Adjusting Lashing on RR's

cyberstang5.0 · 08-19-2002, 08:11 AM

I just installed studded 1.6RR and I need to adjust the lashing on them. In detail, explain how to do it..... Thanks.

95mustanggt · 08-19-2002, 08:16 AM

I think PKRWUD, explained in great detail on a past thread. I have the whole thing saved on my home PC. If you do a search you'll find it though....

WADS56 · 08-19-2002, 08:17 AM

1. Make sure that the lifter is riding on the heal of the cam
2. Hand tighten the the rocker down while turning the pushrod back and forth until the pushrod won't turn.
3. give the rocker nut 1/2 turn then lock it down. (sets the preload.)

Eric4Nitrous · 08-19-2002, 09:08 AM

Wads couldn't have said it any better

PKRWUD · 08-19-2002, 09:55 AM

As far as your rockers, try it this way:

1) Install all 16, and snug down the nuts by hand.

2) Rotate the engine until the balancer reads TDC on the compression stroke.

3) Check the rotor in the distributor, and verify that it is pointing at the #1 wire on the cap. If it's not, rotate the engine 360 degrees.

4) With a 1/4" drive ratchet, tighten the following rockers until you can no longer rotate the pushrod:
Cylinder #1 intake and exhaust,
Cylinder #3 exhaust,
Cylinder #4 intake,
Cylinder #7 exhaust,
Cylinder #8 intake.

5) Now tighten each of those 3/4 of a turn.

6) Rotate the engine 360 degrees, so the balancer reads TDC again.

7) With a 1/4" ratchet, tighten these rockers (again, to zero lash):
Cylinder #3 intake,
Cylinder #2 exhaust,
Cylinder #7 intake,
Cylinder #6 exhaust.

8) Now tighten each of those 3/4 of a turn.

9) Rotate the engine 90 degrees, and with the ratchet, tighten to zero lash on these rockers:
Cylinder #2 intake
Cylinder #4 exhaust
Cylinder #5 intake and exhaust
Cylinder #6 intake
Cylinder #8 exhaust

10) Now tighten each of those 3/4 of a turn.

Take care,
~Chris

Jeff Chambers · 08-19-2002, 11:28 AM

I'd have to throw in this comment on the methods given above. To find the point of zero lash, spin the pushrod between your thumb and forefinger while slowly tightening the polylock. When you feel the first bit of drag on the spinning pushrod, stop tightening the polylock. This is the point of zero lash. Then set your desired preload from there, i.e. 1/2 turn, 3/4 turn or whatever you like to run. Ford recommends something like 0.040" to 0.060". On a 3/8-16UNC stud, one full turn is about 0.063". Some like to run it looser, some tighter. It all depends on how confident you are in your lifters and spring pressures.

To say "tighten until you can no longer rotate the pushrod" is wrong since that would imply that you've completely collasped the lifter and loaded the pushrod in compression.

PKRWUD · 08-19-2002, 12:19 PM

Quote:

Originally posted by jeff chambers

To say "tighten until you can no longer rotate the pushrod" is wrong since that would imply that you've completely collasped the lifter and loaded the pushrod in compression.

Good point. I will reword it for everyone. I wrote that thinking that those involved understood what I meant, but you are absolutely correct. My bad for assuming!

Take care,
~Chris

cyberstang5.0 · 08-19-2002, 12:31 PM

Thanks for all your help.... I understood what PKRWUD ment, but thanks for clearifying

I'll let yall know if I run into any problems

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08-19-2002, 08:11 AM	#1
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	Adjusting Lashing on RR's I just installed studded 1.6RR and I need to adjust the lashing on them. In detail, explain how to do it..... Thanks.

08-19-2002, 08:16 AM	#2
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	I think PKRWUD, explained in great detail on a past thread. I have the whole thing saved on my home PC. If you do a search you'll find it though.... __________________ 1995 Mustang GT 20016 F150 Lariat Super Crew

08-19-2002, 08:17 AM	#3
WADS56 gear banger Join Date: Aug 2000 Location: CHICAGO Posts: 1,144	1. Make sure that the lifter is riding on the heal of the cam 2. Hand tighten the the rocker down while turning the pushrod back and forth until the pushrod won't turn. 3. give the rocker nut 1/2 turn then lock it down. (sets the preload.) __________________ 79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor 93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe Ricer hater's club member #49

08-19-2002, 09:08 AM	#4
Eric4Nitrous Registered Member Join Date: Jan 2002 Location: Va Posts: 1,122	Wads couldn't have said it any better __________________ 68 Camaro Gene Fulton 632ci Two stages of Jug 8.41 164mph Rockingham 1-26-03

08-19-2002, 09:55 AM	#5
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	As far as your rockers, try it this way: 1) Install all 16, and snug down the nuts by hand. 2) Rotate the engine until the balancer reads TDC on the compression stroke. 3) Check the rotor in the distributor, and verify that it is pointing at the #1 wire on the cap. If it's not, rotate the engine 360 degrees. 4) With a 1/4" drive ratchet, tighten the following rockers until you can no longer rotate the pushrod: Cylinder #1 intake and exhaust, Cylinder #3 exhaust, Cylinder #4 intake, Cylinder #7 exhaust, Cylinder #8 intake. 5) Now tighten each of those 3/4 of a turn. 6) Rotate the engine 360 degrees, so the balancer reads TDC again. 7) With a 1/4" ratchet, tighten these rockers (again, to zero lash): Cylinder #3 intake, Cylinder #2 exhaust, Cylinder #7 intake, Cylinder #6 exhaust. 8) Now tighten each of those 3/4 of a turn. 9) Rotate the engine 90 degrees, and with the ratchet, tighten to zero lash on these rockers: Cylinder #2 intake Cylinder #4 exhaust Cylinder #5 intake and exhaust Cylinder #6 intake Cylinder #8 exhaust 10) Now tighten each of those 3/4 of a turn. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

08-19-2002, 11:28 AM	#6
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	I'd have to throw in this comment on the methods given above. To find the point of zero lash, spin the pushrod between your thumb and forefinger while slowly tightening the polylock. When you feel the first bit of drag on the spinning pushrod, stop tightening the polylock. This is the point of zero lash. Then set your desired preload from there, i.e. 1/2 turn, 3/4 turn or whatever you like to run. Ford recommends something like 0.040" to 0.060". On a 3/8-16UNC stud, one full turn is about 0.063". Some like to run it looser, some tighter. It all depends on how confident you are in your lifters and spring pressures. To say "tighten until you can no longer rotate the pushrod" is wrong since that would imply that you've completely collasped the lifter and loaded the pushrod in compression. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

08-19-2002, 12:31 PM	#8
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	Thanks for all your help.... I understood what PKRWUD ment, but thanks for clearifying I'll let yall know if I run into any problems