycles all his life......

I also think Terry's idea of cutting the bosses down is a very good one......Not real hard to do it either.....

art leong · 04-09-2011, 05:22 PM

I'm thinking of cutting the bosses down some Fabricating a wrench that I can use on there. Possibly drilling holes for set screws to stop the lifter from turning.
But this will probably be for next season.

Mark Yacavone · 04-09-2011, 09:12 PM

Never mind . It looks like you don't have any room to close up the adjuster height any.
Yep. Machine the bosses down when you get the head off.

quickford1 · 04-10-2011, 01:36 PM

Art
Rich is correct about the tappet wrenches, Sears sells them.They are about .250 thick.
Rich

04-07-2011, 09:46 PM	#11
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Re: Any machinists set valves on an DOHC motor? Art, To convert the MM feeler gauges to standard just multiply by .03937. 1mm x .03937= .03937 .5mm x .03937= .01968

04-09-2011, 09:35 AM	#13
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Any machinists set valves on an DOHC motor? Art, What is the actual Rocker Ratio? You know,measured... Measure the lobe lift and then the valve lift @ "0" lash. Then divide the required lash, at the valve tip, by the RR and set at the roller. You do realize with a set up like that you can alter the RR with tip length of the valve. It can also move the cam timing around a little. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 04-09-2011 at 09:42 AM.

04-09-2011, 05:02 PM	#14
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,314 Likes: 25 Liked 544 Times in 213 Posts	Re: Any machinists set valves on an DOHC motor? Get a pair(1 Int and 1 ex) set at the valve to whatever lash you want and then see what it is between the cam and the roller. A feeler gauge should work ......Once you know the number that is at the cam/roller with the proper lash at the valve tip..... set them all at the cam/roller contact area. They do make very thin open end wrenches once know as tappet wrenches that might work on the adjusters... I agree that motorcycle engine mechanics would have tools to do this....My son has been around motorcycles all his life...... I also think Terry's idea of cutting the bosses down is a very good one......Not real hard to do it either..... __________________ Rich Biebel S/C 1479 Stock 147R Last edited by Rich Biebel; 04-09-2011 at 05:06 PM.

04-09-2011, 05:22 PM	#15
art leong VIP Member Join Date: Dec 2001 Location: Richmond Hill, Georgia Posts: 2,003 Likes: 0 Liked 1 Time in 1 Post	Re: Any machinists set valves on an DOHC motor? I'm thinking of cutting the bosses down some Fabricating a wrench that I can use on there. Possibly drilling holes for set screws to stop the lifter from turning. But this will probably be for next season. __________________ Art Leong 2095 SS

04-09-2011, 09:12 PM	#16
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,807 Likes: 2,897 Liked 5,109 Times in 1,947 Posts	Re: Any machinists set valves on an DOHC motor? Never mind . It looks like you don't have any room to close up the adjuster height any. Yep. Machine the bosses down when you get the head off. __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers Last edited by Mark Yacavone; 04-10-2011 at 04:02 AM.

04-10-2011, 01:36 PM	#17
quickford1 Member Join Date: Aug 2008 Location: Davidson, NC Posts: 269 Likes: 522 Liked 20 Times in 12 Posts	Re: Any machinists set valves on an DOHC motor? Art Rich is correct about the tappet wrenches, Sears sells them.They are about .250 thick. Rich