SR20- Shims and Guides - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

DriftVader · 03-23-2011, 02:50 PM

okay so to make a long story short- I pulled my head off my motor when i shipped it from Japan to my current base. I at the time did not realize how important the shims and guides were and that they needed to be placed BACK to their oringal slots when i put the head back together. Question for you guys. Since when i put the motor back together, i measured as best i could and i had to "guesstimate" where the shims and guides went. My car has been running rich for the past few months and i cant figure out why. What kinda of problems would the shims and guides cause if they were put back in different slots?

thanks a bunch!

Str8silvias14 · 03-25-2011, 10:30 PM

I took my head off as well a while back and did th same I just put them where ever and my car ran like shit and in a matter of minutes my rockets broke 2 of my shims. As far as it running rich that just might be a minor tune issue. I took it to a shop and its been running well since.

japslapsilvia · 03-28-2011, 10:40 AM

Quote:

Originally Posted by DriftVader

okay so to make a long story short- I pulled my head off my motor when i shipped it from Japan to my current base. I at the time did not realize how important the shims and guides were and that they needed to be placed BACK to their oringal slots when i put the head back together. Question for you guys. Since when i put the motor back together, i measured as best i could and i had to "guesstimate" where the shims and guides went. My car has been running rich for the past few months and i cant figure out why. What kinda of problems would the shims and guides cause if they were put back in different slots?

thanks a bunch!

probably wont make a big difference, measure the thickness of all your shims, they are proabbaly all the same size, or well w/in a few thousands of each other, also measure the guides, ideally the guide and shim should make the rocker arm level. you can also source a valve tip height tool to check the tip height, which will ovbiously affect shim size. also IIRC all the guides are the same thickness.

Quote:

Originally Posted by Str8silvias14

I took my head off as well a while back and did th same I just put them where ever and my car ran like shit and in a matter of minutes my rockets broke 2 of my shims. As far as it running rich that just might be a minor tune issue. I took it to a shop and its been running well since.

i would really like to see how you broke a shim...a rocker arm very believable but a shim???

besTint · 03-28-2011, 11:01 PM

you have to check the rocker arm clearances so at this point you might as well get solid lifters cause your gonna have to go back and use a feeler gauge to make sure the rocker clearances are even with the cam lobes. HLA will screw you over down the line anyways so change em out now.

03-23-2011, 02:50 PM	#1
DriftVader Zilvia Junkie Join Date: Apr 2010 Location: Los Angeles, CA Age: 38 Posts: 382 Trader Rating: (2) Feedback Score: 2 reviews	SR20- Shims and Guides okay so to make a long story short- I pulled my head off my motor when i shipped it from Japan to my current base. I at the time did not realize how important the shims and guides were and that they needed to be placed BACK to their oringal slots when i put the head back together. Question for you guys. Since when i put the motor back together, i measured as best i could and i had to "guesstimate" where the shims and guides went. My car has been running rich for the past few months and i cant figure out why. What kinda of problems would the shims and guides cause if they were put back in different slots? thanks a bunch!

03-28-2011, 11:01 PM	#4
besTint Post Whore! Join Date: Mar 2008 Location: Stanton, CA Posts: 2,641 Trader Rating: (81) Rides Gallery: besTint Feedback Score: 81 reviews	you have to check the rocker arm clearances so at this point you might as well get solid lifters cause your gonna have to go back and use a feeler gauge to make sure the rocker clearances are even with the cam lobes. HLA will screw you over down the line anyways so change em out now. __________________ http://squarespokes.com/

03-25-2011, 10:30 PM	#2
Str8silvias14 Leaky Injector Join Date: Jan 2009 Location: Oceanside, CA Age: 35 Posts: 71 Trader Rating: (0) Feedback Score: 0 reviews	I took my head off as well a while back and did th same I just put them where ever and my car ran like shit and in a matter of minutes my rockets broke 2 of my shims. As far as it running rich that just might be a minor tune issue. I took it to a shop and its been running well since.