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06-24-2009, 05:22 AM #1
keeping the valves up in a spring swap
When replacing valve springs, did most of you air compress the cylinders through the spark plug entrance? Was it really difficult to get to (or take the headers off)? Do you recommend the TDC method or any other? thanks.
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06-24-2009, 06:18 AM #2
- Join Date
- Jun 2007
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- Dalzell, Illinois
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- 36
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- 899
red with black stripes- 2002 Trans Am WS6
when i did mine i used the TDC method. i was going to use the air fiting, but couldnt get the hose in and tight in the spark plug hole.
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06-24-2009, 06:37 AM #3
I used the hose off of my compression tester and just hooked it up to my shop air line. it worked great and easy!
was a pain on one or two holes to get the threads started though
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06-24-2009, 07:30 AM #4
I compeletely forget what they are called but i planned on using those long things that you stick through the front of the engine. Someone help me out with the name ha
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06-24-2009, 07:48 AM #5
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06-24-2009, 08:03 AM #6
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06-24-2009, 08:41 AM #7
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06-24-2009, 08:50 AM #8
- Join Date
- Jan 2008
- Location
- Waco
- Posts
- 1,186
2005 Ram SRT-10 QC 8.3l- 1999 FRC Black
Alot of times god valve guides will not let it fall far, but who wants to chance it? Worn out valve guides and the bitch drops and you feel like you've been
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06-24-2009, 10:06 AM #9
all these warnings keep making me nervous lol, but i'll probably try using air compression and TDC method at the same time lol, be extra safe. You unbolted the headers to get to the plugs right? And the sticks you put in the front of the engine to keep the lifters up sounds pretty nice. Thunder has a set for $110. It seems like a lot, but is it worth it? Is the magnet method easy enough or any other?
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06-24-2009, 10:14 AM #10
wait, in archive Hi-Po wrote
"Go to home depot and buy to 5/16 wooden dowel rods and cut them to length you need. Some people are afraid to use a wood product inside thier engine. Your not forcing anything in there. Not like your going to pound these wooden dowels in with a 4 lb hammer. They slide in and slide out very easy and will cost you under 5 bucks. "
This sound good??
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06-24-2009, 10:25 AM #11
If you can't use an air compressor then do this...
Top dead center method
This method requires you to put the piston at the highest position in the bore, so that when you start to compress the spring, the valve can only drop until it hits the piston. When the piston is at top dead center, the valve can't move very far at all.
There are several ways to accomplish this:
A) You can place a small stick/rod/straw/something into the spark plug hole and have a buddy turn the crankshaft by putting the stock 24mm crank pulley bolt in and turning the bolt with a wrench. You should be able to feel when the piston comes up to the top.
B) This method is a bit more elegant. Rotate your motor over by hand until your cam gear and crank gear are dot to dot like you set them up as earlier. At this position, piston 1 and 6 should be at top dead center. You can change the 4 springs on these 2 cylinders now using the instructions below. After you change those 4, then, rotate the crankshaft a full 90 degrees, and the cam gear dot will turn 45 degrees, as if it is pointing to 7:30 if it were a clock. Now piston 8 and 5 are at the top and can be changed. Rotate another 90 degrees on the crank and your cam gear dot will now be at 9 o'clock. Piston 7 and 4 can now have their springs changed. And FINALLY, rotate the crank another 90 degrees and the cam gear dot will be at 10:30. You can now change your remaining four springs on piston 3 and 2.
Once again, that's 1 & 6, rotate 90, 8 & 5, rotate 90, 7 & 4, rotate 90, 3 & 2.
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06-24-2009, 10:39 AM #12
ls1howto.com.. very nice. haha, that's what I am going to refer to when i do this cam sway. Its pretty detailed, should be relatively smooth install
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06-24-2009, 01:15 PM #13
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06-24-2009, 02:11 PM #14
Yes, use the wooden dowels if replacing cam. Simple. Use shop air to hold valves up. There is a ebay dude that sells the hose and fitting for the spark plug for like 10 bucks shipped. Can probably make it yourself a tad cheaper, but thats what I bought.
Im going to be changing a few valve seals here in the next week or two. Im going to try and make a decent write up for around here. Seems to be alot of questions on this topic.
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07-21-2009, 06:56 PM #15
whats the deal with the wood dowels? where do they go n how do they hold up the lifters. swappin cam soon. thanks
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07-21-2009, 08:35 PM #16
- Join Date
- Jun 2007
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- Dalzell, Illinois
- Age
- 36
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- 899
red with black stripes- 2002 Trans Am WS6
when you get the timing chain off, spin the cam a couple times to knock the lifters up(rockers off of coarse). when you take the plate off that holds the cam in, you will see where the dowels go.
http://www.ls1.com/forums/showthread.php?t=103595Last edited by stephen02ws6; 07-21-2009 at 08:47 PM.
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07-22-2009, 03:00 PM #17
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07-22-2009, 05:59 PM #18
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