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#45
by
rabbitman
on 31 Jan, 2012 14:25
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I have one here that is collapsed on my computer table and it is real close to 1/2", no where near 3/4
Is that measured or "eyeballed"?
If that's the case then I have lifters for something else, aren't gasser lifters really similar if not identical to a diesel lifter?
I'd love to only have to buy new lifters.
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#46
by
rabbitman
on 31 Jan, 2012 14:46
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Well maybe ALL of my lifters have issues and are stuck partway open.
According to my quick research, gas and diesel lifters are the same........
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#47
by
rabbitman
on 31 Jan, 2012 16:05
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So I used hook jawed vise grips and squeezed a lifter for a while and it did flatted more, and if appears there's a spring inside the lifter.
After flattening it all the way I put it in a lifter bore, put the cam in and pushed it down, now I can feel the spring squish without opening the valve.
With the cam holding the lifter down I can push the lifter down and feel the spring squish a little more so I don't think I'm outside the lifters working range.
Now what happens when I put it all back together and start it will this problem repeat itself?
Lucas, I'll get a new measurement with a lifter that's "really" flattened.
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#48
by
rabbitman
on 31 Jan, 2012 18:48
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All exhaust valves are just BARELY in spec but only one intake valve is in spec, the rest are pretty far out.
That would explain why it seemed to fire on one cylinder all the time.
I'm now in the market for a "new" head.
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#49
by
smutts
on 01 Feb, 2012 19:09
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#50
by
theman53
on 01 Feb, 2012 21:22
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That was measured. Maybe close to 5/8
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#51
by
rabbitman
on 01 Feb, 2012 21:29
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That was measured. Maybe close to 5/8
Ok, looks like my lifters weren't the problem, once I left them squished for a while they got a lot shorter than previously measured.
My issue is definitely caused by the seats being ground too far into the head and putting the lifter at its shortest while still holding some valves open.
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#52
by
smutts
on 04 Feb, 2012 08:45
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If you have an aftermarket camshaft, check the basecircle is 38mm....ish. Before you rip the guts out of the engine.
A mate had a three day swearfest before he found the replacement camshaft had been wrongly dimensioned by the VERY reputable makers.
Don't take anything for granted.
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#53
by
rabbitman
on 04 Feb, 2012 18:52
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Just measured at slightly LESS than 37mm. This is a hydro engine so the cam is a bit different than solid.
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#54
by
rabbitman
on 08 Feb, 2012 14:25
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Not sure what's going on any more. I totally flattened the lifters (though some are still being stubborn about it) and put in one lifter at a time, bolted the cam down and I can compress the little spring inside the lifter without opening the valve. So it would appear I don't really have a problem other than lifters that were pumping up too far.
I'm currently soaking all of the lifters in some toxic chemicals to try and loosen whatever is keep a few from wanting the bleed down. There are about 3 that I can squeeze over night and they'll flatten but as soon as I let up on 'em they don't want to squeeze all the way down again. The rest seem to be totally empty.
That minimum VC surface to stem tip measurement in the book may be not the limit but probably leaves enough room for valve wear over the years.
My plan is to empty all the lifters and put it all back together and see what happens. I have a HG on the way in case I find that I do have to grind the stems shorter.
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#55
by
R.O.R-2.0
on 10 Feb, 2012 13:22
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Not sure what's going on any more. I totally flattened the lifters (though some are still being stubborn about it) and put in one lifter at a time, bolted the cam down and I can compress the little spring inside the lifter without opening the valve. So it would appear I don't really have a problem other than lifters that were pumping up too far.
I'm currently soaking all of the lifters in some toxic chemicals to try and loosen whatever is keep a few from wanting the bleed down. There are about 3 that I can squeeze over night and they'll flatten but as soon as I let up on 'em they don't want to squeeze all the way down again. The rest seem to be totally empty.
That minimum VC surface to stem tip measurement in the book may be not the limit but probably leaves enough room for valve wear over the years.
My plan is to empty all the lifters and put it all back together and see what happens. I have a HG on the way in case I find that I do have to grind the stems shorter.
have you checked for a stuck oil pressure check valve?
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#56
by
rabbitman
on 10 Feb, 2012 14:16
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Check valve in the lifter or you mean the relief valve in the oil pump? Oil pressure is lower than I like so that can't be the issue. I got the lifters working good now, I think they had something gunked in there and weren't bleeding down.
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#57
by
R.O.R-2.0
on 10 Feb, 2012 14:35
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Check valve in the lifter or you mean the relief valve in the oil pump? Oil pressure is lower than I like so that can't be the issue. I got the lifters working good now, I think they had something gunked in there and weren't bleeding down.
didnt you REPLACE the lifters tho?
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#58
by
rabbitman
on 10 Feb, 2012 16:00
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didnt you REPLACE the lifters tho?
No, I didn't think it would be worth it if these were still fixable, which they were I guess they seem to be working fine........
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#59
by
R.O.R-2.0
on 10 Feb, 2012 16:06
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didnt you REPLACE the lifters tho?
No, I didn't think it would be worth it if these were still fixable, which they were I guess they seem to be working fine........
i have a set of lifters out of an AAZ that crashed.. and those lifters function as new, but that doesnt mean i would ever consider running them..