Valve Spring Removal W/ Head on - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

JayDM420 · 01-21-2015, 10:20 AM

So I've got a Redtop S13 Sr20det that I have been building to install in my S14.

I bought the Bc stage 2 cams and Bc valve springs kit. I have the motor un-installed for easy access but I would like to install the springs without removing the head if possible. When I searched around for a guide for doing this I came up with the nicoclub thread on How to build a 9000rpm Sr20det Head

http://www.nicoclub.com/archives/how...0det-head.html

I have the tool in the red box that bolts onto the head to remove the springs but the only info this guy gives on removal with the head on is this

"First, stuff a tower underneath the valves that you are working on so that the valves do not move. If you are doing this with the head still on the motor, you NEED to pressurize the combustion chamber so that the valves don’t fall down."

How exactly do I do this on a Sr? What kind of attatchment am I going to need for my air compressor/where can I buy it? Where do I stick it lol? Any info would awesome

Dboyizmlg · 01-21-2015, 10:28 AM

Just take the head off!

It's much easier, at least for me it is.

JayDM420 · 01-21-2015, 10:40 AM

It may be easier but it is certainly not cheaper lol

dbeiler · 01-21-2015, 11:05 AM

Compression gauges will usually come with a short hose extension. One end of the hose extension screws into the sparkplug hole, the other end has a pneumatic hose fitting.

pacotaco345 · 01-21-2015, 11:11 AM

I've had friends who had luck taking the spark plug out, threading string down in there when the piston is at BDC, then rotating the motor to TDC so that the string keeps the valves pushed up. Never tried it myself though

JayDM420 · 01-21-2015, 11:15 AM

Quote:

Originally Posted by dbeiler

Compression gauges will usually come with a short hose extension. One end of the hose extension screws into the sparkplug hole, the other end has a pneumatic hose fitting.

That almost seems to simple lol. Just connect em and flip the switch for the compressor? Should I get the cyclinder I'm working on to TDC before compressing the spring?

PPman · 01-21-2015, 11:21 AM

I did it on my ka with a air compressor, and a compression test hose from the cheap harbor freight kit. Putting the piston you are working on at TDC would be worth the extra safety, since your engine is out you should be able to get away with just that (TDC that is). Give it a try if you already have the compressor and fittings.

JayDM420 · 01-21-2015, 11:29 AM

Alright this doesn't seem nearly as complicated as I anticipated, thanks for the info guys I really appreciate it!

01-21-2015, 10:20 AM	#1
JayDM420 Join Date: Apr 2014 Location: California Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	Valve Spring Removal W/ Head on So I've got a Redtop S13 Sr20det that I have been building to install in my S14. I bought the Bc stage 2 cams and Bc valve springs kit. I have the motor un-installed for easy access but I would like to install the springs without removing the head if possible. When I searched around for a guide for doing this I came up with the nicoclub thread on How to build a 9000rpm Sr20det Head http://www.nicoclub.com/archives/how...0det-head.html I have the tool in the red box that bolts onto the head to remove the springs but the only info this guy gives on removal with the head on is this "First, stuff a tower underneath the valves that you are working on so that the valves do not move. If you are doing this with the head still on the motor, you NEED to pressurize the combustion chamber so that the valves don’t fall down." How exactly do I do this on a Sr? What kind of attatchment am I going to need for my air compressor/where can I buy it? Where do I stick it lol? Any info would awesome

01-21-2015, 11:11 AM	#5
pacotaco345 Zilvia FREAK! Join Date: Jan 2010 Location: SoCal/Ft Worth TX Age: 30 Posts: 1,563 Trader Rating: (5) Feedback Score: 5 reviews	I've had friends who had luck taking the spark plug out, threading string down in there when the piston is at BDC, then rotating the motor to TDC so that the string keeps the valves pushed up. Never tried it myself though __________________

01-21-2015, 10:28 AM	#2
Dboyizmlg Nissanaholic! Join Date: Aug 2011 Location: SoCal (I.E.), San Berdino, Colton, Redlands Posts: 1,675 Trader Rating: (18) Feedback Score: 18 reviews	Just take the head off! It's much easier, at least for me it is.

01-21-2015, 10:40 AM	#3
JayDM420 Join Date: Apr 2014 Location: California Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	It may be easier but it is certainly not cheaper lol

01-21-2015, 11:05 AM	#4
dbeiler Zilvia Junkie Join Date: Jun 2012 Location: Lancaster county, PA Age: 33 Posts: 465 Trader Rating: (4) Feedback Score: 4 reviews	Compression gauges will usually come with a short hose extension. One end of the hose extension screws into the sparkplug hole, the other end has a pneumatic hose fitting.

01-21-2015, 11:21 AM	#7
PPman Leaky Injector Join Date: Feb 2012 Location: Houston Posts: 57 Trader Rating: (0) Feedback Score: 0 reviews	I did it on my ka with a air compressor, and a compression test hose from the cheap harbor freight kit. Putting the piston you are working on at TDC would be worth the extra safety, since your engine is out you should be able to get away with just that (TDC that is). Give it a try if you already have the compressor and fittings.

01-21-2015, 11:29 AM	#8
JayDM420 Join Date: Apr 2014 Location: California Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	Alright this doesn't seem nearly as complicated as I anticipated, thanks for the info guys I really appreciate it!