pushrod length checking

Mr. Red Pony · August 28th, 2011, 05:14 PM

When I set the checker to the length they machine shop said it would be and tighten the rocker down, the valve compresses a little. Is this suppose to happen? I can put the stock PR in there with the rocker tight and I can wiggle just a hair, so I know its too short.

So how do I check the length properly?

mustangmike! · August 28th, 2011, 06:21 PM

buy a PR length checker, put it to stock length. Stick it in there. expand.

Mr. Red Pony · August 28th, 2011, 06:54 PM

Originally Posted by mustangmike!

buy a PR length checker, put it to stock length. Stick it in there. expand.

Expand until what?

mustangmike! · August 28th, 2011, 06:58 PM

until the checker is the correct length ?

Mr. Red Pony · August 28th, 2011, 07:48 PM

Originally Posted by mustangmike!

until the checker is the correct length ?

No shit. When is it the right length. Do you put preload on it?

Tang Stang · August 29th, 2011, 01:21 PM

Use a pushrod length checker to find the length for zero lash, then add .020-.060". That length will provide proper lifter preload.

mustangmike! · August 29th, 2011, 02:46 PM

always wondered, are the instructions on that for new lifter, or used ones with pressure still inside them ?

Tang Stang · August 29th, 2011, 02:49 PM

As long as the lifters are in good condition, it doesn't matter if they are new or used. The spring inside the lifter will hold the plunger at the top of the bore so that you can find zero lash.

mustangmike! · August 29th, 2011, 02:51 PM

Hell I Set them at 0lash and ordered those lol

southfour! · August 29th, 2011, 04:11 PM

Step 1: Take a Sharpie and make the top of the valve black
Step 2: Adjust the PR checker to stock height
Step 3: Check valve lash with PR checker at stock height
Step 4: Turn the PR checker making it longer until you get zero lash
Step 5: turn over the motor 2 times with the pr checker in place and the rocker torqued down
Step 6: Take off the rocker and see where it made a mark on the valve stem, you want to make it as close to the center of the valve, if its is not in the center adjust the PR checkers height up or down as needed.

That is how i did it more or less i hope it helps a little bit

Oh and do it on cylinder 1 starting when it is at TDC

This was my first time doing anything with the motor and it took a good 2 hours doing this to make sure i got it exactly right.

Mr. Red Pony · August 29th, 2011, 10:07 PM

Well my concern is that I set the checker to stock, tighten the rocker. And I only get MAYBE 1/4 a turn..

xtreme 2 · August 30th, 2011, 06:08 AM

Interesting info. Will be doing my cam soon, and this is a question I had. I need to find a local place to get pushrods in stock so I am not down a week waiting on them to come in.

August 28th, 2011, 05:14 PM	#1
Mr. Red Pony Resident badass 01 Built V6 (3.9) 13.91 @ 99.1 N/A Join Date: Jan 2010 Location: Lawton, Oklahomo Posts: 6,789 iTrader: 10 reviews	pushrod length checking When I set the checker to the length they machine shop said it would be and tighten the rocker down, the valve compresses a little. Is this suppose to happen? I can put the stock PR in there with the rocker tight and I can wiggle just a hair, so I know its too short. So how do I check the length properly? __________________ 271rwhp N/A V6 The Name is Danny. I'm a GM Technician. Suck it.

August 28th, 2011, 06:21 PM	#2
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	buy a PR length checker, put it to stock length. Stick it in there. expand. __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

August 28th, 2011, 06:58 PM	#4
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	until the checker is the correct length ? __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

August 29th, 2011, 01:21 PM	#6
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,961 iTrader: 2 reviews	Use a pushrod length checker to find the length for zero lash, then add .020-.060". That length will provide proper lifter preload. __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

August 29th, 2011, 02:46 PM	#7
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	always wondered, are the instructions on that for new lifter, or used ones with pressure still inside them ? __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

August 29th, 2011, 02:49 PM	#8
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,961 iTrader: 2 reviews	As long as the lifters are in good condition, it doesn't matter if they are new or used. The spring inside the lifter will hold the plunger at the top of the bore so that you can find zero lash. __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

August 29th, 2011, 02:51 PM	#9
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	Hell I Set them at 0lash and ordered those lol __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

August 29th, 2011, 04:11 PM	#10
southfour! Not Banned 2000 Mustang V6 2000 Silverado 1500 Join Date: Jan 2010 Location: Calgary, Canada Posts: 4,550 iTrader: 3 reviews	Step 1: Take a Sharpie and make the top of the valve black Step 2: Adjust the PR checker to stock height Step 3: Check valve lash with PR checker at stock height Step 4: Turn the PR checker making it longer until you get zero lash Step 5: turn over the motor 2 times with the pr checker in place and the rocker torqued down Step 6: Take off the rocker and see where it made a mark on the valve stem, you want to make it as close to the center of the valve, if its is not in the center adjust the PR checkers height up or down as needed. That is how i did it more or less i hope it helps a little bit Oh and do it on cylinder 1 starting when it is at TDC This was my first time doing anything with the motor and it took a good 2 hours doing this to make sure i got it exactly right. __________________ H/C/I V6 BMC Member: 12521 Cam Video My Build Thread

August 29th, 2011, 10:07 PM	#11
Mr. Red Pony Resident badass 01 Built V6 (3.9) 13.91 @ 99.1 N/A Join Date: Jan 2010 Location: Lawton, Oklahomo Posts: 6,789 iTrader: 10 reviews	Well my concern is that I set the checker to stock, tighten the rocker. And I only get MAYBE 1/4 a turn.. __________________ 271rwhp N/A V6 The Name is Danny. I'm a GM Technician. Suck it.

August 30th, 2011, 06:08 AM	#12
xtreme 2 Hardcore Enthusiast 2001 v6 premium Join Date: Nov 2008 Location: Tulsa, OK Posts: 1,340 Blog Entries: 1 iTrader: 0 reviews	Interesting info. Will be doing my cam soon, and this is a question I had. I need to find a local place to get pushrods in stock so I am not down a week waiting on them to come in.

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