gip63
Forum Regular
Posts: 257
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Post by gip63 on Feb 1, 2016 21:57:27 GMT -5
Anyone ever replace valve seals on a 440 without removing heads by using air pressure in the cylinder to hold the valve up? My question is does the piston need to be TDC on the valve being replaced each time I replace one or can piston be in any position?
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Post by Nacho-RT74 on Feb 2, 2016 0:48:10 GMT -5
never have done, but I think you don't need it.
HOWEVER, if you do, will be safe if valve accidentally fall out ( for whatever reason )... will be still available to take it out held by the piston
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Post by 71se3834v on Feb 4, 2016 21:50:19 GMT -5
I've done it on other engines. Yes piston should be at TDC to minimize the volume of air needed so your compressor can keep up. I have the valve spring compressing tool that works from the top. Seems to me if you don't use air you'll have a tough time keeping the valve stem exposed while you install the keeper. Maybe w/the mopar big blocks the valve won't fall far enough down because the piston sits higher. Last one I remember doing was a chevy late 70's low compression straight six.
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gip63
Forum Regular
Posts: 257
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Post by gip63 on Mar 6, 2016 23:04:04 GMT -5
Well I finished the valve seal project. I screwed the air fitting in spark plug hole and went to work, I didn't worry about position of piston. It held air better than I thought and valves stayed up with no problems. It's quiet a job but it doesn't smoke so it's worth the trouble.
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,150
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Post by DynoDave on Mar 7, 2016 7:53:09 GMT -5
Excellent! Thanks for letting us know it worked for you gip63.
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Post by 71se3834v on Mar 7, 2016 17:54:47 GMT -5
It's nice when you see results after some long, extensive work.
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Post by 1ol74charger4me on Mar 7, 2016 21:14:23 GMT -5
Thanks you for the encouragement to try this when I get the time. I am pretty sure it will help my 360 but had not found anybody that would say it was worth the time. Congrats!
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gip63
Forum Regular
Posts: 257
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Post by gip63 on Apr 15, 2016 20:05:43 GMT -5
By the way if anyone does change valve seals there are two kinds of tools you can use to compress springs, don't use pry bar get a spring compressor that looks kinda like a pulley remover.
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Post by brigond on Apr 16, 2016 11:46:08 GMT -5
Glad i dont need this but good to know which tool to use.
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DynoDave
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Motown Mopar-Wizard
Posts: 11,150
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Post by DynoDave on Apr 16, 2016 17:47:48 GMT -5
I would agree with gip63 on this. The bar style can work, but for in-car, the compressor type is a lot handier. Safer too, in my opinion.
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