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Question ???????

  1. #1
    Senior Member Deweydaddy's Avatar
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    My newly purchased truck came with some new parts.......Cam, Beehive Springs, Roller rockers........I'm changing the springs on the heads on the motor...in the truck.......All rockers are off (old ones). Adding air to cyl to keep valves up that I'm working on.....Of course, gotta keep plugs in or air will rotate engine.....Question.....can I damage the engine when It did spin some, while all valves were closed? Wasn't a fast spin, but it cant be good?????? Will it pinch a ring???? Also I did rotate by hand too (with plugs in)slowly to make sure piston was up in the cyl so valve cant drop into hole.....I pretty much gotta keep 6-7plugs in or it will spin with air about 50 psi.........thanks

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by Deweydaddy View Post
    My newly purchased truck came with some new parts.......Cam, Beehive Springs, Roller rockers........I'm changing the springs on the heads on the motor...in the truck.......All rockers are off (old ones). Adding air to cyl to keep valves up that I'm working on.....Of course, gotta keep plugs in or air will rotate engine.....Question.....can I damage the engine when It did spin some, while all valves were closed? Wasn't a fast spin, but it cant be good?????? Will it pinch a ring???? Also I did rotate by hand too (with plugs in)slowly to make sure piston was up in the cyl so valve cant drop into hole.....I pretty much gotta keep 6-7plugs in or it will spin with air about 50 psi.........thanks
    Wont hurt anything. Be very careful though, if you were to accidentally leave a breakover bar attached to the balancer to rotate it over with and then apply pressure to a cylinder it can spin over with enough force to tear something/someone up with that breakover. Ask me how I know.
    "if we keep doing it the same way we always do..we will always get the same results"
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    Senior Member Deweydaddy's Avatar
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    Quote Originally Posted by Hass828 View Post
    Wont hurt anything. Be very careful though, if you were to accidentally leave a breakover bar attached to the balancer to rotate it over with and then apply pressure to a cylinder it can spin over with enough force to tear something/someone up with that breakover. Ask me how I know.
    Thats a relief to know.......It spun a few times easily with no plugs......pressure went out the holes.....then I added plugs....and it still spun a few revs...added more plugs and it stopped spinning.....you can hear the pressure when it spun.....must be through the rings.....Thanks and yes....1/2 socket did spin off crank......Wont do that again!!!!!!!

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by Deweydaddy View Post
    Thats a relief to know.......It spun a few times easily with no plugs......pressure went out the holes.....then I added plugs....and it still spun a few revs...added more plugs and it stopped spinning.....you can hear the pressure when it spun.....must be through the rings.....Thanks and yes....1/2 socket did spin off crank......Wont do that again!!!!!!!
    Yes. And I hate to tell this tale on myself but maybe it will keep someone from getting hurt.
    When I do a leak down check I like to do it with each cylinder at top dead center of the firing stroke. If you start with # 1 then you turn the crank 90* at a time and go through the firing order. Well, I got into a bad habit of leaving the breakover attached to the front of the engine and applying pressure to a cylinder. Well it must have not been at exact TDC, it rotated over with enough force to put a dent in the stringer. Would have killed someone(me) if it had hit them.
    I think god gives us a little thump on the noggin once in a while as a warning to slow down and watch what your doing.
    Last edited by Hass828; 11-27-2012 at 04:55 AM.
    "if we keep doing it the same way we always do..we will always get the same results"
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    Senior Member Deweydaddy's Avatar
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    Quote Originally Posted by Hass828 View Post
    Yes. And I hate to tell this tale on myself but maybe it will keep someone from getting hurt.
    When I do a leak down check I like to do it with each cylinder at top dead center of the firing stroke. If you start with # 1 then you turn the crank 90* at a time and go through the firing order. Well, I got into a bad habit of leaving the breakover attached to the front of the engine and applying pressure to a cylinder. Well it must have not been at exact TDC, it rotated over with enough force to put a dent in the stringer. Would have killed someone(me) if it had hit them.
    I think god gives us a little thump on the noggin once in a while as a warning to slow down and watch what your doing.
    Yes, Things happen quick good and bad.....It spun a 1/2" breakerbar with a 19mm socket on it like it was nothing.......and I was more worried about all that pressure in the plugged holes where it was going........then I started rotating it by hand with plugs in it.........just got me thinking about all the dead heading pressure and possible damage I could be doing to the rings..........I have 10 more springs and retainers to do.....Thanks again..

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    just a ski boat with bark Carnivalride's Avatar
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    Dewey,

    That won't hurt anything in fact that's basically how you have to do it. I typically just work one side at a time like 2, 4, 6 & 8 first and then jump over to 1, 3, 5 & 7. With a cold engine in air pressure or vacuum will leak past the rings. When you put 100psi to a cylinder to hold your valves up it's going to drive the piston in that cylinder to its BDC. Which doesn't hurt anything unless you lose air pressure and drop a valve. I use small zip ties around the valve stems to hold the valves up and do the entire side at one time.

    Loren
    Quote Originally Posted by gn7 View Post
    Carnivalride, you really need to find some other hobby. You have no talent for this boat thing

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    Senior Member hellnback's Avatar
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    Quote Originally Posted by Carnivalride View Post
    Dewey,

    That won't hurt anything in fact that's basically how you have to do it. I typically just work one side at a time like 2, 4, 6 & 8 first and then jump over to 1, 3, 5 & 7. With a cold engine in air pressure or vacuum will leak past the rings. When you put 100psi to a cylinder to hold your valves up it's going to drive the piston in that cylinder to its BDC. Which doesn't hurt anything unless you lose air pressure and drop a valve. I use small zip ties around the valve stems to hold the valves up and do the entire side at one time.

    Loren
    also the way I do mine !! nice tip too
    It may be OLD ,it may be Slow ... but at least it's MOBILE !!!

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    Senior Member Deweydaddy's Avatar
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    Thanks guys, think I over analyze possibly too much at times......

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