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Location:
Sydney
Registered:
January 2004
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Location:
Sydney
Registered:
January 2004
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Valve stem seals while head is on
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Wed, 24 March 2004 11:07
 
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the problem is keeping the valve up while you remove and install the valve springs... or more specifically the locks 
why not just pull the head off? you'll spend just as long stuffing around trying to do the seals with the head still on, and you can check more stuff with the head off. regrind the seats etc, do a bit of cleanign up...
sure you have to replace headgasket, but time and effort vs ease and a few more $$.... i know what i'd pick...
oh, and how do you plan to compress the springs?
Cya, Stewart
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Location:
Canberra
Registered:
May 2002
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Re: Valve stem seals while head is on
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Wed, 24 March 2004 11:27
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I've done it on my 4AGE, it is fiddly, took around 2 hours with 2 people (one to compress the valve springs while the other removed & refitted the locks)
You can use an air compressor with a fitting in the spark plug hole to keep the valves seated hard in the head. It wouldnt hurt to rotate each piston to TDC as you do each set of 4 valves as an extra precaution if your compressor decides to blow a hose or something (unlikely).
The valve springs aren't particularly hard, you can lean downwards on them with the engine in the car with a section of aluminium pipe (diameter similar to the top valve retainer)with a section cut out to access the two lock retainers with a strong magnet to remove them, then replace with a pair of angled tweezers (sp?). As I said, its fiddly, but after the first 4, you'll sail through the rest. 
But as oldcorollas said, its a good opportunity to take the head off and do some other beneficial work.
Cheers
Phil
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Valve stem seals while head is on
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Wed, 24 March 2004 11:41
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ooohhhh. i forgot its a twin cam (duh), so you'll have softer springs...
doing it with 80lb seat pressure springs is not fun (and 11mm compression = 240lbs)...
with the 4AG springs it should be easier.... do it with 2 ppl and prefereably somewhere easy to find the collet locks if they spring out!!!! they suck to find on grass....
Cya, Stewart
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Location:
Canberra
Registered:
May 2002
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Re: Valve stem seals while head is on
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Wed, 24 March 2004 11:49
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doing it with 80lb seat pressure springs is not fun (and 11mm compression = 240lbs)...
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You'd want to be a pretty top-heavy fella to do 16 of those in a row
Cheers
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Valve stem seals while head is on
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Wed, 24 March 2004 11:54
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LOL, even with special tooling i could barely do 1  bugger that for a joke ..
heh heh, you know that sound the lock makes when it richochets around the garage, closely followd by the valve springs?? uh huh.
Cya, Stewart
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Location:
Sydney
Registered:
January 2004
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Location:
Canberra
Registered:
May 2002
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Re: Valve stem seals while head is on
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Fri, 26 March 2004 05:27
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Good with my hands lol. What are you suggesting? 
Sorry, i may have been a bit misleading, it took 2 hours once my mate turned up, to remove & replace the 16 seals. I had already removed the cams before this stage, so add that to the time 
I didn't remove the crank pulley, as I wasn't changing the timing belt at the same time, it was only 5000km old. If you plan to change the timing belt, then yes, it would be a good idea to remove the crank pulley, otherwise just slacken off the belt adjuster, and slide the belt off the cam pulleys so that you can get the cams out.
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Location:
Sydney
Registered:
January 2004
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Re: Valve stem seals while head is on
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Mon, 29 March 2004 11:36
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I was being serious Phil, with a little joke behind it also  . Hope you don't get offended 
So did you not even slacken the belt adjuster when you did it? Were the locks hard to get out. Is your oil consumption a lot less now?
Thanks for the help,
Ben
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Location:
Sydney
Registered:
January 2004
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Re: Valve stem seals while head is on
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Tue, 30 March 2004 09:53
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Phil, you still around? anyone..
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Location:
Canberra
Registered:
May 2002
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Re: Valve stem seals while head is on
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Tue, 30 March 2004 12:58
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No offence taken
Yes, I had to slacken the belt adjuster to get the belt off the cams. The locks are easy to remove with a strong magnet (like the ones on the end of a radio antenna looking things, that you buy from auto parts stores for picking up metal parts) after compressing the valve spring. Replacing them is the fun part, its a bit fiddly, but easy to figure out after the first one or two.
Unfortunately it didnt fix my oil burning problem, I had mis-diagnosed it, as the problem was actually the placement of the oil drain from my turbo. Oh well, I guess it didnt hurt to replace them anyway.
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Location:
Sydney
Registered:
January 2004
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Re: Valve stem seals while head is on
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Wed, 31 March 2004 10:57
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Thats good didn't want to embarass you  ! Did you really just put pressure on the Al tube to compress the springs? Thought you would need proper compressor - however wouldn't think you'd have enough access..
Cheers
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Location:
Canberra
Registered:
May 2002
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Re: Valve stem seals while head is on
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Wed, 31 March 2004 13:50
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Yeah, seriously, you can lean on them hard enough to compress far enough to release the locking collars. The springs dont get hard to push until they are compressed more than 5mm or so. Its not the kind of thing you could do with one hand while removing the locks with the other though, you'd definately want someone to help.
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Location:
Sydney
Registered:
January 2004
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Re: Valve stem seals while head is on
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Sat, 03 April 2004 03:22
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I bought a cheap spare head (minus cams) from roadrunner to have a bit of a playaround first. Is it hard compressing the spings back to put the retainers and locks back in?
Thanks
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Registered:
August 2002
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Re: Valve stem seals while head is on
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Sat, 03 April 2004 05:00
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Valve spring compressor from auto1 = $50
Piece of scrap tube = free
Learning how to pull apart a head = priceless
I used the scrap tube to make an adapter for the fairly universal spring compressor to reach around the head.
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Location:
Sydney
Registered:
January 2004
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Re: Valve stem seals while head is on
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Sat, 03 April 2004 05:33
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Black supra - are you talking about a twin cam motor with direct acting cam lobes onto buckets..Phil, did you even need spring compressor at all?
Black Supra you were missing a picture in your last "priceless" post, maybe I could provide one of myself when I attempt pulling apart the head..with a valve stuck in my eye or something stupid (Shouldn't probably joke about that kind of thing )
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Registered:
August 2002
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Re: Valve stem seals while head is on
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Sat, 03 April 2004 06:03
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2JZGE
i assume its a fairly similar setup.
www.geocities.com/ifli4u/2jhead.jpg
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) ... 2h, that is bloody QUICK